From: Viktor Szakats <commit@vsz.me>
Date: Sat, 7 Feb 2026 15:50:54 +0000 (+0100)
Subject: docs: compare `result` against literal `CURLE_OK` (where missing)
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02c37d269c94679915ca9233e49c5fe520c3a359;p=thirdparty%2Fcurl.git

docs: compare `result` against literal `CURLE_OK` (where missing)

Also scope to result variables.

Closes #20536
---

diff --git a/docs/examples/10-at-a-time.c b/docs/examples/10-at-a-time.c
index 6bc2bd71df..f04702f59b 100644
--- a/docs/examples/10-at-a-time.c
+++ b/docs/examples/10-at-a-time.c
@@ -107,7 +107,7 @@ int main(void)
   CURLM *multi;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   multi = curl_multi_init();
diff --git a/docs/examples/address-scope.c b/docs/examples/address-scope.c
index dba6c8f773..0cb9e0158d 100644
--- a/docs/examples/address-scope.c
+++ b/docs/examples/address-scope.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/altsvc.c b/docs/examples/altsvc.c
index bb813aa3f7..35fbc39a1a 100644
--- a/docs/examples/altsvc.c
+++ b/docs/examples/altsvc.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/anyauthput.c b/docs/examples/anyauthput.c
index a44194aaa5..9b08bbe41b 100644
--- a/docs/examples/anyauthput.c
+++ b/docs/examples/anyauthput.c
@@ -116,7 +116,7 @@ int main(int argc, const char **argv)
 
   /* In Windows, this inits the Winsock stuff */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fclose(fp);
     return (int)result;
   }
diff --git a/docs/examples/block_ip.c b/docs/examples/block_ip.c
index 6bf0625fdd..70a7b99f58 100644
--- a/docs/examples/block_ip.c
+++ b/docs/examples/block_ip.c
@@ -296,7 +296,7 @@ int main(void)
     return 1;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     free(filter);
     return (int)result;
   }
diff --git a/docs/examples/cacertinmem.c b/docs/examples/cacertinmem.c
index 2ede090a26..cd5013c30d 100644
--- a/docs/examples/cacertinmem.c
+++ b/docs/examples/cacertinmem.c
@@ -119,7 +119,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/certinfo.c b/docs/examples/certinfo.c
index 7dfa8e99c9..f9623281bb 100644
--- a/docs/examples/certinfo.c
+++ b/docs/examples/certinfo.c
@@ -42,7 +42,7 @@ int main(void)
   CURLcode result;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
@@ -59,7 +59,7 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       struct curl_certinfo *certinfo;
 
       result = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &certinfo);
diff --git a/docs/examples/chkspeed.c b/docs/examples/chkspeed.c
index a0c6fe1d3e..b29f803bbd 100644
--- a/docs/examples/chkspeed.c
+++ b/docs/examples/chkspeed.c
@@ -162,7 +162,7 @@ int main(int argc, const char *argv[])
 
   /* init libcurl */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* init the curl session */
diff --git a/docs/examples/connect-to.c b/docs/examples/connect-to.c
index d401fca662..706e9882a0 100644
--- a/docs/examples/connect-to.c
+++ b/docs/examples/connect-to.c
@@ -35,7 +35,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /*
diff --git a/docs/examples/cookie_interface.c b/docs/examples/cookie_interface.c
index e894f19665..aa3ea1d013 100644
--- a/docs/examples/cookie_interface.c
+++ b/docs/examples/cookie_interface.c
@@ -77,7 +77,7 @@ int main(void)
   CURLcode result;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/crawler.c b/docs/examples/crawler.c
index 2b199be116..915a7cae47 100644
--- a/docs/examples/crawler.c
+++ b/docs/examples/crawler.c
@@ -186,7 +186,7 @@ int main(void)
   CURLcode result;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   signal(SIGINT, sighandler);
diff --git a/docs/examples/debug.c b/docs/examples/debug.c
index 98457d53b2..44156cd823 100644
--- a/docs/examples/debug.c
+++ b/docs/examples/debug.c
@@ -125,7 +125,7 @@ int main(void)
   struct data config;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   config.trace_ascii = 1; /* enable ASCII tracing */
diff --git a/docs/examples/default-scheme.c b/docs/examples/default-scheme.c
index 821cad78c2..198c9c8041 100644
--- a/docs/examples/default-scheme.c
+++ b/docs/examples/default-scheme.c
@@ -35,7 +35,7 @@ int main(void)
   CURLcode result;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ephiperfifo.c b/docs/examples/ephiperfifo.c
index 5f9362b83e..1b5095a467 100644
--- a/docs/examples/ephiperfifo.c
+++ b/docs/examples/ephiperfifo.c
@@ -464,7 +464,7 @@ int main(void)
   struct epoll_event events[10];
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   g_should_exit_ = 0;
diff --git a/docs/examples/evhiperfifo.c b/docs/examples/evhiperfifo.c
index 565293d140..9799e5c067 100644
--- a/docs/examples/evhiperfifo.c
+++ b/docs/examples/evhiperfifo.c
@@ -413,7 +413,7 @@ int main(void)
   struct GlobalInfo g;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   memset(&g, 0, sizeof(g));
diff --git a/docs/examples/externalsocket.c b/docs/examples/externalsocket.c
index d1bdd732b9..959fbf7f11 100644
--- a/docs/examples/externalsocket.c
+++ b/docs/examples/externalsocket.c
@@ -104,7 +104,7 @@ int main(void)
   curl_socket_t sockfd;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
@@ -163,7 +163,7 @@ int main(void)
 
     close(sockfd);
 
-    if(result) {
+    if(result != CURLE_OK) {
       printf("libcurl error: %d\n", result);
       return 4;
     }
diff --git a/docs/examples/fileupload.c b/docs/examples/fileupload.c
index 82ebd878c7..f444da9b9e 100644
--- a/docs/examples/fileupload.c
+++ b/docs/examples/fileupload.c
@@ -54,7 +54,7 @@ int main(void)
   FILE *fd;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   fd = fopen("debugit", "rb"); /* open file to upload */
diff --git a/docs/examples/ftp-delete.c b/docs/examples/ftp-delete.c
index 9041baa380..5cc953e02d 100644
--- a/docs/examples/ftp-delete.c
+++ b/docs/examples/ftp-delete.c
@@ -43,7 +43,7 @@ int main(void)
   struct curl_slist *headerlist = NULL;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ftp-wildcard.c b/docs/examples/ftp-wildcard.c
index e8f0be6263..abde048e9d 100644
--- a/docs/examples/ftp-wildcard.c
+++ b/docs/examples/ftp-wildcard.c
@@ -107,7 +107,7 @@ int main(int argc, const char **argv)
 
   /* global initialization */
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* initialization of easy handle */
diff --git a/docs/examples/ftpget.c b/docs/examples/ftpget.c
index 15a7e22633..28b7a273c3 100644
--- a/docs/examples/ftpget.c
+++ b/docs/examples/ftpget.c
@@ -62,7 +62,7 @@ int main(void)
   };
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ftpgetinfo.c b/docs/examples/ftpgetinfo.c
index fd3fb90f57..ff2a8da084 100644
--- a/docs/examples/ftpgetinfo.c
+++ b/docs/examples/ftpgetinfo.c
@@ -56,7 +56,7 @@ int main(void)
   const char *filename = strrchr(ftpurl, '/') + 1;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ftpgetresp.c b/docs/examples/ftpgetresp.c
index c05f989f9a..8f888b470e 100644
--- a/docs/examples/ftpgetresp.c
+++ b/docs/examples/ftpgetresp.c
@@ -53,7 +53,7 @@ int main(void)
   FILE *respfile;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* local filename to store the file as */
diff --git a/docs/examples/ftpsget.c b/docs/examples/ftpsget.c
index 142d1fbcb7..b899d4caf5 100644
--- a/docs/examples/ftpsget.c
+++ b/docs/examples/ftpsget.c
@@ -62,7 +62,7 @@ int main(void)
   };
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ftpupload.c b/docs/examples/ftpupload.c
index 85b68da1bf..5b6ed7893e 100644
--- a/docs/examples/ftpupload.c
+++ b/docs/examples/ftpupload.c
@@ -107,7 +107,7 @@ int main(void)
 
   /* In Windows, this inits the Winsock stuff */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fclose(hd_src);
     return (int)result;
   }
diff --git a/docs/examples/ftpuploadresume.c b/docs/examples/ftpuploadresume.c
index 4908505ea1..c990622529 100644
--- a/docs/examples/ftpuploadresume.c
+++ b/docs/examples/ftpuploadresume.c
@@ -158,7 +158,7 @@ int main(void)
   CURL *curl = NULL;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/getinfo.c b/docs/examples/getinfo.c
index 811b0307c3..43a4eeb524 100644
--- a/docs/examples/getinfo.c
+++ b/docs/examples/getinfo.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/getinmemory.c b/docs/examples/getinmemory.c
index ea4da5dd9d..1743b203f5 100644
--- a/docs/examples/getinmemory.c
+++ b/docs/examples/getinmemory.c
@@ -65,7 +65,7 @@ int main(void)
   struct MemoryStruct chunk;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   chunk.memory = malloc(1); /* grown as needed by the realloc above */
diff --git a/docs/examples/getredirect.c b/docs/examples/getredirect.c
index 27c20ddb73..e144e628e4 100644
--- a/docs/examples/getredirect.c
+++ b/docs/examples/getredirect.c
@@ -35,7 +35,7 @@ int main(void)
   CURLcode result;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/getreferrer.c b/docs/examples/getreferrer.c
index cbe031763f..b2220842ec 100644
--- a/docs/examples/getreferrer.c
+++ b/docs/examples/getreferrer.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ghiper.c b/docs/examples/ghiper.c
index 522f69a054..7d79a973aa 100644
--- a/docs/examples/ghiper.c
+++ b/docs/examples/ghiper.c
@@ -432,7 +432,7 @@ int main(void)
   GIOChannel *ch;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   fd = init_fifo();
diff --git a/docs/examples/headerapi.c b/docs/examples/headerapi.c
index cbc60acc94..61f2eb98e8 100644
--- a/docs/examples/headerapi.c
+++ b/docs/examples/headerapi.c
@@ -42,7 +42,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/hiperfifo.c b/docs/examples/hiperfifo.c
index dccd4f6274..109addef76 100644
--- a/docs/examples/hiperfifo.c
+++ b/docs/examples/hiperfifo.c
@@ -422,7 +422,7 @@ int main(void)
   struct GlobalInfo g;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   memset(&g, 0, sizeof(g));
diff --git a/docs/examples/hsts-preload.c b/docs/examples/hsts-preload.c
index 8e73b79cda..877e8eb73e 100644
--- a/docs/examples/hsts-preload.c
+++ b/docs/examples/hsts-preload.c
@@ -92,7 +92,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/htmltidy.c b/docs/examples/htmltidy.c
index 7c11afbb2a..c73e5385e9 100644
--- a/docs/examples/htmltidy.c
+++ b/docs/examples/htmltidy.c
@@ -89,7 +89,7 @@ int main(int argc, const char **argv)
   }
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   tdoc = tidyCreate();
@@ -108,7 +108,7 @@ int main(int argc, const char **argv)
 
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &docbuf);
     result = curl_easy_perform(curl);
-    if(!result) {
+    if(result == CURLE_OK) {
       result = tidyParseBuffer(tdoc, &docbuf); /* parse the input */
       if(result >= 0) {
         result = tidyCleanAndRepair(tdoc); /* fix any problems */
diff --git a/docs/examples/htmltitle.cpp b/docs/examples/htmltitle.cpp
index ea62f93290..7986b94640 100644
--- a/docs/examples/htmltitle.cpp
+++ b/docs/examples/htmltitle.cpp
@@ -264,7 +264,7 @@ int main(int argc, const char *argv[])
   }
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   // Initialize CURL handle
diff --git a/docs/examples/http-options.c b/docs/examples/http-options.c
index 105f996436..16338441c7 100644
--- a/docs/examples/http-options.c
+++ b/docs/examples/http-options.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/http-post.c b/docs/examples/http-post.c
index dac8953b72..8f8be06748 100644
--- a/docs/examples/http-post.c
+++ b/docs/examples/http-post.c
@@ -36,7 +36,7 @@ int main(void)
 
   /* In Windows, this inits the Winsock stuff */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* get a curl handle */
diff --git a/docs/examples/http2-download.c b/docs/examples/http2-download.c
index 3e5dde1d2c..80c3365bb2 100644
--- a/docs/examples/http2-download.c
+++ b/docs/examples/http2-download.c
@@ -206,7 +206,7 @@ int main(int argc, const char **argv)
     num_transfers = 3; /* a suitable low default */
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   trans = calloc(num_transfers, sizeof(*trans));
diff --git a/docs/examples/http2-pushinmemory.c b/docs/examples/http2-pushinmemory.c
index a51232e359..e99fe746d0 100644
--- a/docs/examples/http2-pushinmemory.c
+++ b/docs/examples/http2-pushinmemory.c
@@ -126,7 +126,7 @@ int main(void)
   int i;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* init a multi stack */
diff --git a/docs/examples/http2-serverpush.c b/docs/examples/http2-serverpush.c
index afeec76949..e54675ceac 100644
--- a/docs/examples/http2-serverpush.c
+++ b/docs/examples/http2-serverpush.c
@@ -226,7 +226,7 @@ int main(int argc, const char *argv[])
     url = argv[1];
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* init a multi stack */
diff --git a/docs/examples/http2-upload.c b/docs/examples/http2-upload.c
index b2657940e5..d044aa8ac0 100644
--- a/docs/examples/http2-upload.c
+++ b/docs/examples/http2-upload.c
@@ -309,7 +309,7 @@ int main(int argc, const char **argv)
     num_transfers = 3;  /* a suitable low default */
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   trans = calloc(num_transfers, sizeof(*trans));
diff --git a/docs/examples/http3-present.c b/docs/examples/http3-present.c
index ee9bdce2d9..5de7d870f4 100644
--- a/docs/examples/http3-present.c
+++ b/docs/examples/http3-present.c
@@ -34,7 +34,7 @@ int main(void)
   curl_version_info_data *ver;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   ver = curl_version_info(CURLVERSION_NOW);
diff --git a/docs/examples/http3.c b/docs/examples/http3.c
index 702c7d9ac3..7b52e43a9a 100644
--- a/docs/examples/http3.c
+++ b/docs/examples/http3.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/httpcustomheader.c b/docs/examples/httpcustomheader.c
index 7888dfab38..1d500b2352 100644
--- a/docs/examples/httpcustomheader.c
+++ b/docs/examples/httpcustomheader.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/httpput-postfields.c b/docs/examples/httpput-postfields.c
index 88eb55f06e..8a30ac67db 100644
--- a/docs/examples/httpput-postfields.c
+++ b/docs/examples/httpput-postfields.c
@@ -60,7 +60,7 @@ int main(int argc, const char **argv)
 
   /* In Windows, this inits the Winsock stuff */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* get a curl handle */
diff --git a/docs/examples/httpput.c b/docs/examples/httpput.c
index 9fd808814f..58be20151e 100644
--- a/docs/examples/httpput.c
+++ b/docs/examples/httpput.c
@@ -104,7 +104,7 @@ int main(int argc, const char **argv)
 
   /* In Windows, this inits the Winsock stuff */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fclose(hd_src);
     return (int)result;
   }
diff --git a/docs/examples/https.c b/docs/examples/https.c
index 7bb11d21e0..5fefb5eea3 100644
--- a/docs/examples/https.c
+++ b/docs/examples/https.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-append.c b/docs/examples/imap-append.c
index 7bd75edd93..8d7663a611 100644
--- a/docs/examples/imap-append.c
+++ b/docs/examples/imap-append.c
@@ -88,7 +88,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-authzid.c b/docs/examples/imap-authzid.c
index bf9a61f6af..0130d4cf19 100644
--- a/docs/examples/imap-authzid.c
+++ b/docs/examples/imap-authzid.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-copy.c b/docs/examples/imap-copy.c
index 91d95b12a6..e19d4b480d 100644
--- a/docs/examples/imap-copy.c
+++ b/docs/examples/imap-copy.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-create.c b/docs/examples/imap-create.c
index 259dc2232f..f1eadb5860 100644
--- a/docs/examples/imap-create.c
+++ b/docs/examples/imap-create.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-delete.c b/docs/examples/imap-delete.c
index 03e9d2ad7d..9d33f6fa6b 100644
--- a/docs/examples/imap-delete.c
+++ b/docs/examples/imap-delete.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-examine.c b/docs/examples/imap-examine.c
index fcb960ce50..083708b6c8 100644
--- a/docs/examples/imap-examine.c
+++ b/docs/examples/imap-examine.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-fetch.c b/docs/examples/imap-fetch.c
index b067d15385..c3d6af75c2 100644
--- a/docs/examples/imap-fetch.c
+++ b/docs/examples/imap-fetch.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-list.c b/docs/examples/imap-list.c
index 263219eded..1c1074f85b 100644
--- a/docs/examples/imap-list.c
+++ b/docs/examples/imap-list.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-lsub.c b/docs/examples/imap-lsub.c
index 75dbd3ceae..7ffeba04f7 100644
--- a/docs/examples/imap-lsub.c
+++ b/docs/examples/imap-lsub.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-multi.c b/docs/examples/imap-multi.c
index 35aff98ad9..192ba15cfd 100644
--- a/docs/examples/imap-multi.c
+++ b/docs/examples/imap-multi.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-noop.c b/docs/examples/imap-noop.c
index 9407242918..5b53c03d48 100644
--- a/docs/examples/imap-noop.c
+++ b/docs/examples/imap-noop.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-search.c b/docs/examples/imap-search.c
index c548829cb5..f06f6a551d 100644
--- a/docs/examples/imap-search.c
+++ b/docs/examples/imap-search.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-ssl.c b/docs/examples/imap-ssl.c
index 0ec84d7472..77a0880a32 100644
--- a/docs/examples/imap-ssl.c
+++ b/docs/examples/imap-ssl.c
@@ -41,7 +41,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-store.c b/docs/examples/imap-store.c
index db0310b6b0..c1e9de9a91 100644
--- a/docs/examples/imap-store.c
+++ b/docs/examples/imap-store.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/imap-tls.c b/docs/examples/imap-tls.c
index 6c09380221..486bc8c467 100644
--- a/docs/examples/imap-tls.c
+++ b/docs/examples/imap-tls.c
@@ -41,7 +41,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/interface.c b/docs/examples/interface.c
index cfe3180f56..870f94057a 100644
--- a/docs/examples/interface.c
+++ b/docs/examples/interface.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/ipv6.c b/docs/examples/ipv6.c
index 03e2a0726c..607d9d4096 100644
--- a/docs/examples/ipv6.c
+++ b/docs/examples/ipv6.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/keepalive.c b/docs/examples/keepalive.c
index 7427673394..f6aa692897 100644
--- a/docs/examples/keepalive.c
+++ b/docs/examples/keepalive.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/localport.c b/docs/examples/localport.c
index 6cb863cd8d..1027c4387f 100644
--- a/docs/examples/localport.c
+++ b/docs/examples/localport.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/log_failed_transfers.c b/docs/examples/log_failed_transfers.c
index 3f651c059b..3d9bfb0ad8 100644
--- a/docs/examples/log_failed_transfers.c
+++ b/docs/examples/log_failed_transfers.c
@@ -225,7 +225,7 @@ int main(void)
   transfer[1].logfile = "400_transfer_log.txt";
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fprintf(stderr, "curl_global_init failed\n");
     return (int)result;
   }
diff --git a/docs/examples/maxconnects.c b/docs/examples/maxconnects.c
index 0efcaeac1c..3c6f3c8b3d 100644
--- a/docs/examples/maxconnects.c
+++ b/docs/examples/maxconnects.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/multi-app.c b/docs/examples/multi-app.c
index 44aec5bb21..4a1f3b1f97 100644
--- a/docs/examples/multi-app.c
+++ b/docs/examples/multi-app.c
@@ -47,7 +47,7 @@ int main(void)
   int i;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* Allocate one curl handle per transfer */
diff --git a/docs/examples/multi-debugcallback.c b/docs/examples/multi-debugcallback.c
index 05e51f9a4f..af1713c260 100644
--- a/docs/examples/multi-debugcallback.c
+++ b/docs/examples/multi-debugcallback.c
@@ -118,7 +118,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/multi-double.c b/docs/examples/multi-double.c
index 04ea342ed8..709b949903 100644
--- a/docs/examples/multi-double.c
+++ b/docs/examples/multi-double.c
@@ -39,7 +39,7 @@ int main(void)
   CURL *curl2;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/multi-event.c b/docs/examples/multi-event.c
index b748238904..4c52cbe3b3 100644
--- a/docs/examples/multi-event.c
+++ b/docs/examples/multi-event.c
@@ -221,7 +221,7 @@ int main(int argc, const char **argv)
     return 0;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fprintf(stderr, "Could not init curl\n");
     return (int)result;
   }
diff --git a/docs/examples/multi-formadd.c b/docs/examples/multi-formadd.c
index 6611f2f12e..8816d69171 100644
--- a/docs/examples/multi-formadd.c
+++ b/docs/examples/multi-formadd.c
@@ -44,7 +44,7 @@ int main(void)
   static const char buf[] = "Expect:";
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   CURL_IGNORE_DEPRECATION(
diff --git a/docs/examples/multi-legacy.c b/docs/examples/multi-legacy.c
index 1c14ea0bd0..a0580c6712 100644
--- a/docs/examples/multi-legacy.c
+++ b/docs/examples/multi-legacy.c
@@ -53,7 +53,7 @@ int main(void)
   int i;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* Allocate one curl handle per transfer */
diff --git a/docs/examples/multi-post.c b/docs/examples/multi-post.c
index 48db32ff39..b5d557ce8a 100644
--- a/docs/examples/multi-post.c
+++ b/docs/examples/multi-post.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/multi-single.c b/docs/examples/multi-single.c
index 0cf18891fd..5f0380a6f4 100644
--- a/docs/examples/multi-single.c
+++ b/docs/examples/multi-single.c
@@ -39,7 +39,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/multi-uv.c b/docs/examples/multi-uv.c
index 6928408461..8d6227fc7e 100644
--- a/docs/examples/multi-uv.c
+++ b/docs/examples/multi-uv.c
@@ -237,7 +237,7 @@ int main(int argc, const char **argv)
     return 0;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   uv.loop = uv_default_loop();
diff --git a/docs/examples/netrc.c b/docs/examples/netrc.c
index 8bc998ae43..d862210445 100644
--- a/docs/examples/netrc.c
+++ b/docs/examples/netrc.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/persistent.c b/docs/examples/persistent.c
index 50d110f3e0..852f923dd1 100644
--- a/docs/examples/persistent.c
+++ b/docs/examples/persistent.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-authzid.c b/docs/examples/pop3-authzid.c
index ed7993d85f..3f40e78c71 100644
--- a/docs/examples/pop3-authzid.c
+++ b/docs/examples/pop3-authzid.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-dele.c b/docs/examples/pop3-dele.c
index f872b882e4..69ee1de992 100644
--- a/docs/examples/pop3-dele.c
+++ b/docs/examples/pop3-dele.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-list.c b/docs/examples/pop3-list.c
index 7cc9a249d5..9a2693d3b1 100644
--- a/docs/examples/pop3-list.c
+++ b/docs/examples/pop3-list.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-multi.c b/docs/examples/pop3-multi.c
index 741b7f8d2d..4e69172e4b 100644
--- a/docs/examples/pop3-multi.c
+++ b/docs/examples/pop3-multi.c
@@ -41,7 +41,7 @@ int main(void)
   CURL *curl;
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-noop.c b/docs/examples/pop3-noop.c
index 5e05713ec6..4b1b050182 100644
--- a/docs/examples/pop3-noop.c
+++ b/docs/examples/pop3-noop.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-retr.c b/docs/examples/pop3-retr.c
index af7e40293a..c0c9e92791 100644
--- a/docs/examples/pop3-retr.c
+++ b/docs/examples/pop3-retr.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-ssl.c b/docs/examples/pop3-ssl.c
index c38d41152a..221a0ab703 100644
--- a/docs/examples/pop3-ssl.c
+++ b/docs/examples/pop3-ssl.c
@@ -41,7 +41,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-stat.c b/docs/examples/pop3-stat.c
index 160f013d2d..4f16546c2b 100644
--- a/docs/examples/pop3-stat.c
+++ b/docs/examples/pop3-stat.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-tls.c b/docs/examples/pop3-tls.c
index 4258088722..ce38d044f0 100644
--- a/docs/examples/pop3-tls.c
+++ b/docs/examples/pop3-tls.c
@@ -41,7 +41,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-top.c b/docs/examples/pop3-top.c
index b961487685..177417fde6 100644
--- a/docs/examples/pop3-top.c
+++ b/docs/examples/pop3-top.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/pop3-uidl.c b/docs/examples/pop3-uidl.c
index 4cf571621a..98f4a3f14a 100644
--- a/docs/examples/pop3-uidl.c
+++ b/docs/examples/pop3-uidl.c
@@ -40,7 +40,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/postinmemory.c b/docs/examples/postinmemory.c
index f310c14489..5b3251f506 100644
--- a/docs/examples/postinmemory.c
+++ b/docs/examples/postinmemory.c
@@ -64,7 +64,7 @@ int main(void)
   static const char *postthis = "Field=1&Field=2&Field=3";
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   chunk.memory = malloc(1);  /* grown as needed by realloc above */
diff --git a/docs/examples/postit2-formadd.c b/docs/examples/postit2-formadd.c
index 3c297478ff..c760bcb0da 100644
--- a/docs/examples/postit2-formadd.c
+++ b/docs/examples/postit2-formadd.c
@@ -56,7 +56,7 @@ int main(int argc, const char *argv[])
   static const char buf[] = "Expect:";
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   CURL_IGNORE_DEPRECATION(
diff --git a/docs/examples/postit2.c b/docs/examples/postit2.c
index 5632717cd4..0bc1e6a48f 100644
--- a/docs/examples/postit2.c
+++ b/docs/examples/postit2.c
@@ -47,7 +47,7 @@ int main(int argc, const char *argv[])
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/progressfunc.c b/docs/examples/progressfunc.c
index 22f876b5c8..4138a6b63f 100644
--- a/docs/examples/progressfunc.c
+++ b/docs/examples/progressfunc.c
@@ -78,7 +78,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/protofeats.c b/docs/examples/protofeats.c
index e8d8540089..73cbf1c221 100644
--- a/docs/examples/protofeats.c
+++ b/docs/examples/protofeats.c
@@ -39,7 +39,7 @@ int main(void)
   const char * const *ptr;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   ver = curl_version_info(CURLVERSION_NOW);
diff --git a/docs/examples/range.c b/docs/examples/range.c
index 9555725dab..857ee92600 100644
--- a/docs/examples/range.c
+++ b/docs/examples/range.c
@@ -32,7 +32,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/resolve.c b/docs/examples/resolve.c
index e56c8efb87..9c87bc0086 100644
--- a/docs/examples/resolve.c
+++ b/docs/examples/resolve.c
@@ -43,7 +43,7 @@ int main(void)
                                               "example.com:443:127.0.0.1");
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/rtsp-options.c b/docs/examples/rtsp-options.c
index 7c7ff945f9..c7800460b4 100644
--- a/docs/examples/rtsp-options.c
+++ b/docs/examples/rtsp-options.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/sendrecv.c b/docs/examples/sendrecv.c
index deadefa21e..964fc6e0b8 100644
--- a/docs/examples/sendrecv.c
+++ b/docs/examples/sendrecv.c
@@ -81,7 +81,7 @@ int main(void)
   size_t request_len = strlen(request);
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* A general note of caution here: if you are using curl_easy_recv() or
diff --git a/docs/examples/sepheaders.c b/docs/examples/sepheaders.c
index 134ecb94a4..e300205223 100644
--- a/docs/examples/sepheaders.c
+++ b/docs/examples/sepheaders.c
@@ -47,7 +47,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* init the curl session */
diff --git a/docs/examples/sessioninfo.c b/docs/examples/sessioninfo.c
index 788ccf575b..3872180b77 100644
--- a/docs/examples/sessioninfo.c
+++ b/docs/examples/sessioninfo.c
@@ -53,7 +53,7 @@ static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *stream)
 
   result = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
 
-  if(!result) {
+  if(result == CURLE_OK) {
     unsigned int cert_list_size;
     const gnutls_datum_t *chainp;
 
@@ -97,7 +97,7 @@ static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *stream)
 int main(void)
 {
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/sftpget.c b/docs/examples/sftpget.c
index df9b4d7f31..02f2070882 100644
--- a/docs/examples/sftpget.c
+++ b/docs/examples/sftpget.c
@@ -71,7 +71,7 @@ int main(void)
   };
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/sftpuploadresume.c b/docs/examples/sftpuploadresume.c
index e774820b09..153883640b 100644
--- a/docs/examples/sftpuploadresume.c
+++ b/docs/examples/sftpuploadresume.c
@@ -73,7 +73,7 @@ static curl_off_t sftpGetRemoteFileSize(const char *i_remoteFile)
     if(result == CURLE_OK) {
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
                                  &remoteFileSizeByte);
-      if(result)
+      if(result != CURLE_OK)
         return -1;
       printf("filesize: %" CURL_FORMAT_CURL_OFF_T "\n", remoteFileSizeByte);
     }
@@ -129,7 +129,7 @@ int main(void)
   CURL *curl = NULL;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/shared-connection-cache.c b/docs/examples/shared-connection-cache.c
index 475bb182a8..00ebc3b759 100644
--- a/docs/examples/shared-connection-cache.c
+++ b/docs/examples/shared-connection-cache.c
@@ -53,7 +53,7 @@ int main(void)
   int i;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   share = curl_share_init();
diff --git a/docs/examples/simple.c b/docs/examples/simple.c
index 6f0751775f..b7b48d7777 100644
--- a/docs/examples/simple.c
+++ b/docs/examples/simple.c
@@ -34,7 +34,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/simplepost.c b/docs/examples/simplepost.c
index 7b9356acf9..d2540151ce 100644
--- a/docs/examples/simplepost.c
+++ b/docs/examples/simplepost.c
@@ -37,7 +37,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/simplessl.c b/docs/examples/simplessl.c
index 9885dfd91d..f1c07a4ae2 100644
--- a/docs/examples/simplessl.c
+++ b/docs/examples/simplessl.c
@@ -71,7 +71,7 @@ int main(void)
 #endif
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     return (int)result;
   }
 
diff --git a/docs/examples/smooth-gtk-thread.c b/docs/examples/smooth-gtk-thread.c
index 64595f3955..694426f911 100644
--- a/docs/examples/smooth-gtk-thread.c
+++ b/docs/examples/smooth-gtk-thread.c
@@ -172,7 +172,7 @@ int main(int argc, const char **argv)
 
   /* Must initialize libcurl before any threads are started */
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* Init thread */
diff --git a/docs/examples/smtp-authzid.c b/docs/examples/smtp-authzid.c
index 64540cb033..e06946869f 100644
--- a/docs/examples/smtp-authzid.c
+++ b/docs/examples/smtp-authzid.c
@@ -93,7 +93,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-expn.c b/docs/examples/smtp-expn.c
index 9b201240dc..42a7480625 100644
--- a/docs/examples/smtp-expn.c
+++ b/docs/examples/smtp-expn.c
@@ -43,7 +43,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-mail.c b/docs/examples/smtp-mail.c
index 0a3e73d39f..d4a73e0690 100644
--- a/docs/examples/smtp-mail.c
+++ b/docs/examples/smtp-mail.c
@@ -90,7 +90,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-mime.c b/docs/examples/smtp-mime.c
index 7aa610789a..0ddba4ebb7 100644
--- a/docs/examples/smtp-mime.c
+++ b/docs/examples/smtp-mime.c
@@ -71,7 +71,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-multi.c b/docs/examples/smtp-multi.c
index 0ce6911152..2cfdbb5793 100644
--- a/docs/examples/smtp-multi.c
+++ b/docs/examples/smtp-multi.c
@@ -83,7 +83,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-ssl.c b/docs/examples/smtp-ssl.c
index acc559562f..73c8b6a708 100644
--- a/docs/examples/smtp-ssl.c
+++ b/docs/examples/smtp-ssl.c
@@ -87,7 +87,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-tls.c b/docs/examples/smtp-tls.c
index 3b622859ca..f5cafaeb81 100644
--- a/docs/examples/smtp-tls.c
+++ b/docs/examples/smtp-tls.c
@@ -87,7 +87,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/smtp-vrfy.c b/docs/examples/smtp-vrfy.c
index 4d5a8ad601..b60dfef25e 100644
--- a/docs/examples/smtp-vrfy.c
+++ b/docs/examples/smtp-vrfy.c
@@ -46,7 +46,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/synctime.c b/docs/examples/synctime.c
index e9b730d50a..730e01641f 100644
--- a/docs/examples/synctime.c
+++ b/docs/examples/synctime.c
@@ -275,7 +275,7 @@ int main(int argc, const char *argv[])
 
   /* Init CURL before usage */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/threaded.c b/docs/examples/threaded.c
index 9eeffa78f6..a8788b7eec 100644
--- a/docs/examples/threaded.c
+++ b/docs/examples/threaded.c
@@ -88,7 +88,7 @@ int main(void)
 
   /* Must initialize libcurl before any threads are started */
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   for(i = 0; i < NUMT; i++) {
diff --git a/docs/examples/unixsocket.c b/docs/examples/unixsocket.c
index 4a1a2937d6..01810fd624 100644
--- a/docs/examples/unixsocket.c
+++ b/docs/examples/unixsocket.c
@@ -43,7 +43,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/url2file.c b/docs/examples/url2file.c
index 3370ac2f79..9ff0dd4fca 100644
--- a/docs/examples/url2file.c
+++ b/docs/examples/url2file.c
@@ -55,7 +55,7 @@ int main(int argc, const char *argv[])
   }
 
   result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result) {
+  if(result != CURLE_OK) {
     fprintf(stderr, "Could not init curl\n");
     return (int)result;
   }
diff --git a/docs/examples/urlapi.c b/docs/examples/urlapi.c
index 4d6c6444bd..50175da76e 100644
--- a/docs/examples/urlapi.c
+++ b/docs/examples/urlapi.c
@@ -39,7 +39,7 @@ int main(void)
   CURLUcode uc;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* init curl URL */
diff --git a/docs/examples/usercertinmem.c b/docs/examples/usercertinmem.c
index 6c782647c7..7caa4be626 100644
--- a/docs/examples/usercertinmem.c
+++ b/docs/examples/usercertinmem.c
@@ -159,7 +159,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/websocket-cb.c b/docs/examples/websocket-cb.c
index defde4c0fe..e73cc27a3f 100644
--- a/docs/examples/websocket-cb.c
+++ b/docs/examples/websocket-cb.c
@@ -46,7 +46,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/websocket-updown.c b/docs/examples/websocket-updown.c
index 8cbb938e9d..3a7f07767f 100644
--- a/docs/examples/websocket-updown.c
+++ b/docs/examples/websocket-updown.c
@@ -60,14 +60,14 @@ static size_t read_cb(char *buf, size_t nitems, size_t buflen, void *p)
   struct read_ctx *ctx = p;
   size_t len = nitems * buflen;
   size_t left = ctx->blen - ctx->nsent;
-  CURLcode result;
 
   if(!ctx->nsent) {
+    CURLcode result;
     /* On first call, set the FRAME information to be used (it defaults to
      * CURLWS_BINARY otherwise). */
     result = curl_ws_start_frame(ctx->curl, CURLWS_TEXT,
                                  (curl_off_t)ctx->blen);
-    if(result) {
+    if(result != CURLE_OK) {
       fprintf(stderr, "error starting frame: %d\n", result);
       return CURL_READFUNC_ABORT;
     }
@@ -90,7 +90,7 @@ int main(int argc, const char *argv[])
   const char *payload = "Hello, friend!";
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   memset(&rctx, 0, sizeof(rctx));
diff --git a/docs/examples/websocket.c b/docs/examples/websocket.c
index 2fa53028a8..834cab0c4c 100644
--- a/docs/examples/websocket.c
+++ b/docs/examples/websocket.c
@@ -45,7 +45,7 @@ static CURLcode ping(CURL *curl, const char *send_payload)
 
   while(blen) {
     result = curl_ws_send(curl, buf, blen, &sent, 0, CURLWS_PING);
-    if(!result) {
+    if(result == CURLE_OK) {
       buf += sent; /* deduct what was sent */
       blen -= sent;
     }
@@ -57,7 +57,7 @@ static CURLcode ping(CURL *curl, const char *send_payload)
     else /* real error sending */
       break;
   }
-  if(!result)
+  if(result == CURLE_OK)
     fprintf(stderr, "ws: sent PING with payload\n");
   return result;
 }
@@ -71,7 +71,7 @@ static CURLcode recv_pong(CURL *curl, const char *expected_payload)
 
 retry:
   result = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
-  if(!result) {
+  if(result == CURLE_OK) {
     /* on small PING content, this example assumes the complete
      * PONG content arrives in one go. Larger frames will arrive
      * in chunks, however. */
@@ -104,7 +104,7 @@ retry:
                  be good here. */
     goto retry;
   }
-  if(result)
+  if(result != CURLE_OK)
     fprintf(stderr, "ws: curl_ws_recv returned %u, received %u\n",
             (unsigned int)result, (unsigned int)rlen);
   return result;
@@ -123,10 +123,10 @@ static CURLcode websocket(CURL *curl)
   int i = 0;
   do {
     result = ping(curl, "foobar");
-    if(result)
+    if(result != CURLE_OK)
       break;
     result = recv_pong(curl, "foobar");
-    if(result)
+    if(result != CURLE_OK)
       break;
     sleep(1);
   } while(i++ < 10);
@@ -139,7 +139,7 @@ int main(int argc, const char *argv[])
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   curl = curl_easy_init();
diff --git a/docs/examples/xmlstream.c b/docs/examples/xmlstream.c
index 9122c491dc..2ad132f282 100644
--- a/docs/examples/xmlstream.c
+++ b/docs/examples/xmlstream.c
@@ -119,7 +119,7 @@ int main(void)
   CURL *curl;
 
   CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
-  if(result)
+  if(result != CURLE_OK)
     return (int)result;
 
   /* Initialize a libcurl handle. */
diff --git a/docs/libcurl/curl_easy_cleanup.md b/docs/libcurl/curl_easy_cleanup.md
index ee722ca84d..bf9b18b363 100644
--- a/docs/libcurl/curl_easy_cleanup.md
+++ b/docs/libcurl/curl_easy_cleanup.md
@@ -65,7 +65,7 @@ int main(void)
     CURLcode result;
     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
     result = curl_easy_perform(curl);
-    if(result)
+    if(result != CURLE_OK)
       printf("error: %s\n", curl_easy_strerror(result));
     curl_easy_cleanup(curl);
   }
diff --git a/docs/libcurl/curl_ws_start_frame.md b/docs/libcurl/curl_ws_start_frame.md
index 84b8065d93..3fea3604b1 100644
--- a/docs/libcurl/curl_ws_start_frame.md
+++ b/docs/libcurl/curl_ws_start_frame.md
@@ -77,13 +77,13 @@ static size_t readcb(char *buf, size_t nitems, size_t buflen, void *p)
   struct read_ctx *ctx = p;
   size_t len = nitems * buflen;
   size_t left = ctx->msg_len - ctx->nsent;
-  CURLcode result;
 
   if(!ctx->nsent) {
+    CURLcode result;
     /* Want to send TEXT frame. */
     result = curl_ws_start_frame(ctx->easy, CURLWS_TEXT,
                                  (curl_off_t)ctx->msg_len);
-    if(result) {
+    if(result != CURLE_OK) {
       fprintf(stderr, "error starting frame: %d\n", result);
       return CURL_READFUNC_ABORT;
     }
diff --git a/docs/libcurl/opts/CURLINFO_CERTINFO.md b/docs/libcurl/opts/CURLINFO_CERTINFO.md
index e24115f98f..0882cbccd1 100644
--- a/docs/libcurl/opts/CURLINFO_CERTINFO.md
+++ b/docs/libcurl/opts/CURLINFO_CERTINFO.md
@@ -71,12 +71,12 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       int i;
       struct curl_certinfo *ci;
       result = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
 
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("%d certs!\n", ci->num_of_certs);
 
         for(i = 0; i < ci->num_of_certs; i++) {
diff --git a/docs/libcurl/opts/CURLINFO_CONDITION_UNMET.md b/docs/libcurl/opts/CURLINFO_CONDITION_UNMET.md
index 1705967dfe..8e44e7bd94 100644
--- a/docs/libcurl/opts/CURLINFO_CONDITION_UNMET.md
+++ b/docs/libcurl/opts/CURLINFO_CONDITION_UNMET.md
@@ -59,11 +59,11 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the time condition */
       long unmet;
       result = curl_easy_getinfo(curl, CURLINFO_CONDITION_UNMET, &unmet);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("The time condition was %sfulfilled\n", unmet?"NOT":"");
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONN_ID.md b/docs/libcurl/opts/CURLINFO_CONN_ID.md
index 75e2ccc5eb..3d111e6b62 100644
--- a/docs/libcurl/opts/CURLINFO_CONN_ID.md
+++ b/docs/libcurl/opts/CURLINFO_CONN_ID.md
@@ -51,10 +51,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t conn_id;
       result = curl_easy_getinfo(curl, CURLINFO_CONN_ID, &conn_id);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Connection used: %" CURL_FORMAT_CURL_OFF_T "\n", conn_id);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.md b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.md
index 1142617c19..7173f8effb 100644
--- a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD.md
@@ -50,11 +50,11 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       double cl;
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Size: %.0f\n", cl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD_T.md b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD_T.md
index 4f8faf6e99..d0a95f6144 100644
--- a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_DOWNLOAD_T.md
@@ -47,12 +47,12 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       curl_off_t cl;
       result =
         curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T, &cl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Download size: %" CURL_FORMAT_CURL_OFF_T "\n", cl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD.md b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD.md
index 546325f179..6ccd47f1ad 100644
--- a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD.md
@@ -49,11 +49,11 @@ int main(void)
     /* Perform the upload */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       double cl;
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_UPLOAD, &cl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Size: %.0f\n", cl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD_T.md b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD_T.md
index 6ad40241fe..219481f43d 100644
--- a/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_CONTENT_LENGTH_UPLOAD_T.md
@@ -46,11 +46,11 @@ int main(void)
     /* Perform the upload */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       curl_off_t cl;
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_UPLOAD_T, &cl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Upload size: %" CURL_FORMAT_CURL_OFF_T "\n", cl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_CONTENT_TYPE.md b/docs/libcurl/opts/CURLINFO_CONTENT_TYPE.md
index 8de0a65461..13feaca953 100644
--- a/docs/libcurl/opts/CURLINFO_CONTENT_TYPE.md
+++ b/docs/libcurl/opts/CURLINFO_CONTENT_TYPE.md
@@ -54,7 +54,7 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract the content-type */
       char *ct = NULL;
       result = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
diff --git a/docs/libcurl/opts/CURLINFO_COOKIELIST.md b/docs/libcurl/opts/CURLINFO_COOKIELIST.md
index 7d0925500d..04a618e860 100644
--- a/docs/libcurl/opts/CURLINFO_COOKIELIST.md
+++ b/docs/libcurl/opts/CURLINFO_COOKIELIST.md
@@ -54,7 +54,7 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract all known cookies */
       struct curl_slist *cookies = NULL;
       result = curl_easy_getinfo(curl, CURLINFO_COOKIELIST, &cookies);
diff --git a/docs/libcurl/opts/CURLINFO_EARLYDATA_SENT_T.md b/docs/libcurl/opts/CURLINFO_EARLYDATA_SENT_T.md
index c2cb4a558e..c326c31f45 100644
--- a/docs/libcurl/opts/CURLINFO_EARLYDATA_SENT_T.md
+++ b/docs/libcurl/opts/CURLINFO_EARLYDATA_SENT_T.md
@@ -57,10 +57,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t amount;
       result = curl_easy_getinfo(curl, CURLINFO_EARLYDATA_SENT_T, &amount);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("TLS earlydata: %" CURL_FORMAT_CURL_OFF_T " bytes\n", amount);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_FTP_ENTRY_PATH.md b/docs/libcurl/opts/CURLINFO_FTP_ENTRY_PATH.md
index 058d273ba0..4efccececc 100644
--- a/docs/libcurl/opts/CURLINFO_FTP_ENTRY_PATH.md
+++ b/docs/libcurl/opts/CURLINFO_FTP_ENTRY_PATH.md
@@ -50,7 +50,7 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract the entry path */
       char *ep = NULL;
       result = curl_easy_getinfo(curl, CURLINFO_FTP_ENTRY_PATH, &ep);
diff --git a/docs/libcurl/opts/CURLINFO_HEADER_SIZE.md b/docs/libcurl/opts/CURLINFO_HEADER_SIZE.md
index a537f0408e..c27856809e 100644
--- a/docs/libcurl/opts/CURLINFO_HEADER_SIZE.md
+++ b/docs/libcurl/opts/CURLINFO_HEADER_SIZE.md
@@ -49,7 +49,7 @@ int main(void)
     if(result == CURLE_OK) {
       long size;
       result = curl_easy_getinfo(curl, CURLINFO_HEADER_SIZE, &size);
-      if(!result)
+      if(result == CURLE_OK)
         printf("Header size: %ld bytes\n", size);
     }
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_HTTPAUTH_AVAIL.md b/docs/libcurl/opts/CURLINFO_HTTPAUTH_AVAIL.md
index 8829227c98..4ff3578735 100644
--- a/docs/libcurl/opts/CURLINFO_HTTPAUTH_AVAIL.md
+++ b/docs/libcurl/opts/CURLINFO_HTTPAUTH_AVAIL.md
@@ -46,11 +46,11 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract the available authentication types */
       long auth;
       result = curl_easy_getinfo(curl, CURLINFO_HTTPAUTH_AVAIL, &auth);
-      if(!result) {
+      if(result == CURLE_OK) {
         if(!auth)
           printf("No auth available, perhaps no 401?\n");
         else {
diff --git a/docs/libcurl/opts/CURLINFO_HTTPAUTH_USED.md b/docs/libcurl/opts/CURLINFO_HTTPAUTH_USED.md
index 031691402b..99db88d3f3 100644
--- a/docs/libcurl/opts/CURLINFO_HTTPAUTH_USED.md
+++ b/docs/libcurl/opts/CURLINFO_HTTPAUTH_USED.md
@@ -50,10 +50,10 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       long auth;
       result = curl_easy_getinfo(curl, CURLINFO_HTTPAUTH_USED, &auth);
-      if(!result) {
+      if(result == CURLE_OK) {
         if(!auth)
           printf("No auth used\n");
         else {
diff --git a/docs/libcurl/opts/CURLINFO_NUM_CONNECTS.md b/docs/libcurl/opts/CURLINFO_NUM_CONNECTS.md
index dfac440979..efb568ad77 100644
--- a/docs/libcurl/opts/CURLINFO_NUM_CONNECTS.md
+++ b/docs/libcurl/opts/CURLINFO_NUM_CONNECTS.md
@@ -49,7 +49,7 @@ int main(void)
     if(result == CURLE_OK) {
       long connects;
       result = curl_easy_getinfo(curl, CURLINFO_NUM_CONNECTS, &connects);
-      if(!result)
+      if(result == CURLE_OK)
         printf("It needed %ld connects\n", connects);
     }
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_PRIMARY_PORT.md b/docs/libcurl/opts/CURLINFO_PRIMARY_PORT.md
index 58b8c0d1b4..f8a2deee97 100644
--- a/docs/libcurl/opts/CURLINFO_PRIMARY_PORT.md
+++ b/docs/libcurl/opts/CURLINFO_PRIMARY_PORT.md
@@ -56,7 +56,7 @@ int main(void)
     if(result == CURLE_OK) {
       long port;
       result = curl_easy_getinfo(curl, CURLINFO_PRIMARY_PORT, &port);
-      if(!result)
+      if(result == CURLE_OK)
         printf("Connected to remote port: %ld\n", port);
     }
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_PRIVATE.md b/docs/libcurl/opts/CURLINFO_PRIVATE.md
index ac4fb82e15..f76b277a70 100644
--- a/docs/libcurl/opts/CURLINFO_PRIVATE.md
+++ b/docs/libcurl/opts/CURLINFO_PRIVATE.md
@@ -52,7 +52,7 @@ int main(void)
     /* extract the private pointer again */
     result = curl_easy_getinfo(curl, CURLINFO_PRIVATE, &pointer);
 
-    if(result)
+    if(result != CURLE_OK)
       printf("error: %s\n", curl_easy_strerror(result));
 
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_PROXYAUTH_AVAIL.md b/docs/libcurl/opts/CURLINFO_PROXYAUTH_AVAIL.md
index 16161aabee..e38f2f6245 100644
--- a/docs/libcurl/opts/CURLINFO_PROXYAUTH_AVAIL.md
+++ b/docs/libcurl/opts/CURLINFO_PROXYAUTH_AVAIL.md
@@ -47,11 +47,11 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract the available proxy authentication types */
       long auth;
       result = curl_easy_getinfo(curl, CURLINFO_PROXYAUTH_AVAIL, &auth);
-      if(!result) {
+      if(result == CURLE_OK) {
         if(!auth)
           printf("No proxy auth available, perhaps no 407?\n");
         else {
diff --git a/docs/libcurl/opts/CURLINFO_PROXYAUTH_USED.md b/docs/libcurl/opts/CURLINFO_PROXYAUTH_USED.md
index e0788c63f2..9c2ee5b15f 100644
--- a/docs/libcurl/opts/CURLINFO_PROXYAUTH_USED.md
+++ b/docs/libcurl/opts/CURLINFO_PROXYAUTH_USED.md
@@ -53,10 +53,10 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       long auth;
       result = curl_easy_getinfo(curl, CURLINFO_PROXYAUTH_USED, &auth);
-      if(!result) {
+      if(result == CURLE_OK) {
         if(!auth)
           printf("No auth used\n");
         else {
diff --git a/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.md b/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.md
index 6164eaeafd..f9cef23dac 100644
--- a/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.md
+++ b/docs/libcurl/opts/CURLINFO_PROXY_SSL_VERIFYRESULT.md
@@ -53,7 +53,7 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example:443");
 
     result = curl_easy_perform(curl);
-    if(result) {
+    if(result != CURLE_OK) {
       printf("error: %s\n", curl_easy_strerror(result));
       curl_easy_cleanup(curl);
       return 1;
@@ -61,7 +61,7 @@ int main(void)
 
     result = curl_easy_getinfo(curl, CURLINFO_PROXY_SSL_VERIFYRESULT,
                                &verifyresult);
-    if(!result) {
+    if(result == CURLE_OK) {
       printf("The peer verification said %s\n",
              (verifyresult ? "bad" : "fine"));
     }
diff --git a/docs/libcurl/opts/CURLINFO_REQUEST_SIZE.md b/docs/libcurl/opts/CURLINFO_REQUEST_SIZE.md
index 9657f3de60..35f8aafd7d 100644
--- a/docs/libcurl/opts/CURLINFO_REQUEST_SIZE.md
+++ b/docs/libcurl/opts/CURLINFO_REQUEST_SIZE.md
@@ -47,7 +47,7 @@ int main(void)
     if(result == CURLE_OK) {
       long req;
       result = curl_easy_getinfo(curl, CURLINFO_REQUEST_SIZE, &req);
-      if(!result)
+      if(result == CURLE_OK)
         printf("Request size: %ld bytes\n", req);
     }
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD.md b/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD.md
index 1b04c27ea9..85efc6e2ff 100644
--- a/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD.md
@@ -53,11 +53,11 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       double dl;
       result = curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &dl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Downloaded %.0f bytes\n", dl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD_T.md b/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD_T.md
index 0393c49949..00a1d83d3d 100644
--- a/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_SIZE_DOWNLOAD_T.md
@@ -50,11 +50,11 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* check the size */
       curl_off_t dl;
       result = curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD_T, &dl);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Downloaded %" CURL_FORMAT_CURL_OFF_T " bytes\n", dl);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD.md b/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD.md
index 6111db4a57..4f25a4526a 100644
--- a/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD.md
@@ -50,10 +50,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       double ul;
       result = curl_easy_getinfo(curl, CURLINFO_SIZE_UPLOAD, &ul);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Uploaded %.0f bytes\n", ul);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD_T.md b/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD_T.md
index e75a9809ac..c91e3e7c0d 100644
--- a/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_SIZE_UPLOAD_T.md
@@ -47,10 +47,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t ul;
       result = curl_easy_getinfo(curl, CURLINFO_SIZE_UPLOAD_T, &ul);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Uploaded %" CURL_FORMAT_CURL_OFF_T " bytes\n", ul);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD.md b/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD.md
index c37155686a..892f920d3b 100644
--- a/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD.md
@@ -50,10 +50,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       double speed;
       result = curl_easy_getinfo(curl, CURLINFO_SPEED_DOWNLOAD, &speed);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Download speed %.0f bytes/sec\n", speed);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD_T.md b/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD_T.md
index 3c97fbd5c2..94e5eea305 100644
--- a/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_SPEED_DOWNLOAD_T.md
@@ -47,10 +47,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t speed;
       result = curl_easy_getinfo(curl, CURLINFO_SPEED_DOWNLOAD_T, &speed);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Download speed %" CURL_FORMAT_CURL_OFF_T " bytes/sec\n",
                speed);
       }
diff --git a/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD.md b/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD.md
index 801fe83f04..f2e1223675 100644
--- a/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD.md
+++ b/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD.md
@@ -48,10 +48,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       double speed;
       result = curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Upload speed %.0f bytes/sec\n", speed);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD_T.md b/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD_T.md
index 49e126bb45..b5165f4665 100644
--- a/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD_T.md
+++ b/docs/libcurl/opts/CURLINFO_SPEED_UPLOAD_T.md
@@ -46,10 +46,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t speed;
       result = curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD_T, &speed);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Upload speed %" CURL_FORMAT_CURL_OFF_T " bytes/sec\n", speed);
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_SSL_VERIFYRESULT.md b/docs/libcurl/opts/CURLINFO_SSL_VERIFYRESULT.md
index d4e565b692..af1f911a09 100644
--- a/docs/libcurl/opts/CURLINFO_SSL_VERIFYRESULT.md
+++ b/docs/libcurl/opts/CURLINFO_SSL_VERIFYRESULT.md
@@ -52,7 +52,7 @@ int main(void)
     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
 
     result = curl_easy_perform(curl);
-    if(result) {
+    if(result != CURLE_OK) {
       printf("error: %s\n", curl_easy_strerror(result));
       curl_easy_cleanup(curl);
       return 1;
@@ -60,7 +60,7 @@ int main(void)
 
     result = curl_easy_getinfo(curl, CURLINFO_SSL_VERIFYRESULT,
                                &verifyresult);
-    if(!result) {
+    if(result == CURLE_OK) {
       printf("The peer verification said %s\n",
              (verifyresult ? "bad" : "fine"));
     }
diff --git a/docs/libcurl/opts/CURLINFO_TLS_SESSION.md b/docs/libcurl/opts/CURLINFO_TLS_SESSION.md
index f4e24253b7..39f1a43e2f 100644
--- a/docs/libcurl/opts/CURLINFO_TLS_SESSION.md
+++ b/docs/libcurl/opts/CURLINFO_TLS_SESSION.md
@@ -72,7 +72,7 @@ int main(void)
     struct curl_tlssessioninfo *tls;
     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
     result = curl_easy_perform(curl);
-    if(result)
+    if(result != CURLE_OK)
       printf("error: %s\n", curl_easy_strerror(result));
     curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &tls);
     curl_easy_cleanup(curl);
diff --git a/docs/libcurl/opts/CURLINFO_USED_PROXY.md b/docs/libcurl/opts/CURLINFO_USED_PROXY.md
index 11f367ffa4..34abe2d608 100644
--- a/docs/libcurl/opts/CURLINFO_USED_PROXY.md
+++ b/docs/libcurl/opts/CURLINFO_USED_PROXY.md
@@ -48,11 +48,11 @@ int main(int argc, char *argv[])
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       /* extract the available proxy authentication types */
       long used;
       result = curl_easy_getinfo(curl, CURLINFO_USED_PROXY, &used);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("The proxy was %sused\n", used ? "" : "NOT ");
       }
     }
diff --git a/docs/libcurl/opts/CURLINFO_XFER_ID.md b/docs/libcurl/opts/CURLINFO_XFER_ID.md
index c01ccd2722..34557b7f29 100644
--- a/docs/libcurl/opts/CURLINFO_XFER_ID.md
+++ b/docs/libcurl/opts/CURLINFO_XFER_ID.md
@@ -51,10 +51,10 @@ int main(void)
     /* Perform the request */
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       curl_off_t xfer_id;
       result = curl_easy_getinfo(curl, CURLINFO_XFER_ID, &xfer_id);
-      if(!result) {
+      if(result == CURLE_OK) {
         printf("Transfer ID: %" CURL_FORMAT_CURL_OFF_T "\n", xfer_id);
       }
     }
diff --git a/docs/libcurl/opts/CURLOPT_CERTINFO.md b/docs/libcurl/opts/CURLOPT_CERTINFO.md
index e3bf6be8c4..fdaa0d2132 100644
--- a/docs/libcurl/opts/CURLOPT_CERTINFO.md
+++ b/docs/libcurl/opts/CURLOPT_CERTINFO.md
@@ -64,11 +64,11 @@ int main(void)
 
     result = curl_easy_perform(curl);
 
-    if(!result) {
+    if(result == CURLE_OK) {
       struct curl_certinfo *ci;
       result = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
 
-      if(!result) {
+      if(result == CURLE_OK) {
         int i;
         printf("%d certs!\n", ci->num_of_certs);
 
diff --git a/docs/libcurl/opts/CURLOPT_SSL_CTX_DATA.md b/docs/libcurl/opts/CURLOPT_SSL_CTX_DATA.md
index d8fac3b2e2..a2132ee5b3 100644
--- a/docs/libcurl/opts/CURLOPT_SSL_CTX_DATA.md
+++ b/docs/libcurl/opts/CURLOPT_SSL_CTX_DATA.md
@@ -104,7 +104,7 @@ int main(void)
   curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
   curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, mypem);
   result = curl_easy_perform(curl);
-  if(!result)
+  if(result == CURLE_OK)
     printf("*** transfer succeeded ***\n");
   else
     printf("*** transfer failed ***\n");
diff --git a/docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.md b/docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.md
index dff37bb144..827ab0ba1a 100644
--- a/docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.md
+++ b/docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.md
@@ -157,7 +157,7 @@ int main(void)
   curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
   curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, mypem);
   result = curl_easy_perform(curl);
-  if(!result)
+  if(result == CURLE_OK)
     printf("*** transfer succeeded ***\n");
   else
     printf("*** transfer failed ***\n");