From 4e5151659401c43679ca2eaa2968650fa051d930 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@google.com>
Date: Tue, 1 Sep 2020 15:39:57 +0200
Subject: [PATCH] configure.ac: Check for strnlen, implement alternative.

Solaris 10 doesn't provide a strnlen(3). Provide a simple alternative if so.
---
 configure.ac              |  1 +
 src/utils/common/common.c | 20 +++++++++++---------
 src/utils/common/common.h |  6 +++++-
 src/utils/strbuf/strbuf.c | 11 +++++++++++
 4 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/configure.ac b/configure.ac
index 45b94ce0d..19c386749 100644
--- a/configure.ac
+++ b/configure.ac
@@ -920,6 +920,7 @@ AC_CHECK_FUNCS([host_statistics], [have_host_statistics="yes"], [have_host_stati
 AC_CHECK_FUNCS([processor_info], [have_processor_info="yes"], [have_processor_info="no"])
 AC_CHECK_FUNCS([statfs], [have_statfs="yes"], [have_statfs="no"])
 AC_CHECK_FUNCS([statvfs], [have_statvfs="yes"], [have_statvfs="no"])
+AC_CHECK_FUNCS([strnlen], [have_strnlen="yes"], [have_strnlen="no"])
 AC_CHECK_FUNCS([sysctl], [have_sysctl="yes"], [have_sysctl="no"])
 AC_CHECK_FUNCS([sysctlbyname], [have_sysctlbyname="yes"], [have_sysctlbyname="no"])
 AC_CHECK_FUNCS([syslog], [have_syslog="yes"], [have_syslog="no"])
diff --git a/src/utils/common/common.c b/src/utils/common/common.c
index 89fe6f52b..eace40f3d 100644
--- a/src/utils/common/common.c
+++ b/src/utils/common/common.c
@@ -162,14 +162,16 @@ char *sstrdup(const char *s) {
   return r;
 } /* char *sstrdup */
 
-size_t sstrnlen(const char *s, size_t n) {
-  const char *p = s;
-
-  while (n-- > 0 && *p)
-    p++;
-
-  return p - s;
-} /* size_t sstrnlen */
+#if !HAVE_STRNLEN
+size_t strnlen(const char *s, size_t maxlen) {
+  for (size_t i = 0; i < maxlen; i++) {
+    if (s[i] == 0) {
+      return i;
+    }
+  }
+  return maxlen;
+}
+#endif
 
 char *sstrndup(const char *s, size_t n) {
   char *r;
@@ -178,7 +180,7 @@ char *sstrndup(const char *s, size_t n) {
   if (s == NULL)
     return NULL;
 
-  sz = sstrnlen(s, n);
+  sz = strnlen(s, n);
   r = malloc(sz + 1);
   if (r == NULL) {
     ERROR("sstrndup: Out of memory.");
diff --git a/src/utils/common/common.h b/src/utils/common/common.h
index b7c9c08ca..2812644a2 100644
--- a/src/utils/common/common.h
+++ b/src/utils/common/common.h
@@ -73,7 +73,11 @@ __attribute__((format(printf, 1, 2))) char *ssnprintf_alloc(char const *format,
                                                             ...);
 
 char *sstrdup(const char *s);
-size_t sstrnlen(const char *s, size_t n);
+
+#if !HAVE_STRNLEN
+size_t strnlen(const char *s, size_t maxlen);
+#endif
+
 char *sstrndup(const char *s, size_t n);
 void *smalloc(size_t size);
 char *sstrerror(int errnum, char *buf, size_t buflen);
diff --git a/src/utils/strbuf/strbuf.c b/src/utils/strbuf/strbuf.c
index d72db6a78..3e4db07a4 100644
--- a/src/utils/strbuf/strbuf.c
+++ b/src/utils/strbuf/strbuf.c
@@ -200,6 +200,17 @@ int strbuf_printf(strbuf_t *buf, char const *format, ...) {
   return 0;
 }
 
+#if !HAVE_STRNLEN
+static size_t strnlen(const char *s, size_t maxlen) {
+  for (size_t i = 0; i < maxlen; i++) {
+    if (s[i] == 0) {
+      return i;
+    }
+  }
+  return maxlen;
+}
+#endif
+
 int strbuf_printn(strbuf_t *buf, char const *s, size_t n) {
   if ((buf == NULL) || (s == NULL))
     return EINVAL;
-- 
2.47.2