short i/o: fix calls to read to use xread or read_in_full

[thirdparty/git.git] / write_or_die.c

diff --git a/write_or_die.c b/write_or_die.c
index bfe4eeb6494c7076bf7f319cf11628f586142aa5..e7f82639ffb068dd754855ca464a20721a36c9db 100644 (file)
--- a/write_or_die.c
+++ b/write_or_die.c
@@ -1,5 +1,38 @@
 #include "cache.h"
 
+int read_in_full(int fd, void *buf, size_t count)
+{
+       char *p = buf;
+       ssize_t total = 0;
+       ssize_t loaded = 0;
+
+       while (count > 0) {
+               loaded = xread(fd, p, count);
+               if (loaded <= 0) {
+                       if (total)
+                               return total;
+                       else
+                               return loaded;
+               }
+               count -= loaded;
+               p += loaded;
+               total += loaded;
+       }
+
+       return total;
+}
+
+void read_or_die(int fd, void *buf, size_t count)
+{
+       ssize_t loaded;
+
+       loaded = read_in_full(fd, buf, count);
+       if (loaded == 0)
+               die("unexpected end of file");
+       else if (loaded < 0)
+               die("read error (%s)", strerror(errno));
+}
+
 void write_or_die(int fd, const void *buf, size_t count)
 {
        const char *p = buf;
@@ -19,26 +52,61 @@ void write_or_die(int fd, const void *buf, size_t count)
        }
 }
 
-int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
+int write_in_full(int fd, const void *buf, size_t count)
 {
        const char *p = buf;
-       ssize_t written;
+       ssize_t total = 0;
+       ssize_t wcount = 0;
 
        while (count > 0) {
-               written = xwrite(fd, p, count);
-               if (written == 0) {
-                       fprintf(stderr, "%s: disk full?\n", msg);
-                       return 0;
+               wcount = xwrite(fd, p, count);
+               if (wcount <= 0) {
+                       if (total)
+                               return total;
+                       else
+                               return wcount;
                }
-               else if (written < 0) {
-                       if (errno == EPIPE)
-                               exit(0);
-                       fprintf(stderr, "%s: write error (%s)\n",
-                               msg, strerror(errno));
-                       return 0;
-               }
-               count -= written;
-               p += written;
+               count -= wcount;
+               p += wcount;
+               total += wcount;
+       }
+
+       return wcount;
+}
+
+int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
+{
+       ssize_t written;
+
+       written = write_in_full(fd, buf, count);
+       if (written == 0) {
+               fprintf(stderr, "%s: disk full?\n", msg);
+               return 0;
+       }
+       else if (written < 0) {
+               if (errno == EPIPE)
+                       exit(0);
+               fprintf(stderr, "%s: write error (%s)\n",
+                       msg, strerror(errno));
+               return 0;
+       }
+
+       return 1;
+}
+
+int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
+{
+       ssize_t written;
+
+       written = write_in_full(fd, buf, count);
+       if (written == 0) {
+               fprintf(stderr, "%s: disk full?\n", msg);
+               return 0;
+       }
+       else if (written < 0) {
+               fprintf(stderr, "%s: write error (%s)\n",
+                       msg, strerror(errno));
+               return 0;
        }
 
        return 1;