add more informative error messages to git-mktag

diff --git a/git-compat-util.h b/git-compat-util.h
index 4185b12741f802842f2aebc128c61051db65c13d..5d543d29f85e432a89bb8cbfbe2d18205599b06f 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1,6 +1,16 @@
 #ifndef GIT_COMPAT_UTIL_H
 #define GIT_COMPAT_UTIL_H
 
+#ifndef FLEX_ARRAY
+#if defined(__GNUC__) && (__GNUC__ < 3)
+#define FLEX_ARRAY 0
+#else
+#define FLEX_ARRAY /* empty */
+#endif
+#endif
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
+
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
@@ -55,6 +65,11 @@ extern int gitfakemunmap(void *start, size_t length);
 extern int gitsetenv(const char *, const char *, int);
 #endif
 
+#ifdef NO_UNSETENV
+#define unsetenv gitunsetenv
+extern void gitunsetenv(const char *);
+#endif
+
 #ifdef NO_STRCASESTR
 #define strcasestr gitstrcasestr
 extern char *gitstrcasestr(const char *haystack, const char *needle);
@@ -63,6 +78,8 @@ extern char *gitstrcasestr(const char *haystack, const char *needle);
 static inline void *xmalloc(size_t size)
 {
        void *ret = malloc(size);
+       if (!ret && !size)
+               ret = malloc(1);
        if (!ret)
                die("Out of memory, malloc failed");
        return ret;
@@ -71,6 +88,8 @@ static inline void *xmalloc(size_t size)
 static inline void *xrealloc(void *ptr, size_t size)
 {
        void *ret = realloc(ptr, size);
+       if (!ret && !size)
+               ret = realloc(ptr, 1);
        if (!ret)
                die("Out of memory, realloc failed");
        return ret;
@@ -79,11 +98,35 @@ static inline void *xrealloc(void *ptr, size_t size)
 static inline void *xcalloc(size_t nmemb, size_t size)
 {
        void *ret = calloc(nmemb, size);
+       if (!ret && (!nmemb || !size))
+               ret = calloc(1, 1);
        if (!ret)
                die("Out of memory, calloc failed");
        return ret;
 }
 
+static inline ssize_t xread(int fd, void *buf, size_t len)
+{
+       ssize_t nr;
+       while (1) {
+               nr = read(fd, buf, len);
+               if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                       continue;
+               return nr;
+       }
+}
+
+static inline ssize_t xwrite(int fd, const void *buf, size_t len)
+{
+       ssize_t nr;
+       while (1) {
+               nr = write(fd, buf, len);
+               if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                       continue;
+               return nr;
+       }
+}
+
 /* Sane ctype - no locale, and works with signed chars */
 #undef isspace
 #undef isdigit
@@ -110,4 +153,7 @@ static inline int sane_case(int x, int high)
        return x;
 }
 
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 256
+#endif
 #endif