Add git__fmt as an easier to use snprintf

Checking the return value of snprintf is a pain, as it must be
>= 0 and < sizeof(buffer).  git__fmt is a simple wrapper to
perform these checks.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2008-12-31 16:06:48 -08:00
parent 5690f02e87
commit 2c4b7707f7
3 changed files with 18 additions and 0 deletions

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@ -19,6 +19,7 @@
#endif
#include "cc-compat.h"
#include "git/common.h"
#include "util.h"
#include "thread-utils.h"
#include "errors.h"

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@ -1,5 +1,7 @@
#define GIT__NO_HIDE_MALLOC
#include "common.h"
#include <stdarg.h>
#include <stdio.h>
void *git__malloc(size_t n)
{
@ -25,6 +27,19 @@ char *git__strdup(const char *s)
return r;
}
int git__fmt(char *buf, size_t buf_sz, const char *fmt, ...)
{
va_list va;
int r;
va_start(va, fmt);
r = vsnprintf(buf, buf_sz, fmt, va);
va_end(va);
if (r < 0 || r >= buf_sz)
return GIT_ERROR;
return r;
}
int git__prefixcmp(const char *str, const char *prefix)
{
for (;;) {

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@ -26,6 +26,8 @@ extern char *git__strdup(const char *);
# define strdup(a) GIT__FORBID_MALLOC
#endif
extern int git__fmt(char *, size_t, const char *, ...)
GIT_FORMAT_PRINTF(3, 4);
extern int git__prefixcmp(const char *str, const char *prefix);
extern int git__suffixcmp(const char *str, const char *suffix);