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git/compat/snprintf.c
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#include "../git-compat-util.h" | |
/* | |
* The size parameter specifies the available space, i.e. includes | |
* the trailing NUL byte; but Windows's vsnprintf uses the entire | |
* buffer and avoids the trailing NUL, should the buffer be exactly | |
* big enough for the result. Defining SNPRINTF_SIZE_CORR to 1 will | |
* therefore remove 1 byte from the reported buffer size, so we | |
* always have room for a trailing NUL byte. | |
*/ | |
#ifndef SNPRINTF_SIZE_CORR | |
#if defined(WIN32) && (!defined(__GNUC__) || __GNUC__ < 4) && (!defined(_MSC_VER) || _MSC_VER < 1900) | |
#define SNPRINTF_SIZE_CORR 1 | |
#else | |
#define SNPRINTF_SIZE_CORR 0 | |
#endif | |
#endif | |
#undef vsnprintf | |
int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap) | |
{ | |
va_list cp; | |
char *s; | |
int ret = -1; | |
if (maxsize > 0) { | |
va_copy(cp, ap); | |
ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, cp); | |
va_end(cp); | |
if (ret == maxsize-1) | |
ret = -1; | |
/* Windows does not NUL-terminate if result fills buffer */ | |
str[maxsize-1] = 0; | |
} | |
if (ret != -1) | |
return ret; | |
s = NULL; | |
if (maxsize < 128) | |
maxsize = 128; | |
while (ret == -1) { | |
maxsize *= 4; | |
str = realloc(s, maxsize); | |
if (! str) | |
break; | |
s = str; | |
va_copy(cp, ap); | |
ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, cp); | |
va_end(cp); | |
if (ret == maxsize-1) | |
ret = -1; | |
} | |
free(s); | |
return ret; | |
} | |
int git_snprintf(char *str, size_t maxsize, const char *format, ...) | |
{ | |
va_list ap; | |
int ret; | |
va_start(ap, format); | |
ret = git_vsnprintf(str, maxsize, format, ap); | |
va_end(ap); | |
return ret; | |
} |