diff options
Diffstat (limited to 'compat/snprintf.c')
| -rw-r--r-- | compat/snprintf.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/compat/snprintf.c b/compat/snprintf.c index 6c0fb056a5..42ea1ac110 100644 --- a/compat/snprintf.c +++ b/compat/snprintf.c @@ -2,11 +2,14 @@ /* * The size parameter specifies the available space, i.e. includes - * the trailing NUL byte; but Windows's vsnprintf expects the - * number of characters to write without the trailing NUL. + * 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(__MINGW32__) && defined(__GNUC__) && __GNUC__ < 4 +#if defined(WIN32) && (!defined(__GNUC__) || __GNUC__ < 4) #define SNPRINTF_SIZE_CORR 1 #else #define SNPRINTF_SIZE_CORR 0 @@ -16,11 +19,14 @@ #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) { - ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap); + 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 */ @@ -39,7 +45,9 @@ int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap) if (! str) break; s = str; - ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap); + va_copy(cp, ap); + ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, cp); + va_end(cp); if (ret == maxsize-1) ret = -1; } |