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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)

#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;

}