json-c/vasprintf_compat.h

#ifndef __vasprintf_compat_h
#define __vasprintf_compat_h

#if !defined(HAVE_VSNPRINTF) && defined(_MSC_VER)
# define vsnprintf _vsnprintf
#elif !defined(HAVE_VSNPRINTF) /* !HAVE_VSNPRINTF */
# error Need vsnprintf!
#endif /* !HAVE_VSNPRINTF && defined(WIN32) */

#if !defined(HAVE_VASPRINTF)
/* CAW: compliant version of vasprintf */
static int vasprintf(char **buf, const char *fmt, va_list ap)
{
#ifndef WIN32
	static char _T_emptybuffer = '\0';
#endif /* !defined(WIN32) */
	int chars;
	char *b;

	if(!buf) { return -1; }

#ifdef WIN32
	chars = _vscprintf(fmt, ap)+1;
#else /* !defined(WIN32) */
	/* CAW: RAWR! We have to hope to god here that vsnprintf doesn't overwrite
	   our buffer like on some 64bit sun systems.... but hey, its time to move on */
	chars = vsnprintf(&_T_emptybuffer, 0, fmt, ap)+1;
	if(chars < 0) { chars *= -1; } /* CAW: old glibc versions have this problem */
#endif /* defined(WIN32) */

	b = (char*)malloc(sizeof(char)*chars);
	if(!b) { return -1; }

	if((chars = vsprintf(b, fmt, ap)) < 0)
	{
		free(b);
	} else {
		*buf = b;
	}

	return chars;
}
#endif /* !HAVE_VASPRINTF */

#endif /* __vasprintf_compat_h */