#include <stdarg.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "StringUtils.h"
#include "xmalloc.h"

/*	Print to a memory buffer and allocate a larger one as needed.
	If return is != buf, we allocated, and the caller must free. */
char       *
mvprintf(char *mybuf, unsigned len, const char *format, va_list va)
{
	int         maxlen;
	int         ret;
	char       *buf;

	assert(mybuf != NULL);
	maxlen = len;
	buf = mybuf;

	/*  return of -1 indicates buffer is in old standards;
	   return of val >= maxlen indicates buffer is too small in C9X */
	ret = vsnprintf(buf, maxlen, format, va);
	if (ret < 0) {
		do {
			if (buf != mybuf)
				free(buf);
			maxlen <<= 1;
			//if (maxlen >= 65536)      /* prolly an error */
			//  return NULL;
			buf = (char *) xmalloc(maxlen);
		} while ((ret = vsnprintf(buf, maxlen, format, va)) < 0);
	} else if (ret > maxlen) {
		maxlen = ret + 1;
		buf = (char *) xmalloc(maxlen);
		ret = vsnprintf(buf, maxlen, format, va);
	}

	return buf;
}

char       *
mprintf(char *mybuf, unsigned len, const char *format, ...)
{
	va_list     va;
	char       *ret;

	va_start(va, format);
	ret = mvprintf(mybuf, len, format, va);
	va_end(va);

	return ret;
}