1#include <stdint.h>
2#include <stddef.h>
3#include <stdlib.h>
4#include <stdio.h>
5#include <errno.h>
6
7FILE_LICENCE ( GPL2_OR_LATER );
8
9/**
10 * Write a formatted string to newly allocated memory.
11 *
12 * @v strp		Pointer to hold allocated string
13 * @v fmt		Format string
14 * @v args		Arguments corresponding to the format string
15 * @ret	len		Length of formatted string
16 */
17int vasprintf ( char **strp, const char *fmt, va_list args ) {
18	size_t len;
19	va_list args_tmp;
20
21	/* Calculate length needed for string */
22	va_copy ( args_tmp, args );
23	len = ( vsnprintf ( NULL, 0, fmt, args_tmp ) + 1 );
24	va_end ( args_tmp );
25
26	/* Allocate and fill string */
27	*strp = malloc ( len );
28	if ( ! *strp )
29		return -ENOMEM;
30	return vsnprintf ( *strp, len, fmt, args );
31}
32
33/**
34 * Write a formatted string to newly allocated memory.
35 *
36 * @v strp		Pointer to hold allocated string
37 * @v fmt		Format string
38 * @v ...		Arguments corresponding to the format string
39 * @ret	len		Length of formatted string
40 */
41int asprintf ( char **strp, const char *fmt, ... ) {
42	va_list args;
43	int len;
44
45	va_start ( args, fmt );
46	len = vasprintf ( strp, fmt, args );
47	va_end ( args );
48	return len;
49}
50