1
2 #ifndef _GNU_SOURCE
3
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <stdarg.h>
7
8 /* Multiplatform implementation of asprintf() from:
9 https://stackoverflow.com/questions/40159892/using-asprintf-on-windows
10 define _GNU_SOURCE to use the GNU asprintf extension instead this one.
11 */
12
13
14 #include "xasprintf.h"
15
_vscprintf_so(const char * format,va_list pargs)16 int _vscprintf_so(const char * format, va_list pargs) {
17 int retval;
18 va_list argcopy;
19 va_copy(argcopy, pargs);
20 retval = vsnprintf(NULL, 0, format, argcopy);
21 va_end(argcopy);
22 return retval;
23 }
24
vasprintf(char ** strp,const char * fmt,va_list ap)25 int vasprintf(char **strp, const char *fmt, va_list ap) {
26 int len = _vscprintf_so(fmt, ap);
27 if (len == -1) return -1;
28 char *str = malloc((size_t) len + 1);
29 if (!str) return -1;
30 int r = vsnprintf(str, len + 1, fmt, ap);
31 if (r == -1) return free(str), -1;
32 *strp = str;
33 return r;
34 }
35
asprintf(char * strp[],const char * fmt,...)36 int asprintf(char *strp[], const char *fmt, ...) {
37 va_list ap;
38 va_start(ap, fmt);
39 int r = vasprintf(strp, fmt, ap);
40 va_end(ap);
41 return r;
42 }
43
44 #endif // !_GNU_SOURCE
45
46