1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "asprintf.h"
/**
* asprintf(ret, format, ...):
* Do asprintf(3) like GNU and BSD do.
*/
int
asprintf(char ** ret, const char * format, ...)
{
va_list ap;
int len;
size_t buflen;
/* Figure out how long the string needs to be. */
va_start(ap, format);
len = vsnprintf(NULL, 0, format, ap);
va_end(ap);
/* Did we fail? */
if (len < 0)
goto err0;
buflen = (size_t)(len) + 1;
/* Allocate memory. */
if ((*ret = malloc(buflen)) == NULL)
goto err0;
/* Actually generate the string. */
va_start(ap, format);
len = vsnprintf(*ret, buflen, format, ap);
va_end(ap);
/* Did we fail? */
if (len < 0)
goto err1;
/* Success! */
return (len);
err1:
free(*ret);
err0:
/* Failure! */
return (-1);
}
|
