57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/* SPDX-License-Identifier: MIT
|
|
* Source: https://ccodearchive.net/info/asprintf.html */
|
|
#include <ccan/asprintf/asprintf.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
|
|
char *PRINTF_FMT(1, 2) afmt(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *ptr;
|
|
|
|
va_start(ap, fmt);
|
|
/* The BSD version apparently sets ptr to NULL on fail. GNU loses. */
|
|
if (vasprintf(&ptr, fmt, ap) < 0)
|
|
ptr = NULL;
|
|
va_end(ap);
|
|
return ptr;
|
|
}
|
|
|
|
#if !HAVE_ASPRINTF
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
|
|
int vasprintf(char **strp, const char *fmt, va_list ap)
|
|
{
|
|
int len;
|
|
va_list ap_copy;
|
|
|
|
/* We need to make a copy of ap, since it's a use-once. */
|
|
va_copy(ap_copy, ap);
|
|
len = vsnprintf(NULL, 0, fmt, ap_copy);
|
|
va_end(ap_copy);
|
|
|
|
/* Until version 2.0.6 glibc would return -1 on truncated output.
|
|
* OTOH, they had asprintf. */
|
|
if (len < 0)
|
|
return -1;
|
|
|
|
*strp = malloc(len+1);
|
|
if (!*strp)
|
|
return -1;
|
|
|
|
return vsprintf(*strp, fmt, ap);
|
|
}
|
|
|
|
int asprintf(char **strp, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int len;
|
|
|
|
va_start(ap, fmt);
|
|
len = vasprintf(strp, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return len;
|
|
}
|
|
#endif /* !HAVE_ASPRINTF */
|