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/* 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;
}
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#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 */