97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2004 Darren Tucker.
|
||
|
|
*
|
||
|
|
* Based originally on asprintf.c from OpenBSD:
|
||
|
|
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify, and distribute this software for any
|
||
|
|
* purpose with or without fee is hereby granted, provided that the above
|
||
|
|
* copyright notice and this permission notice appear in all copies.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef HAVE_ASPRINTF
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <limits.h> /* for INT_MAX */
|
||
|
|
#include <stdarg.h>
|
||
|
|
#include <stdio.h> /* for vsnprintf */
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#ifndef VA_COPY
|
||
|
|
# ifdef HAVE_VA_COPY
|
||
|
|
# define VA_COPY(dest, src) va_copy(dest, src)
|
||
|
|
# else
|
||
|
|
# ifdef HAVE___VA_COPY
|
||
|
|
# define VA_COPY(dest, src) __va_copy(dest, src)
|
||
|
|
# else
|
||
|
|
# define VA_COPY(dest, src) (dest) = (src)
|
||
|
|
# endif
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define INIT_SZ 128
|
||
|
|
|
||
|
|
int
|
||
|
|
vasprintf(char **str, const char *fmt, va_list ap)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
va_list ap2;
|
||
|
|
char *string, *newstr;
|
||
|
|
size_t len;
|
||
|
|
|
||
|
|
if ((string = malloc(INIT_SZ)) == NULL)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
VA_COPY(ap2, ap);
|
||
|
|
ret = vsnprintf(string, INIT_SZ, fmt, ap2);
|
||
|
|
va_end(ap2);
|
||
|
|
if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
|
||
|
|
*str = string;
|
||
|
|
} else if (ret == INT_MAX || ret < 0) { /* Bad length */
|
||
|
|
free(string);
|
||
|
|
goto fail;
|
||
|
|
} else { /* bigger than initial, realloc allowing for nul */
|
||
|
|
len = (size_t)ret + 1;
|
||
|
|
if ((newstr = realloc(string, len)) == NULL) {
|
||
|
|
free(string);
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
VA_COPY(ap2, ap);
|
||
|
|
ret = vsnprintf(newstr, len, fmt, ap2);
|
||
|
|
va_end(ap2);
|
||
|
|
if (ret < 0 || (size_t)ret >= len) { /* failed with realloc'ed string */
|
||
|
|
free(newstr);
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
*str = newstr;
|
||
|
|
}
|
||
|
|
return (ret);
|
||
|
|
|
||
|
|
fail:
|
||
|
|
*str = NULL;
|
||
|
|
errno = ENOMEM;
|
||
|
|
return (-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
int asprintf(char **str, const char *fmt, ...)
|
||
|
|
{
|
||
|
|
va_list ap;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
*str = NULL;
|
||
|
|
va_start(ap, fmt);
|
||
|
|
ret = vasprintf(str, fmt, ap);
|
||
|
|
va_end(ap);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
#endif
|