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/* $OpenBSD: asprintf.c,v 1.25 2017/03/17 14:53:08 deraadt Exp $ */
/*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include <unistd.h>
#include "local.h"
#define INITIAL_SIZE 128
int
asprintf(char **str, const char *fmt, ...)
{
int ret;
va_list ap;
FILE f;
struct __sfileext fext;
const int pgsz = getpagesize();
_FILEEXT_SETUP(&f, &fext);
f._file = -1;
f._flags = __SWR | __SSTR | __SALC;
f._bf._base = f._p = malloc(INITIAL_SIZE);
if (f._bf._base == NULL)
goto err;
f._bf._size = f._w = INITIAL_SIZE - 1; /* leave room for the NUL */
va_start(ap, fmt);
ret = __vfprintf(&f, fmt, ap);
va_end(ap);
if (ret == -1)
goto err;
*f._p = '\0';
if (ret + 1 > INITIAL_SIZE && ret + 1 < pgsz / 2) {
/* midsize allocations can try to conserve memory */
unsigned char *_base = recallocarray(f._bf._base,
f._bf._size + 1, ret + 1, 1);
if (_base == NULL)
goto err;
*str = (char *)_base;
} else
*str = (char *)f._bf._base;
return (ret);
err:
free(f._bf._base);
f._bf._base = NULL;
*str = NULL;
errno = ENOMEM;
return (-1);
}
DEF_WEAK(asprintf);
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