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/* xasprintf.c
* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
* Copyright (C) 2020 g10 Code GmbH
*
* This file is part of GnuPG.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of either
*
* - the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* or
*
* - the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* or both in parallel, as here.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdlib.h>
#include <errno.h>
#include "util.h"
/* Same as asprintf but return an allocated buffer suitable to be
freed using xfree. This function simply dies on memory failure,
thus no extra check is required.
FIXME: We should remove these functions in favor of gpgrt_bsprintf
and a xgpgrt_bsprintf or rename them to xbsprintf and
xtrybsprintf. */
char *
xasprintf (const char *fmt, ...)
{
va_list ap;
char *buf;
va_start (ap, fmt);
if (gpgrt_vasprintf (&buf, fmt, ap) < 0)
log_fatal ("estream_asprintf failed: %s\n", strerror (errno));
va_end (ap);
return buf;
}
/* Same as above but return NULL on memory failure. */
char *
xtryasprintf (const char *fmt, ...)
{
int rc;
va_list ap;
char *buf;
va_start (ap, fmt);
rc = gpgrt_vasprintf (&buf, fmt, ap);
va_end (ap);
if (rc < 0)
return NULL;
return buf;
}
/* This is safe version of realloc useful for reallocing a calloced
* array. There are two ways to call it: The first example
* reallocates the array A to N elements each of SIZE but does not
* clear the newly allocated elements:
*
* p = xtryreallocarray (a, n, n, nsize);
*
* Note that when NOLD is larger than N no cleaning is needed anyway.
* The second example reallocates an array of size NOLD to N elements
* each of SIZE but clear the newly allocated elements:
*
* p = xtryreallocarray (a, nold, n, nsize);
*
* Note that xtryreallocarray (NULL, 0, n, nsize) is equivalent to
* xtrycalloc (n, nsize).
*
* The same function under the name gpgrt_reallocarray exists in
* libgpg-error but only since version 1.38 and thus we use a copy
* here.
*/
void *
xtryreallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size)
{
size_t oldbytes, bytes;
char *p;
bytes = nmemb * size; /* size_t is unsigned so the behavior on overflow
* is defined. */
if (size && bytes / size != nmemb)
{
gpg_err_set_errno (ENOMEM);
return NULL;
}
p = xtryrealloc (a, bytes);
if (p && oldnmemb < nmemb)
{
/* OLDNMEMBS is lower than NMEMB thus the user asked for a
calloc. Clear all newly allocated members. */
oldbytes = oldnmemb * size;
if (size && oldbytes / size != oldnmemb)
{
xfree (p);
gpg_err_set_errno (ENOMEM);
return NULL;
}
memset (p + oldbytes, 0, bytes - oldbytes);
}
return p;
}
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