111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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/* vasprintf and asprintf with out-of-memory checking.
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Copyright (C) 1999, 2002-2004, 2006-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "xvasprintf.h"
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#include <errno.h>
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#include <limits.h>
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#include <string.h>
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#include <stdio.h>
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#include "xalloc.h"
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/* Checked size_t computations. */
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#include "xsize.h"
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static char *
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xstrcat (size_t argcount, va_list args)
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{
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char *result;
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va_list ap;
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size_t totalsize;
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size_t i;
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char *p;
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/* Determine the total size. */
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totalsize = 0;
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va_copy (ap, args);
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for (i = argcount; i > 0; i--)
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{
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const char *next = va_arg (ap, const char *);
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totalsize = xsum (totalsize, strlen (next));
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}
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va_end (ap);
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/* Test for overflow in the summing pass above or in (totalsize + 1) below.
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Also, don't return a string longer than INT_MAX, for consistency with
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vasprintf(). */
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if (totalsize == SIZE_MAX || totalsize > INT_MAX)
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{
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errno = EOVERFLOW;
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return NULL;
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}
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/* Allocate and fill the result string. */
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result = XNMALLOC (totalsize + 1, char);
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p = result;
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for (i = argcount; i > 0; i--)
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{
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const char *next = va_arg (args, const char *);
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size_t len = strlen (next);
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memcpy (p, next, len);
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p += len;
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}
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*p = '\0';
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return result;
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}
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char *
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xvasprintf (const char *format, va_list args)
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{
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char *result;
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/* Recognize the special case format = "%s...%s". It is a frequently used
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idiom for string concatenation and needs to be fast. We don't want to
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have a separate function xstrcat() for this purpose. */
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{
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size_t argcount = 0;
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const char *f;
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for (f = format;;)
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{
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if (*f == '\0')
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/* Recognized the special case of string concatenation. */
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return xstrcat (argcount, args);
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if (*f != '%')
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break;
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f++;
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if (*f != 's')
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break;
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f++;
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argcount++;
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}
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}
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if (vasprintf (&result, format, args) < 0)
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{
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if (errno == ENOMEM)
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xalloc_die ();
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return NULL;
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}
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return result;
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}
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