Mercurial > gnulib
view lib/xvasprintf.c @ 40198:5a34193cbc07
long-options: add parse_gnu_standard_options_only
Discussed in https://bugs.gnu.org/33468 .
* lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead
of 0.
(parse_gnu_standard_options_only): Add function to
process the GNU default options --help and --version and fail for any other
unknown long or short option. See
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html .
* lib/long-options.h (parse_gnu_standard_options_only): Declare it.
* modules/long-options (depends-on): Add stdbool, exitfail.
* top/maint.mk (sc_prohibit_long_options_without_use): Update
syntax-check rule, add new function name.
author | Bernhard Voelker <mail@bernhard-voelker.de> |
---|---|
date | Thu, 29 Nov 2018 09:06:26 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* vasprintf and asprintf with out-of-memory checking. Copyright (C) 1999, 2002-2004, 2006-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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> /* Specification. */ #include "xvasprintf.h" #include <errno.h> #include <limits.h> #include <string.h> #include <stdio.h> #include "xalloc.h" /* Checked size_t computations. */ #include "xsize.h" static char * xstrcat (size_t argcount, va_list args) { char *result; va_list ap; size_t totalsize; size_t i; char *p; /* Determine the total size. */ totalsize = 0; va_copy (ap, args); for (i = argcount; i > 0; i--) { const char *next = va_arg (ap, const char *); totalsize = xsum (totalsize, strlen (next)); } va_end (ap); /* Test for overflow in the summing pass above or in (totalsize + 1) below. Also, don't return a string longer than INT_MAX, for consistency with vasprintf(). */ if (totalsize == SIZE_MAX || totalsize > INT_MAX) { errno = EOVERFLOW; return NULL; } /* Allocate and fill the result string. */ result = XNMALLOC (totalsize + 1, char); p = result; for (i = argcount; i > 0; i--) { const char *next = va_arg (args, const char *); size_t len = strlen (next); memcpy (p, next, len); p += len; } *p = '\0'; return result; } char * xvasprintf (const char *format, va_list args) { char *result; /* Recognize the special case format = "%s...%s". It is a frequently used idiom for string concatenation and needs to be fast. We don't want to have a separate function xstrcat() for this purpose. */ { size_t argcount = 0; const char *f; for (f = format;;) { if (*f == '\0') /* Recognized the special case of string concatenation. */ return xstrcat (argcount, args); if (*f != '%') break; f++; if (*f != 's') break; f++; argcount++; } } if (vasprintf (&result, format, args) < 0) { if (errno == ENOMEM) xalloc_die (); return NULL; } return result; }