568 lines
14 KiB
C
568 lines
14 KiB
C
/* Create and destroy argument vectors (argv's)
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Copyright (C) 1992-2022 Free Software Foundation, Inc.
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Written by Fred Fish @ Cygnus Support
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* Create and destroy argument vectors. An argument vector is simply an
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array of string pointers, terminated by a NULL pointer. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "ansidecl.h"
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#include "libiberty.h"
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#include "safe-ctype.h"
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/* Routines imported from standard C runtime libraries. */
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#include <stddef.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef EOS
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#define EOS '\0'
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#endif
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#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */
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/*
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@deftypefn Extension char** dupargv (char * const *@var{vector})
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Duplicate an argument vector. Simply scans through @var{vector},
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duplicating each argument until the terminating @code{NULL} is found.
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Returns a pointer to the argument vector if successful. Returns
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@code{NULL} if there is insufficient memory to complete building the
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argument vector.
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@end deftypefn
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*/
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char **
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dupargv (char * const *argv)
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{
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int argc;
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char **copy;
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if (argv == NULL)
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return NULL;
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/* the vector */
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for (argc = 0; argv[argc] != NULL; argc++);
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copy = (char **) xmalloc ((argc + 1) * sizeof (char *));
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/* the strings */
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for (argc = 0; argv[argc] != NULL; argc++)
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copy[argc] = xstrdup (argv[argc]);
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copy[argc] = NULL;
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return copy;
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}
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/*
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@deftypefn Extension void freeargv (char **@var{vector})
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Free an argument vector that was built using @code{buildargv}. Simply
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scans through @var{vector}, freeing the memory for each argument until
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the terminating @code{NULL} is found, and then frees @var{vector}
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itself.
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@end deftypefn
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*/
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void freeargv (char **vector)
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{
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register char **scan;
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if (vector != NULL)
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{
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for (scan = vector; *scan != NULL; scan++)
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{
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free (*scan);
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}
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free (vector);
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}
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}
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static void
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consume_whitespace (const char **input)
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{
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while (ISSPACE (**input))
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{
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(*input)++;
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}
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}
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static int
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only_whitespace (const char* input)
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{
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while (*input != EOS && ISSPACE (*input))
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input++;
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return (*input == EOS);
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}
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/*
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@deftypefn Extension char** buildargv (char *@var{sp})
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Given a pointer to a string, parse the string extracting fields
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separated by whitespace and optionally enclosed within either single
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or double quotes (which are stripped off), and build a vector of
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pointers to copies of the string for each field. The input string
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remains unchanged. The last element of the vector is followed by a
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@code{NULL} element.
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All of the memory for the pointer array and copies of the string
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is obtained from @code{xmalloc}. All of the memory can be returned to the
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system with the single function call @code{freeargv}, which takes the
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returned result of @code{buildargv}, as it's argument.
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Returns a pointer to the argument vector if successful. Returns
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@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient
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memory to complete building the argument vector.
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If the input is a null string (as opposed to a @code{NULL} pointer),
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then buildarg returns an argument vector that has one arg, a null
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string.
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@end deftypefn
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The memory for the argv array is dynamically expanded as necessary.
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In order to provide a working buffer for extracting arguments into,
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with appropriate stripping of quotes and translation of backslash
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sequences, we allocate a working buffer at least as long as the input
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string. This ensures that we always have enough space in which to
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work, since the extracted arg is never larger than the input string.
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The argument vector is always kept terminated with a @code{NULL} arg
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pointer, so it can be passed to @code{freeargv} at any time, or
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returned, as appropriate.
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*/
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char **buildargv (const char *input)
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{
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char *arg;
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char *copybuf;
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int squote = 0;
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int dquote = 0;
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int bsquote = 0;
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int argc = 0;
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int maxargc = 0;
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char **argv = NULL;
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char **nargv;
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if (input != NULL)
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{
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copybuf = (char *) xmalloc (strlen (input) + 1);
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/* Is a do{}while to always execute the loop once. Always return an
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argv, even for null strings. See NOTES above, test case below. */
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do
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{
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/* Pick off argv[argc] */
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consume_whitespace (&input);
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if ((maxargc == 0) || (argc >= (maxargc - 1)))
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{
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/* argv needs initialization, or expansion */
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if (argv == NULL)
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{
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maxargc = INITIAL_MAXARGC;
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nargv = (char **) xmalloc (maxargc * sizeof (char *));
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}
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else
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{
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maxargc *= 2;
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nargv = (char **) xrealloc (argv, maxargc * sizeof (char *));
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}
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argv = nargv;
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argv[argc] = NULL;
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}
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/* Begin scanning arg */
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arg = copybuf;
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while (*input != EOS)
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{
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if (ISSPACE (*input) && !squote && !dquote && !bsquote)
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{
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break;
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}
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else
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{
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if (bsquote)
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{
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bsquote = 0;
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*arg++ = *input;
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}
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else if (*input == '\\')
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{
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bsquote = 1;
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}
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else if (squote)
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{
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if (*input == '\'')
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{
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squote = 0;
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}
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else
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{
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*arg++ = *input;
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}
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}
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else if (dquote)
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{
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if (*input == '"')
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{
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dquote = 0;
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}
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else
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{
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*arg++ = *input;
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}
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}
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else
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{
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if (*input == '\'')
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{
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squote = 1;
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}
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else if (*input == '"')
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{
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dquote = 1;
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}
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else
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{
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*arg++ = *input;
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}
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}
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input++;
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}
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}
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*arg = EOS;
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argv[argc] = xstrdup (copybuf);
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argc++;
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argv[argc] = NULL;
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consume_whitespace (&input);
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}
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while (*input != EOS);
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free (copybuf);
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}
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return (argv);
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}
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/*
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@deftypefn Extension int writeargv (char * const *@var{argv}, FILE *@var{file})
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Write each member of ARGV, handling all necessary quoting, to the file
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named by FILE, separated by whitespace. Return 0 on success, non-zero
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if an error occurred while writing to FILE.
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@end deftypefn
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*/
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int
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writeargv (char * const *argv, FILE *f)
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{
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int status = 0;
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if (f == NULL)
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return 1;
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while (*argv != NULL)
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{
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const char *arg = *argv;
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while (*arg != EOS)
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{
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char c = *arg;
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if (ISSPACE(c) || c == '\\' || c == '\'' || c == '"')
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if (EOF == fputc ('\\', f))
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{
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status = 1;
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goto done;
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}
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if (EOF == fputc (c, f))
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{
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status = 1;
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goto done;
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}
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arg++;
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}
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/* Write out a pair of quotes for an empty argument. */
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if (arg == *argv)
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if (EOF == fputs ("\"\"", f))
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{
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status = 1;
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goto done;
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}
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if (EOF == fputc ('\n', f))
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{
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status = 1;
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goto done;
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}
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argv++;
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}
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done:
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return status;
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}
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/*
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@deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp})
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The @var{argcp} and @code{argvp} arguments are pointers to the usual
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@code{argc} and @code{argv} arguments to @code{main}. This function
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looks for arguments that begin with the character @samp{@@}. Any such
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arguments are interpreted as ``response files''. The contents of the
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response file are interpreted as additional command line options. In
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particular, the file is separated into whitespace-separated strings;
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each such string is taken as a command-line option. The new options
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are inserted in place of the option naming the response file, and
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@code{*argcp} and @code{*argvp} will be updated. If the value of
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@code{*argvp} is modified by this function, then the new value has
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been dynamically allocated and can be deallocated by the caller with
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@code{freeargv}. However, most callers will simply call
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@code{expandargv} near the beginning of @code{main} and allow the
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operating system to free the memory when the program exits.
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@end deftypefn
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*/
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void
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expandargv (int *argcp, char ***argvp)
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{
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/* The argument we are currently processing. */
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int i = 0;
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/* To check if ***argvp has been dynamically allocated. */
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char ** const original_argv = *argvp;
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/* Limit the number of response files that we parse in order
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to prevent infinite recursion. */
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unsigned int iteration_limit = 2000;
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/* Loop over the arguments, handling response files. We always skip
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ARGVP[0], as that is the name of the program being run. */
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while (++i < *argcp)
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{
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/* The name of the response file. */
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const char *filename;
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/* The response file. */
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FILE *f;
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/* An upper bound on the number of characters in the response
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file. */
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long pos;
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/* The number of characters in the response file, when actually
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read. */
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size_t len;
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/* A dynamically allocated buffer used to hold options read from a
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response file. */
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char *buffer;
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/* Dynamically allocated storage for the options read from the
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response file. */
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char **file_argv;
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/* The number of options read from the response file, if any. */
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size_t file_argc;
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#ifdef S_ISDIR
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struct stat sb;
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#endif
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/* We are only interested in options of the form "@file". */
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filename = (*argvp)[i];
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if (filename[0] != '@')
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continue;
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/* If we have iterated too many times then stop. */
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if (-- iteration_limit == 0)
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{
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fprintf (stderr, "%s: error: too many @-files encountered\n", (*argvp)[0]);
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xexit (1);
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}
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#ifdef S_ISDIR
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if (stat (filename+1, &sb) < 0)
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continue;
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if (S_ISDIR(sb.st_mode))
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{
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fprintf (stderr, "%s: error: @-file refers to a directory\n", (*argvp)[0]);
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xexit (1);
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}
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#endif
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/* Read the contents of the file. */
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f = fopen (++filename, "r");
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if (!f)
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continue;
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if (fseek (f, 0L, SEEK_END) == -1)
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goto error;
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pos = ftell (f);
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if (pos == -1)
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goto error;
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if (fseek (f, 0L, SEEK_SET) == -1)
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goto error;
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buffer = (char *) xmalloc (pos * sizeof (char) + 1);
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len = fread (buffer, sizeof (char), pos, f);
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if (len != (size_t) pos
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/* On Windows, fread may return a value smaller than POS,
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due to CR/LF->CR translation when reading text files.
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That does not in-and-of itself indicate failure. */
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&& ferror (f))
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{
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free (buffer);
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goto error;
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}
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/* Add a NUL terminator. */
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buffer[len] = '\0';
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/* If the file is empty or contains only whitespace, buildargv would
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return a single empty argument. In this context we want no arguments,
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instead. */
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if (only_whitespace (buffer))
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{
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file_argv = (char **) xmalloc (sizeof (char *));
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file_argv[0] = NULL;
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}
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else
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/* Parse the string. */
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file_argv = buildargv (buffer);
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/* If *ARGVP is not already dynamically allocated, copy it. */
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if (*argvp == original_argv)
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*argvp = dupargv (*argvp);
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/* Count the number of arguments. */
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file_argc = 0;
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while (file_argv[file_argc])
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++file_argc;
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/* Free the original option's memory. */
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free ((*argvp)[i]);
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/* Now, insert FILE_ARGV into ARGV. The "+1" below handles the
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NULL terminator at the end of ARGV. */
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*argvp = ((char **)
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xrealloc (*argvp,
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(*argcp + file_argc + 1) * sizeof (char *)));
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memmove (*argvp + i + file_argc, *argvp + i + 1,
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(*argcp - i) * sizeof (char *));
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memcpy (*argvp + i, file_argv, file_argc * sizeof (char *));
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/* The original option has been replaced by all the new
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options. */
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*argcp += file_argc - 1;
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/* Free up memory allocated to process the response file. We do
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not use freeargv because the individual options in FILE_ARGV
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are now in the main ARGV. */
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free (file_argv);
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free (buffer);
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/* Rescan all of the arguments just read to support response
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files that include other response files. */
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--i;
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error:
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/* We're all done with the file now. */
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fclose (f);
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}
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}
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/*
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@deftypefn Extension int countargv (char * const *@var{argv})
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Return the number of elements in @var{argv}.
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Returns zero if @var{argv} is NULL.
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@end deftypefn
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*/
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int
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countargv (char * const *argv)
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{
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int argc;
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if (argv == NULL)
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return 0;
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for (argc = 0; argv[argc] != NULL; argc++)
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continue;
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return argc;
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}
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#ifdef MAIN
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/* Simple little test driver. */
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static const char *const tests[] =
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{
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"a simple command line",
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"arg 'foo' is single quoted",
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"arg \"bar\" is double quoted",
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"arg \"foo bar\" has embedded whitespace",
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"arg 'Jack said \\'hi\\'' has single quotes",
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"arg 'Jack said \\\"hi\\\"' has double quotes",
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"a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9",
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/* This should be expanded into only one argument. */
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"trailing-whitespace ",
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"",
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NULL
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};
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int
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main (void)
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{
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char **argv;
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const char *const *test;
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char **targs;
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for (test = tests; *test != NULL; test++)
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{
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printf ("buildargv(\"%s\")\n", *test);
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if ((argv = buildargv (*test)) == NULL)
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{
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printf ("failed!\n\n");
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}
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else
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{
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for (targs = argv; *targs != NULL; targs++)
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{
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printf ("\t\"%s\"\n", *targs);
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}
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printf ("\n");
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}
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freeargv (argv);
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}
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return 0;
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}
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#endif /* MAIN */
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