mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
b9b64803f6
* argv.c (dupargv): Replace malloc with xmalloc. Don't check xmalloc return. (buildargv): Likewise. Also replace strdup with xstrdup. (expandargv): Don't check dupargv return.
541 lines
13 KiB
C
541 lines
13 KiB
C
/* Create and destroy argument vectors (argv's)
|
|
Copyright (C) 1992, 2001, 2010, 2012 Free Software Foundation, Inc.
|
|
Written by Fred Fish @ Cygnus Support
|
|
|
|
This file is part of the libiberty library.
|
|
Libiberty is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
Libiberty 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with libiberty; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
|
|
/* Create and destroy argument vectors. An argument vector is simply an
|
|
array of string pointers, terminated by a NULL pointer. */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
#include "ansidecl.h"
|
|
#include "libiberty.h"
|
|
#include "safe-ctype.h"
|
|
|
|
/* Routines imported from standard C runtime libraries. */
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#ifndef NULL
|
|
#define NULL 0
|
|
#endif
|
|
|
|
#ifndef EOS
|
|
#define EOS '\0'
|
|
#endif
|
|
|
|
#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */
|
|
|
|
|
|
/*
|
|
|
|
@deftypefn Extension char** dupargv (char **@var{vector})
|
|
|
|
Duplicate an argument vector. Simply scans through @var{vector},
|
|
duplicating each argument until the terminating @code{NULL} is found.
|
|
Returns a pointer to the argument vector if successful. Returns
|
|
@code{NULL} if there is insufficient memory to complete building the
|
|
argument vector.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
char **
|
|
dupargv (char **argv)
|
|
{
|
|
int argc;
|
|
char **copy;
|
|
|
|
if (argv == NULL)
|
|
return NULL;
|
|
|
|
/* the vector */
|
|
for (argc = 0; argv[argc] != NULL; argc++);
|
|
copy = (char **) xmalloc ((argc + 1) * sizeof (char *));
|
|
|
|
/* the strings */
|
|
for (argc = 0; argv[argc] != NULL; argc++)
|
|
{
|
|
int len = strlen (argv[argc]);
|
|
copy[argc] = (char *) xmalloc (len + 1);
|
|
strcpy (copy[argc], argv[argc]);
|
|
}
|
|
copy[argc] = NULL;
|
|
return copy;
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension void freeargv (char **@var{vector})
|
|
|
|
Free an argument vector that was built using @code{buildargv}. Simply
|
|
scans through @var{vector}, freeing the memory for each argument until
|
|
the terminating @code{NULL} is found, and then frees @var{vector}
|
|
itself.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
void freeargv (char **vector)
|
|
{
|
|
register char **scan;
|
|
|
|
if (vector != NULL)
|
|
{
|
|
for (scan = vector; *scan != NULL; scan++)
|
|
{
|
|
free (*scan);
|
|
}
|
|
free (vector);
|
|
}
|
|
}
|
|
|
|
static void
|
|
consume_whitespace (const char **input)
|
|
{
|
|
while (ISSPACE (**input))
|
|
{
|
|
(*input)++;
|
|
}
|
|
}
|
|
|
|
static int
|
|
only_whitespace (const char* input)
|
|
{
|
|
while (*input != EOS && ISSPACE (*input))
|
|
input++;
|
|
|
|
return (*input == EOS);
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension char** buildargv (char *@var{sp})
|
|
|
|
Given a pointer to a string, parse the string extracting fields
|
|
separated by whitespace and optionally enclosed within either single
|
|
or double quotes (which are stripped off), and build a vector of
|
|
pointers to copies of the string for each field. The input string
|
|
remains unchanged. The last element of the vector is followed by a
|
|
@code{NULL} element.
|
|
|
|
All of the memory for the pointer array and copies of the string
|
|
is obtained from @code{xmalloc}. All of the memory can be returned to the
|
|
system with the single function call @code{freeargv}, which takes the
|
|
returned result of @code{buildargv}, as it's argument.
|
|
|
|
Returns a pointer to the argument vector if successful. Returns
|
|
@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient
|
|
memory to complete building the argument vector.
|
|
|
|
If the input is a null string (as opposed to a @code{NULL} pointer),
|
|
then buildarg returns an argument vector that has one arg, a null
|
|
string.
|
|
|
|
@end deftypefn
|
|
|
|
The memory for the argv array is dynamically expanded as necessary.
|
|
|
|
In order to provide a working buffer for extracting arguments into,
|
|
with appropriate stripping of quotes and translation of backslash
|
|
sequences, we allocate a working buffer at least as long as the input
|
|
string. This ensures that we always have enough space in which to
|
|
work, since the extracted arg is never larger than the input string.
|
|
|
|
The argument vector is always kept terminated with a @code{NULL} arg
|
|
pointer, so it can be passed to @code{freeargv} at any time, or
|
|
returned, as appropriate.
|
|
|
|
*/
|
|
|
|
char **buildargv (const char *input)
|
|
{
|
|
char *arg;
|
|
char *copybuf;
|
|
int squote = 0;
|
|
int dquote = 0;
|
|
int bsquote = 0;
|
|
int argc = 0;
|
|
int maxargc = 0;
|
|
char **argv = NULL;
|
|
char **nargv;
|
|
|
|
if (input != NULL)
|
|
{
|
|
copybuf = (char *) xmalloc (strlen (input) + 1);
|
|
/* Is a do{}while to always execute the loop once. Always return an
|
|
argv, even for null strings. See NOTES above, test case below. */
|
|
do
|
|
{
|
|
/* Pick off argv[argc] */
|
|
consume_whitespace (&input);
|
|
|
|
if ((maxargc == 0) || (argc >= (maxargc - 1)))
|
|
{
|
|
/* argv needs initialization, or expansion */
|
|
if (argv == NULL)
|
|
{
|
|
maxargc = INITIAL_MAXARGC;
|
|
nargv = (char **) xmalloc (maxargc * sizeof (char *));
|
|
}
|
|
else
|
|
{
|
|
maxargc *= 2;
|
|
nargv = (char **) xrealloc (argv, maxargc * sizeof (char *));
|
|
}
|
|
argv = nargv;
|
|
argv[argc] = NULL;
|
|
}
|
|
/* Begin scanning arg */
|
|
arg = copybuf;
|
|
while (*input != EOS)
|
|
{
|
|
if (ISSPACE (*input) && !squote && !dquote && !bsquote)
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
if (bsquote)
|
|
{
|
|
bsquote = 0;
|
|
*arg++ = *input;
|
|
}
|
|
else if (*input == '\\')
|
|
{
|
|
bsquote = 1;
|
|
}
|
|
else if (squote)
|
|
{
|
|
if (*input == '\'')
|
|
{
|
|
squote = 0;
|
|
}
|
|
else
|
|
{
|
|
*arg++ = *input;
|
|
}
|
|
}
|
|
else if (dquote)
|
|
{
|
|
if (*input == '"')
|
|
{
|
|
dquote = 0;
|
|
}
|
|
else
|
|
{
|
|
*arg++ = *input;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (*input == '\'')
|
|
{
|
|
squote = 1;
|
|
}
|
|
else if (*input == '"')
|
|
{
|
|
dquote = 1;
|
|
}
|
|
else
|
|
{
|
|
*arg++ = *input;
|
|
}
|
|
}
|
|
input++;
|
|
}
|
|
}
|
|
*arg = EOS;
|
|
argv[argc] = xstrdup (copybuf);
|
|
argc++;
|
|
argv[argc] = NULL;
|
|
|
|
consume_whitespace (&input);
|
|
}
|
|
while (*input != EOS);
|
|
|
|
free (copybuf);
|
|
}
|
|
return (argv);
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension int writeargv (const char **@var{argv}, FILE *@var{file})
|
|
|
|
Write each member of ARGV, handling all necessary quoting, to the file
|
|
named by FILE, separated by whitespace. Return 0 on success, non-zero
|
|
if an error occurred while writing to FILE.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
int
|
|
writeargv (char **argv, FILE *f)
|
|
{
|
|
int status = 0;
|
|
|
|
if (f == NULL)
|
|
return 1;
|
|
|
|
while (*argv != NULL)
|
|
{
|
|
const char *arg = *argv;
|
|
|
|
while (*arg != EOS)
|
|
{
|
|
char c = *arg;
|
|
|
|
if (ISSPACE(c) || c == '\\' || c == '\'' || c == '"')
|
|
if (EOF == fputc ('\\', f))
|
|
{
|
|
status = 1;
|
|
goto done;
|
|
}
|
|
|
|
if (EOF == fputc (c, f))
|
|
{
|
|
status = 1;
|
|
goto done;
|
|
}
|
|
arg++;
|
|
}
|
|
|
|
if (EOF == fputc ('\n', f))
|
|
{
|
|
status = 1;
|
|
goto done;
|
|
}
|
|
argv++;
|
|
}
|
|
|
|
done:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp})
|
|
|
|
The @var{argcp} and @code{argvp} arguments are pointers to the usual
|
|
@code{argc} and @code{argv} arguments to @code{main}. This function
|
|
looks for arguments that begin with the character @samp{@@}. Any such
|
|
arguments are interpreted as ``response files''. The contents of the
|
|
response file are interpreted as additional command line options. In
|
|
particular, the file is separated into whitespace-separated strings;
|
|
each such string is taken as a command-line option. The new options
|
|
are inserted in place of the option naming the response file, and
|
|
@code{*argcp} and @code{*argvp} will be updated. If the value of
|
|
@code{*argvp} is modified by this function, then the new value has
|
|
been dynamically allocated and can be deallocated by the caller with
|
|
@code{freeargv}. However, most callers will simply call
|
|
@code{expandargv} near the beginning of @code{main} and allow the
|
|
operating system to free the memory when the program exits.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
void
|
|
expandargv (int *argcp, char ***argvp)
|
|
{
|
|
/* The argument we are currently processing. */
|
|
int i = 0;
|
|
/* Non-zero if ***argvp has been dynamically allocated. */
|
|
int argv_dynamic = 0;
|
|
/* Limit the number of response files that we parse in order
|
|
to prevent infinite recursion. */
|
|
unsigned int iteration_limit = 2000;
|
|
/* Loop over the arguments, handling response files. We always skip
|
|
ARGVP[0], as that is the name of the program being run. */
|
|
while (++i < *argcp)
|
|
{
|
|
/* The name of the response file. */
|
|
const char *filename;
|
|
/* The response file. */
|
|
FILE *f;
|
|
/* An upper bound on the number of characters in the response
|
|
file. */
|
|
long pos;
|
|
/* The number of characters in the response file, when actually
|
|
read. */
|
|
size_t len;
|
|
/* A dynamically allocated buffer used to hold options read from a
|
|
response file. */
|
|
char *buffer;
|
|
/* Dynamically allocated storage for the options read from the
|
|
response file. */
|
|
char **file_argv;
|
|
/* The number of options read from the response file, if any. */
|
|
size_t file_argc;
|
|
/* We are only interested in options of the form "@file". */
|
|
filename = (*argvp)[i];
|
|
if (filename[0] != '@')
|
|
continue;
|
|
/* If we have iterated too many times then stop. */
|
|
if (-- iteration_limit == 0)
|
|
{
|
|
fprintf (stderr, "%s: error: too many @-files encountered\n", (*argvp)[0]);
|
|
xexit (1);
|
|
}
|
|
/* Read the contents of the file. */
|
|
f = fopen (++filename, "r");
|
|
if (!f)
|
|
continue;
|
|
if (fseek (f, 0L, SEEK_END) == -1)
|
|
goto error;
|
|
pos = ftell (f);
|
|
if (pos == -1)
|
|
goto error;
|
|
if (fseek (f, 0L, SEEK_SET) == -1)
|
|
goto error;
|
|
buffer = (char *) xmalloc (pos * sizeof (char) + 1);
|
|
len = fread (buffer, sizeof (char), pos, f);
|
|
if (len != (size_t) pos
|
|
/* On Windows, fread may return a value smaller than POS,
|
|
due to CR/LF->CR translation when reading text files.
|
|
That does not in-and-of itself indicate failure. */
|
|
&& ferror (f))
|
|
goto error;
|
|
/* Add a NUL terminator. */
|
|
buffer[len] = '\0';
|
|
/* If the file is empty or contains only whitespace, buildargv would
|
|
return a single empty argument. In this context we want no arguments,
|
|
instead. */
|
|
if (only_whitespace (buffer))
|
|
{
|
|
file_argv = (char **) xmalloc (sizeof (char *));
|
|
file_argv[0] = NULL;
|
|
}
|
|
else
|
|
/* Parse the string. */
|
|
file_argv = buildargv (buffer);
|
|
/* If *ARGVP is not already dynamically allocated, copy it. */
|
|
if (!argv_dynamic)
|
|
*argvp = dupargv (*argvp);
|
|
/* Count the number of arguments. */
|
|
file_argc = 0;
|
|
while (file_argv[file_argc])
|
|
++file_argc;
|
|
/* Now, insert FILE_ARGV into ARGV. The "+1" below handles the
|
|
NULL terminator at the end of ARGV. */
|
|
*argvp = ((char **)
|
|
xrealloc (*argvp,
|
|
(*argcp + file_argc + 1) * sizeof (char *)));
|
|
memmove (*argvp + i + file_argc, *argvp + i + 1,
|
|
(*argcp - i) * sizeof (char *));
|
|
memcpy (*argvp + i, file_argv, file_argc * sizeof (char *));
|
|
/* The original option has been replaced by all the new
|
|
options. */
|
|
*argcp += file_argc - 1;
|
|
/* Free up memory allocated to process the response file. We do
|
|
not use freeargv because the individual options in FILE_ARGV
|
|
are now in the main ARGV. */
|
|
free (file_argv);
|
|
free (buffer);
|
|
/* Rescan all of the arguments just read to support response
|
|
files that include other response files. */
|
|
--i;
|
|
error:
|
|
/* We're all done with the file now. */
|
|
fclose (f);
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
@deftypefn Extension int countargv (char **@var{argv})
|
|
|
|
Return the number of elements in @var{argv}.
|
|
Returns zero if @var{argv} is NULL.
|
|
|
|
@end deftypefn
|
|
|
|
*/
|
|
|
|
int
|
|
countargv (char **argv)
|
|
{
|
|
int argc;
|
|
|
|
if (argv == NULL)
|
|
return 0;
|
|
for (argc = 0; argv[argc] != NULL; argc++)
|
|
continue;
|
|
return argc;
|
|
}
|
|
|
|
#ifdef MAIN
|
|
|
|
/* Simple little test driver. */
|
|
|
|
static const char *const tests[] =
|
|
{
|
|
"a simple command line",
|
|
"arg 'foo' is single quoted",
|
|
"arg \"bar\" is double quoted",
|
|
"arg \"foo bar\" has embedded whitespace",
|
|
"arg 'Jack said \\'hi\\'' has single quotes",
|
|
"arg 'Jack said \\\"hi\\\"' has double quotes",
|
|
"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",
|
|
|
|
/* This should be expanded into only one argument. */
|
|
"trailing-whitespace ",
|
|
|
|
"",
|
|
NULL
|
|
};
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
char **argv;
|
|
const char *const *test;
|
|
char **targs;
|
|
|
|
for (test = tests; *test != NULL; test++)
|
|
{
|
|
printf ("buildargv(\"%s\")\n", *test);
|
|
if ((argv = buildargv (*test)) == NULL)
|
|
{
|
|
printf ("failed!\n\n");
|
|
}
|
|
else
|
|
{
|
|
for (targs = argv; *targs != NULL; targs++)
|
|
{
|
|
printf ("\t\"%s\"\n", *targs);
|
|
}
|
|
printf ("\n");
|
|
}
|
|
freeargv (argv);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* MAIN */
|