This is argv.c in view mode; [Download] [Up]
/* Create and destroy argument vectors (argv's)
Copyright (C) 1992 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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* Create and destroy argument vectors. An argument vector is simply an
array of string pointers, terminated by a NULL pointer. */
/* AIX requires this to be the first thing in the file. */
#ifdef __GNUC__
#define alloca __builtin_alloca
#else /* not __GNUC__ */
#ifdef sparc
#include <alloca.h>
extern char *__builtin_alloca(); /* Stupid include file doesn't declare it */
#else
#ifdef _AIX
#pragma alloca
#else
char *alloca ();
#endif
#endif /* sparc */
#endif /* not __GNUC__ */
#define isspace(ch) ((ch) == ' ' || (ch) == '\t')
#include "alloca-conf.h"
#include "ansidecl.h"
#include "libiberty.h"
/* Routines imported from standard C runtime libraries. */
#ifdef __STDC__
#include <stddef.h>
extern void *memcpy (void *s1, const void *s2, size_t n); /* 4.11.2.1 */
extern size_t strlen (const char *s); /* 4.11.6.3 */
extern void *malloc (size_t size); /* 4.10.3.3 */
extern void *realloc (void *ptr, size_t size); /* 4.10.3.4 */
extern void free (void *ptr); /* 4.10.3.2 */
extern char *strdup (const char *s); /* Non-ANSI */
#else /* !__STDC__ */
extern char *memcpy (); /* Copy memory region */
extern int strlen (); /* Count length of string */
extern char *malloc (); /* Standard memory allocater */
extern char *realloc (); /* Standard memory reallocator */
extern void free (); /* Free malloc'd memory */
extern char *strdup (); /* Duplicate a string */
#endif /* __STDC__ */
#ifndef NULL
#define NULL 0
#endif
#ifndef EOS
#define EOS '\0'
#endif
#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */
/*
NAME
freeargv -- free an argument vector
SYNOPSIS
void freeargv (vector)
char **vector;
DESCRIPTION
Free an argument vector that was built using buildargv. Simply scans
through the vector, freeing the memory for each argument until the
terminating NULL is found, and then frees the vector itself.
RETURNS
No value.
*/
void freeargv (vector)
char **vector;
{
register char **scan;
if (vector != NULL)
{
for (scan = vector; *scan != NULL; scan++)
{
free (*scan);
}
free (vector);
}
}
/*
NAME
buildargv -- build an argument vector from a string
SYNOPSIS
char **buildargv (sp)
char *sp;
DESCRIPTION
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.
All of the memory for the pointer array and copies of the string
is obtained from malloc. All of the memory can be returned to the
system with the single function call freeargv, which takes the
returned result of buildargv, as it's argument.
The memory for the argv array is dynamically expanded as necessary.
RETURNS
Returns a pointer to the argument vector if successful. Returns NULL
if the input string pointer is NULL or if there is insufficient
memory to complete building the argument vector.
NOTES
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.
If the input is a null string (as opposed to a NULL pointer), then
buildarg returns an argv that has one arg, a null string.
Argv is always kept terminated with a NULL arg pointer, so it can
be passed to freeargv at any time, or returned, as appropriate.
*/
char **buildargv (input)
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 = alloca (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] */
while (isspace (*input))
{
input++;
}
if ((maxargc == 0) || (argc >= (maxargc - 1)))
{
/* argv needs initialization, or expansion */
if (argv == NULL)
{
maxargc = INITIAL_MAXARGC;
nargv = (char **) malloc (maxargc * sizeof (char *));
}
else
{
maxargc *= 2;
nargv = (char **) realloc (argv, maxargc * sizeof (char *));
}
if (nargv == NULL)
{
if (argv != NULL)
{
freeargv (argv);
argv = NULL;
}
break;
}
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] = strdup (copybuf);
if (argv[argc] == NULL)
{
freeargv (argv);
argv = NULL;
break;
}
argc++;
argv[argc] = NULL;
while (isspace (*input))
{
input++;
}
}
while (*input != EOS);
}
return (argv);
}
#ifdef MAIN
/* Simple little test driver. */
static char *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
};
main ()
{
char **argv;
char **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);
}
}
#endif /* MAIN */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.