1 /* Create and destroy argument vectors (argv's)
2 Copyright (C) 1992 Free Software Foundation, Inc.
3 Written by Fred Fish @ Cygnus Support
5 This file is part of the libiberty library.
6 Libiberty is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
11 Libiberty is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with libiberty; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Create and destroy argument vectors. An argument vector is simply an
23 array of string pointers, terminated by a NULL pointer. */
26 #include "libiberty.h"
31 #define isspace(ch) ((ch) == ' ' || (ch) == '\t')
33 /* Routines imported from standard C runtime libraries. */
43 #if !defined _WIN32 || defined __GNUC__
44 extern char *memcpy (); /* Copy memory region */
45 extern int strlen (); /* Count length of string */
46 extern char *malloc (); /* Standard memory allocater */
47 extern char *realloc (); /* Standard memory reallocator */
48 extern void free (); /* Free malloc'd memory */
49 extern char *strdup (); /* Duplicate a string */
54 #include "alloca-conf.h"
64 #define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */
71 dupargv -- duplicate an argument vector
75 char **dupargv (vector)
80 Duplicate an argument vector. Simply scans through the
81 vector, duplicating each argument until the
82 terminating NULL is found.
86 Returns a pointer to the argument vector if
87 successful. Returns NULL if there is insufficient memory to
88 complete building the argument vector.
103 for (argc
= 0; argv
[argc
] != NULL
; argc
++);
104 copy
= (char **) malloc ((argc
+ 1) * sizeof (char *));
109 for (argc
= 0; argv
[argc
] != NULL
; argc
++)
111 int len
= strlen (argv
[argc
]);
112 copy
[argc
] = malloc (sizeof (char *) * (len
+ 1));
113 if (copy
[argc
] == NULL
)
118 strcpy (copy
[argc
], argv
[argc
]);
128 freeargv -- free an argument vector
132 void freeargv (vector)
137 Free an argument vector that was built using buildargv. Simply scans
138 through the vector, freeing the memory for each argument until the
139 terminating NULL is found, and then frees the vector itself.
147 void freeargv (vector
)
150 register char **scan
;
154 for (scan
= vector
; *scan
!= NULL
; scan
++)
166 buildargv -- build an argument vector from a string
170 char **buildargv (sp)
175 Given a pointer to a string, parse the string extracting fields
176 separated by whitespace and optionally enclosed within either single
177 or double quotes (which are stripped off), and build a vector of
178 pointers to copies of the string for each field. The input string
181 All of the memory for the pointer array and copies of the string
182 is obtained from malloc. All of the memory can be returned to the
183 system with the single function call freeargv, which takes the
184 returned result of buildargv, as it's argument.
186 The memory for the argv array is dynamically expanded as necessary.
190 Returns a pointer to the argument vector if successful. Returns NULL
191 if the input string pointer is NULL or if there is insufficient
192 memory to complete building the argument vector.
196 In order to provide a working buffer for extracting arguments into,
197 with appropriate stripping of quotes and translation of backslash
198 sequences, we allocate a working buffer at least as long as the input
199 string. This ensures that we always have enough space in which to
200 work, since the extracted arg is never larger than the input string.
202 If the input is a null string (as opposed to a NULL pointer), then
203 buildarg returns an argv that has one arg, a null string.
205 Argv is always kept terminated with a NULL arg pointer, so it can
206 be passed to freeargv at any time, or returned, as appropriate.
209 char **buildargv (input
)
224 copybuf
= (char *) alloca (strlen (input
) + 1);
225 /* Is a do{}while to always execute the loop once. Always return an
226 argv, even for null strings. See NOTES above, test case below. */
229 /* Pick off argv[argc] */
230 while (isspace (*input
))
234 if ((maxargc
== 0) || (argc
>= (maxargc
- 1)))
236 /* argv needs initialization, or expansion */
239 maxargc
= INITIAL_MAXARGC
;
240 nargv
= (char **) malloc (maxargc
* sizeof (char *));
245 nargv
= (char **) realloc (argv
, maxargc
* sizeof (char *));
259 /* Begin scanning arg */
261 while (*input
!= EOS
)
263 if (isspace (*input
) && !squote
&& !dquote
&& !bsquote
)
274 else if (*input
== '\\')
306 else if (*input
== '"')
319 argv
[argc
] = strdup (copybuf
);
320 if (argv
[argc
] == NULL
)
329 while (isspace (*input
))
334 while (*input
!= EOS
);
341 /* Simple little test driver. */
343 static char *tests
[] =
345 "a simple command line",
346 "arg 'foo' is single quoted",
347 "arg \"bar\" is double quoted",
348 "arg \"foo bar\" has embedded whitespace",
349 "arg 'Jack said \\'hi\\'' has single quotes",
350 "arg 'Jack said \\\"hi\\\"' has double quotes",
351 "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",
353 /* This should be expanded into only one argument. */
354 "trailing-whitespace ",
366 for (test
= tests
; *test
!= NULL
; test
++)
368 printf ("buildargv(\"%s\")\n", *test
);
369 if ((argv
= buildargv (*test
)) == NULL
)
371 printf ("failed!\n\n");
375 for (targs
= argv
; *targs
!= NULL
; targs
++)
377 printf ("\t\"%s\"\n", *targs
);
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