1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
|
/* Create and destroy argument vectors (argv's)
Copyright (C) 1992, 2001 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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"
#define ISBLANK(ch) ((ch) == ' ' || (ch) == '\t')
/* Routines imported from standard C runtime libraries. */
#include <stddef.h>
#include <string.h>
#include <stdlib.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 **) malloc ((argc + 1) * sizeof (char *));
if (copy == NULL)
return NULL;
/* the strings */
for (argc = 0; argv[argc] != NULL; argc++)
{
int len = strlen (argv[argc]);
copy[argc] = (char *) malloc (len + 1);
if (copy[argc] == NULL)
{
freeargv (copy);
return NULL;
}
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);
}
}
/*
@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{malloc}. 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 *) 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 (ISBLANK (*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 (ISBLANK (*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 (ISBLANK (*input))
{
input++;
}
}
while (*input != EOS);
}
return (argv);
}
#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 */
|