File: stringlib.c

package info (click to toggle)
bash 2.05a-11
  • links: PTS
  • area: main
  • in suites: woody
  • size: 9,804 kB
  • ctags: 6,165
  • sloc: ansic: 67,305; sh: 10,832; perl: 4,105; yacc: 3,166; makefile: 3,075; asm: 48; awk: 23
file content (284 lines) | stat: -rw-r--r-- 7,210 bytes parent folder | download
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
/* stringlib.c - Miscellaneous string functions. */

/* Copyright (C) 1996
   Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 2, or (at your option) any later
   version.

   Bash 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 General Public License
   for more details.

   You should have received a copy of the GNU General Public License along
   with Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#include "config.h"

#include "bashtypes.h"

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include "bashansi.h"
#include <stdio.h>
#include "chartypes.h"

#include "shell.h"
#include "pathexp.h"

#include <glob/glob.h>

#if defined (EXTENDED_GLOB)
#  include <glob/strmatch.h>
#endif

/* **************************************************************** */
/*								    */
/*		Functions to manage arrays of strings		    */
/*								    */
/* **************************************************************** */

/* Cons up a new array of words.  The words are taken from LIST,
   which is a WORD_LIST *.  If COPY is true, everything is malloc'ed,
   so you should free everything in this array when you are done.
   The array is NULL terminated.  If IP is non-null, it gets the
   number of words in the returned array.  STARTING_INDEX says where
   to start filling in the returned array; it can be used to reserve
   space at the beginning of the array. */
char **
word_list_to_argv (list, copy, starting_index, ip)
     WORD_LIST *list;
     int copy, starting_index, *ip;
{
  int count;
  char **array;

  count = list_length (list);
  array = (char **)xmalloc ((1 + count + starting_index) * sizeof (char *));

  for (count = 0; count < starting_index; count++)
    array[count] = (char *)NULL;
  for (count = starting_index; list; count++, list = list->next)
    array[count] = copy ? savestring (list->word->word) : list->word->word;
  array[count] = (char *)NULL;

  if (ip)
    *ip = count;
  return (array);
}

/* Convert an array of strings into the form used internally by the shell.
   COPY means to copy the values in ARRAY into the returned list rather
   than allocate new storage.  STARTING_INDEX says where in ARRAY to begin. */
WORD_LIST *
argv_to_word_list (array, copy, starting_index)
     char **array;
     int copy, starting_index;
{
  WORD_LIST *list;
  WORD_DESC *w;
  int i, count;

  if (array == 0 || array[0] == 0)
    return (WORD_LIST *)NULL;

  for (count = 0; array[count]; count++)
    ;

  for (i = starting_index, list = (WORD_LIST *)NULL; i < count; i++)
    {
      w = make_bare_word (copy ? "" : array[i]);
      if (copy)
	{
	  free (w->word);
	  w->word = array[i];
	}
      list = make_word_list (w, list);
    }
  return (REVERSE_LIST(list, WORD_LIST *));
}

/* Find STRING in ALIST, a list of string key/int value pairs.  If FLAGS
   is 1, STRING is treated as a pattern and matched using strmatch. */
int
find_string_in_alist (string, alist, flags)
     char *string;
     STRING_INT_ALIST *alist;
     int flags;
{
  register int i;
  int r;

  for (i = r = 0; alist[i].word; i++)
    {
#if defined (EXTENDED_GLOB)
      if (flags)
	r = strmatch (alist[i].word, string, FNM_EXTMATCH) != FNM_NOMATCH;
      else
#endif
	r = STREQ (string, alist[i].word);

      if (r)
	return (alist[i].token);
    }
  return -1;
}

/* **************************************************************** */
/*								    */
/*		    String Management Functions			    */
/*								    */
/* **************************************************************** */

/* Replace occurrences of PAT with REP in STRING.  If GLOBAL is non-zero,
   replace all occurrences, otherwise replace only the first.
   This returns a new string; the caller should free it. */
char *
strsub (string, pat, rep, global)
     char *string, *pat, *rep;
     int global;
{
  int patlen, replen, templen, tempsize, repl, i;
  char *temp, *r;

  patlen = strlen (pat);
  replen = strlen (rep);
  for (temp = (char *)NULL, i = templen = tempsize = 0, repl = 1; string[i]; )
    {
      if (repl && STREQN (string + i, pat, patlen))
	{
	  if (replen)
	    RESIZE_MALLOCED_BUFFER (temp, templen, replen, tempsize, (replen * 2));

	  for (r = rep; *r; )
	    temp[templen++] = *r++;

	  i += patlen ? patlen : 1;	/* avoid infinite recursion */
	  repl = global != 0;
	}
      else
	{
	  RESIZE_MALLOCED_BUFFER (temp, templen, 1, tempsize, 16);
	  temp[templen++] = string[i++];
	}
    }
  temp[templen] = 0;
  return (temp);
}

/* Replace all instances of C in STRING with TEXT.  TEXT may be empty or
   NULL.  If DO_GLOB is non-zero, we quote the replacement text for
   globbing.  Backslash may be used to quote C. */
char *
strcreplace (string, c, text, do_glob)
     char *string;
     int c;
     char *text;
     int do_glob;
{
  char *ret, *p, *r, *t;
  int len, rlen, ind, tlen;

  len = STRLEN (text);
  rlen = len + strlen (string) + 2;
  ret = (char *)xmalloc (rlen);

  for (p = string, r = ret; p && *p; )
    {
      if (*p == c)
	{
	  if (len)
	    {
	      ind = r - ret;
	      if (do_glob && (glob_pattern_p (text) || strchr (text, '\\')))
		{
		  t = quote_globbing_chars (text);
		  tlen = strlen (t);
		  RESIZE_MALLOCED_BUFFER (ret, ind, tlen, rlen, rlen);
		  r = ret + ind;	/* in case reallocated */
		  strcpy (r, t);
		  r += tlen;
		  free (t);
		}
	      else
		{
		  RESIZE_MALLOCED_BUFFER (ret, ind, len, rlen, rlen);
		  r = ret + ind;	/* in case reallocated */
		  strcpy (r, text);
		  r += len;
		}
	    }
	  p++;
	  continue;
	}

      if (*p == '\\' && p[1] == c)
	p++;

      ind = r - ret;
      RESIZE_MALLOCED_BUFFER (ret, ind, 2, rlen, rlen);
      r = ret + ind;			/* in case reallocated */
      *r++ = *p++;
    }
  *r = '\0';

  return ret;
}

#ifdef INCLUDE_UNUSED
/* Remove all leading whitespace from STRING.  This includes
   newlines.  STRING should be terminated with a zero. */
void
strip_leading (string)
     char *string;
{
  char *start = string;

  while (*string && (whitespace (*string) || *string == '\n'))
    string++;

  if (string != start)
    {
      int len = strlen (string);
      FASTCOPY (string, start, len);
      start[len] = '\0';
    }
}
#endif

/* Remove all trailing whitespace from STRING.  This includes
   newlines.  If NEWLINES_ONLY is non-zero, only trailing newlines
   are removed.  STRING should be terminated with a zero. */
void
strip_trailing (string, len, newlines_only)
     char *string;
     int len;
     int newlines_only;
{
  while (len >= 0)
    {
      if ((newlines_only && string[len] == '\n') ||
	  (!newlines_only && whitespace (string[len])))
	len--;
      else
	break;
    }
  string[len + 1] = '\0';
}

/* A wrapper for bcopy that can be prototyped in general.h */
void
xbcopy (s, d, n)
     char *s, *d;
     int n;
{
  FASTCOPY (s, d, n);
}