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ccc6cda3 JA |
1 | /* stringlib.c - Miscellaneous string functions. */ |
2 | ||
3185942a | 3 | /* Copyright (C) 1996-2009 Free Software Foundation, Inc. |
ccc6cda3 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
ccc6cda3 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
ccc6cda3 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
ccc6cda3 JA |
20 | |
21 | #include "config.h" | |
22 | ||
23 | #include "bashtypes.h" | |
24 | ||
25 | #if defined (HAVE_UNISTD_H) | |
26 | # include <unistd.h> | |
27 | #endif | |
28 | ||
29 | #include "bashansi.h" | |
30 | #include <stdio.h> | |
f73dda09 | 31 | #include "chartypes.h" |
ccc6cda3 JA |
32 | |
33 | #include "shell.h" | |
bb70624e JA |
34 | #include "pathexp.h" |
35 | ||
f73dda09 JA |
36 | #include <glob/glob.h> |
37 | ||
bb70624e | 38 | #if defined (EXTENDED_GLOB) |
f73dda09 | 39 | # include <glob/strmatch.h> |
bb70624e | 40 | #endif |
ccc6cda3 | 41 | |
ccc6cda3 JA |
42 | /* **************************************************************** */ |
43 | /* */ | |
44 | /* Functions to manage arrays of strings */ | |
45 | /* */ | |
46 | /* **************************************************************** */ | |
47 | ||
7117c2d2 JA |
48 | /* Find STRING in ALIST, a list of string key/int value pairs. If FLAGS |
49 | is 1, STRING is treated as a pattern and matched using strmatch. */ | |
50 | int | |
51 | find_string_in_alist (string, alist, flags) | |
52 | char *string; | |
53 | STRING_INT_ALIST *alist; | |
54 | int flags; | |
ccc6cda3 | 55 | { |
7117c2d2 JA |
56 | register int i; |
57 | int r; | |
ccc6cda3 | 58 | |
7117c2d2 JA |
59 | for (i = r = 0; alist[i].word; i++) |
60 | { | |
61 | #if defined (EXTENDED_GLOB) | |
62 | if (flags) | |
63 | r = strmatch (alist[i].word, string, FNM_EXTMATCH) != FNM_NOMATCH; | |
64 | else | |
65 | #endif | |
66 | r = STREQ (string, alist[i].word); | |
ccc6cda3 | 67 | |
7117c2d2 JA |
68 | if (r) |
69 | return (alist[i].token); | |
70 | } | |
71 | return -1; | |
ccc6cda3 JA |
72 | } |
73 | ||
7117c2d2 JA |
74 | /* Find TOKEN in ALIST, a list of string/int value pairs. Return the |
75 | corresponding string. Allocates memory for the returned | |
76 | string. FLAGS is currently ignored, but reserved. */ | |
77 | char * | |
78 | find_token_in_alist (token, alist, flags) | |
79 | int token; | |
80 | STRING_INT_ALIST *alist; | |
81 | int flags; | |
ccc6cda3 | 82 | { |
7117c2d2 | 83 | register int i; |
ccc6cda3 | 84 | |
7117c2d2 | 85 | for (i = 0; alist[i].word; i++) |
ccc6cda3 | 86 | { |
7117c2d2 JA |
87 | if (alist[i].token == token) |
88 | return (savestring (alist[i].word)); | |
ccc6cda3 | 89 | } |
7117c2d2 | 90 | return ((char *)NULL); |
ccc6cda3 JA |
91 | } |
92 | ||
bb70624e | 93 | int |
7117c2d2 | 94 | find_index_in_alist (string, alist, flags) |
bb70624e JA |
95 | char *string; |
96 | STRING_INT_ALIST *alist; | |
97 | int flags; | |
98 | { | |
99 | register int i; | |
100 | int r; | |
101 | ||
102 | for (i = r = 0; alist[i].word; i++) | |
103 | { | |
104 | #if defined (EXTENDED_GLOB) | |
105 | if (flags) | |
f73dda09 | 106 | r = strmatch (alist[i].word, string, FNM_EXTMATCH) != FNM_NOMATCH; |
bb70624e JA |
107 | else |
108 | #endif | |
28ef6c31 | 109 | r = STREQ (string, alist[i].word); |
bb70624e JA |
110 | |
111 | if (r) | |
7117c2d2 | 112 | return (i); |
bb70624e | 113 | } |
7117c2d2 | 114 | |
bb70624e JA |
115 | return -1; |
116 | } | |
117 | ||
ccc6cda3 JA |
118 | /* **************************************************************** */ |
119 | /* */ | |
120 | /* String Management Functions */ | |
121 | /* */ | |
122 | /* **************************************************************** */ | |
123 | ||
7117c2d2 JA |
124 | /* Cons a new string from STRING starting at START and ending at END, |
125 | not including END. */ | |
126 | char * | |
127 | substring (string, start, end) | |
0001803f | 128 | const char *string; |
7117c2d2 JA |
129 | int start, end; |
130 | { | |
131 | register int len; | |
132 | register char *result; | |
133 | ||
134 | len = end - start; | |
135 | result = (char *)xmalloc (len + 1); | |
ac50fbac | 136 | memcpy (result, string + start, len); |
7117c2d2 JA |
137 | result[len] = '\0'; |
138 | return (result); | |
139 | } | |
140 | ||
ccc6cda3 JA |
141 | /* Replace occurrences of PAT with REP in STRING. If GLOBAL is non-zero, |
142 | replace all occurrences, otherwise replace only the first. | |
143 | This returns a new string; the caller should free it. */ | |
144 | char * | |
145 | strsub (string, pat, rep, global) | |
146 | char *string, *pat, *rep; | |
147 | int global; | |
148 | { | |
74091dd4 CR |
149 | size_t patlen, replen, templen, tempsize, i; |
150 | int repl; | |
ccc6cda3 JA |
151 | char *temp, *r; |
152 | ||
153 | patlen = strlen (pat); | |
cce855bc | 154 | replen = strlen (rep); |
ccc6cda3 JA |
155 | for (temp = (char *)NULL, i = templen = tempsize = 0, repl = 1; string[i]; ) |
156 | { | |
157 | if (repl && STREQN (string + i, pat, patlen)) | |
28ef6c31 | 158 | { |
f73dda09 JA |
159 | if (replen) |
160 | RESIZE_MALLOCED_BUFFER (temp, templen, replen, tempsize, (replen * 2)); | |
ccc6cda3 | 161 | |
ac50fbac | 162 | for (r = rep; *r; ) /* can rep == "" */ |
ccc6cda3 JA |
163 | temp[templen++] = *r++; |
164 | ||
f73dda09 | 165 | i += patlen ? patlen : 1; /* avoid infinite recursion */ |
ccc6cda3 | 166 | repl = global != 0; |
28ef6c31 | 167 | } |
ccc6cda3 JA |
168 | else |
169 | { | |
170 | RESIZE_MALLOCED_BUFFER (temp, templen, 1, tempsize, 16); | |
171 | temp[templen++] = string[i++]; | |
172 | } | |
173 | } | |
3185942a JA |
174 | if (temp) |
175 | temp[templen] = 0; | |
176 | else | |
177 | temp = savestring (string); | |
ccc6cda3 JA |
178 | return (temp); |
179 | } | |
180 | ||
bb70624e | 181 | /* Replace all instances of C in STRING with TEXT. TEXT may be empty or |
74091dd4 CR |
182 | NULL. If (FLAGS & 1) is non-zero, we quote the replacement text for |
183 | globbing. Backslash may be used to quote C. If (FLAGS & 2) we allow | |
184 | backslash to escape backslash as well. */ | |
bb70624e | 185 | char * |
74091dd4 | 186 | strcreplace (string, c, text, flags) |
bb70624e JA |
187 | char *string; |
188 | int c; | |
a0c0a00f | 189 | const char *text; |
74091dd4 | 190 | int flags; |
bb70624e JA |
191 | { |
192 | char *ret, *p, *r, *t; | |
74091dd4 CR |
193 | size_t len, rlen, ind, tlen; |
194 | int do_glob, escape_backslash; | |
195 | ||
196 | do_glob = flags & 1; | |
197 | escape_backslash = flags & 2; | |
bb70624e JA |
198 | |
199 | len = STRLEN (text); | |
200 | rlen = len + strlen (string) + 2; | |
f73dda09 | 201 | ret = (char *)xmalloc (rlen); |
bb70624e JA |
202 | |
203 | for (p = string, r = ret; p && *p; ) | |
204 | { | |
205 | if (*p == c) | |
206 | { | |
207 | if (len) | |
208 | { | |
209 | ind = r - ret; | |
210 | if (do_glob && (glob_pattern_p (text) || strchr (text, '\\'))) | |
211 | { | |
212 | t = quote_globbing_chars (text); | |
213 | tlen = strlen (t); | |
214 | RESIZE_MALLOCED_BUFFER (ret, ind, tlen, rlen, rlen); | |
215 | r = ret + ind; /* in case reallocated */ | |
216 | strcpy (r, t); | |
217 | r += tlen; | |
218 | free (t); | |
219 | } | |
220 | else | |
221 | { | |
222 | RESIZE_MALLOCED_BUFFER (ret, ind, len, rlen, rlen); | |
223 | r = ret + ind; /* in case reallocated */ | |
224 | strcpy (r, text); | |
225 | r += len; | |
226 | } | |
227 | } | |
228 | p++; | |
229 | continue; | |
230 | } | |
231 | ||
28ef6c31 | 232 | if (*p == '\\' && p[1] == c) |
bb70624e | 233 | p++; |
74091dd4 CR |
234 | else if (escape_backslash && *p == '\\' && p[1] == '\\') |
235 | p++; | |
bb70624e | 236 | |
f73dda09 | 237 | ind = r - ret; |
28ef6c31 JA |
238 | RESIZE_MALLOCED_BUFFER (ret, ind, 2, rlen, rlen); |
239 | r = ret + ind; /* in case reallocated */ | |
bb70624e JA |
240 | *r++ = *p++; |
241 | } | |
242 | *r = '\0'; | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
d166f048 | 247 | #ifdef INCLUDE_UNUSED |
ccc6cda3 JA |
248 | /* Remove all leading whitespace from STRING. This includes |
249 | newlines. STRING should be terminated with a zero. */ | |
250 | void | |
251 | strip_leading (string) | |
252 | char *string; | |
253 | { | |
254 | char *start = string; | |
255 | ||
256 | while (*string && (whitespace (*string) || *string == '\n')) | |
257 | string++; | |
258 | ||
259 | if (string != start) | |
260 | { | |
261 | int len = strlen (string); | |
262 | FASTCOPY (string, start, len); | |
263 | start[len] = '\0'; | |
264 | } | |
265 | } | |
d166f048 | 266 | #endif |
ccc6cda3 JA |
267 | |
268 | /* Remove all trailing whitespace from STRING. This includes | |
269 | newlines. If NEWLINES_ONLY is non-zero, only trailing newlines | |
270 | are removed. STRING should be terminated with a zero. */ | |
271 | void | |
d166f048 | 272 | strip_trailing (string, len, newlines_only) |
ccc6cda3 | 273 | char *string; |
d166f048 | 274 | int len; |
ccc6cda3 JA |
275 | int newlines_only; |
276 | { | |
ccc6cda3 JA |
277 | while (len >= 0) |
278 | { | |
279 | if ((newlines_only && string[len] == '\n') || | |
28ef6c31 JA |
280 | (!newlines_only && whitespace (string[len]))) |
281 | len--; | |
ccc6cda3 | 282 | else |
28ef6c31 | 283 | break; |
ccc6cda3 JA |
284 | } |
285 | string[len + 1] = '\0'; | |
286 | } | |
287 | ||
ccc6cda3 JA |
288 | /* A wrapper for bcopy that can be prototyped in general.h */ |
289 | void | |
290 | xbcopy (s, d, n) | |
291 | char *s, *d; | |
292 | int n; | |
293 | { | |
294 | FASTCOPY (s, d, n); | |
295 | } |