/[svn]/ircd-hybrid-7.2/libltdl/argz.c
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Contents of /ircd-hybrid-7.2/libltdl/argz.c

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Revision 945 - (show annotations)
Mon Jul 20 15:48:27 2009 UTC (10 years, 1 month ago) by michael
File MIME type: text/x-chdr
File size: 5903 byte(s)
- fixed some configure mess and imported latest libtool sources

1 /* argz.c -- argz implementation for non-glibc systems
2
3 Copyright (C) 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
4 Written by Gary V. Vaughan, 2004
5
6 NOTE: The canonical source of this file is maintained with the
7 GNU Libtool package. Report bugs to bug-libtool@gnu.org.
8
9 GNU Libltdl is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2 of the License, or (at your option) any later version.
13
14 As a special exception to the GNU Lesser General Public License,
15 if you distribute this file as part of a program or library that
16 is built using GNU Libtool, you may include this file under the
17 same distribution terms that you use for the rest of that program.
18
19 GNU Libltdl is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU Lesser General Public License for more details.
23
24 You should have received a copy of the GNU Lesser General Public
25 License along with GNU Libltdl; see the file COPYING.LIB. If not, a
26 copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
27 or obtained by writing to the Free Software Foundation, Inc.,
28 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 */
30
31 #if defined(LTDL) && defined LT_CONFIG_H
32 # include LT_CONFIG_H
33 #else
34 # include <config.h>
35 #endif
36
37 #include <argz.h>
38
39 #include <assert.h>
40 #include <stddef.h>
41 #include <stdlib.h>
42 #include <sys/types.h>
43 #include <errno.h>
44 #include <string.h>
45
46 #define EOS_CHAR '\0'
47
48 error_t
49 argz_append (char **pargz, size_t *pargz_len, const char *buf, size_t buf_len)
50 {
51 size_t argz_len;
52 char *argz;
53
54 assert (pargz);
55 assert (pargz_len);
56 assert ((*pargz && *pargz_len) || (!*pargz && !*pargz_len));
57
58 /* If nothing needs to be appended, no more work is required. */
59 if (buf_len == 0)
60 return 0;
61
62 /* Ensure there is enough room to append BUF_LEN. */
63 argz_len = *pargz_len + buf_len;
64 argz = (char *) realloc (*pargz, argz_len);
65 if (!argz)
66 return ENOMEM;
67
68 /* Copy characters from BUF after terminating '\0' in ARGZ. */
69 memcpy (argz + *pargz_len, buf, buf_len);
70
71 /* Assign new values. */
72 *pargz = argz;
73 *pargz_len = argz_len;
74
75 return 0;
76 }
77
78
79 error_t
80 argz_create_sep (const char *str, int delim, char **pargz, size_t *pargz_len)
81 {
82 size_t argz_len;
83 char *argz = 0;
84
85 assert (str);
86 assert (pargz);
87 assert (pargz_len);
88
89 /* Make a copy of STR, but replacing each occurrence of
90 DELIM with '\0'. */
91 argz_len = 1+ strlen (str);
92 if (argz_len)
93 {
94 const char *p;
95 char *q;
96
97 argz = (char *) malloc (argz_len);
98 if (!argz)
99 return ENOMEM;
100
101 for (p = str, q = argz; *p != EOS_CHAR; ++p)
102 {
103 if (*p == delim)
104 {
105 /* Ignore leading delimiters, and fold consecutive
106 delimiters in STR into a single '\0' in ARGZ. */
107 if ((q > argz) && (q[-1] != EOS_CHAR))
108 *q++ = EOS_CHAR;
109 else
110 --argz_len;
111 }
112 else
113 *q++ = *p;
114 }
115 /* Copy terminating EOS_CHAR. */
116 *q = *p;
117 }
118
119 /* If ARGZ_LEN has shrunk to nothing, release ARGZ's memory. */
120 if (!argz_len)
121 argz = (free (argz), (char *) 0);
122
123 /* Assign new values. */
124 *pargz = argz;
125 *pargz_len = argz_len;
126
127 return 0;
128 }
129
130
131 error_t
132 argz_insert (char **pargz, size_t *pargz_len, char *before, const char *entry)
133 {
134 assert (pargz);
135 assert (pargz_len);
136 assert (entry && *entry);
137
138 /* No BEFORE address indicates ENTRY should be inserted after the
139 current last element. */
140 if (!before)
141 return argz_append (pargz, pargz_len, entry, 1+ strlen (entry));
142
143 /* This probably indicates a programmer error, but to preserve
144 semantics, scan back to the start of an entry if BEFORE points
145 into the middle of it. */
146 while ((before > *pargz) && (before[-1] != EOS_CHAR))
147 --before;
148
149 {
150 size_t entry_len = 1+ strlen (entry);
151 size_t argz_len = *pargz_len + entry_len;
152 size_t offset = before - *pargz;
153 char *argz = (char *) realloc (*pargz, argz_len);
154
155 if (!argz)
156 return ENOMEM;
157
158 /* Make BEFORE point to the equivalent offset in ARGZ that it
159 used to have in *PARGZ incase realloc() moved the block. */
160 before = argz + offset;
161
162 /* Move the ARGZ entries starting at BEFORE up into the new
163 space at the end -- making room to copy ENTRY into the
164 resulting gap. */
165 memmove (before + entry_len, before, *pargz_len - offset);
166 memcpy (before, entry, entry_len);
167
168 /* Assign new values. */
169 *pargz = argz;
170 *pargz_len = argz_len;
171 }
172
173 return 0;
174 }
175
176
177 char *
178 argz_next (char *argz, size_t argz_len, const char *entry)
179 {
180 assert ((argz && argz_len) || (!argz && !argz_len));
181
182 if (entry)
183 {
184 /* Either ARGZ/ARGZ_LEN is empty, or ENTRY points into an address
185 within the ARGZ vector. */
186 assert ((!argz && !argz_len)
187 || ((argz <= entry) && (entry < (argz + argz_len))));
188
189 /* Move to the char immediately after the terminating
190 '\0' of ENTRY. */
191 entry = 1+ strchr (entry, EOS_CHAR);
192
193 /* Return either the new ENTRY, or else NULL if ARGZ is
194 exhausted. */
195 return (entry >= argz + argz_len) ? 0 : (char *) entry;
196 }
197 else
198 {
199 /* This should probably be flagged as a programmer error,
200 since starting an argz_next loop with the iterator set
201 to ARGZ is safer. To preserve semantics, handle the NULL
202 case by returning the start of ARGZ (if any). */
203 if (argz_len > 0)
204 return argz;
205 else
206 return 0;
207 }
208 }
209
210
211 void
212 argz_stringify (char *argz, size_t argz_len, int sep)
213 {
214 assert ((argz && argz_len) || (!argz && !argz_len));
215
216 if (sep)
217 {
218 --argz_len; /* don't stringify the terminating EOS */
219 while (--argz_len > 0)
220 {
221 if (argz[argz_len] == EOS_CHAR)
222 argz[argz_len] = sep;
223 }
224 }
225 }
226

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