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jas_tvp.c (6925B)
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1 /*
2 * Copyright (c) 2001-2002 Michael David Adams.
3 * All rights reserved.
4 */
5
6 /* __START_OF_JASPER_LICENSE__
7 *
8 * JasPer License Version 2.0
9 *
10 * Copyright (c) 1999-2000 Image Power, Inc.
11 * Copyright (c) 1999-2000 The University of British Columbia
12 * Copyright (c) 2001-2003 Michael David Adams
13 *
14 * All rights reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person (the
17 * "User") obtaining a copy of this software and associated documentation
18 * files (the "Software"), to deal in the Software without restriction,
19 * including without limitation the rights to use, copy, modify, merge,
20 * publish, distribute, and/or sell copies of the Software, and to permit
21 * persons to whom the Software is furnished to do so, subject to the
22 * following conditions:
23 *
24 * 1. The above copyright notices and this permission notice (which
25 * includes the disclaimer below) shall be included in all copies or
26 * substantial portions of the Software.
27 *
28 * 2. The name of a copyright holder shall not be used to endorse or
29 * promote products derived from the Software without specific prior
30 * written permission.
31 *
32 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
33 * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
34 * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
35 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
36 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
37 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
38 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
39 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
40 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
41 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
42 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
43 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
44 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
45 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
46 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
47 * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
48 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
49 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
50 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
51 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
52 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
53 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
54 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
55 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
56 * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
57 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
58 *
59 * __END_OF_JASPER_LICENSE__
60 */
61
62 /*
63 * Tag-Value Parser Library
64 *
65 * $Id: jas_tvp.c 1918 2005-07-24 14:12:08Z baford $
66 */
67
68 /******************************************************************************\
69 * Includes.
70 \******************************************************************************/
71
72 #include <assert.h>
73 #include <stdio.h>
74 #include <ctype.h>
75 #include <stdlib.h>
76
77 #include "jasper/jas_malloc.h"
78 #include "jasper/jas_string.h"
79 #include "jasper/jas_tvp.h"
80
81 /******************************************************************************\
82 * Macros.
83 \******************************************************************************/
84
85 /* Is the specified character valid for a tag name? */
86 #define JAS_TVP_ISTAG(x) \
87 (isalpha(x) || (x) == '_' || isdigit(x))
88
89 /******************************************************************************\
90 * Code for creating and destroying a tag-value parser.
91 \******************************************************************************/
92
93 jas_tvparser_t *jas_tvparser_create(const char *s)
94 {
95 jas_tvparser_t *tvp;
96 if (!(tvp = jas_malloc(sizeof(jas_tvparser_t)))) {
97 return 0;
98 }
99 if (!(tvp->buf = jas_strdup(s))) {
100 jas_tvparser_destroy(tvp);
101 return 0;
102 }
103 tvp->pos = tvp->buf;
104 tvp->tag = 0;
105 tvp->val = 0;
106 return tvp;
107 }
108
109 void jas_tvparser_destroy(jas_tvparser_t *tvp)
110 {
111 if (tvp->buf) {
112 jas_free(tvp->buf);
113 }
114 jas_free(tvp);
115 }
116
117 /******************************************************************************\
118 * Main parsing code.
119 \******************************************************************************/
120
121 /* Get the next tag-value pair. */
122 int jas_tvparser_next(jas_tvparser_t *tvp)
123 {
124 char *p;
125 char *tag;
126 char *val;
127
128 /* Skip any leading whitespace. */
129 p = tvp->pos;
130 while (*p != '\0' && isspace(*p)) {
131 ++p;
132 }
133
134 /* Has the end of the input data been reached? */
135 if (*p == '\0') {
136 /* No more tags are present. */
137 tvp->pos = p;
138 return 1;
139 }
140
141 /* Does the tag name begin with a valid character? */
142 if (!JAS_TVP_ISTAG(*p)) {
143 return -1;
144 }
145
146 /* Remember where the tag name begins. */
147 tag = p;
148
149 /* Find the end of the tag name. */
150 while (*p != '\0' && JAS_TVP_ISTAG(*p)) {
151 ++p;
152 }
153
154 /* Has the end of the input data been reached? */
155 if (*p == '\0') {
156 /* The value field is empty. */
157 tvp->tag = tag;
158 tvp->val = "";
159 tvp->pos = p;
160 return 0;
161 }
162
163 /* Is a value field not present? */
164 if (*p != '=') {
165 if (*p != '\0' && !isspace(*p)) {
166 return -1;
167 }
168 *p++ = '\0';
169 tvp->tag = tag;
170 tvp->val = "";
171 tvp->pos = p;
172 return 0;
173 }
174
175 *p++ = '\0';
176
177 val = p;
178 while (*p != '\0' && !isspace(*p)) {
179 ++p;
180 }
181
182 if (*p != '\0') {
183 *p++ = '\0';
184 }
185
186 tvp->pos = p;
187 tvp->tag = tag;
188 tvp->val = val;
189
190 return 0;
191 }
192
193 /******************************************************************************\
194 * Code for querying the current tag/value.
195 \******************************************************************************/
196
197 /* Get the current tag. */
198 char *jas_tvparser_gettag(jas_tvparser_t *tvp)
199 {
200 return tvp->tag;
201 }
202
203 /* Get the current value. */
204 char *jas_tvparser_getval(jas_tvparser_t *tvp)
205 {
206 return tvp->val;
207 }
208
209 /******************************************************************************\
210 * Miscellaneous code.
211 \******************************************************************************/
212
213 /* Lookup a tag by name. */
214 jas_taginfo_t *jas_taginfos_lookup(jas_taginfo_t *taginfos, const char *name)
215 {
216 jas_taginfo_t *taginfo;
217 taginfo = taginfos;
218 while (taginfo->id >= 0) {
219 if (!strcmp(taginfo->name, name)) {
220 return taginfo;
221 }
222 ++taginfo;
223 }
224 return 0;
225 }
226
227 /* This function is simply for convenience. */
228 /* One can avoid testing for the special case of a null pointer, by
229 using this function. This function never returns a null pointer. */
230 jas_taginfo_t *jas_taginfo_nonull(jas_taginfo_t *taginfo)
231 {
232 static jas_taginfo_t invalidtaginfo = {
233 -1, 0
234 };
235
236 return taginfo ? taginfo : &invalidtaginfo;
237 }