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1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
3 | * Copyright (c) 1988 Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. All advertising materials mentioning features or use of this software | |
15 | * must display the following acknowledgement: | |
16 | * This product includes software developed by the University of | |
17 | * California, Berkeley and its contributors. | |
18 | * 4. Neither the name of the University nor the names of its contributors | |
19 | * may be used to endorse or promote products derived from this software | |
20 | * without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | */ | |
34 | ||
35 | #ifndef lint | |
36 | static char sccsid[] = "@(#)tags.c 5.5 (Berkeley) 6/1/90"; | |
37 | #endif /* not lint */ | |
38 | ||
39 | #include <sys/types.h> | |
40 | #include <stdio.h> | |
41 | #include <less.h> | |
42 | ||
43 | #define WHITESP(c) ((c)==' ' || (c)=='\t') | |
44 | ||
45 | char *tagfile; | |
46 | char *tagpattern; | |
47 | ||
48 | static char *tags = "tags"; | |
49 | ||
50 | extern int linenums; | |
51 | extern int sigs; | |
52 | extern char *line; | |
53 | ||
54 | /* | |
55 | * Find a tag in the "tags" file. | |
56 | * Sets "tagfile" to the name of the file containing the tag, | |
57 | * and "tagpattern" to the search pattern which should be used | |
58 | * to find the tag. | |
59 | */ | |
60 | findtag(tag) | |
61 | register char *tag; | |
62 | { | |
63 | register char *p; | |
64 | register FILE *f; | |
65 | register int taglen; | |
66 | int search_char; | |
67 | static char tline[200]; | |
68 | ||
69 | if ((f = fopen(tags, "r")) == NULL) | |
70 | { | |
71 | error("No tags file"); | |
72 | tagfile = NULL; | |
73 | return; | |
74 | } | |
75 | ||
76 | taglen = strlen(tag); | |
77 | ||
78 | /* | |
79 | * Search the tags file for the desired tag. | |
80 | */ | |
81 | while (fgets(tline, sizeof(tline), f) != NULL) | |
82 | { | |
83 | if (strncmp(tag, tline, taglen) != 0 || !WHITESP(tline[taglen])) | |
84 | continue; | |
85 | ||
86 | /* | |
87 | * Found it. | |
88 | * The line contains the tag, the filename and the | |
89 | * pattern, separated by white space. | |
90 | * The pattern is surrounded by a pair of identical | |
91 | * search characters. | |
92 | * Parse the line and extract these parts. | |
93 | */ | |
94 | tagfile = tagpattern = NULL; | |
95 | ||
96 | /* | |
97 | * Skip over the whitespace after the tag name. | |
98 | */ | |
99 | for (p = tline; !WHITESP(*p) && *p != '\0'; p++) | |
100 | continue; | |
101 | while (WHITESP(*p)) | |
102 | p++; | |
103 | if (*p == '\0') | |
104 | /* File name is missing! */ | |
105 | continue; | |
106 | ||
107 | /* | |
108 | * Save the file name. | |
109 | * Skip over the whitespace after the file name. | |
110 | */ | |
111 | tagfile = p; | |
112 | while (!WHITESP(*p) && *p != '\0') | |
113 | p++; | |
114 | *p++ = '\0'; | |
115 | while (WHITESP(*p)) | |
116 | p++; | |
117 | if (*p == '\0') | |
118 | /* Pattern is missing! */ | |
119 | continue; | |
120 | ||
121 | /* | |
122 | * Save the pattern. | |
123 | * Skip to the end of the pattern. | |
124 | * Delete the initial "^" and the final "$" from the pattern. | |
125 | */ | |
126 | search_char = *p++; | |
127 | if (*p == '^') | |
128 | p++; | |
129 | tagpattern = p; | |
130 | while (*p != search_char && *p != '\0') | |
131 | p++; | |
132 | if (p[-1] == '$') | |
133 | p--; | |
134 | *p = '\0'; | |
135 | ||
136 | (void)fclose(f); | |
137 | return; | |
138 | } | |
139 | (void)fclose(f); | |
140 | error("No such tag in tags file"); | |
141 | tagfile = NULL; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Search for a tag. | |
146 | * This is a stripped-down version of search(). | |
147 | * We don't use search() for several reasons: | |
148 | * - We don't want to blow away any search string we may have saved. | |
149 | * - The various regular-expression functions (from different systems: | |
150 | * regcmp vs. re_comp) behave differently in the presence of | |
151 | * parentheses (which are almost always found in a tag). | |
152 | */ | |
153 | tagsearch() | |
154 | { | |
155 | off_t pos, linepos, forw_raw_line(); | |
156 | int linenum; | |
157 | ||
158 | pos = (off_t)0; | |
159 | linenum = find_linenum(pos); | |
160 | ||
161 | for (;;) | |
162 | { | |
163 | /* | |
164 | * Get lines until we find a matching one or | |
165 | * until we hit end-of-file. | |
166 | */ | |
167 | if (sigs) | |
168 | return (1); | |
169 | ||
170 | /* | |
171 | * Read the next line, and save the | |
172 | * starting position of that line in linepos. | |
173 | */ | |
174 | linepos = pos; | |
175 | pos = forw_raw_line(pos); | |
176 | if (linenum != 0) | |
177 | linenum++; | |
178 | ||
179 | if (pos == NULL_POSITION) | |
180 | { | |
181 | /* | |
182 | * We hit EOF without a match. | |
183 | */ | |
184 | error("Tag not found"); | |
185 | return (1); | |
186 | } | |
187 | ||
188 | /* | |
189 | * If we're using line numbers, we might as well | |
190 | * remember the information we have now (the position | |
191 | * and line number of the current line). | |
192 | */ | |
193 | if (linenums) | |
194 | add_lnum(linenum, pos); | |
195 | ||
196 | /* | |
197 | * Test the line to see if we have a match. | |
198 | */ | |
199 | if (strcmp(tagpattern, line) == 0) | |
200 | break; | |
201 | } | |
202 | ||
203 | jump_loc(linepos); | |
204 | return (0); | |
205 | } |