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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 | * | |
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6 | * Redistribution and use in source and binary forms are permitted |
7 | * provided that the above copyright notice and this paragraph are | |
8 | * duplicated in all such forms and that any documentation, | |
9 | * advertising materials, and other materials related to such | |
10 | * distribution and use acknowledge that the software was developed | |
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11 | * by Mark Nudleman and the University of California, Berkeley. The |
12 | * name of Mark Nudleman or the | |
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13 | * University may not be used to endorse or promote products derived |
14 | * from this software without specific prior written permission. | |
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
18 | */ | |
19 | ||
20 | #ifndef lint | |
966c6ec0 | 21 | static char sccsid[] = "@(#)tags.c 5.4 (Berkeley) %G%"; |
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22 | #endif /* not lint */ |
23 | ||
966c6ec0 | 24 | #include <sys/types.h> |
bfe13c81 | 25 | #include <stdio.h> |
966c6ec0 | 26 | #include <less.h> |
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27 | |
28 | #define WHITESP(c) ((c)==' ' || (c)=='\t') | |
29 | ||
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30 | char *tagfile; |
31 | char *tagpattern; | |
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32 | |
33 | static char *tags = "tags"; | |
34 | ||
35 | extern int linenums; | |
36 | extern int sigs; | |
37 | extern char *line; | |
38 | ||
39 | /* | |
40 | * Find a tag in the "tags" file. | |
41 | * Sets "tagfile" to the name of the file containing the tag, | |
42 | * and "tagpattern" to the search pattern which should be used | |
43 | * to find the tag. | |
44 | */ | |
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45 | findtag(tag) |
46 | register char *tag; | |
47 | { | |
48 | register char *p; | |
49 | register FILE *f; | |
50 | register int taglen; | |
51 | int search_char; | |
52 | static char tline[200]; | |
53 | ||
54 | if ((f = fopen(tags, "r")) == NULL) | |
55 | { | |
56 | error("No tags file"); | |
57 | tagfile = NULL; | |
58 | return; | |
59 | } | |
60 | ||
61 | taglen = strlen(tag); | |
62 | ||
63 | /* | |
64 | * Search the tags file for the desired tag. | |
65 | */ | |
66 | while (fgets(tline, sizeof(tline), f) != NULL) | |
67 | { | |
68 | if (strncmp(tag, tline, taglen) != 0 || !WHITESP(tline[taglen])) | |
69 | continue; | |
70 | ||
71 | /* | |
72 | * Found it. | |
73 | * The line contains the tag, the filename and the | |
74 | * pattern, separated by white space. | |
75 | * The pattern is surrounded by a pair of identical | |
76 | * search characters. | |
77 | * Parse the line and extract these parts. | |
78 | */ | |
79 | tagfile = tagpattern = NULL; | |
80 | ||
81 | /* | |
82 | * Skip over the whitespace after the tag name. | |
83 | */ | |
84 | for (p = tline; !WHITESP(*p) && *p != '\0'; p++) | |
85 | continue; | |
86 | while (WHITESP(*p)) | |
87 | p++; | |
88 | if (*p == '\0') | |
89 | /* File name is missing! */ | |
90 | continue; | |
91 | ||
92 | /* | |
93 | * Save the file name. | |
94 | * Skip over the whitespace after the file name. | |
95 | */ | |
96 | tagfile = p; | |
97 | while (!WHITESP(*p) && *p != '\0') | |
98 | p++; | |
99 | *p++ = '\0'; | |
100 | while (WHITESP(*p)) | |
101 | p++; | |
102 | if (*p == '\0') | |
103 | /* Pattern is missing! */ | |
104 | continue; | |
105 | ||
106 | /* | |
107 | * Save the pattern. | |
108 | * Skip to the end of the pattern. | |
109 | * Delete the initial "^" and the final "$" from the pattern. | |
110 | */ | |
111 | search_char = *p++; | |
112 | if (*p == '^') | |
113 | p++; | |
114 | tagpattern = p; | |
115 | while (*p != search_char && *p != '\0') | |
116 | p++; | |
117 | if (p[-1] == '$') | |
118 | p--; | |
119 | *p = '\0'; | |
120 | ||
966c6ec0 | 121 | (void)fclose(f); |
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122 | return; |
123 | } | |
966c6ec0 | 124 | (void)fclose(f); |
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125 | error("No such tag in tags file"); |
126 | tagfile = NULL; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Search for a tag. | |
131 | * This is a stripped-down version of search(). | |
132 | * We don't use search() for several reasons: | |
133 | * - We don't want to blow away any search string we may have saved. | |
134 | * - The various regular-expression functions (from different systems: | |
135 | * regcmp vs. re_comp) behave differently in the presence of | |
136 | * parentheses (which are almost always found in a tag). | |
137 | */ | |
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138 | tagsearch() |
139 | { | |
966c6ec0 | 140 | off_t pos, linepos, forw_raw_line(); |
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141 | int linenum; |
142 | ||
966c6ec0 | 143 | pos = (off_t)0; |
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144 | linenum = find_linenum(pos); |
145 | ||
146 | for (;;) | |
147 | { | |
148 | /* | |
149 | * Get lines until we find a matching one or | |
150 | * until we hit end-of-file. | |
151 | */ | |
152 | if (sigs) | |
153 | return (1); | |
154 | ||
155 | /* | |
156 | * Read the next line, and save the | |
157 | * starting position of that line in linepos. | |
158 | */ | |
159 | linepos = pos; | |
160 | pos = forw_raw_line(pos); | |
161 | if (linenum != 0) | |
162 | linenum++; | |
163 | ||
164 | if (pos == NULL_POSITION) | |
165 | { | |
166 | /* | |
167 | * We hit EOF without a match. | |
168 | */ | |
169 | error("Tag not found"); | |
170 | return (1); | |
171 | } | |
172 | ||
173 | /* | |
174 | * If we're using line numbers, we might as well | |
175 | * remember the information we have now (the position | |
176 | * and line number of the current line). | |
177 | */ | |
178 | if (linenums) | |
179 | add_lnum(linenum, pos); | |
180 | ||
181 | /* | |
182 | * Test the line to see if we have a match. | |
183 | */ | |
184 | if (strcmp(tagpattern, line) == 0) | |
185 | break; | |
186 | } | |
187 | ||
188 | jump_loc(linepos); | |
189 | return (0); | |
190 | } |