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1 | /* |
2 | * Copyright (c) 1988 Mark Nudleman | |
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3 | * Copyright (c) 1988, 1993 |
4 | * The Regents of the University of California. All rights reserved. | |
bfe13c81 | 5 | * |
f15db449 | 6 | * %sccs.include.redist.c% |
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7 | */ |
8 | ||
9 | #ifndef lint | |
1e3ab5ee | 10 | static char sccsid[] = "@(#)tags.c 8.1 (Berkeley) %G%"; |
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11 | #endif /* not lint */ |
12 | ||
966c6ec0 | 13 | #include <sys/types.h> |
bfe13c81 | 14 | #include <stdio.h> |
966c6ec0 | 15 | #include <less.h> |
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16 | |
17 | #define WHITESP(c) ((c)==' ' || (c)=='\t') | |
18 | ||
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19 | char *tagfile; |
20 | char *tagpattern; | |
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21 | |
22 | static char *tags = "tags"; | |
23 | ||
24 | extern int linenums; | |
25 | extern int sigs; | |
26 | extern char *line; | |
27 | ||
28 | /* | |
29 | * Find a tag in the "tags" file. | |
30 | * Sets "tagfile" to the name of the file containing the tag, | |
31 | * and "tagpattern" to the search pattern which should be used | |
32 | * to find the tag. | |
33 | */ | |
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34 | findtag(tag) |
35 | register char *tag; | |
36 | { | |
37 | register char *p; | |
38 | register FILE *f; | |
39 | register int taglen; | |
40 | int search_char; | |
41 | static char tline[200]; | |
42 | ||
43 | if ((f = fopen(tags, "r")) == NULL) | |
44 | { | |
45 | error("No tags file"); | |
46 | tagfile = NULL; | |
47 | return; | |
48 | } | |
49 | ||
50 | taglen = strlen(tag); | |
51 | ||
52 | /* | |
53 | * Search the tags file for the desired tag. | |
54 | */ | |
55 | while (fgets(tline, sizeof(tline), f) != NULL) | |
56 | { | |
57 | if (strncmp(tag, tline, taglen) != 0 || !WHITESP(tline[taglen])) | |
58 | continue; | |
59 | ||
60 | /* | |
61 | * Found it. | |
62 | * The line contains the tag, the filename and the | |
63 | * pattern, separated by white space. | |
64 | * The pattern is surrounded by a pair of identical | |
65 | * search characters. | |
66 | * Parse the line and extract these parts. | |
67 | */ | |
68 | tagfile = tagpattern = NULL; | |
69 | ||
70 | /* | |
71 | * Skip over the whitespace after the tag name. | |
72 | */ | |
73 | for (p = tline; !WHITESP(*p) && *p != '\0'; p++) | |
74 | continue; | |
75 | while (WHITESP(*p)) | |
76 | p++; | |
77 | if (*p == '\0') | |
78 | /* File name is missing! */ | |
79 | continue; | |
80 | ||
81 | /* | |
82 | * Save the file name. | |
83 | * Skip over the whitespace after the file name. | |
84 | */ | |
85 | tagfile = p; | |
86 | while (!WHITESP(*p) && *p != '\0') | |
87 | p++; | |
88 | *p++ = '\0'; | |
89 | while (WHITESP(*p)) | |
90 | p++; | |
91 | if (*p == '\0') | |
92 | /* Pattern is missing! */ | |
93 | continue; | |
94 | ||
95 | /* | |
96 | * Save the pattern. | |
97 | * Skip to the end of the pattern. | |
98 | * Delete the initial "^" and the final "$" from the pattern. | |
99 | */ | |
100 | search_char = *p++; | |
101 | if (*p == '^') | |
102 | p++; | |
103 | tagpattern = p; | |
104 | while (*p != search_char && *p != '\0') | |
105 | p++; | |
106 | if (p[-1] == '$') | |
107 | p--; | |
108 | *p = '\0'; | |
109 | ||
966c6ec0 | 110 | (void)fclose(f); |
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111 | return; |
112 | } | |
966c6ec0 | 113 | (void)fclose(f); |
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114 | error("No such tag in tags file"); |
115 | tagfile = NULL; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Search for a tag. | |
120 | * This is a stripped-down version of search(). | |
121 | * We don't use search() for several reasons: | |
122 | * - We don't want to blow away any search string we may have saved. | |
123 | * - The various regular-expression functions (from different systems: | |
124 | * regcmp vs. re_comp) behave differently in the presence of | |
125 | * parentheses (which are almost always found in a tag). | |
126 | */ | |
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127 | tagsearch() |
128 | { | |
966c6ec0 | 129 | off_t pos, linepos, forw_raw_line(); |
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130 | int linenum; |
131 | ||
966c6ec0 | 132 | pos = (off_t)0; |
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133 | linenum = find_linenum(pos); |
134 | ||
135 | for (;;) | |
136 | { | |
137 | /* | |
138 | * Get lines until we find a matching one or | |
139 | * until we hit end-of-file. | |
140 | */ | |
141 | if (sigs) | |
142 | return (1); | |
143 | ||
144 | /* | |
145 | * Read the next line, and save the | |
146 | * starting position of that line in linepos. | |
147 | */ | |
148 | linepos = pos; | |
149 | pos = forw_raw_line(pos); | |
150 | if (linenum != 0) | |
151 | linenum++; | |
152 | ||
153 | if (pos == NULL_POSITION) | |
154 | { | |
155 | /* | |
156 | * We hit EOF without a match. | |
157 | */ | |
158 | error("Tag not found"); | |
159 | return (1); | |
160 | } | |
161 | ||
162 | /* | |
163 | * If we're using line numbers, we might as well | |
164 | * remember the information we have now (the position | |
165 | * and line number of the current line). | |
166 | */ | |
167 | if (linenums) | |
168 | add_lnum(linenum, pos); | |
169 | ||
170 | /* | |
171 | * Test the line to see if we have a match. | |
172 | */ | |
173 | if (strcmp(tagpattern, line) == 0) | |
174 | break; | |
175 | } | |
176 | ||
177 | jump_loc(linepos); | |
178 | return (0); | |
179 | } |