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1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
13 | #ifndef lint | |
14 | static char sccsid[] = "@(#)apropos.c 5.1 (Berkeley) %G%"; | |
15 | #endif not lint | |
16 | ||
17 | #include <sys/param.h> | |
18 | #include <stdio.h> | |
19 | #include <ctype.h> | |
20 | ||
21 | #define DEF_PATH "/usr/man" /* default man path */ | |
22 | #define MAXLINELEN 500 /* max line handled */ | |
23 | #define NO 0 /* no/false */ | |
24 | #define WHATIS "whatis" /* database name */ | |
25 | #define YES 1 /* yes/true */ | |
26 | ||
27 | static char *myname; | |
28 | ||
29 | main(argc, argv) | |
30 | int argc; | |
31 | char **argv; | |
32 | { | |
33 | extern char *optarg; | |
34 | extern int optind; | |
35 | register char *beg, *end, **C; | |
36 | int ch, foundman = NO, *found, isapropos, | |
37 | a_match(), w_match(), (*match)(); | |
38 | char *manpath = NULL, | |
39 | buf[MAXLINELEN + 1], fname[MAXPATHLEN + 1], | |
40 | wbuf[MAXLINELEN + 1], | |
41 | *getenv(), *index(), *malloc(), *rindex(); | |
42 | ||
43 | myname = (beg = rindex(*argv, '/')) ? beg + 1 : *argv; | |
44 | if (!strcmp(myname, "apropos")) { | |
45 | isapropos = YES; | |
46 | match = a_match; | |
47 | } | |
48 | else { | |
49 | isapropos = NO; | |
50 | match = w_match; | |
51 | } | |
52 | while ((ch = getopt(argc, argv, "M:P:")) != EOF) | |
53 | switch((char)ch) { | |
54 | case 'M': | |
55 | case 'P': /* backward contemptible */ | |
56 | manpath = optarg; | |
57 | break; | |
58 | case '?': | |
59 | default: | |
60 | usage(); | |
61 | } | |
62 | argv += optind; | |
63 | argc -= optind; | |
64 | if (argc < 1) | |
65 | usage(); | |
66 | ||
67 | if (!(manpath = getenv("MANPATH"))) | |
68 | manpath = DEF_PATH; | |
69 | ||
70 | /*NOSTRICT*/ | |
71 | if (!(found = (int *)malloc((u_int)argc))) { | |
72 | fprintf(stderr, "%s: out of space.\n", myname); | |
73 | exit(1); | |
74 | } | |
75 | bzero(found, argc * sizeof(int)); /* calloc is silly */ | |
76 | ||
77 | if (!isapropos) | |
78 | for (C = argv; *C; ++C) { /* trim full paths */ | |
79 | if (beg = rindex(*C, '/')) | |
80 | *C = beg + 1; | |
81 | } | |
82 | for (C = argv; *C; ++C) /* convert to lower-case */ | |
83 | lowstr(*C, *C); | |
84 | ||
85 | for (beg = manpath; beg; beg = end) { /* through path list */ | |
86 | end = index(beg, ':'); | |
87 | if (!end) | |
88 | (void)sprintf(fname, "%s/%s", beg, WHATIS); | |
89 | else { | |
90 | (void)sprintf(fname, "%.*s/%s", end - beg, beg, WHATIS); | |
91 | ++end; | |
92 | } | |
93 | /* for each file found */ | |
94 | if (freopen(fname, "r", stdin)) { | |
95 | foundman = YES; | |
96 | while (gets(buf)) { /* read & convert to lcase */ | |
97 | lowstr(buf, wbuf); | |
98 | for (C = argv; *C; ++C) | |
99 | if ((*match)(wbuf, *C)) { | |
100 | puts(buf); | |
101 | found[C - argv] = YES; | |
102 | ||
103 | /* only print line once */ | |
104 | while (*++C) | |
105 | if ((*match)(wbuf, *C)) | |
106 | found[C - argv] = YES; | |
107 | break; | |
108 | } | |
109 | } | |
110 | } | |
111 | } | |
112 | if (!foundman) { | |
113 | fprintf(stderr, "%s: no %s file found in %s.\n", myname, WHATIS, manpath); | |
114 | exit(1); | |
115 | } | |
116 | for (C = argv; *C; C++) | |
117 | if (!found[C - argv]) | |
118 | printf("%s: %s\n", *C, isapropos ? "nothing appropriate" : "not found"); | |
119 | } | |
120 | ||
121 | static | |
122 | a_match(bp, str) | |
123 | register char *bp, *str; | |
124 | { | |
125 | register char test, *Cs, *Cb; | |
126 | ||
127 | if (!*bp) | |
128 | return(NO); | |
129 | /* backward contemptible: everything matches empty string */ | |
130 | if (!*str) | |
131 | return(YES); | |
132 | for (test = *str++; *bp;) | |
133 | if (test == *bp++) { | |
134 | Cs = str; | |
135 | Cb = bp; | |
136 | do { | |
137 | if (!*Cs) | |
138 | return(YES); | |
139 | } while (*Cb++ == *Cs++); | |
140 | } | |
141 | return(NO); | |
142 | } | |
143 | ||
144 | static | |
145 | w_match(bp, str) | |
146 | register char *bp, *str; | |
147 | { | |
148 | register char test, *Cs, *Cb; | |
149 | ||
150 | if (!*str || !*bp) | |
151 | return(NO); | |
152 | for (test = *str++; *bp;) | |
153 | if (test == *bp++) { | |
154 | for (Cs = str, Cb = bp; *Cs == *Cb; ++Cs, ++Cb); | |
155 | if (!*Cs && (isspace(*Cb) || *Cb == '(' || *Cb == ',')) | |
156 | return(YES); | |
157 | } | |
158 | return(NO); | |
159 | } | |
160 | ||
161 | static | |
162 | lowstr(from, to) | |
163 | register char *from, *to; | |
164 | { | |
165 | for (; *from; ++from, ++to) | |
166 | *to = isupper(*from) ? tolower(*from) : *from; | |
167 | *to = '\0'; | |
168 | } | |
169 | ||
170 | static | |
171 | usage() | |
172 | { | |
173 | fprintf(stderr, "usage: %s [-M path] string ...\n", myname); | |
174 | exit(1); | |
175 | } | |
176 |