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 5.3 (Berkeley) 07/30/87"; 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:/usr/new/man:/usr/local/man" 22 #define MAXLINELEN 1000 /* 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((char *)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