| 1 | #include <stdio.h> |
| 2 | #include <ctype.h> |
| 3 | |
| 4 | FILE *dfile; |
| 5 | char *filenam = "/usr/dict/words"; |
| 6 | |
| 7 | int fold; |
| 8 | int dict; |
| 9 | int tab; |
| 10 | char entry[250]; |
| 11 | char word[250]; |
| 12 | char key[50]; |
| 13 | |
| 14 | main(argc,argv) |
| 15 | char **argv; |
| 16 | { |
| 17 | register c; |
| 18 | long top,bot,mid; |
| 19 | while(argc>=2 && *argv[1]=='-') { |
| 20 | for(;;) { |
| 21 | switch(*++argv[1]) { |
| 22 | case 'd': |
| 23 | dict++; |
| 24 | continue; |
| 25 | case 'f': |
| 26 | fold++; |
| 27 | continue; |
| 28 | case 't': |
| 29 | tab = argv[1][1]; |
| 30 | if(tab) |
| 31 | ++argv[1]; |
| 32 | continue; |
| 33 | case 0: |
| 34 | break; |
| 35 | default: |
| 36 | continue; |
| 37 | } |
| 38 | break; |
| 39 | } |
| 40 | argc --; |
| 41 | argv++; |
| 42 | } |
| 43 | if(argc<=1) |
| 44 | return; |
| 45 | if(argc==2) { |
| 46 | fold++; |
| 47 | dict++; |
| 48 | } else |
| 49 | filenam = argv[2]; |
| 50 | dfile = fopen(filenam,"r"); |
| 51 | if(dfile==NULL) { |
| 52 | fprintf(stderr,"look: can't open %s\n",filenam); |
| 53 | exit(2); |
| 54 | } |
| 55 | canon(argv[1],key); |
| 56 | bot = 0; |
| 57 | fseek(dfile,0L,2); |
| 58 | top = ftell(dfile); |
| 59 | for(;;) { |
| 60 | mid = (top+bot)/2; |
| 61 | fseek(dfile,mid,0); |
| 62 | do { |
| 63 | c = getc(dfile); |
| 64 | mid++; |
| 65 | } while(c!=EOF && c!='\n'); |
| 66 | if(!getword(entry)) |
| 67 | break; |
| 68 | canon(entry,word); |
| 69 | switch(compare(key,word)) { |
| 70 | case -2: |
| 71 | case -1: |
| 72 | case 0: |
| 73 | if(top<=mid) |
| 74 | break; |
| 75 | top = mid; |
| 76 | continue; |
| 77 | case 1: |
| 78 | case 2: |
| 79 | bot = mid; |
| 80 | continue; |
| 81 | } |
| 82 | break; |
| 83 | } |
| 84 | fseek(dfile,bot,0); |
| 85 | while(ftell(dfile)<top) { |
| 86 | if(!getword(entry)) |
| 87 | return; |
| 88 | canon(entry,word); |
| 89 | switch(compare(key,word)) { |
| 90 | case -2: |
| 91 | return; |
| 92 | case -1: |
| 93 | case 0: |
| 94 | puts(entry,stdout); |
| 95 | break; |
| 96 | case 1: |
| 97 | case 2: |
| 98 | continue; |
| 99 | } |
| 100 | break; |
| 101 | } |
| 102 | while(getword(entry)) { |
| 103 | canon(entry,word); |
| 104 | switch(compare(key,word)) { |
| 105 | case -1: |
| 106 | case 0: |
| 107 | puts(entry,stdout); |
| 108 | continue; |
| 109 | } |
| 110 | break; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | compare(s,t) |
| 115 | register char *s,*t; |
| 116 | { |
| 117 | for(;*s==*t;s++,t++) |
| 118 | if(*s==0) |
| 119 | return(0); |
| 120 | return(*s==0? -1: |
| 121 | *t==0? 1: |
| 122 | *s<*t? -2: |
| 123 | 2); |
| 124 | } |
| 125 | |
| 126 | getword(w) |
| 127 | char *w; |
| 128 | { |
| 129 | register c; |
| 130 | for(;;) { |
| 131 | c = getc(dfile); |
| 132 | if(c==EOF) |
| 133 | return(0); |
| 134 | if(c=='\n') |
| 135 | break; |
| 136 | *w++ = c; |
| 137 | } |
| 138 | *w = 0; |
| 139 | return(1); |
| 140 | } |
| 141 | |
| 142 | canon(old,new) |
| 143 | char *old,*new; |
| 144 | { |
| 145 | register c; |
| 146 | for(;;) { |
| 147 | *new = c = *old++; |
| 148 | if(c==0||c==tab) { |
| 149 | *new = 0; |
| 150 | break; |
| 151 | } |
| 152 | if(dict) { |
| 153 | if(!isalnum(c)) |
| 154 | continue; |
| 155 | } |
| 156 | if(fold) { |
| 157 | if(isupper(c)) |
| 158 | *new += 'a' - 'A'; |
| 159 | } |
| 160 | new++; |
| 161 | } |
| 162 | } |