Commit | Line | Data |
---|---|---|
21ff1e3c | 1 | static char *sccsid = "@(#)look.c 4.2 (Berkeley) %G%"; |
027304e0 BJ |
2 | #include <stdio.h> |
3 | #include <ctype.h> | |
4 | ||
5 | FILE *dfile; | |
6 | char *filenam = "/usr/dict/words"; | |
7 | ||
8 | int fold; | |
9 | int dict; | |
10 | int tab; | |
11 | char entry[250]; | |
12 | char word[250]; | |
13 | char key[50]; | |
14 | ||
15 | main(argc,argv) | |
16 | char **argv; | |
17 | { | |
18 | register c; | |
19 | long top,bot,mid; | |
20 | while(argc>=2 && *argv[1]=='-') { | |
21 | for(;;) { | |
22 | switch(*++argv[1]) { | |
23 | case 'd': | |
24 | dict++; | |
25 | continue; | |
26 | case 'f': | |
27 | fold++; | |
28 | continue; | |
29 | case 't': | |
30 | tab = argv[1][1]; | |
31 | if(tab) | |
32 | ++argv[1]; | |
33 | continue; | |
34 | case 0: | |
35 | break; | |
36 | default: | |
37 | continue; | |
38 | } | |
39 | break; | |
40 | } | |
41 | argc --; | |
42 | argv++; | |
43 | } | |
44 | if(argc<=1) | |
45 | return; | |
46 | if(argc==2) { | |
47 | fold++; | |
48 | dict++; | |
49 | } else | |
50 | filenam = argv[2]; | |
51 | dfile = fopen(filenam,"r"); | |
52 | if(dfile==NULL) { | |
53 | fprintf(stderr,"look: can't open %s\n",filenam); | |
54 | exit(2); | |
55 | } | |
56 | canon(argv[1],key); | |
57 | bot = 0; | |
58 | fseek(dfile,0L,2); | |
59 | top = ftell(dfile); | |
60 | for(;;) { | |
61 | mid = (top+bot)/2; | |
62 | fseek(dfile,mid,0); | |
63 | do { | |
64 | c = getc(dfile); | |
65 | mid++; | |
66 | } while(c!=EOF && c!='\n'); | |
67 | if(!getword(entry)) | |
68 | break; | |
69 | canon(entry,word); | |
70 | switch(compare(key,word)) { | |
71 | case -2: | |
72 | case -1: | |
73 | case 0: | |
74 | if(top<=mid) | |
75 | break; | |
76 | top = mid; | |
77 | continue; | |
78 | case 1: | |
79 | case 2: | |
80 | bot = mid; | |
81 | continue; | |
82 | } | |
83 | break; | |
84 | } | |
85 | fseek(dfile,bot,0); | |
86 | while(ftell(dfile)<top) { | |
87 | if(!getword(entry)) | |
88 | return; | |
89 | canon(entry,word); | |
90 | switch(compare(key,word)) { | |
91 | case -2: | |
92 | return; | |
93 | case -1: | |
94 | case 0: | |
95 | puts(entry,stdout); | |
96 | break; | |
97 | case 1: | |
98 | case 2: | |
99 | continue; | |
100 | } | |
101 | break; | |
102 | } | |
103 | while(getword(entry)) { | |
104 | canon(entry,word); | |
105 | switch(compare(key,word)) { | |
106 | case -1: | |
107 | case 0: | |
108 | puts(entry,stdout); | |
109 | continue; | |
110 | } | |
111 | break; | |
112 | } | |
21ff1e3c | 113 | exit(0); |
027304e0 BJ |
114 | } |
115 | ||
116 | compare(s,t) | |
117 | register char *s,*t; | |
118 | { | |
119 | for(;*s==*t;s++,t++) | |
120 | if(*s==0) | |
121 | return(0); | |
122 | return(*s==0? -1: | |
123 | *t==0? 1: | |
124 | *s<*t? -2: | |
125 | 2); | |
126 | } | |
127 | ||
128 | getword(w) | |
129 | char *w; | |
130 | { | |
131 | register c; | |
132 | for(;;) { | |
133 | c = getc(dfile); | |
134 | if(c==EOF) | |
135 | return(0); | |
136 | if(c=='\n') | |
137 | break; | |
138 | *w++ = c; | |
139 | } | |
140 | *w = 0; | |
141 | return(1); | |
142 | } | |
143 | ||
144 | canon(old,new) | |
145 | char *old,*new; | |
146 | { | |
147 | register c; | |
148 | for(;;) { | |
149 | *new = c = *old++; | |
150 | if(c==0||c==tab) { | |
151 | *new = 0; | |
152 | break; | |
153 | } | |
154 | if(dict) { | |
155 | if(!isalnum(c)) | |
156 | continue; | |
157 | } | |
158 | if(fold) { | |
159 | if(isupper(c)) | |
160 | *new += 'a' - 'A'; | |
161 | } | |
162 | new++; | |
163 | } | |
164 | } |