projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 14db73f8 BJ |
1 | static char *sccsid = "@(#)tr.c 4.1 (Berkeley) %G%"; |
| 2 | #include <stdio.h> | |
| 3 | ||
| 4 | /* tr - transliterate data stream */ | |
| 5 | int dflag = 0; | |
| 6 | int sflag = 0; | |
| 7 | int cflag = 0; | |
| 8 | int save = 0; | |
| 9 | char code[256]; | |
| 10 | char squeez[256]; | |
| 11 | char vect[256]; | |
| 12 | struct string { int last, max; char *p; } string1, string2; | |
| 13 | ||
| 14 | main(argc,argv) | |
| 15 | char **argv; | |
| 16 | { | |
| 17 | register i; | |
| 18 | int j; | |
| 19 | register c, d; | |
| 20 | char *compl; | |
| 21 | int lastd; | |
| 22 | ||
| 23 | string1.last = string2.last = 0; | |
| 24 | string1.max = string2.max = 0; | |
| 25 | string1.p = string2.p = ""; | |
| 26 | ||
| 27 | if(--argc>0) { | |
| 28 | argv++; | |
| 29 | if(*argv[0]=='-'&&argv[0][1]!=0) { | |
| 30 | while(*++argv[0]) | |
| 31 | switch(*argv[0]) { | |
| 32 | case 'c': | |
| 33 | cflag++; | |
| 34 | continue; | |
| 35 | case 'd': | |
| 36 | dflag++; | |
| 37 | continue; | |
| 38 | case 's': | |
| 39 | sflag++; | |
| 40 | continue; | |
| 41 | } | |
| 42 | argc--; | |
| 43 | argv++; | |
| 44 | } | |
| 45 | } | |
| 46 | if(argc>0) string1.p = argv[0]; | |
| 47 | if(argc>1) string2.p = argv[1]; | |
| 48 | for(i=0; i<256; i++) | |
| 49 | code[i] = vect[i] = 0; | |
| 50 | if(cflag) { | |
| 51 | while(c = next(&string1)) | |
| 52 | vect[c&0377] = 1; | |
| 53 | j = 0; | |
| 54 | for(i=1; i<256; i++) | |
| 55 | if(vect[i]==0) vect[j++] = i; | |
| 56 | vect[j] = 0; | |
| 57 | compl = vect; | |
| 58 | } | |
| 59 | for(i=0; i<256; i++) | |
| 60 | squeez[i] = 0; | |
| 61 | lastd = 0; | |
| 62 | for(;;){ | |
| 63 | if(cflag) c = *compl++; | |
| 64 | else c = next(&string1); | |
| 65 | if(c==0) break; | |
| 66 | d = next(&string2); | |
| 67 | if(d==0) d = lastd; | |
| 68 | else lastd = d; | |
| 69 | squeez[d&0377] = 1; | |
| 70 | code[c&0377] = dflag?1:d; | |
| 71 | } | |
| 72 | while(d = next(&string2)) | |
| 73 | squeez[d&0377] = 1; | |
| 74 | squeez[0] = 1; | |
| 75 | for(i=0;i<256;i++) { | |
| 76 | if(code[i]==0) code[i] = i; | |
| 77 | else if(dflag) code[i] = 0; | |
| 78 | } | |
| 79 | ||
| 80 | while((c=getc(stdin)) != EOF ) { | |
| 81 | if(c == 0) continue; | |
| 82 | if(c = code[c&0377]&0377) | |
| 83 | if(!sflag || c!=save || !squeez[c&0377]) | |
| 84 | putchar(save = c); | |
| 85 | } | |
| 86 | exit(0); | |
| 87 | } | |
| 88 | ||
| 89 | next(s) | |
| 90 | struct string *s; | |
| 91 | { | |
| 92 | ||
| 93 | again: | |
| 94 | if(s->max) { | |
| 95 | if(s->last++ < s->max) | |
| 96 | return(s->last); | |
| 97 | s->max = s->last = 0; | |
| 98 | } | |
| 99 | if(s->last && *s->p=='-') { | |
| 100 | nextc(s); | |
| 101 | s->max = nextc(s); | |
| 102 | if(s->max==0) { | |
| 103 | s->p--; | |
| 104 | return('-'); | |
| 105 | } | |
| 106 | if(s->max < s->last) { | |
| 107 | s->last = s->max-1; | |
| 108 | return('-'); | |
| 109 | } | |
| 110 | goto again; | |
| 111 | } | |
| 112 | return(s->last = nextc(s)); | |
| 113 | } | |
| 114 | ||
| 115 | nextc(s) | |
| 116 | struct string *s; | |
| 117 | { | |
| 118 | register c, i, n; | |
| 119 | ||
| 120 | c = *s->p++; | |
| 121 | if(c=='\\') { | |
| 122 | i = n = 0; | |
| 123 | while(i<3 && (c = *s->p)>='0' && c<='7') { | |
| 124 | n = n*8 + c - '0'; | |
| 125 | i++; | |
| 126 | s->p++; | |
| 127 | } | |
| 128 | if(i>0) c = n; | |
| 129 | else c = *s->p++; | |
| 130 | } | |
| 131 | if(c==0) *--s->p = 0; | |
| 132 | return(c&0377); | |
| 133 | } |