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1 | /* |
2 | * Copyright (c) 1988 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | */ | |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
20 | "@(#) Copyright (c) 1988 The Regents of the University of California.\n\ | |
21 | All rights reserved.\n"; | |
22 | #endif /* not lint */ | |
23 | ||
24 | #ifndef lint | |
44ec1783 | 25 | static char sccsid[] = "@(#)tr.c 4.4 (Berkeley) %G%"; |
5ad3291e KB |
26 | #endif /* not lint */ |
27 | ||
28 | #include <sys/types.h> | |
14db73f8 | 29 | #include <stdio.h> |
5ad3291e | 30 | #include <ctype.h> |
14db73f8 | 31 | |
5ad3291e KB |
32 | #define NCHARS 256 /* size of u_char */ |
33 | #define OOBCH 257 /* out of band value */ | |
14db73f8 | 34 | |
5ad3291e KB |
35 | typedef struct { |
36 | char *str; | |
37 | int lastch, endrange; | |
38 | enum { NORM, INRANGE, EOS } state; | |
39 | } STR; | |
14db73f8 | 40 | |
5ad3291e KB |
41 | main(argc, argv) |
42 | int argc; | |
43 | char **argv; | |
44 | { | |
45 | extern int optind; | |
46 | STR s1, s2; | |
47 | register int ch, indx, lastch; | |
48 | int cflag, dflag, sflag; | |
49 | u_char *tp, tab[NCHARS], squeeze[NCHARS]; | |
14db73f8 | 50 | |
5ad3291e KB |
51 | cflag = dflag = sflag = 0; |
52 | while ((ch = getopt(argc, argv, "cds")) != EOF) | |
53 | switch((char)ch) { | |
54 | case 'c': | |
55 | cflag = 1; | |
56 | break; | |
57 | case 'd': | |
58 | dflag = 1; | |
59 | break; | |
60 | case 's': | |
61 | sflag = 1; | |
62 | break; | |
63 | case '?': | |
64 | default: | |
65 | fprintf(stderr, | |
66 | "usage: tr [-cds] [string1 [string2]]\n"); | |
67 | exit(1); | |
14db73f8 | 68 | } |
5ad3291e KB |
69 | argc -= optind; |
70 | argv += optind; | |
71 | ||
72 | /* | |
73 | * the original tr was amazingly tolerant of the command line. | |
74 | * Neither -c or -s have any effect unless there are two strings. | |
75 | * Extra arguments are silently ignored. Bag this noise, they | |
76 | * should all be errors. | |
77 | */ | |
78 | if (argc < 2 && !dflag) { | |
79 | while ((ch = getchar()) != EOF) | |
80 | putchar(ch); | |
81 | exit(0); | |
14db73f8 BJ |
82 | } |
83 | ||
5ad3291e KB |
84 | bzero(tab, NCHARS); |
85 | if (sflag) { | |
86 | s1.str = argv[1]; | |
87 | s1.state = NORM; | |
88 | s1.lastch = OOBCH; | |
89 | while (next(&s1)) | |
90 | squeeze[s1.lastch] = 1; | |
91 | } | |
92 | if (dflag) { | |
93 | s1.str = argv[0]; | |
94 | s1.state = NORM; | |
95 | s1.lastch = OOBCH; | |
96 | while (next(&s1)) | |
97 | tab[s1.lastch] = 1; | |
98 | if (cflag) | |
99 | for (tp = tab, indx = 0; indx < NCHARS; ++tp, ++indx) | |
100 | *tp = !*tp; | |
101 | if (sflag) | |
102 | for (lastch = OOBCH; (ch = getchar()) != EOF;) { | |
103 | if (tab[ch] || (squeeze[ch] && lastch == ch)) | |
104 | continue; | |
105 | lastch = ch; | |
106 | putchar(ch); | |
107 | } | |
108 | else | |
109 | while ((ch = getchar()) != EOF) | |
110 | if (!tab[ch]) | |
111 | putchar(ch); | |
112 | } else { | |
113 | s1.str = argv[0]; | |
114 | s2.str = argv[1]; | |
115 | s1.state = s2.state = NORM; | |
116 | s1.lastch = s2.lastch = OOBCH; | |
117 | if (cflag) { | |
118 | /* | |
119 | * if cflag is set, tr just pretends it only got one | |
120 | * character in string2. As reasonable as anything | |
121 | * else. Should really be an error. | |
122 | */ | |
123 | while (next(&s2)); | |
124 | lastch = s2.lastch; | |
125 | for (tp = tab, indx = 0; indx < NCHARS; ++tp, ++indx) | |
126 | *tp = lastch; | |
127 | while (next(&s1)) | |
128 | tab[s1.lastch] = s1.lastch; | |
129 | } else { | |
130 | for (tp = tab, indx = 0; indx < NCHARS; ++tp, ++indx) | |
131 | *tp = indx; | |
132 | while (next(&s1)) { | |
133 | (void)next(&s2); | |
134 | tab[s1.lastch] = s2.lastch; | |
135 | } | |
136 | } | |
137 | if (sflag) | |
138 | for (lastch = OOBCH; (ch = getchar()) != EOF;) { | |
139 | ch = tab[ch]; | |
140 | if (squeeze[ch] && lastch == ch) | |
141 | continue; | |
142 | lastch = ch; | |
143 | putchar(ch); | |
bbcc5e9f | 144 | } |
5ad3291e KB |
145 | else |
146 | while ((ch = getchar()) != EOF) | |
147 | putchar((int)tab[ch]); | |
14db73f8 BJ |
148 | } |
149 | exit(0); | |
150 | } | |
151 | ||
152 | next(s) | |
5ad3291e | 153 | STR *s; |
14db73f8 | 154 | { |
5ad3291e | 155 | register int ch; |
14db73f8 | 156 | |
5ad3291e KB |
157 | if (s->state == EOS) |
158 | return(0); | |
159 | if (s->state == INRANGE) { | |
160 | if (++s->lastch == s->endrange) | |
161 | s->state = NORM; | |
162 | return(1); | |
163 | } | |
164 | if (!(ch = *s->str++)) { | |
165 | s->state = EOS; | |
166 | return(0); | |
14db73f8 | 167 | } |
44ec1783 KB |
168 | if (ch == '\\') { /* \### */ |
169 | s->lastch = tran(s); | |
5ad3291e KB |
170 | return(1); |
171 | } | |
172 | if (ch == '-') { /* ranges */ | |
44ec1783 KB |
173 | if (s->lastch == OOBCH) /* "-a" */ |
174 | goto fail2; | |
175 | if (!(ch = *s->str++)) /* "a-" */ | |
176 | goto fail1; | |
177 | if (ch == '\\') /* \### */ | |
178 | ch = tran(s); | |
5ad3291e | 179 | if (s->lastch > ch) { /* "z-a" */ |
44ec1783 KB |
180 | fail1: --s->str; |
181 | fail2: s->lastch = '-'; | |
5ad3291e | 182 | return(1); |
14db73f8 | 183 | } |
5ad3291e KB |
184 | if (s->lastch == ch) /* "a-a" */ |
185 | return(next(s)); | |
186 | s->state = INRANGE; /* "a-z" */ | |
44ec1783 | 187 | s->endrange = ch; |
5ad3291e | 188 | return(1); |
14db73f8 | 189 | } |
5ad3291e KB |
190 | s->lastch = ch; |
191 | return(1); | |
14db73f8 | 192 | } |
44ec1783 KB |
193 | |
194 | tran(s) | |
195 | register STR *s; | |
196 | { | |
197 | register int ch, cnt, val; | |
198 | ||
199 | for (val = cnt = 0; isascii(ch = *s->str) && isdigit(ch) | |
200 | && cnt++ < 3; ++s->str) | |
201 | val = val * 8 + ch - '0'; | |
202 | return(cnt ? val : ch); | |
203 | } |