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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1980 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1980 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)expand.c 5.3 (Berkeley) 6/1/90"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <stdio.h> | |
45 | /* | |
46 | * expand - expand tabs to equivalent spaces | |
47 | */ | |
48 | int nstops; | |
49 | int tabstops[100]; | |
50 | ||
51 | main(argc, argv) | |
52 | int argc; | |
53 | char *argv[]; | |
54 | { | |
55 | register int c, column; | |
56 | register int n; | |
57 | ||
58 | argc--, argv++; | |
59 | do { | |
60 | while (argc > 0 && argv[0][0] == '-') { | |
61 | getstops(argv[0]); | |
62 | argc--, argv++; | |
63 | } | |
64 | if (argc > 0) { | |
65 | if (freopen(argv[0], "r", stdin) == NULL) { | |
66 | perror(argv[0]); | |
67 | exit(1); | |
68 | } | |
69 | argc--, argv++; | |
70 | } | |
71 | column = 0; | |
72 | for (;;) { | |
73 | c = getc(stdin); | |
74 | if (c == -1) | |
75 | break; | |
76 | switch (c) { | |
77 | ||
78 | case '\t': | |
79 | if (nstops == 0) { | |
80 | do { | |
81 | putchar(' '); | |
82 | column++; | |
83 | } while (column & 07); | |
84 | continue; | |
85 | } | |
86 | if (nstops == 1) { | |
87 | do { | |
88 | putchar(' '); | |
89 | column++; | |
90 | } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); | |
91 | continue; | |
92 | } | |
93 | for (n = 0; n < nstops; n++) | |
94 | if (tabstops[n] > column) | |
95 | break; | |
96 | if (n == nstops) { | |
97 | putchar(' '); | |
98 | column++; | |
99 | continue; | |
100 | } | |
101 | while (column < tabstops[n]) { | |
102 | putchar(' '); | |
103 | column++; | |
104 | } | |
105 | continue; | |
106 | ||
107 | case '\b': | |
108 | if (column) | |
109 | column--; | |
110 | putchar('\b'); | |
111 | continue; | |
112 | ||
113 | default: | |
114 | putchar(c); | |
115 | column++; | |
116 | continue; | |
117 | ||
118 | case '\n': | |
119 | putchar(c); | |
120 | column = 0; | |
121 | continue; | |
122 | } | |
123 | } | |
124 | } while (argc > 0); | |
125 | exit(0); | |
126 | } | |
127 | ||
128 | getstops(cp) | |
129 | register char *cp; | |
130 | { | |
131 | register int i; | |
132 | ||
133 | nstops = 0; | |
134 | cp++; | |
135 | for (;;) { | |
136 | i = 0; | |
137 | while (*cp >= '0' && *cp <= '9') | |
138 | i = i * 10 + *cp++ - '0'; | |
139 | if (i <= 0 || i > 256) { | |
140 | bad: | |
141 | fprintf(stderr, "Bad tab stop spec\n"); | |
142 | exit(1); | |
143 | } | |
144 | if (nstops > 0 && i <= tabstops[nstops-1]) | |
145 | goto bad; | |
146 | tabstops[nstops++] = i; | |
147 | if (*cp == 0) | |
148 | break; | |
149 | if (*cp++ != ',') | |
150 | goto bad; | |
151 | } | |
152 | } |