Commit | Line | Data |
---|---|---|
32a94702 | 1 | static char *sccsid = "@(#)expand.c 4.3 (Berkeley) %G%"; |
fb2da2bb BJ |
2 | #include <stdio.h> |
3 | /* | |
4 | * expand - expand tabs to equivalent spaces | |
5 | */ | |
fb2da2bb BJ |
6 | int nstops; |
7 | int tabstops[100]; | |
8 | ||
9 | main(argc, argv) | |
10 | int argc; | |
11 | char *argv[]; | |
12 | { | |
13 | register int c, column; | |
14 | register int n; | |
15 | ||
fb2da2bb BJ |
16 | argc--, argv++; |
17 | do { | |
18 | while (argc > 0 && argv[0][0] == '-') { | |
19 | getstops(argv[0]); | |
20 | argc--, argv++; | |
21 | } | |
22 | if (argc > 0) { | |
23 | if (freopen(argv[0], "r", stdin) == NULL) { | |
24 | perror(argv[0]); | |
25 | exit(1); | |
26 | } | |
27 | argc--, argv++; | |
28 | } | |
29 | column = 0; | |
30 | for (;;) { | |
31 | c = getc(stdin); | |
32 | if (c == -1) | |
33 | break; | |
34 | switch (c) { | |
35 | ||
36 | case '\t': | |
37 | if (nstops == 0) { | |
38 | do { | |
39 | putchar(' '); | |
40 | column++; | |
41 | } while (column & 07); | |
42 | continue; | |
43 | } | |
44 | if (nstops == 1) { | |
45 | do { | |
46 | putchar(' '); | |
47 | column++; | |
48 | } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); | |
49 | continue; | |
50 | } | |
51 | for (n = 0; n < nstops; n++) | |
52 | if (tabstops[n] > column) | |
53 | break; | |
54 | if (n == nstops) { | |
55 | putchar(' '); | |
56 | column++; | |
57 | continue; | |
58 | } | |
59 | while (column < tabstops[n]) { | |
60 | putchar(' '); | |
61 | column++; | |
62 | } | |
63 | continue; | |
64 | ||
65 | case '\b': | |
66 | if (column) | |
67 | column--; | |
68 | putchar('\b'); | |
69 | continue; | |
70 | ||
71 | default: | |
72 | putchar(c); | |
73 | column++; | |
74 | continue; | |
75 | ||
76 | case '\n': | |
77 | putchar(c); | |
78 | column = 0; | |
79 | continue; | |
80 | } | |
81 | } | |
82 | } while (argc > 0); | |
83 | exit(0); | |
84 | } | |
85 | ||
86 | getstops(cp) | |
87 | register char *cp; | |
88 | { | |
89 | register int i; | |
90 | ||
91 | nstops = 0; | |
92 | cp++; | |
93 | for (;;) { | |
94 | i = 0; | |
95 | while (*cp >= '0' && *cp <= '9') | |
96 | i = i * 10 + *cp++ - '0'; | |
97 | if (i <= 0 || i > 256) { | |
98 | bad: | |
99 | fprintf(stderr, "Bad tab stop spec\n"); | |
100 | exit(1); | |
101 | } | |
73c2cdfe | 102 | if (nstops > 0 && i <= tabstops[nstops-1]) |
fb2da2bb BJ |
103 | goto bad; |
104 | tabstops[nstops++] = i; | |
105 | if (*cp == 0) | |
106 | break; | |
107 | if (*cp++ != ',') | |
108 | goto bad; | |
109 | } | |
110 | } |