Commit | Line | Data |
---|---|---|
4b9ccde7 | 1 | static char *sccsid = "@(#)expand.c 4.2 (Berkeley) 2/7/81"; |
fb2da2bb BJ |
2 | #include <stdio.h> |
3 | /* | |
4 | * expand - expand tabs to equivalent spaces | |
5 | */ | |
6 | char obuf[BUFSIZ]; | |
7 | int nstops; | |
8 | int tabstops[100]; | |
9 | ||
10 | main(argc, argv) | |
11 | int argc; | |
12 | char *argv[]; | |
13 | { | |
14 | register int c, column; | |
15 | register int n; | |
16 | ||
17 | setbuf(stdout, obuf); | |
18 | argc--, argv++; | |
19 | do { | |
20 | while (argc > 0 && argv[0][0] == '-') { | |
21 | getstops(argv[0]); | |
22 | argc--, argv++; | |
23 | } | |
24 | if (argc > 0) { | |
25 | if (freopen(argv[0], "r", stdin) == NULL) { | |
26 | perror(argv[0]); | |
27 | exit(1); | |
28 | } | |
29 | argc--, argv++; | |
30 | } | |
31 | column = 0; | |
32 | for (;;) { | |
33 | c = getc(stdin); | |
34 | if (c == -1) | |
35 | break; | |
36 | switch (c) { | |
37 | ||
38 | case '\t': | |
39 | if (nstops == 0) { | |
40 | do { | |
41 | putchar(' '); | |
42 | column++; | |
43 | } while (column & 07); | |
44 | continue; | |
45 | } | |
46 | if (nstops == 1) { | |
47 | do { | |
48 | putchar(' '); | |
49 | column++; | |
50 | } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); | |
51 | continue; | |
52 | } | |
53 | for (n = 0; n < nstops; n++) | |
54 | if (tabstops[n] > column) | |
55 | break; | |
56 | if (n == nstops) { | |
57 | putchar(' '); | |
58 | column++; | |
59 | continue; | |
60 | } | |
61 | while (column < tabstops[n]) { | |
62 | putchar(' '); | |
63 | column++; | |
64 | } | |
65 | continue; | |
66 | ||
67 | case '\b': | |
68 | if (column) | |
69 | column--; | |
70 | putchar('\b'); | |
71 | continue; | |
72 | ||
73 | default: | |
74 | putchar(c); | |
75 | column++; | |
76 | continue; | |
77 | ||
78 | case '\n': | |
79 | putchar(c); | |
80 | column = 0; | |
81 | continue; | |
82 | } | |
83 | } | |
84 | } while (argc > 0); | |
85 | exit(0); | |
86 | } | |
87 | ||
88 | getstops(cp) | |
89 | register char *cp; | |
90 | { | |
91 | register int i; | |
92 | ||
93 | nstops = 0; | |
94 | cp++; | |
95 | for (;;) { | |
96 | i = 0; | |
97 | while (*cp >= '0' && *cp <= '9') | |
98 | i = i * 10 + *cp++ - '0'; | |
99 | if (i <= 0 || i > 256) { | |
100 | bad: | |
101 | fprintf(stderr, "Bad tab stop spec\n"); | |
102 | exit(1); | |
103 | } | |
73c2cdfe | 104 | if (nstops > 0 && i <= tabstops[nstops-1]) |
fb2da2bb BJ |
105 | goto bad; |
106 | tabstops[nstops++] = i; | |
107 | if (*cp == 0) | |
108 | break; | |
109 | if (*cp++ != ',') | |
110 | goto bad; | |
111 | } | |
112 | } |