Commit | Line | Data |
---|---|---|
45964d3d BJ |
1 | #include <stdio.h> |
2 | /* | |
3 | * expand - expand tabs to equivalent spaces | |
4 | */ | |
5 | char obuf[BUFSIZ]; | |
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 | ||
16 | setbuf(stdout, obuf); | |
17 | argc--, argv++; | |
18 | do { | |
19 | while (argc > 0 && argv[0][0] == '-') { | |
20 | getstops(argv[0]); | |
21 | argc--, argv++; | |
22 | } | |
23 | if (argc > 0) { | |
24 | if (freopen(argv[0], "r", stdin) == NULL) { | |
25 | perror(argv[0]); | |
26 | exit(1); | |
27 | } | |
28 | argc--, argv++; | |
29 | } | |
30 | column = 0; | |
31 | for (;;) { | |
32 | c = getc(stdin); | |
33 | if (c == -1) | |
34 | break; | |
35 | switch (c) { | |
36 | ||
37 | case '\t': | |
38 | if (nstops == 0) { | |
39 | do { | |
40 | putchar(' '); | |
41 | column++; | |
42 | } while (column & 07); | |
43 | continue; | |
44 | } | |
45 | if (nstops == 1) { | |
46 | do { | |
47 | putchar(' '); | |
48 | column++; | |
49 | } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); | |
50 | continue; | |
51 | } | |
52 | for (n = 0; n < nstops; n++) | |
53 | if (tabstops[n] > column) | |
54 | break; | |
55 | if (n == nstops) { | |
56 | putchar(' '); | |
57 | column++; | |
58 | continue; | |
59 | } | |
60 | while (column < tabstops[n]) { | |
61 | putchar(' '); | |
62 | column++; | |
63 | } | |
64 | continue; | |
65 | ||
66 | case '\b': | |
67 | if (column) | |
68 | column--; | |
69 | putchar('\b'); | |
70 | continue; | |
71 | ||
72 | default: | |
73 | putchar(c); | |
74 | column++; | |
75 | continue; | |
76 | ||
77 | case '\n': | |
78 | putchar(c); | |
79 | column = 0; | |
80 | continue; | |
81 | } | |
82 | } | |
83 | } while (argc > 0); | |
84 | exit(0); | |
85 | } | |
86 | ||
87 | getstops(cp) | |
88 | register char *cp; | |
89 | { | |
90 | register int i; | |
91 | ||
92 | nstops = 0; | |
93 | cp++; | |
94 | for (;;) { | |
95 | i = 0; | |
96 | while (*cp >= '0' && *cp <= '9') | |
97 | i = i * 10 + *cp++ - '0'; | |
98 | if (i <= 0 || i > 256) { | |
99 | bad: | |
100 | fprintf(stderr, "Bad tab stop spec\n"); | |
101 | exit(1); | |
102 | } | |
103 | if (nstops > 0 && i <= tabstops[nstops]) | |
104 | goto bad; | |
105 | tabstops[nstops++] = i; | |
106 | if (*cp == 0) | |
107 | break; | |
108 | if (*cp++ != ',') | |
109 | goto bad; | |
110 | } | |
111 | } |