| 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 | } |