| 1 | static char *sccsid = "@(#)unexpand.c 4.2 (Berkeley) %G%"; |
| 2 | /* |
| 3 | * unexpand - put tabs into a file replacing blanks |
| 4 | */ |
| 5 | #include <stdio.h> |
| 6 | |
| 7 | char genbuf[BUFSIZ]; |
| 8 | char linebuf[BUFSIZ]; |
| 9 | int all; |
| 10 | |
| 11 | main(argc, argv) |
| 12 | int argc; |
| 13 | char *argv[]; |
| 14 | { |
| 15 | register char *cp; |
| 16 | |
| 17 | argc--, argv++; |
| 18 | if (argc > 0 && argv[0][0] == '-') { |
| 19 | if (strcmp(argv[0], "-a") != 0) { |
| 20 | fprintf(stderr, "usage: unexpand [ -a ] file ...\n"); |
| 21 | exit(1); |
| 22 | } |
| 23 | all++; |
| 24 | argc--, argv++; |
| 25 | } |
| 26 | do { |
| 27 | if (argc > 0) { |
| 28 | if (freopen(argv[0], "r", stdin) == NULL) { |
| 29 | perror(argv[0]); |
| 30 | exit(1); |
| 31 | } |
| 32 | argc--, argv++; |
| 33 | } |
| 34 | while (fgets(genbuf, BUFSIZ, stdin) != NULL) { |
| 35 | for (cp = linebuf; *cp; cp++) |
| 36 | continue; |
| 37 | if (cp > linebuf) |
| 38 | cp[-1] = 0; |
| 39 | tabify(all); |
| 40 | printf("%s", linebuf); |
| 41 | } |
| 42 | } while (argc > 0); |
| 43 | exit(0); |
| 44 | } |
| 45 | |
| 46 | tabify(c) |
| 47 | char c; |
| 48 | { |
| 49 | register char *cp, *dp; |
| 50 | register int dcol; |
| 51 | int ocol; |
| 52 | |
| 53 | ocol = 0; |
| 54 | dcol = 0; |
| 55 | cp = genbuf, dp = linebuf; |
| 56 | for (;;) { |
| 57 | switch (*cp) { |
| 58 | |
| 59 | case ' ': |
| 60 | dcol++; |
| 61 | break; |
| 62 | |
| 63 | case '\t': |
| 64 | dcol += 8; |
| 65 | dcol &= ~07; |
| 66 | break; |
| 67 | |
| 68 | default: |
| 69 | while (((ocol + 8) &~ 07) <= dcol) { |
| 70 | if (ocol + 1 == dcol) |
| 71 | break; |
| 72 | *dp++ = '\t'; |
| 73 | ocol += 8; |
| 74 | ocol &= ~07; |
| 75 | } |
| 76 | while (ocol < dcol) { |
| 77 | *dp++ = ' '; |
| 78 | ocol++; |
| 79 | } |
| 80 | if (*cp == 0 || c == 0) { |
| 81 | strcpy(dp, cp); |
| 82 | return; |
| 83 | } |
| 84 | *dp++ = *cp; |
| 85 | ocol++, dcol++; |
| 86 | } |
| 87 | cp++; |
| 88 | } |
| 89 | } |