Commit | Line | Data |
---|---|---|
32a94702 | 1 | static char *sccsid = "@(#)fold.c 4.3 (Berkeley) %G%"; |
3f1c192a BJ |
2 | #include <stdio.h> |
3 | /* | |
4 | * fold - fold long lines for finite output devices | |
5 | * | |
6 | * Bill Joy UCB June 28, 1977 | |
7 | */ | |
8 | ||
9 | int fold = 80; | |
10 | ||
11 | main(argc, argv) | |
12 | int argc; | |
13 | char *argv[]; | |
14 | { | |
15 | register c; | |
16 | FILE *f; | |
3f1c192a BJ |
17 | |
18 | argc--, argv++; | |
3f1c192a BJ |
19 | if (argc > 0 && argv[0][0] == '-') { |
20 | fold = 0; | |
21 | argv[0]++; | |
22 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
474113c9 | 23 | fold *= 10, fold += *argv[0]++ - '0'; |
3f1c192a BJ |
24 | if (*argv[0]) { |
25 | printf("Bad number for fold\n"); | |
26 | exit(1); | |
27 | } | |
28 | argc--, argv++; | |
29 | } | |
30 | do { | |
31 | if (argc > 0) { | |
32 | if (freopen(argv[0], "r", stdin) == NULL) { | |
33 | perror(argv[0]); | |
34 | exit(1); | |
35 | } | |
36 | argc--, argv++; | |
37 | } | |
38 | for (;;) { | |
39 | c = getc(stdin); | |
40 | if (c == -1) | |
41 | break; | |
42 | putch(c); | |
43 | } | |
44 | } while (argc > 0); | |
45 | exit(0); | |
46 | } | |
47 | ||
48 | int col; | |
49 | ||
50 | putch(c) | |
51 | register c; | |
52 | { | |
53 | register ncol; | |
54 | ||
55 | switch (c) { | |
56 | case '\n': | |
57 | ncol = 0; | |
58 | break; | |
59 | case '\t': | |
60 | ncol = (col + 8) &~ 7; | |
61 | break; | |
62 | case '\b': | |
63 | ncol = col ? col - 1 : 0; | |
64 | break; | |
65 | case '\r': | |
66 | ncol = 0; | |
67 | break; | |
68 | default: | |
69 | ncol = col + 1; | |
70 | } | |
71 | if (ncol > fold) | |
72 | putchar('\n'), col = 0; | |
73 | putchar(c); | |
74 | switch (c) { | |
75 | case '\n': | |
76 | col = 0; | |
77 | break; | |
78 | case '\t': | |
474113c9 SL |
79 | col += 8; |
80 | col &= ~7; | |
3f1c192a BJ |
81 | break; |
82 | case '\b': | |
83 | if (col) | |
84 | col--; | |
85 | break; | |
86 | case '\r': | |
87 | col = 0; | |
88 | break; | |
89 | default: | |
90 | col++; | |
91 | break; | |
92 | } | |
93 | } |