Commit | Line | Data |
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474113c9 | 1 | static char *sccsid = "@(#)fold.c 4.2 (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; | |
17 | char obuf[BUFSIZ]; | |
18 | ||
19 | argc--, argv++; | |
20 | setbuf(stdout, obuf); | |
21 | if (argc > 0 && argv[0][0] == '-') { | |
22 | fold = 0; | |
23 | argv[0]++; | |
24 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
474113c9 | 25 | fold *= 10, fold += *argv[0]++ - '0'; |
3f1c192a BJ |
26 | if (*argv[0]) { |
27 | printf("Bad number for fold\n"); | |
28 | exit(1); | |
29 | } | |
30 | argc--, argv++; | |
31 | } | |
32 | do { | |
33 | if (argc > 0) { | |
34 | if (freopen(argv[0], "r", stdin) == NULL) { | |
35 | perror(argv[0]); | |
36 | exit(1); | |
37 | } | |
38 | argc--, argv++; | |
39 | } | |
40 | for (;;) { | |
41 | c = getc(stdin); | |
42 | if (c == -1) | |
43 | break; | |
44 | putch(c); | |
45 | } | |
46 | } while (argc > 0); | |
47 | exit(0); | |
48 | } | |
49 | ||
50 | int col; | |
51 | ||
52 | putch(c) | |
53 | register c; | |
54 | { | |
55 | register ncol; | |
56 | ||
57 | switch (c) { | |
58 | case '\n': | |
59 | ncol = 0; | |
60 | break; | |
61 | case '\t': | |
62 | ncol = (col + 8) &~ 7; | |
63 | break; | |
64 | case '\b': | |
65 | ncol = col ? col - 1 : 0; | |
66 | break; | |
67 | case '\r': | |
68 | ncol = 0; | |
69 | break; | |
70 | default: | |
71 | ncol = col + 1; | |
72 | } | |
73 | if (ncol > fold) | |
74 | putchar('\n'), col = 0; | |
75 | putchar(c); | |
76 | switch (c) { | |
77 | case '\n': | |
78 | col = 0; | |
79 | break; | |
80 | case '\t': | |
474113c9 SL |
81 | col += 8; |
82 | col &= ~7; | |
3f1c192a BJ |
83 | break; |
84 | case '\b': | |
85 | if (col) | |
86 | col--; | |
87 | break; | |
88 | case '\r': | |
89 | col = 0; | |
90 | break; | |
91 | default: | |
92 | col++; | |
93 | break; | |
94 | } | |
95 | } |