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22e155fc DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
13 | #ifndef lint | |
14 | static char sccsid[] = "@(#)fold.c 5.1 (Berkeley) %G%"; | |
15 | #endif not lint | |
16 | ||
3f1c192a BJ |
17 | #include <stdio.h> |
18 | /* | |
19 | * fold - fold long lines for finite output devices | |
20 | * | |
21 | * Bill Joy UCB June 28, 1977 | |
22 | */ | |
23 | ||
24 | int fold = 80; | |
25 | ||
26 | main(argc, argv) | |
27 | int argc; | |
28 | char *argv[]; | |
29 | { | |
30 | register c; | |
31 | FILE *f; | |
3f1c192a BJ |
32 | |
33 | argc--, argv++; | |
3f1c192a BJ |
34 | if (argc > 0 && argv[0][0] == '-') { |
35 | fold = 0; | |
36 | argv[0]++; | |
37 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
474113c9 | 38 | fold *= 10, fold += *argv[0]++ - '0'; |
3f1c192a BJ |
39 | if (*argv[0]) { |
40 | printf("Bad number for fold\n"); | |
41 | exit(1); | |
42 | } | |
43 | argc--, argv++; | |
44 | } | |
45 | do { | |
46 | if (argc > 0) { | |
47 | if (freopen(argv[0], "r", stdin) == NULL) { | |
48 | perror(argv[0]); | |
49 | exit(1); | |
50 | } | |
51 | argc--, argv++; | |
52 | } | |
53 | for (;;) { | |
54 | c = getc(stdin); | |
55 | if (c == -1) | |
56 | break; | |
57 | putch(c); | |
58 | } | |
59 | } while (argc > 0); | |
60 | exit(0); | |
61 | } | |
62 | ||
63 | int col; | |
64 | ||
65 | putch(c) | |
66 | register c; | |
67 | { | |
68 | register ncol; | |
69 | ||
70 | switch (c) { | |
71 | case '\n': | |
72 | ncol = 0; | |
73 | break; | |
74 | case '\t': | |
75 | ncol = (col + 8) &~ 7; | |
76 | break; | |
77 | case '\b': | |
78 | ncol = col ? col - 1 : 0; | |
79 | break; | |
80 | case '\r': | |
81 | ncol = 0; | |
82 | break; | |
83 | default: | |
84 | ncol = col + 1; | |
85 | } | |
86 | if (ncol > fold) | |
87 | putchar('\n'), col = 0; | |
88 | putchar(c); | |
89 | switch (c) { | |
90 | case '\n': | |
91 | col = 0; | |
92 | break; | |
93 | case '\t': | |
474113c9 SL |
94 | col += 8; |
95 | col &= ~7; | |
3f1c192a BJ |
96 | break; |
97 | case '\b': | |
98 | if (col) | |
99 | col--; | |
100 | break; | |
101 | case '\r': | |
102 | col = 0; | |
103 | break; | |
104 | default: | |
105 | col++; | |
106 | break; | |
107 | } | |
108 | } |