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1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
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3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
22e155fc DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
20 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ | |
21 | All rights reserved.\n"; | |
5e8b0e60 | 22 | #endif /* not lint */ |
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23 | |
24 | #ifndef lint | |
5e8b0e60 KB |
25 | static char sccsid[] = "@(#)fold.c 5.2 (Berkeley) %G%"; |
26 | #endif /* not lint */ | |
22e155fc | 27 | |
3f1c192a BJ |
28 | #include <stdio.h> |
29 | /* | |
30 | * fold - fold long lines for finite output devices | |
31 | * | |
32 | * Bill Joy UCB June 28, 1977 | |
33 | */ | |
34 | ||
35 | int fold = 80; | |
36 | ||
37 | main(argc, argv) | |
38 | int argc; | |
39 | char *argv[]; | |
40 | { | |
41 | register c; | |
42 | FILE *f; | |
3f1c192a BJ |
43 | |
44 | argc--, argv++; | |
3f1c192a BJ |
45 | if (argc > 0 && argv[0][0] == '-') { |
46 | fold = 0; | |
47 | argv[0]++; | |
48 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
474113c9 | 49 | fold *= 10, fold += *argv[0]++ - '0'; |
3f1c192a BJ |
50 | if (*argv[0]) { |
51 | printf("Bad number for fold\n"); | |
52 | exit(1); | |
53 | } | |
54 | argc--, argv++; | |
55 | } | |
56 | do { | |
57 | if (argc > 0) { | |
58 | if (freopen(argv[0], "r", stdin) == NULL) { | |
59 | perror(argv[0]); | |
60 | exit(1); | |
61 | } | |
62 | argc--, argv++; | |
63 | } | |
64 | for (;;) { | |
65 | c = getc(stdin); | |
66 | if (c == -1) | |
67 | break; | |
68 | putch(c); | |
69 | } | |
70 | } while (argc > 0); | |
71 | exit(0); | |
72 | } | |
73 | ||
74 | int col; | |
75 | ||
76 | putch(c) | |
77 | register c; | |
78 | { | |
79 | register ncol; | |
80 | ||
81 | switch (c) { | |
82 | case '\n': | |
83 | ncol = 0; | |
84 | break; | |
85 | case '\t': | |
86 | ncol = (col + 8) &~ 7; | |
87 | break; | |
88 | case '\b': | |
89 | ncol = col ? col - 1 : 0; | |
90 | break; | |
91 | case '\r': | |
92 | ncol = 0; | |
93 | break; | |
94 | default: | |
95 | ncol = col + 1; | |
96 | } | |
97 | if (ncol > fold) | |
98 | putchar('\n'), col = 0; | |
99 | putchar(c); | |
100 | switch (c) { | |
101 | case '\n': | |
102 | col = 0; | |
103 | break; | |
104 | case '\t': | |
474113c9 SL |
105 | col += 8; |
106 | col &= ~7; | |
3f1c192a BJ |
107 | break; |
108 | case '\b': | |
109 | if (col) | |
110 | col--; | |
111 | break; | |
112 | case '\r': | |
113 | col = 0; | |
114 | break; | |
115 | default: | |
116 | col++; | |
117 | break; | |
118 | } | |
119 | } |