Commit | Line | Data |
---|---|---|
45964d3d BJ |
1 | #include <stdio.h> |
2 | /* | |
3 | * fold - fold long lines for finite output devices | |
4 | * | |
5 | * Bill Joy UCB June 28, 1977 | |
6 | */ | |
7 | ||
8 | int fold = 80; | |
9 | ||
10 | main(argc, argv) | |
11 | int argc; | |
12 | char *argv[]; | |
13 | { | |
14 | register c; | |
15 | FILE *f; | |
16 | char obuf[BUFSIZ]; | |
17 | ||
18 | argc--, argv++; | |
19 | setbuf(stdout, obuf); | |
20 | if (argc > 0 && argv[0][0] == '-') { | |
21 | fold = 0; | |
22 | argv[0]++; | |
23 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
24 | fold =* 10, fold =+ *argv[0]++ - '0'; | |
25 | if (*argv[0]) { | |
26 | printf("Bad number for fold\n"); | |
27 | exit(1); | |
28 | } | |
29 | argc--, argv++; | |
30 | } | |
31 | do { | |
32 | if (argc > 0) { | |
33 | if (freopen(argv[0], "r", stdin) == NULL) { | |
34 | perror(argv[0]); | |
35 | exit(1); | |
36 | } | |
37 | argc--, argv++; | |
38 | } | |
39 | for (;;) { | |
40 | c = getc(stdin); | |
41 | if (c == -1) | |
42 | break; | |
43 | putch(c); | |
44 | } | |
45 | } while (argc > 0); | |
46 | exit(0); | |
47 | } | |
48 | ||
49 | int col; | |
50 | ||
51 | putch(c) | |
52 | register c; | |
53 | { | |
54 | register ncol; | |
55 | ||
56 | switch (c) { | |
57 | case '\n': | |
58 | ncol = 0; | |
59 | break; | |
60 | case '\t': | |
61 | ncol = (col + 8) &~ 7; | |
62 | break; | |
63 | case '\b': | |
64 | ncol = col ? col - 1 : 0; | |
65 | break; | |
66 | case '\r': | |
67 | ncol = 0; | |
68 | break; | |
69 | default: | |
70 | ncol = col + 1; | |
71 | } | |
72 | if (ncol > fold) | |
73 | putchar('\n'), col = 0; | |
74 | putchar(c); | |
75 | switch (c) { | |
76 | case '\n': | |
77 | col = 0; | |
78 | break; | |
79 | case '\t': | |
80 | col =+ 8; | |
81 | col =& ~7; | |
82 | break; | |
83 | case '\b': | |
84 | if (col) | |
85 | col--; | |
86 | break; | |
87 | case '\r': | |
88 | col = 0; | |
89 | break; | |
90 | default: | |
91 | col++; | |
92 | break; | |
93 | } | |
94 | } |