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1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kevin Ruddy.
7 *
8 * Redistribution and use in source and binary forms, with or without

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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
38static const char copyright[] =
39"@(#) Copyright (c) 1990, 1993\n\
40 The Regents of the University of California. All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93";
46#endif
47static const char rcsid[] =
48 "$Id$";
49#endif /* not lint */
50
51#include <err.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#define DEFLINEWIDTH 80
58
59void fold __P((int));
60static void usage __P((void));
61
62int
63main(argc, argv)
64 int argc;
65 char **argv;
66{
56 extern int errno, optind;
67 extern int optind;
68 extern char *optarg;
69 register int ch;
70 int width;
71 char *p;
72
73 width = -1;
74 while ((ch = getopt(argc, argv, "0123456789w:")) != -1)
75 switch (ch) {
76 case 'w':
77 if ((width = atoi(optarg)) <= 0) {
67 (void)fprintf(stderr,
68 "fold: illegal width value.\n");
69 exit(1);
78 errx(1, "illegal width value");
79 }
80 break;
81 case '0': case '1': case '2': case '3': case '4':
82 case '5': case '6': case '7': case '8': case '9':
83 if (width == -1) {
84 p = argv[optind - 1];
85 if (p[0] == '-' && p[1] == ch && !p[2])
86 width = atoi(++p);
87 else
88 width = atoi(argv[optind] + 1);
89 }
90 break;
91 default:
83 (void)fprintf(stderr,
84 "usage: fold [-w width] [file ...]\n");
85 exit(1);
92 usage();
93 }
94 argv += optind;
95 argc -= optind;
96
97 if (width == -1)
98 width = DEFLINEWIDTH;
99 if (!*argv)
100 fold(width);
101 else for (; *argv; ++argv)
102 if (!freopen(*argv, "r", stdin)) {
96 (void)fprintf(stderr,
97 "fold: %s: %s\n", *argv, strerror(errno));
98 exit(1);
103 err(1, "%s", *argv);
104 } else
105 fold(width);
106 exit(0);
107}
108
109static void
110usage()
111{
112 (void)fprintf(stderr, "usage: fold [-w width] [file ...]\n");
113 exit(1);
114}
115
116void
117fold(width)
118 register int width;
119{
120 register int ch, col, new;
121
122 for (col = 0;;) {
123 switch (ch = getchar()) {
124 case EOF:

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