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Diffstat (limited to 'usr.bin/fold/fold.c')
| -rw-r--r-- | usr.bin/fold/fold.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/usr.bin/fold/fold.c b/usr.bin/fold/fold.c new file mode 100644 index 0000000..983a492 --- /dev/null +++ b/usr.bin/fold/fold.c @@ -0,0 +1,152 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kevin Ruddy. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1990, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include <stdio.h> +#include <string.h> + +#define DEFLINEWIDTH 80 + +main(argc, argv) + int argc; + char **argv; +{ + extern int errno, optind; + extern char *optarg; + register int ch; + int width; + char *p; + + width = -1; + while ((ch = getopt(argc, argv, "0123456789w:")) != EOF) + switch (ch) { + case 'w': + if ((width = atoi(optarg)) <= 0) { + (void)fprintf(stderr, + "fold: illegal width value.\n"); + exit(1); + } + break; + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + if (width == -1) { + p = argv[optind - 1]; + if (p[0] == '-' && p[1] == ch && !p[2]) + width = atoi(++p); + else + width = atoi(argv[optind] + 1); + } + break; + default: + (void)fprintf(stderr, + "usage: fold [-w width] [file ...]\n"); + exit(1); + } + argv += optind; + argc -= optind; + + if (width == -1) + width = DEFLINEWIDTH; + if (!*argv) + fold(width); + else for (; *argv; ++argv) + if (!freopen(*argv, "r", stdin)) { + (void)fprintf(stderr, + "fold: %s: %s\n", *argv, strerror(errno)); + exit(1); + } else + fold(width); + exit(0); +} + +fold(width) + register int width; +{ + register int ch, col, new; + + for (col = 0;;) { + switch (ch = getchar()) { + case EOF: + return; + case '\b': + new = col ? col - 1 : 0; + break; + case '\n': + case '\r': + new = 0; + break; + case '\t': + new = (col + 8) & ~7; + break; + default: + new = col + 1; + break; + } + + if (new > width) { + putchar('\n'); + col = 0; + } + putchar(ch); + + switch (ch) { + case '\b': + if (col > 0) + --col; + break; + case '\n': + case '\r': + col = 0; + break; + case '\t': + col += 8; + col &= ~7; + break; + default: + ++col; + break; + } + } +} |
