[unix-history] / usr.bin / fold / fold.c

/*-
 * Copyright (c) 1990 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
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)fold.c	5.5 (Berkeley) 6/1/90";
#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;
		}
	}
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* 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
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	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
	38	char copyright[] =
	39	"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
	40	All rights reserved.\n";
	41	#endif /* not lint */
	42
	43	#ifndef lint
	44	static char sccsid[] = "@(#)fold.c 5.5 (Berkeley) 6/1/90";
	45	#endif /* not lint */
	46
	47	#include <stdio.h>
	48	#include <string.h>
	49
	50	#define DEFLINEWIDTH 80
	51
	52	main(argc, argv)
	53	int argc;
	54	char **argv;
	55	{
	56	extern int errno, optind;
	57	extern char *optarg;
	58	register int ch;
	59	int width;
	60	char *p;
	61
	62	width = -1;
	63	while ((ch = getopt(argc, argv, "0123456789w:")) != EOF)
	64	switch (ch) {
65	case 'w':
66	if ((width = atoi(optarg)) <= 0) {
67	(void)fprintf(stderr,
68	"fold: illegal width value.\n");
69	exit(1);
70	}
71	break;
72	case '0': case '1': case '2': case '3': case '4':
73	case '5': case '6': case '7': case '8': case '9':
74	if (width == -1) {
75	p = argv[optind - 1];
76	if (p[0] == '-' && p[1] == ch && !p[2])
77	width = atoi(++p);
78	else
79	width = atoi(argv[optind] + 1);
80	}
81	break;
82	default:
83	(void)fprintf(stderr,
84	"usage: fold [-w width] [file ...]\n");
85	exit(1);
86	}
87	argv += optind;
88	argc -= optind;
89
90	if (width == -1)
91	width = DEFLINEWIDTH;
92	if (!*argv)
93	fold(width);
94	else for (; *argv; ++argv)
95	if (!freopen(*argv, "r", stdin)) {
96	(void)fprintf(stderr,
97	"fold: %s: %s\n", *argv, strerror(errno));
98	exit(1);
99	} else
100	fold(width);
101	exit(0);
102	}
103
104	fold(width)
105	register int width;
106	{
107	register int ch, col, new;
108
109	for (col = 0;;) {
110	switch (ch = getchar()) {
111	case EOF:
112	return;
113	case '\b':
114	new = col ? col - 1 : 0;
115	break;
116	case '\n':
117	case '\r':
118	new = 0;
119	break;
120	case '\t':
121	new = (col + 8) & ~7;
122	break;
123	default:
124	new = col + 1;
125	break;
126	}
127
128	if (new > width) {
129	putchar('\n');
130	col = 0;
131	}
132	putchar(ch);
133
134	switch (ch) {
135	case '\b':
136	if (col > 0)
137	--col;
138	break;
139	case '\n':
140	case '\r':
141	col = 0;
142	break;
143	case '\t':
144	col += 8;
145	col &= ~7;
146	break;
147	default:
148	++col;
149	break;
150	}
151	}
152	}