19b50d902SRodney W. Grimes /*- 29b50d902SRodney W. Grimes * Copyright (c) 1990, 1993 39b50d902SRodney W. Grimes * The Regents of the University of California. All rights reserved. 49b50d902SRodney W. Grimes * 59b50d902SRodney W. Grimes * This code is derived from software contributed to Berkeley by 69b50d902SRodney W. Grimes * Kevin Ruddy. 79b50d902SRodney W. Grimes * 89b50d902SRodney W. Grimes * Redistribution and use in source and binary forms, with or without 99b50d902SRodney W. Grimes * modification, are permitted provided that the following conditions 109b50d902SRodney W. Grimes * are met: 119b50d902SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 129b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer. 139b50d902SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 149b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 159b50d902SRodney W. Grimes * documentation and/or other materials provided with the distribution. 169b50d902SRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 179b50d902SRodney W. Grimes * must display the following acknowledgement: 189b50d902SRodney W. Grimes * This product includes software developed by the University of 199b50d902SRodney W. Grimes * California, Berkeley and its contributors. 209b50d902SRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 219b50d902SRodney W. Grimes * may be used to endorse or promote products derived from this software 229b50d902SRodney W. Grimes * without specific prior written permission. 239b50d902SRodney W. Grimes * 249b50d902SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 259b50d902SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 269b50d902SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 279b50d902SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 289b50d902SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 299b50d902SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 309b50d902SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 319b50d902SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 329b50d902SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 339b50d902SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 349b50d902SRodney W. Grimes * SUCH DAMAGE. 359b50d902SRodney W. Grimes */ 369b50d902SRodney W. Grimes 379b50d902SRodney W. Grimes #ifndef lint 389b50d902SRodney W. Grimes static char copyright[] = 399b50d902SRodney W. Grimes "@(#) Copyright (c) 1990, 1993\n\ 409b50d902SRodney W. Grimes The Regents of the University of California. All rights reserved.\n"; 419b50d902SRodney W. Grimes #endif /* not lint */ 429b50d902SRodney W. Grimes 439b50d902SRodney W. Grimes #ifndef lint 449b50d902SRodney W. Grimes static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93"; 459b50d902SRodney W. Grimes #endif /* not lint */ 469b50d902SRodney W. Grimes 479b50d902SRodney W. Grimes #include <stdio.h> 489b50d902SRodney W. Grimes #include <string.h> 499b50d902SRodney W. Grimes 509b50d902SRodney W. Grimes #define DEFLINEWIDTH 80 519b50d902SRodney W. Grimes 529b50d902SRodney W. Grimes main(argc, argv) 539b50d902SRodney W. Grimes int argc; 549b50d902SRodney W. Grimes char **argv; 559b50d902SRodney W. Grimes { 569b50d902SRodney W. Grimes extern int errno, optind; 579b50d902SRodney W. Grimes extern char *optarg; 589b50d902SRodney W. Grimes register int ch; 599b50d902SRodney W. Grimes int width; 609b50d902SRodney W. Grimes char *p; 619b50d902SRodney W. Grimes 629b50d902SRodney W. Grimes width = -1; 639b50d902SRodney W. Grimes while ((ch = getopt(argc, argv, "0123456789w:")) != EOF) 649b50d902SRodney W. Grimes switch (ch) { 659b50d902SRodney W. Grimes case 'w': 669b50d902SRodney W. Grimes if ((width = atoi(optarg)) <= 0) { 679b50d902SRodney W. Grimes (void)fprintf(stderr, 689b50d902SRodney W. Grimes "fold: illegal width value.\n"); 699b50d902SRodney W. Grimes exit(1); 709b50d902SRodney W. Grimes } 719b50d902SRodney W. Grimes break; 729b50d902SRodney W. Grimes case '0': case '1': case '2': case '3': case '4': 739b50d902SRodney W. Grimes case '5': case '6': case '7': case '8': case '9': 749b50d902SRodney W. Grimes if (width == -1) { 759b50d902SRodney W. Grimes p = argv[optind - 1]; 769b50d902SRodney W. Grimes if (p[0] == '-' && p[1] == ch && !p[2]) 779b50d902SRodney W. Grimes width = atoi(++p); 789b50d902SRodney W. Grimes else 799b50d902SRodney W. Grimes width = atoi(argv[optind] + 1); 809b50d902SRodney W. Grimes } 819b50d902SRodney W. Grimes break; 829b50d902SRodney W. Grimes default: 839b50d902SRodney W. Grimes (void)fprintf(stderr, 849b50d902SRodney W. Grimes "usage: fold [-w width] [file ...]\n"); 859b50d902SRodney W. Grimes exit(1); 869b50d902SRodney W. Grimes } 879b50d902SRodney W. Grimes argv += optind; 889b50d902SRodney W. Grimes argc -= optind; 899b50d902SRodney W. Grimes 909b50d902SRodney W. Grimes if (width == -1) 919b50d902SRodney W. Grimes width = DEFLINEWIDTH; 929b50d902SRodney W. Grimes if (!*argv) 939b50d902SRodney W. Grimes fold(width); 949b50d902SRodney W. Grimes else for (; *argv; ++argv) 959b50d902SRodney W. Grimes if (!freopen(*argv, "r", stdin)) { 969b50d902SRodney W. Grimes (void)fprintf(stderr, 979b50d902SRodney W. Grimes "fold: %s: %s\n", *argv, strerror(errno)); 989b50d902SRodney W. Grimes exit(1); 999b50d902SRodney W. Grimes } else 1009b50d902SRodney W. Grimes fold(width); 1019b50d902SRodney W. Grimes exit(0); 1029b50d902SRodney W. Grimes } 1039b50d902SRodney W. Grimes 1049b50d902SRodney W. Grimes fold(width) 1059b50d902SRodney W. Grimes register int width; 1069b50d902SRodney W. Grimes { 1079b50d902SRodney W. Grimes register int ch, col, new; 1089b50d902SRodney W. Grimes 1099b50d902SRodney W. Grimes for (col = 0;;) { 1109b50d902SRodney W. Grimes switch (ch = getchar()) { 1119b50d902SRodney W. Grimes case EOF: 1129b50d902SRodney W. Grimes return; 1139b50d902SRodney W. Grimes case '\b': 1149b50d902SRodney W. Grimes new = col ? col - 1 : 0; 1159b50d902SRodney W. Grimes break; 1169b50d902SRodney W. Grimes case '\n': 1179b50d902SRodney W. Grimes case '\r': 1189b50d902SRodney W. Grimes new = 0; 1199b50d902SRodney W. Grimes break; 1209b50d902SRodney W. Grimes case '\t': 1219b50d902SRodney W. Grimes new = (col + 8) & ~7; 1229b50d902SRodney W. Grimes break; 1239b50d902SRodney W. Grimes default: 1249b50d902SRodney W. Grimes new = col + 1; 1259b50d902SRodney W. Grimes break; 1269b50d902SRodney W. Grimes } 1279b50d902SRodney W. Grimes 1289b50d902SRodney W. Grimes if (new > width) { 1299b50d902SRodney W. Grimes putchar('\n'); 1309b50d902SRodney W. Grimes col = 0; 1319b50d902SRodney W. Grimes } 1329b50d902SRodney W. Grimes putchar(ch); 1339b50d902SRodney W. Grimes 1349b50d902SRodney W. Grimes switch (ch) { 1359b50d902SRodney W. Grimes case '\b': 1369b50d902SRodney W. Grimes if (col > 0) 1379b50d902SRodney W. Grimes --col; 1389b50d902SRodney W. Grimes break; 1399b50d902SRodney W. Grimes case '\n': 1409b50d902SRodney W. Grimes case '\r': 1419b50d902SRodney W. Grimes col = 0; 1429b50d902SRodney W. Grimes break; 1439b50d902SRodney W. Grimes case '\t': 1449b50d902SRodney W. Grimes col += 8; 1459b50d902SRodney W. Grimes col &= ~7; 1469b50d902SRodney W. Grimes break; 1479b50d902SRodney W. Grimes default: 1489b50d902SRodney W. Grimes ++col; 1499b50d902SRodney W. Grimes break; 1509b50d902SRodney W. Grimes } 1519b50d902SRodney W. Grimes } 1529b50d902SRodney W. Grimes } 153