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 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 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 47#endif /* not lint */ 48 49#include <sys/cdefs.h> 50__FBSDID("$FreeBSD: src/usr.bin/fold/fold.c,v 1.13 2004/06/24 15:12:29 tjr Exp $"); 51 52#include <err.h> 53#include <limits.h> 54#include <locale.h> 55#include <stdio.h> 56#include <stdlib.h> 57#include <string.h> 58#include <unistd.h> 59#include <wchar.h> 60#include <wctype.h> 61 62#define DEFLINEWIDTH 80 63 64void fold(int); 65static int newpos(int, wint_t); 66static void usage(void); 67 68int bflag; /* Count bytes, not columns */ 69int sflag; /* Split on word boundaries */ 70 71int 72main(int argc, char **argv) 73{ 74 int ch; 75 int rval, width; 76 char *p; 77 78 (void) setlocale(LC_CTYPE, ""); 79 80 width = -1; 81 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) 82 switch (ch) { 83 case 'b': 84 bflag = 1; 85 break; 86 case 's': 87 sflag = 1; 88 break; 89 case 'w': 90 if ((width = atoi(optarg)) <= 0) { 91 errx(1, "illegal width value"); 92 } 93 break; 94 case '0': case '1': case '2': case '3': case '4': 95 case '5': case '6': case '7': case '8': case '9': 96 if (width == -1) { 97 p = argv[optind - 1]; 98 if (p[0] == '-' && p[1] == ch && !p[2]) 99 width = atoi(++p); 100 else 101 width = atoi(argv[optind] + 1); 102 } 103 break; 104 default: 105 usage(); 106 } 107 argv += optind; 108 argc -= optind; 109 110 if (width == -1) 111 width = DEFLINEWIDTH; 112 rval = 0; 113 if (!*argv) 114 fold(width); 115 else for (; *argv; ++argv) 116 if (!freopen(*argv, "r", stdin)) { 117 warn("%s", *argv); 118 rval = 1; 119 } else 120 fold(width); 121 exit(rval); 122} 123 124static void 125usage(void) 126{ 127 (void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n"); 128 exit(1); 129} 130 131/* 132 * Fold the contents of standard input to fit within WIDTH columns (or bytes) 133 * and write to standard output. 134 * 135 * If sflag is set, split the line at the last space character on the line. 136 * This flag necessitates storing the line in a buffer until the current 137 * column > width, or a newline or EOF is read. 138 * 139 * The buffer can grow larger than WIDTH due to backspaces and carriage 140 * returns embedded in the input stream. 141 */ 142void 143fold(int width) 144{ 145 static wchar_t *buf; 146 static int buf_max; 147 int col, i, indx, space; 148 wint_t ch; 149 150 col = indx = 0; 151 while ((ch = getwchar()) != WEOF) { 152 if (ch == '\n') { 153 wprintf(L"%.*ls\n", indx, buf); 154 col = indx = 0; 155 continue; 156 } 157 if ((col = newpos(col, ch)) > width) { 158 if (sflag) { 159 i = indx; 160 while (--i >= 0 && !iswblank(buf[i])) 161 ; 162 space = i; 163 } 164 if (sflag && space != -1) { 165 space++; 166 wprintf(L"%.*ls\n", space, buf); 167 wmemmove(buf, buf + space, indx - space); 168 indx -= space; 169 col = 0; 170 for (i = 0; i < indx; i++) 171 col = newpos(col, buf[i]); 172 } else { 173 wprintf(L"%.*ls\n", indx, buf); 174 col = indx = 0; 175 } 176 col = newpos(col, ch); 177 } 178 if (indx + 1 > buf_max) { 179 buf_max += LINE_MAX; 180 buf = realloc(buf, sizeof(*buf) * buf_max); 181 if (buf == NULL) 182 err(1, "realloc()"); 183 } 184 buf[indx++] = ch; 185 } 186 187 if (ferror(stdin)) { 188 fprintf(stderr, "Input error\n"); 189 exit(EXIT_FAILURE); 190 } 191 192 if (indx != 0) 193 wprintf(L"%.*ls", indx, buf); 194} 195 196/* 197 * Update the current column position for a character. 198 */ 199static int 200newpos(int col, wint_t ch) 201{ 202 char buf[MB_LEN_MAX]; 203 size_t len; 204 int w; 205 206 if (bflag) { 207 len = wcrtomb(buf, ch, NULL); 208 col += len; 209 } else 210 switch (ch) { 211 case '\b': 212 if (col > 0) 213 --col; 214 break; 215 case '\r': 216 col = 0; 217 break; 218 case '\t': 219 col = (col + 8) & ~7; 220 break; 221 default: 222 if ((w = wcwidth(ch)) > 0) 223 col += w; 224 break; 225 } 226 227 return (col); 228} 229