1 /* $NetBSD: fold.c,v 1.17 2011/09/04 20:24:59 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kevin Ruddy. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1990, 1993\ 38 The Regents of the University of California. All rights reserved."); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)fold.c 8.1 (Berkeley) 6/6/93"; 44 #endif 45 __RCSID("$NetBSD: fold.c,v 1.17 2011/09/04 20:24:59 joerg Exp $"); 46 #endif /* not lint */ 47 48 #include <limits.h> 49 #include <locale.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <wchar.h> 54 #include <err.h> 55 56 #define DEFLINEWIDTH 80 57 58 static void fold(int); 59 static int new_column_position(int, wint_t); 60 __dead static void usage(void); 61 62 static int count_bytes = 0; 63 static int split_words = 0; 64 65 int 66 main(int argc, char **argv) 67 { 68 int ch; 69 int width; 70 char *p; 71 72 setlocale(LC_CTYPE, ""); 73 setprogname(argv[0]); 74 75 width = -1; 76 while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) 77 switch (ch) { 78 case 'b': 79 count_bytes = 1; 80 break; 81 case 's': 82 split_words = 1; 83 break; 84 case 'w': 85 if ((width = atoi(optarg)) <= 0) 86 errx(1, "illegal width value"); 87 break; 88 case '0': case '1': case '2': case '3': case '4': 89 case '5': case '6': case '7': case '8': case '9': 90 if (width == -1) { 91 p = argv[optind - 1]; 92 if (p[0] == '-' && p[1] == ch && !p[2]) 93 width = atoi(++p); 94 else 95 width = atoi(argv[optind] + 1); 96 } 97 break; 98 default: 99 usage(); 100 } 101 argv += optind; 102 argc -= optind; 103 104 if (width == -1) 105 width = DEFLINEWIDTH; 106 107 if (!*argv) 108 fold(width); 109 else for (; *argv; ++argv) 110 if (!freopen(*argv, "r", stdin)) { 111 err (1, "%s", *argv); 112 /* NOTREACHED */ 113 } else 114 fold(width); 115 exit(0); 116 } 117 118 /* 119 * Fold the contents of standard input to fit within WIDTH columns 120 * (or bytes) and write to standard output. 121 * 122 * If split_words is set, split the line at the last space character 123 * on the line. This flag necessitates storing the line in a buffer 124 * until the current column > width, or a newline or EOF is read. 125 * 126 * The buffer can grow larger than WIDTH due to backspaces and carriage 127 * returns embedded in the input stream. 128 */ 129 static void 130 fold(int width) 131 { 132 static wchar_t *buf = NULL; 133 wchar_t *nbuf; 134 static int buf_max = 0; 135 wint_t ch; 136 int col, indx, i; 137 138 col = indx = 0; 139 while ((ch = getwchar()) != WEOF) { 140 if (ch == L'\n') { 141 if (indx != 0) { 142 for (i = 0; i < indx; i++) 143 putwchar(buf[i]); 144 } 145 putwchar(L'\n'); 146 col = indx = 0; 147 continue; 148 } 149 150 col = new_column_position (col, ch); 151 if (col > width) { 152 int last_space; 153 154 #ifdef __GNUC__ 155 last_space = 0; /* XXX gcc */ 156 #endif 157 if (split_words) { 158 for (i = 0, last_space = -1; i < indx; i++) 159 if (buf[i] == L' ') 160 last_space = i; 161 } 162 163 if (split_words && last_space != -1) { 164 for (i = 0; i < last_space; i++) 165 putwchar(buf[i]); 166 167 /* increase last_space here, so we skip trailing whitespace */ 168 last_space++; 169 wmemmove (buf, buf+last_space, indx-last_space); 170 171 indx -= last_space; 172 col = 0; 173 for (i = 0; i < indx; i++) { 174 col = new_column_position (col, buf[i]); 175 } 176 } else { 177 for (i = 0; i < indx; i++) 178 putwchar(buf[i]); 179 col = indx = 0; 180 } 181 putwchar('\n'); 182 183 /* calculate the column position for the next line. */ 184 col = new_column_position (col, ch); 185 } 186 187 if (indx + 1 > buf_max) { 188 /* Allocate buffer in LINE_MAX increments */ 189 if ((nbuf = realloc (buf, buf_max + 2048)) == NULL) { 190 err (1, "realloc"); 191 /* NOTREACHED */ 192 } 193 buf = nbuf; 194 buf_max += 2048; 195 } 196 buf[indx++] = ch; 197 } 198 199 if (indx != 0) { 200 for (i = 0; i < indx; i++) 201 putwchar(buf[i]); 202 } 203 } 204 205 /* 206 * calculate the column position 207 */ 208 static int 209 new_column_position (int col, wint_t ch) 210 { 211 int w; 212 213 if (!count_bytes) { 214 switch (ch) { 215 case L'\b': 216 if (col > 0) 217 --col; 218 break; 219 case L'\r': 220 col = 0; 221 break; 222 case L'\t': 223 col = (col + 8) & ~7; 224 break; 225 default: 226 w = wcwidth(ch); 227 if (w > 0) 228 col += w; 229 break; 230 } 231 } else { 232 char dummy[MB_LEN_MAX]; 233 234 /* XXX: we assume stateless encoding */ 235 col += wcrtomb(dummy, ch, NULL); 236 } 237 238 return col; 239 } 240 241 static void 242 usage(void) 243 { 244 (void)fprintf(stderr, 245 "usage: %s [-bs] [-w width] [file ...]\n", getprogname()); 246 exit(1); 247 } 248 249