cut.c revision 1.29
1 /* $NetBSD: cut.c,v 1.29 2014/02/03 20:22:19 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 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 * Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue. 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) 1989, 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[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95"; 44 #endif 45 __RCSID("$NetBSD: cut.c,v 1.29 2014/02/03 20:22:19 wiz Exp $"); 46 #endif /* not lint */ 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <limits.h> 52 #include <locale.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <util.h> 58 #include <wchar.h> 59 #include <sys/param.h> 60 61 static int bflag; 62 static int cflag; 63 static char dchar; 64 static int dflag; 65 static int fflag; 66 static int sflag; 67 68 static void b_cut(FILE *, const char *); 69 static void c_cut(FILE *, const char *); 70 static void f_cut(FILE *, const char *); 71 static void get_list(char *); 72 static void usage(void) __dead; 73 74 int 75 main(int argc, char *argv[]) 76 { 77 FILE *fp; 78 void (*fcn)(FILE *, const char *); 79 int ch, rval; 80 81 fcn = NULL; 82 (void)setlocale(LC_ALL, ""); 83 84 dchar = '\t'; /* default delimiter is \t */ 85 86 /* Since we don't support multi-byte characters, the -c and -b 87 options are equivalent, and the -n option is meaningless. */ 88 while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1) 89 switch(ch) { 90 case 'b': 91 fcn = b_cut; 92 get_list(optarg); 93 bflag = 1; 94 break; 95 case 'c': 96 fcn = c_cut; 97 get_list(optarg); 98 cflag = 1; 99 break; 100 case 'd': 101 dchar = *optarg; 102 dflag = 1; 103 break; 104 case 'f': 105 get_list(optarg); 106 fcn = f_cut; 107 fflag = 1; 108 break; 109 case 's': 110 sflag = 1; 111 break; 112 case 'n': 113 break; 114 case '?': 115 default: 116 usage(); 117 } 118 argc -= optind; 119 argv += optind; 120 121 if (fflag) { 122 if (cflag || bflag) 123 usage(); 124 } else if ((!cflag && !bflag) || dflag || sflag) 125 usage(); 126 else if (bflag && cflag) 127 usage(); 128 129 rval = 0; 130 if (*argv) 131 for (; *argv; ++argv) { 132 if (strcmp(*argv, "-") == 0) 133 fcn(stdin, "stdin"); 134 else { 135 if ((fp = fopen(*argv, "r"))) { 136 fcn(fp, *argv); 137 (void)fclose(fp); 138 } else { 139 rval = 1; 140 warn("%s", *argv); 141 } 142 } 143 } 144 else 145 fcn(stdin, "stdin"); 146 return(rval); 147 } 148 149 static size_t autostart, autostop, maxval; 150 151 static char *positions = NULL; 152 static size_t numpositions = 0; 153 #define ALLOC_CHUNK _POSIX2_LINE_MAX /* malloc granularity */ 154 155 static void 156 get_list(char *list) 157 { 158 size_t setautostart, start, stop; 159 char *pos; 160 char *p; 161 162 if (positions == NULL) { 163 numpositions = ALLOC_CHUNK; 164 positions = ecalloc(numpositions, sizeof(*positions)); 165 } 166 167 /* 168 * set a byte in the positions array to indicate if a field or 169 * column is to be selected; use +1, it's 1-based, not 0-based. 170 * This parser is less restrictive than the Draft 9 POSIX spec. 171 * POSIX doesn't allow lists that aren't in increasing order or 172 * overlapping lists. We also handle "-3-5" although there's no 173 * real reason to. 174 */ 175 for (; (p = strtok(list, ", \t")) != NULL; list = NULL) { 176 setautostart = start = stop = 0; 177 if (*p == '-') { 178 ++p; 179 setautostart = 1; 180 } 181 if (isdigit((unsigned char)*p)) { 182 start = stop = strtol(p, &p, 10); 183 if (setautostart && start > autostart) 184 autostart = start; 185 } 186 if (*p == '-') { 187 if (isdigit((unsigned char)p[1])) 188 stop = strtol(p + 1, &p, 10); 189 if (*p == '-') { 190 ++p; 191 if (!autostop || autostop > stop) 192 autostop = stop; 193 } 194 } 195 if (*p) 196 errx(1, "[-bcf] list: illegal list value"); 197 if (!stop || !start) 198 errx(1, "[-bcf] list: values may not include zero"); 199 if (stop + 1 > numpositions) { 200 size_t newsize; 201 newsize = roundup(stop + 1, ALLOC_CHUNK); 202 positions = erealloc(positions, newsize); 203 (void)memset(positions + numpositions, 0, 204 newsize - numpositions); 205 numpositions = newsize; 206 } 207 if (maxval < stop) 208 maxval = stop; 209 for (pos = positions + start; start++ <= stop; pos++) 210 *pos = 1; 211 } 212 213 /* overlapping ranges */ 214 if (autostop && maxval > autostop) 215 maxval = autostop; 216 217 /* set autostart */ 218 if (autostart) 219 (void)memset(positions + 1, '1', autostart); 220 } 221 222 static void 223 /*ARGSUSED*/ 224 f_cut(FILE *fp, const char *fname __unused) 225 { 226 int ch, field, isdelim; 227 char *pos, *p, sep; 228 int output; 229 size_t len; 230 char *lbuf, *tbuf; 231 232 for (sep = dchar, tbuf = NULL; (lbuf = fgetln(fp, &len)) != NULL;) { 233 output = 0; 234 if (lbuf[len - 1] != '\n') { 235 /* no newline at the end of the last line so add one */ 236 if ((tbuf = (char *)malloc(len + 1)) == NULL) 237 err(1, NULL); 238 (void)memcpy(tbuf, lbuf, len); 239 tbuf[len++] = '\n'; 240 lbuf = tbuf; 241 } 242 for (isdelim = 0, p = lbuf;; ++p) { 243 ch = *p; 244 /* this should work if newline is delimiter */ 245 if (ch == sep) 246 isdelim = 1; 247 if (ch == '\n') { 248 if (!isdelim && !sflag) 249 (void)fwrite(lbuf, len, 1, stdout); 250 break; 251 } 252 } 253 if (!isdelim) 254 continue; 255 256 pos = positions + 1; 257 for (field = maxval, p = lbuf; field; --field, ++pos) { 258 if (*pos) { 259 if (output++) 260 (void)putchar(sep); 261 while ((ch = *p++) != '\n' && ch != sep) 262 (void)putchar(ch); 263 } else { 264 while ((ch = *p++) != '\n' && ch != sep) 265 continue; 266 } 267 if (ch == '\n') 268 break; 269 } 270 if (ch != '\n') { 271 if (autostop) { 272 if (output) 273 (void)putchar(sep); 274 for (; (ch = *p) != '\n'; ++p) 275 (void)putchar(ch); 276 } else 277 for (; (ch = *p) != '\n'; ++p); 278 } 279 (void)putchar('\n'); 280 if (tbuf) { 281 free(tbuf); 282 tbuf = NULL; 283 } 284 } 285 if (tbuf) 286 free(tbuf); 287 } 288 289 static void 290 usage(void) 291 { 292 (void)fprintf(stderr, "usage:\tcut -b list [-n] [file ...]\n" 293 "\tcut -c list [file ...]\n" 294 "\tcut -f list [-d string] [-s] [file ...]\n"); 295 exit(1); 296 } 297 298 /* make b_put(): */ 299 #define CUT_BYTE 1 300 #include "x_cut.c" 301 #undef CUT_BYTE 302 303 /* make c_put(): */ 304 #define CUT_BYTE 0 305 #include "x_cut.c" 306 #undef CUT_BYTE 307
Indexes created Wed Sep 24 22:09:59 GMT 2025