1 /* $NetBSD: cut.c,v 1.8 1995/03/26 20:51:27 glass 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #ifndef lint 40 static char copyright[] = 41 "@(#) Copyright (c) 1989, 1993\n\ 42 The Regents of the University of California. All rights reserved.\n"; 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)cut.c 8.1 (Berkeley) 6/6/93"; 48 #else 49 static char rcsid[] = "$NetBSD: cut.c,v 1.8 1995/03/26 20:51:27 glass Exp $"; 50 #endif 51 #endif /* not lint */ 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <limits.h> 57 #include <locale.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 62 int cflag; 63 char dchar; 64 int dflag; 65 int fflag; 66 int sflag; 67 68 void c_cut __P((FILE *, char *)); 69 void f_cut __P((FILE *, char *)); 70 void get_list __P((char *)); 71 void usage __P((void)); 72 73 int 74 main(argc, argv) 75 int argc; 76 char *argv[]; 77 { 78 FILE *fp; 79 void (*fcn) __P((FILE *, char *)); 80 int ch; 81 82 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")) != EOF) 89 switch(ch) { 90 case 'b': 91 case 'c': 92 fcn = c_cut; 93 get_list(optarg); 94 cflag = 1; 95 break; 96 case 'd': 97 dchar = *optarg; 98 dflag = 1; 99 break; 100 case 'f': 101 get_list(optarg); 102 fcn = f_cut; 103 fflag = 1; 104 break; 105 case 's': 106 sflag = 1; 107 break; 108 case 'n': 109 break; 110 case '?': 111 default: 112 usage(); 113 } 114 argc -= optind; 115 argv += optind; 116 117 if (fflag) { 118 if (cflag) 119 usage(); 120 } else if (!cflag || dflag || sflag) 121 usage(); 122 123 if (*argv) 124 for (; *argv; ++argv) { 125 if (!(fp = fopen(*argv, "r"))) 126 err(1, "%s", *argv); 127 fcn(fp, *argv); 128 (void)fclose(fp); 129 } 130 else 131 fcn(stdin, "stdin"); 132 exit(0); 133 } 134 135 int autostart, autostop, maxval; 136 137 char positions[_POSIX2_LINE_MAX + 1]; 138 139 void 140 get_list(list) 141 char *list; 142 { 143 register int setautostart, start, stop; 144 register char *pos; 145 char *p; 146 147 /* 148 * set a byte in the positions array to indicate if a field or 149 * column is to be selected; use +1, it's 1-based, not 0-based. 150 * This parser is less restrictive than the Draft 9 POSIX spec. 151 * POSIX doesn't allow lists that aren't in increasing order or 152 * overlapping lists. We also handle "-3-5" although there's no 153 * real reason too. 154 */ 155 for (; p = strtok(list, ", \t"); list = NULL) { 156 setautostart = start = stop = 0; 157 if (*p == '-') { 158 ++p; 159 setautostart = 1; 160 } 161 if (isdigit(*p)) { 162 start = stop = strtol(p, &p, 10); 163 if (setautostart && start > autostart) 164 autostart = start; 165 } 166 if (*p == '-') { 167 if (isdigit(p[1])) 168 stop = strtol(p + 1, &p, 10); 169 if (*p == '-') { 170 ++p; 171 if (!autostop || autostop > stop) 172 autostop = stop; 173 } 174 } 175 if (*p) 176 errx(1, "[-cf] list: illegal list value\n"); 177 if (!stop || !start) 178 errx(1, "[-cf] list: values may not include zero\n"); 179 if (stop > _POSIX2_LINE_MAX) 180 errx(1, "[-cf] list: %d too large (max %d)\n", 181 stop, _POSIX2_LINE_MAX); 182 if (maxval < stop) 183 maxval = stop; 184 for (pos = positions + start; start++ <= stop; *pos++ = 1); 185 } 186 187 /* overlapping ranges */ 188 if (autostop && maxval > autostop) 189 maxval = autostop; 190 191 /* set autostart */ 192 if (autostart) 193 memset(positions + 1, '1', autostart); 194 } 195 196 /* ARGSUSED */ 197 void 198 c_cut(fp, fname) 199 FILE *fp; 200 char *fname; 201 { 202 register int ch, col; 203 register char *pos; 204 205 for (;;) { 206 pos = positions + 1; 207 for (col = maxval; col; --col) { 208 if ((ch = getc(fp)) == EOF) 209 return; 210 if (ch == '\n') 211 break; 212 if (*pos++) 213 (void)putchar(ch); 214 } 215 if (ch != '\n') 216 if (autostop) 217 while ((ch = getc(fp)) != EOF && ch != '\n') 218 (void)putchar(ch); 219 else 220 while ((ch = getc(fp)) != EOF && ch != '\n'); 221 (void)putchar('\n'); 222 } 223 } 224 225 void 226 f_cut(fp, fname) 227 FILE *fp; 228 char *fname; 229 { 230 register int ch, field, isdelim; 231 register char *pos, *p, sep; 232 int output; 233 char lbuf[_POSIX2_LINE_MAX + 1]; 234 235 for (sep = dchar; fgets(lbuf, sizeof(lbuf), fp);) { 236 output = 0; 237 for (isdelim = 0, p = lbuf;; ++p) { 238 if (!(ch = *p)) 239 errx(1, "%s: line too long.\n", fname); 240 /* this should work if newline is delimiter */ 241 if (ch == sep) 242 isdelim = 1; 243 if (ch == '\n') { 244 if (!isdelim && !sflag) 245 (void)printf("%s", lbuf); 246 break; 247 } 248 } 249 if (!isdelim) 250 continue; 251 252 pos = positions + 1; 253 for (field = maxval, p = lbuf; field; --field, ++pos) { 254 if (*pos) { 255 if (output++) 256 (void)putchar(sep); 257 while ((ch = *p++) != '\n' && ch != sep) 258 (void)putchar(ch); 259 } else 260 while ((ch = *p++) != '\n' && ch != sep); 261 if (ch == '\n') 262 break; 263 } 264 if (ch != '\n') 265 if (autostop) { 266 if (output) 267 (void)putchar(sep); 268 for (; (ch = *p) != '\n'; ++p) 269 (void)putchar(ch); 270 } else 271 for (; (ch = *p) != '\n'; ++p); 272 (void)putchar('\n'); 273 } 274 } 275 276 void 277 usage() 278 { 279 (void)fprintf(stderr, 280 "usage:\tcut -c list [file1 ...]\n\tcut -f list [-s] [-d delim] [file ...]\n"); 281 exit(1); 282 } 283