Annotation of src/usr.bin/cut/cut.c, Revision 1.23
1.23 ! schwarze 1: /* $OpenBSD: cut.c,v 1.22 2015/11/03 04:57:20 mmcc Exp $ */
1.1 deraadt 2: /* $NetBSD: cut.c,v 1.9 1995/09/02 05:59:23 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.10 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
1.23 ! schwarze 36: #include <assert.h>
1.1 deraadt 37: #include <ctype.h>
38: #include <err.h>
39: #include <errno.h>
40: #include <limits.h>
41: #include <locale.h>
42: #include <stdio.h>
43: #include <stdlib.h>
44: #include <string.h>
45: #include <unistd.h>
46:
1.23 ! schwarze 47: char dchar[5];
! 48: int dlen;
! 49:
! 50: int bflag;
1.1 deraadt 51: int cflag;
52: int dflag;
53: int fflag;
1.23 ! schwarze 54: int nflag;
1.1 deraadt 55: int sflag;
56:
1.23 ! schwarze 57: void b_cut(FILE *, char *);
1.9 millert 58: void c_cut(FILE *, char *);
59: void f_cut(FILE *, char *);
60: void get_list(char *);
61: void usage(void);
1.1 deraadt 62:
63: int
1.11 deraadt 64: main(int argc, char *argv[])
1.1 deraadt 65: {
66: FILE *fp;
1.9 millert 67: void (*fcn)(FILE *, char *);
1.18 sobrado 68: int ch, rval;
1.1 deraadt 69:
1.23 ! schwarze 70: setlocale(LC_CTYPE, "");
1.1 deraadt 71:
1.21 deraadt 72: if (pledge("stdio rpath", NULL) == -1)
73: err(1, "pledge");
1.20 deraadt 74:
1.23 ! schwarze 75: dchar[0] = '\t'; /* default delimiter */
! 76: dchar[1] = '\0';
! 77: dlen = 1;
1.1 deraadt 78:
1.3 millert 79: while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
1.1 deraadt 80: switch(ch) {
81: case 'b':
1.23 ! schwarze 82: get_list(optarg);
! 83: bflag = 1;
! 84: break;
1.1 deraadt 85: case 'c':
86: get_list(optarg);
87: cflag = 1;
88: break;
89: case 'd':
1.23 ! schwarze 90: if ((dlen = mblen(optarg, MB_CUR_MAX)) == -1)
! 91: usage();
! 92: assert(dlen < sizeof(dchar));
! 93: (void)memcpy(dchar, optarg, dlen);
! 94: dchar[dlen] = '\0';
1.1 deraadt 95: dflag = 1;
96: break;
97: case 'f':
98: get_list(optarg);
99: fflag = 1;
100: break;
1.23 ! schwarze 101: case 'n':
! 102: nflag = 1;
! 103: break;
1.1 deraadt 104: case 's':
105: sflag = 1;
106: break;
107: case '?':
108: default:
109: usage();
110: }
111: argc -= optind;
112: argv += optind;
113:
1.23 ! schwarze 114: if (bflag + cflag + fflag != 1 ||
! 115: (nflag && !bflag) ||
! 116: ((dflag || sflag) && !fflag))
1.1 deraadt 117: usage();
118:
1.23 ! schwarze 119: if (MB_CUR_MAX == 1) {
! 120: nflag = 0;
! 121: if (cflag) {
! 122: bflag = 1;
! 123: cflag = 0;
! 124: }
! 125: }
! 126:
! 127: fcn = fflag ? f_cut : (cflag || nflag) ? c_cut : b_cut;
! 128:
1.18 sobrado 129: rval = 0;
1.1 deraadt 130: if (*argv)
131: for (; *argv; ++argv) {
1.17 sobrado 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 {
1.18 sobrado 139: rval = 1;
1.17 sobrado 140: warn("%s", *argv);
141: }
142: }
1.1 deraadt 143: }
1.20 deraadt 144: else {
1.21 deraadt 145: if (pledge("stdio rpath", NULL) == -1)
146: err(1, "pledge");
1.22 mmcc 147:
1.1 deraadt 148: fcn(stdin, "stdin");
1.20 deraadt 149: }
1.18 sobrado 150: exit(rval);
1.1 deraadt 151: }
152:
153: int autostart, autostop, maxval;
154:
155: char positions[_POSIX2_LINE_MAX + 1];
156:
157: void
1.11 deraadt 158: get_list(char *list)
1.1 deraadt 159: {
1.8 mpech 160: int setautostart, start, stop;
161: char *pos;
1.1 deraadt 162: char *p;
163:
164: /*
165: * set a byte in the positions array to indicate if a field or
166: * column is to be selected; use +1, it's 1-based, not 0-based.
167: * This parser is less restrictive than the Draft 9 POSIX spec.
168: * POSIX doesn't allow lists that aren't in increasing order or
169: * overlapping lists. We also handle "-3-5" although there's no
170: * real reason too.
171: */
1.7 aaron 172: while ((p = strsep(&list, ", \t"))) {
1.1 deraadt 173: setautostart = start = stop = 0;
174: if (*p == '-') {
175: ++p;
176: setautostart = 1;
177: }
1.16 deraadt 178: if (isdigit((unsigned char)*p)) {
1.1 deraadt 179: start = stop = strtol(p, &p, 10);
180: if (setautostart && start > autostart)
181: autostart = start;
182: }
183: if (*p == '-') {
1.16 deraadt 184: if (isdigit((unsigned char)p[1]))
1.1 deraadt 185: stop = strtol(p + 1, &p, 10);
186: if (*p == '-') {
187: ++p;
188: if (!autostop || autostop > stop)
189: autostop = stop;
190: }
191: }
192: if (*p)
1.15 schwarze 193: errx(1, "[-bcf] list: illegal list value");
1.1 deraadt 194: if (!stop || !start)
1.15 schwarze 195: errx(1, "[-bcf] list: values may not include zero");
1.1 deraadt 196: if (stop > _POSIX2_LINE_MAX)
1.15 schwarze 197: errx(1, "[-bcf] list: %d too large (max %d)",
1.1 deraadt 198: stop, _POSIX2_LINE_MAX);
199: if (maxval < stop)
200: maxval = stop;
1.7 aaron 201: for (pos = positions + start; start++ <= stop; *pos++ = 1)
202: ;
1.1 deraadt 203: }
204:
205: /* overlapping ranges */
206: if (autostop && maxval > autostop)
207: maxval = autostop;
208:
209: /* set autostart */
210: if (autostart)
211: memset(positions + 1, '1', autostart);
212: }
213:
214: /* ARGSUSED */
215: void
1.23 ! schwarze 216: b_cut(FILE *fp, char *fname)
1.1 deraadt 217: {
1.8 mpech 218: int ch, col;
219: char *pos;
1.1 deraadt 220:
221: for (;;) {
222: pos = positions + 1;
223: for (col = maxval; col; --col) {
224: if ((ch = getc(fp)) == EOF)
225: return;
226: if (ch == '\n')
227: break;
228: if (*pos++)
229: (void)putchar(ch);
230: }
1.7 aaron 231: if (ch != '\n') {
1.1 deraadt 232: if (autostop)
233: while ((ch = getc(fp)) != EOF && ch != '\n')
234: (void)putchar(ch);
235: else
1.7 aaron 236: while ((ch = getc(fp)) != EOF && ch != '\n')
237: ;
238: }
1.1 deraadt 239: (void)putchar('\n');
240: }
241: }
242:
243: void
1.23 ! schwarze 244: c_cut(FILE *fp, char *fname)
1.1 deraadt 245: {
1.23 ! schwarze 246: static char *line = NULL;
! 247: static size_t linesz = 0;
! 248: ssize_t linelen;
! 249: char *cp, *pos, *maxpos;
! 250: int len;
! 251:
! 252: while ((linelen = getline(&line, &linesz, fp)) != -1) {
! 253: if (line[linelen - 1] == '\n')
! 254: line[linelen - 1] = '\0';
1.1 deraadt 255:
1.23 ! schwarze 256: cp = line;
! 257: pos = positions + 1;
! 258: maxpos = pos + maxval;
! 259: while(pos < maxpos && *cp != '\0') {
! 260: len = mblen(cp, MB_CUR_MAX);
! 261: if (len == -1)
! 262: len = 1;
! 263: pos += nflag ? len : 1;
! 264: if (pos[-1] == '\0')
! 265: cp += len;
! 266: else
! 267: while (len--)
! 268: putchar(*cp++);
1.1 deraadt 269: }
1.23 ! schwarze 270: if (autostop)
! 271: puts(cp);
! 272: else
! 273: putchar('\n');
! 274: }
! 275: }
! 276:
! 277: void
! 278: f_cut(FILE *fp, char *fname)
! 279: {
! 280: static char *line = NULL;
! 281: static size_t linesz = 0;
! 282: ssize_t linelen;
! 283: char *sp, *ep, *pos, *maxpos;
! 284: int output;
! 285:
! 286: while ((linelen = getline(&line, &linesz, fp)) != -1) {
! 287: if (line[linelen - 1] == '\n')
! 288: line[linelen - 1] = '\0';
! 289:
! 290: if ((ep = strstr(line, dchar)) == NULL) {
! 291: if (!sflag)
! 292: puts(line);
1.1 deraadt 293: continue;
1.23 ! schwarze 294: }
1.1 deraadt 295:
296: pos = positions + 1;
1.23 ! schwarze 297: maxpos = pos + maxval;
! 298: output = 0;
! 299: sp = line;
! 300: for (;;) {
! 301: if (*pos++) {
! 302: if (output)
! 303: fputs(dchar, stdout);
! 304: while (sp < ep)
! 305: putchar(*sp++);
! 306: output = 1;
1.1 deraadt 307: } else
1.23 ! schwarze 308: sp = ep;
! 309: if (*sp == '\0' || pos == maxpos)
1.1 deraadt 310: break;
1.23 ! schwarze 311: sp += dlen;
! 312: if ((ep = strstr(sp, dchar)) == NULL)
! 313: ep = strchr(sp, '\0');
! 314: }
! 315: if (autostop)
! 316: puts(sp);
! 317: else
! 318: putchar('\n');
1.1 deraadt 319: }
320: }
321:
322: void
1.11 deraadt 323: usage(void)
1.1 deraadt 324: {
325: (void)fprintf(stderr,
1.13 sobrado 326: "usage: cut -b list [-n] [file ...]\n"
327: " cut -c list [file ...]\n"
328: " cut -f list [-s] [-d delim] [file ...]\n");
1.1 deraadt 329: exit(1);
330: }
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