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1.28 ! guenther 1: /* $OpenBSD: cut.c,v 1.27 2022/12/04 23:50:47 cheloha 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: default:
108: usage();
109: }
110: argc -= optind;
111: argv += optind;
112:
1.23 schwarze 113: if (bflag + cflag + fflag != 1 ||
114: (nflag && !bflag) ||
115: ((dflag || sflag) && !fflag))
1.1 deraadt 116: usage();
117:
1.23 schwarze 118: if (MB_CUR_MAX == 1) {
119: nflag = 0;
120: if (cflag) {
121: bflag = 1;
122: cflag = 0;
123: }
124: }
125:
126: fcn = fflag ? f_cut : (cflag || nflag) ? c_cut : b_cut;
127:
1.18 sobrado 128: rval = 0;
1.1 deraadt 129: if (*argv)
130: for (; *argv; ++argv) {
1.17 sobrado 131: if (strcmp(*argv, "-") == 0)
132: fcn(stdin, "stdin");
133: else {
134: if ((fp = fopen(*argv, "r"))) {
135: fcn(fp, *argv);
136: (void)fclose(fp);
137: } else {
1.18 sobrado 138: rval = 1;
1.17 sobrado 139: warn("%s", *argv);
140: }
141: }
1.1 deraadt 142: }
1.20 deraadt 143: else {
1.26 tobias 144: if (pledge("stdio", NULL) == -1)
1.21 deraadt 145: err(1, "pledge");
1.22 mmcc 146:
1.1 deraadt 147: fcn(stdin, "stdin");
1.20 deraadt 148: }
1.18 sobrado 149: exit(rval);
1.1 deraadt 150: }
151:
152: int autostart, autostop, maxval;
153:
154: char positions[_POSIX2_LINE_MAX + 1];
155:
1.24 tobias 156: int
157: read_number(char **p)
158: {
159: int dash, n;
160: const char *errstr;
161: char *q;
162:
163: q = *p + strcspn(*p, "-");
164: dash = *q == '-';
165: *q = '\0';
166: n = strtonum(*p, 1, _POSIX2_LINE_MAX, &errstr);
167: if (errstr != NULL)
168: errx(1, "[-bcf] list: %s %s (allowed 1-%d)", *p, errstr,
169: _POSIX2_LINE_MAX);
170: if (dash)
171: *q = '-';
172: *p = q;
173:
174: return n;
175: }
176:
1.1 deraadt 177: void
1.11 deraadt 178: get_list(char *list)
1.1 deraadt 179: {
1.8 mpech 180: int setautostart, start, stop;
1.1 deraadt 181: char *p;
182:
183: /*
184: * set a byte in the positions array to indicate if a field or
185: * column is to be selected; use +1, it's 1-based, not 0-based.
186: * This parser is less restrictive than the Draft 9 POSIX spec.
187: * POSIX doesn't allow lists that aren't in increasing order or
188: * overlapping lists. We also handle "-3-5" although there's no
189: * real reason too.
190: */
1.7 aaron 191: while ((p = strsep(&list, ", \t"))) {
1.1 deraadt 192: setautostart = start = stop = 0;
193: if (*p == '-') {
194: ++p;
195: setautostart = 1;
196: }
1.16 deraadt 197: if (isdigit((unsigned char)*p)) {
1.24 tobias 198: start = stop = read_number(&p);
1.1 deraadt 199: if (setautostart && start > autostart)
200: autostart = start;
201: }
202: if (*p == '-') {
1.24 tobias 203: if (isdigit((unsigned char)p[1])) {
204: ++p;
205: stop = read_number(&p);
206: }
1.1 deraadt 207: if (*p == '-') {
208: ++p;
209: if (!autostop || autostop > stop)
210: autostop = stop;
211: }
212: }
1.24 tobias 213: if (*p != '\0' || !stop || !start)
1.15 schwarze 214: errx(1, "[-bcf] list: illegal list value");
1.1 deraadt 215: if (maxval < stop)
216: maxval = stop;
1.24 tobias 217: if (start <= stop)
218: memset(positions + start, 1, stop - start + 1);
1.1 deraadt 219: }
220:
221: /* overlapping ranges */
222: if (autostop && maxval > autostop)
223: maxval = autostop;
224:
225: /* set autostart */
226: if (autostart)
227: memset(positions + 1, '1', autostart);
228: }
229:
230: void
1.23 schwarze 231: b_cut(FILE *fp, char *fname)
1.1 deraadt 232: {
1.8 mpech 233: int ch, col;
234: char *pos;
1.1 deraadt 235:
236: for (;;) {
237: pos = positions + 1;
238: for (col = maxval; col; --col) {
239: if ((ch = getc(fp)) == EOF)
240: return;
241: if (ch == '\n')
242: break;
243: if (*pos++)
244: (void)putchar(ch);
245: }
1.7 aaron 246: if (ch != '\n') {
1.1 deraadt 247: if (autostop)
248: while ((ch = getc(fp)) != EOF && ch != '\n')
249: (void)putchar(ch);
250: else
1.7 aaron 251: while ((ch = getc(fp)) != EOF && ch != '\n')
252: ;
253: }
1.1 deraadt 254: (void)putchar('\n');
255: }
256: }
257:
258: void
1.23 schwarze 259: c_cut(FILE *fp, char *fname)
1.1 deraadt 260: {
1.23 schwarze 261: static char *line = NULL;
262: static size_t linesz = 0;
263: ssize_t linelen;
264: char *cp, *pos, *maxpos;
265: int len;
266:
267: while ((linelen = getline(&line, &linesz, fp)) != -1) {
268: if (line[linelen - 1] == '\n')
269: line[linelen - 1] = '\0';
1.1 deraadt 270:
1.23 schwarze 271: cp = line;
272: pos = positions + 1;
273: maxpos = pos + maxval;
274: while(pos < maxpos && *cp != '\0') {
275: len = mblen(cp, MB_CUR_MAX);
276: if (len == -1)
277: len = 1;
278: pos += nflag ? len : 1;
279: if (pos[-1] == '\0')
280: cp += len;
281: else
282: while (len--)
283: putchar(*cp++);
1.1 deraadt 284: }
1.23 schwarze 285: if (autostop)
286: puts(cp);
287: else
288: putchar('\n');
289: }
290: }
291:
292: void
293: f_cut(FILE *fp, char *fname)
294: {
295: static char *line = NULL;
296: static size_t linesz = 0;
297: ssize_t linelen;
298: char *sp, *ep, *pos, *maxpos;
299: int output;
300:
301: while ((linelen = getline(&line, &linesz, fp)) != -1) {
302: if (line[linelen - 1] == '\n')
303: line[linelen - 1] = '\0';
304:
305: if ((ep = strstr(line, dchar)) == NULL) {
306: if (!sflag)
307: puts(line);
1.1 deraadt 308: continue;
1.23 schwarze 309: }
1.1 deraadt 310:
311: pos = positions + 1;
1.23 schwarze 312: maxpos = pos + maxval;
313: output = 0;
314: sp = line;
315: for (;;) {
316: if (*pos++) {
317: if (output)
318: fputs(dchar, stdout);
319: while (sp < ep)
320: putchar(*sp++);
321: output = 1;
1.1 deraadt 322: } else
1.23 schwarze 323: sp = ep;
324: if (*sp == '\0' || pos == maxpos)
1.1 deraadt 325: break;
1.23 schwarze 326: sp += dlen;
327: if ((ep = strstr(sp, dchar)) == NULL)
328: ep = strchr(sp, '\0');
329: }
330: if (autostop)
331: puts(sp);
332: else
333: putchar('\n');
1.1 deraadt 334: }
335: }
336:
337: void
1.11 deraadt 338: usage(void)
1.1 deraadt 339: {
340: (void)fprintf(stderr,
1.13 sobrado 341: "usage: cut -b list [-n] [file ...]\n"
342: " cut -c list [file ...]\n"
343: " cut -f list [-s] [-d delim] [file ...]\n");
1.1 deraadt 344: exit(1);
345: }