Annotation of src/usr.bin/cut/cut.c, Revision 1.25
1.25 ! krw 1: /* $OpenBSD: cut.c,v 1.24 2018/03/30 09:25:06 tobias 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:
1.24 tobias 157: int
158: read_number(char **p)
159: {
160: int dash, n;
161: const char *errstr;
162: char *q;
163:
164: q = *p + strcspn(*p, "-");
165: dash = *q == '-';
166: *q = '\0';
167: n = strtonum(*p, 1, _POSIX2_LINE_MAX, &errstr);
168: if (errstr != NULL)
169: errx(1, "[-bcf] list: %s %s (allowed 1-%d)", *p, errstr,
170: _POSIX2_LINE_MAX);
171: if (dash)
172: *q = '-';
173: *p = q;
174:
175: return n;
176: }
177:
1.1 deraadt 178: void
1.11 deraadt 179: get_list(char *list)
1.1 deraadt 180: {
1.8 mpech 181: int setautostart, start, stop;
1.1 deraadt 182: char *p;
183:
184: /*
185: * set a byte in the positions array to indicate if a field or
186: * column is to be selected; use +1, it's 1-based, not 0-based.
187: * This parser is less restrictive than the Draft 9 POSIX spec.
188: * POSIX doesn't allow lists that aren't in increasing order or
189: * overlapping lists. We also handle "-3-5" although there's no
190: * real reason too.
191: */
1.7 aaron 192: while ((p = strsep(&list, ", \t"))) {
1.1 deraadt 193: setautostart = start = stop = 0;
194: if (*p == '-') {
195: ++p;
196: setautostart = 1;
197: }
1.16 deraadt 198: if (isdigit((unsigned char)*p)) {
1.24 tobias 199: start = stop = read_number(&p);
1.1 deraadt 200: if (setautostart && start > autostart)
201: autostart = start;
202: }
203: if (*p == '-') {
1.24 tobias 204: if (isdigit((unsigned char)p[1])) {
205: ++p;
206: stop = read_number(&p);
207: }
1.1 deraadt 208: if (*p == '-') {
209: ++p;
210: if (!autostop || autostop > stop)
211: autostop = stop;
212: }
213: }
1.24 tobias 214: if (*p != '\0' || !stop || !start)
1.15 schwarze 215: errx(1, "[-bcf] list: illegal list value");
1.1 deraadt 216: if (maxval < stop)
217: maxval = stop;
1.24 tobias 218: if (start <= stop)
219: memset(positions + start, 1, stop - start + 1);
1.1 deraadt 220: }
221:
222: /* overlapping ranges */
223: if (autostop && maxval > autostop)
224: maxval = autostop;
225:
226: /* set autostart */
227: if (autostart)
228: memset(positions + 1, '1', autostart);
229: }
230:
231: /* ARGSUSED */
232: void
1.23 schwarze 233: b_cut(FILE *fp, char *fname)
1.1 deraadt 234: {
1.8 mpech 235: int ch, col;
236: char *pos;
1.1 deraadt 237:
238: for (;;) {
239: pos = positions + 1;
240: for (col = maxval; col; --col) {
241: if ((ch = getc(fp)) == EOF)
242: return;
243: if (ch == '\n')
244: break;
245: if (*pos++)
246: (void)putchar(ch);
247: }
1.7 aaron 248: if (ch != '\n') {
1.1 deraadt 249: if (autostop)
250: while ((ch = getc(fp)) != EOF && ch != '\n')
251: (void)putchar(ch);
252: else
1.7 aaron 253: while ((ch = getc(fp)) != EOF && ch != '\n')
254: ;
255: }
1.1 deraadt 256: (void)putchar('\n');
257: }
258: }
259:
260: void
1.23 schwarze 261: c_cut(FILE *fp, char *fname)
1.1 deraadt 262: {
1.23 schwarze 263: static char *line = NULL;
264: static size_t linesz = 0;
265: ssize_t linelen;
266: char *cp, *pos, *maxpos;
267: int len;
268:
269: while ((linelen = getline(&line, &linesz, fp)) != -1) {
270: if (line[linelen - 1] == '\n')
271: line[linelen - 1] = '\0';
1.1 deraadt 272:
1.23 schwarze 273: cp = line;
274: pos = positions + 1;
275: maxpos = pos + maxval;
276: while(pos < maxpos && *cp != '\0') {
277: len = mblen(cp, MB_CUR_MAX);
278: if (len == -1)
279: len = 1;
280: pos += nflag ? len : 1;
281: if (pos[-1] == '\0')
282: cp += len;
283: else
284: while (len--)
285: putchar(*cp++);
1.1 deraadt 286: }
1.23 schwarze 287: if (autostop)
288: puts(cp);
289: else
290: putchar('\n');
291: }
292: }
293:
294: void
295: f_cut(FILE *fp, char *fname)
296: {
297: static char *line = NULL;
298: static size_t linesz = 0;
299: ssize_t linelen;
300: char *sp, *ep, *pos, *maxpos;
301: int output;
302:
303: while ((linelen = getline(&line, &linesz, fp)) != -1) {
304: if (line[linelen - 1] == '\n')
305: line[linelen - 1] = '\0';
306:
307: if ((ep = strstr(line, dchar)) == NULL) {
308: if (!sflag)
309: puts(line);
1.1 deraadt 310: continue;
1.23 schwarze 311: }
1.1 deraadt 312:
313: pos = positions + 1;
1.23 schwarze 314: maxpos = pos + maxval;
315: output = 0;
316: sp = line;
317: for (;;) {
318: if (*pos++) {
319: if (output)
320: fputs(dchar, stdout);
321: while (sp < ep)
322: putchar(*sp++);
323: output = 1;
1.1 deraadt 324: } else
1.23 schwarze 325: sp = ep;
326: if (*sp == '\0' || pos == maxpos)
1.1 deraadt 327: break;
1.23 schwarze 328: sp += dlen;
329: if ((ep = strstr(sp, dchar)) == NULL)
330: ep = strchr(sp, '\0');
331: }
332: if (autostop)
333: puts(sp);
334: else
335: putchar('\n');
1.1 deraadt 336: }
337: }
338:
339: void
1.11 deraadt 340: usage(void)
1.1 deraadt 341: {
342: (void)fprintf(stderr,
1.13 sobrado 343: "usage: cut -b list [-n] [file ...]\n"
344: " cut -c list [file ...]\n"
345: " cut -f list [-s] [-d delim] [file ...]\n");
1.1 deraadt 346: exit(1);
347: }