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1.19 ! deraadt 1: /* $OpenBSD: cut.c,v 1.18 2014/02/02 11:44:01 sobrado 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:
36: #include <ctype.h>
37: #include <err.h>
38: #include <errno.h>
39: #include <limits.h>
40: #include <locale.h>
41: #include <stdio.h>
42: #include <stdlib.h>
43: #include <string.h>
44: #include <unistd.h>
45:
46: int cflag;
47: char dchar;
48: int dflag;
49: int fflag;
50: int sflag;
51:
1.9 millert 52: void c_cut(FILE *, char *);
53: void f_cut(FILE *, char *);
54: void get_list(char *);
55: void usage(void);
1.1 deraadt 56:
57: int
1.11 deraadt 58: main(int argc, char *argv[])
1.1 deraadt 59: {
60: FILE *fp;
1.9 millert 61: void (*fcn)(FILE *, char *);
1.18 sobrado 62: int ch, rval;
1.1 deraadt 63:
64: setlocale (LC_ALL, "");
65:
66: dchar = '\t'; /* default delimiter is \t */
67:
68: /* Since we don't support multi-byte characters, the -c and -b
69: options are equivalent, and the -n option is meaningless. */
1.3 millert 70: while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
1.1 deraadt 71: switch(ch) {
72: case 'b':
73: case 'c':
74: fcn = c_cut;
75: get_list(optarg);
76: cflag = 1;
77: break;
78: case 'd':
79: dchar = *optarg;
80: dflag = 1;
81: break;
82: case 'f':
83: get_list(optarg);
84: fcn = f_cut;
85: fflag = 1;
86: break;
87: case 's':
88: sflag = 1;
89: break;
90: case 'n':
91: break;
92: case '?':
93: default:
94: usage();
95: }
96: argc -= optind;
97: argv += optind;
98:
99: if (fflag) {
100: if (cflag)
101: usage();
102: } else if (!cflag || dflag || sflag)
103: usage();
104:
1.18 sobrado 105: rval = 0;
1.1 deraadt 106: if (*argv)
107: for (; *argv; ++argv) {
1.17 sobrado 108: if (strcmp(*argv, "-") == 0)
109: fcn(stdin, "stdin");
110: else {
111: if ((fp = fopen(*argv, "r"))) {
112: fcn(fp, *argv);
113: (void)fclose(fp);
114: } else {
1.18 sobrado 115: rval = 1;
1.17 sobrado 116: warn("%s", *argv);
117: }
118: }
1.1 deraadt 119: }
120: else
121: fcn(stdin, "stdin");
1.18 sobrado 122: exit(rval);
1.1 deraadt 123: }
124:
125: int autostart, autostop, maxval;
126:
127: char positions[_POSIX2_LINE_MAX + 1];
128:
129: void
1.11 deraadt 130: get_list(char *list)
1.1 deraadt 131: {
1.8 mpech 132: int setautostart, start, stop;
133: char *pos;
1.1 deraadt 134: char *p;
135:
136: /*
137: * set a byte in the positions array to indicate if a field or
138: * column is to be selected; use +1, it's 1-based, not 0-based.
139: * This parser is less restrictive than the Draft 9 POSIX spec.
140: * POSIX doesn't allow lists that aren't in increasing order or
141: * overlapping lists. We also handle "-3-5" although there's no
142: * real reason too.
143: */
1.7 aaron 144: while ((p = strsep(&list, ", \t"))) {
1.1 deraadt 145: setautostart = start = stop = 0;
146: if (*p == '-') {
147: ++p;
148: setautostart = 1;
149: }
1.16 deraadt 150: if (isdigit((unsigned char)*p)) {
1.1 deraadt 151: start = stop = strtol(p, &p, 10);
152: if (setautostart && start > autostart)
153: autostart = start;
154: }
155: if (*p == '-') {
1.16 deraadt 156: if (isdigit((unsigned char)p[1]))
1.1 deraadt 157: stop = strtol(p + 1, &p, 10);
158: if (*p == '-') {
159: ++p;
160: if (!autostop || autostop > stop)
161: autostop = stop;
162: }
163: }
164: if (*p)
1.15 schwarze 165: errx(1, "[-bcf] list: illegal list value");
1.1 deraadt 166: if (!stop || !start)
1.15 schwarze 167: errx(1, "[-bcf] list: values may not include zero");
1.1 deraadt 168: if (stop > _POSIX2_LINE_MAX)
1.15 schwarze 169: errx(1, "[-bcf] list: %d too large (max %d)",
1.1 deraadt 170: stop, _POSIX2_LINE_MAX);
171: if (maxval < stop)
172: maxval = stop;
1.7 aaron 173: for (pos = positions + start; start++ <= stop; *pos++ = 1)
174: ;
1.1 deraadt 175: }
176:
177: /* overlapping ranges */
178: if (autostop && maxval > autostop)
179: maxval = autostop;
180:
181: /* set autostart */
182: if (autostart)
183: memset(positions + 1, '1', autostart);
184: }
185:
186: /* ARGSUSED */
187: void
1.11 deraadt 188: c_cut(FILE *fp, char *fname)
1.1 deraadt 189: {
1.8 mpech 190: int ch, col;
191: char *pos;
1.1 deraadt 192:
193: for (;;) {
194: pos = positions + 1;
195: for (col = maxval; col; --col) {
196: if ((ch = getc(fp)) == EOF)
197: return;
198: if (ch == '\n')
199: break;
200: if (*pos++)
201: (void)putchar(ch);
202: }
1.7 aaron 203: if (ch != '\n') {
1.1 deraadt 204: if (autostop)
205: while ((ch = getc(fp)) != EOF && ch != '\n')
206: (void)putchar(ch);
207: else
1.7 aaron 208: while ((ch = getc(fp)) != EOF && ch != '\n')
209: ;
210: }
1.1 deraadt 211: (void)putchar('\n');
212: }
213: }
214:
215: void
1.11 deraadt 216: f_cut(FILE *fp, char *fname)
1.1 deraadt 217: {
1.8 mpech 218: int ch, field, isdelim;
219: char *pos, *p, sep;
1.1 deraadt 220: int output;
1.7 aaron 221: size_t len;
222: char *lbuf, *tbuf;
1.1 deraadt 223:
1.7 aaron 224: for (sep = dchar, tbuf = NULL; (lbuf = fgetln(fp, &len));) {
1.1 deraadt 225: output = 0;
1.7 aaron 226: if (lbuf[len - 1] != '\n') {
227: /* no newline at the end of the last line so add one */
1.19 ! deraadt 228: if ((tbuf = malloc(len + 1)) == NULL)
1.7 aaron 229: err(1, NULL);
230: memcpy(tbuf, lbuf, len);
231: tbuf[len] = '\n';
232: lbuf = tbuf;
233: }
1.1 deraadt 234: for (isdelim = 0, p = lbuf;; ++p) {
1.7 aaron 235: ch = *p;
1.1 deraadt 236: /* this should work if newline is delimiter */
237: if (ch == sep)
238: isdelim = 1;
239: if (ch == '\n') {
240: if (!isdelim && !sflag)
1.7 aaron 241: (void)fwrite(lbuf, len, 1, stdout);
1.1 deraadt 242: break;
243: }
244: }
245: if (!isdelim)
246: continue;
247:
248: pos = positions + 1;
249: for (field = maxval, p = lbuf; field; --field, ++pos) {
250: if (*pos) {
251: if (output++)
252: (void)putchar(sep);
253: while ((ch = *p++) != '\n' && ch != sep)
254: (void)putchar(ch);
255: } else
1.7 aaron 256: while ((ch = *p++) != '\n' && ch != sep)
257: ;
1.1 deraadt 258: if (ch == '\n')
259: break;
260: }
1.7 aaron 261: if (ch != '\n') {
1.1 deraadt 262: if (autostop) {
263: if (output)
264: (void)putchar(sep);
265: for (; (ch = *p) != '\n'; ++p)
266: (void)putchar(ch);
267: } else
1.7 aaron 268: for (; (ch = *p) != '\n'; ++p)
269: ;
270: }
1.1 deraadt 271: (void)putchar('\n');
272: }
1.7 aaron 273: if (tbuf)
274: free(tbuf);
1.1 deraadt 275: }
276:
277: void
1.11 deraadt 278: usage(void)
1.1 deraadt 279: {
280: (void)fprintf(stderr,
1.13 sobrado 281: "usage: cut -b list [-n] [file ...]\n"
282: " cut -c list [file ...]\n"
283: " cut -f list [-s] [-d delim] [file ...]\n");
1.1 deraadt 284: exit(1);
285: }