406 lines
9.1 KiB
C
406 lines
9.1 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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static const char sccsid[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95";
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <err.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int bflag;
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int cflag;
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char dchar;
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int dflag;
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int fflag;
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int nflag;
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int sflag;
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void b_n_cut(FILE *, const char *);
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void c_cut(FILE *, const char *);
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void f_cut(FILE *, const char *);
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void get_list(char *);
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int main(int, char **);
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void needpos(size_t);
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static void usage(void);
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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FILE *fp;
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void (*fcn)(FILE *, const char *);
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int ch, rval;
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setlocale(LC_ALL, "");
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fcn = NULL;
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dchar = '\t'; /* default delimiter is \t */
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/*
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* Since we don't support multi-byte characters, the -c and -b
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* options are equivalent.
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*/
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while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
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switch(ch) {
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case 'b':
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fcn = c_cut;
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get_list(optarg);
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bflag = 1;
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break;
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case 'c':
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fcn = c_cut;
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get_list(optarg);
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cflag = 1;
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break;
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case 'd':
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dchar = *optarg;
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dflag = 1;
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break;
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case 'f':
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get_list(optarg);
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fcn = f_cut;
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fflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (fflag) {
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if (bflag || cflag || nflag)
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usage();
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} else if (!(bflag || cflag) || dflag || sflag)
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usage();
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else if (!bflag && nflag)
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usage();
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if (nflag)
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fcn = b_n_cut;
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rval = 0;
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if (*argv)
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for (; *argv; ++argv) {
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if (strcmp(*argv, "-") == 0)
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fcn(stdin, "stdin");
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else {
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if (!(fp = fopen(*argv, "r"))) {
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warn("%s", *argv);
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rval = 1;
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continue;
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}
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fcn(fp, *argv);
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(void)fclose(fp);
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}
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}
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else
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fcn(stdin, "stdin");
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exit(rval);
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}
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size_t autostart, autostop, maxval;
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char *positions;
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void
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get_list(list)
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char *list;
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{
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size_t setautostart, start, stop;
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char *pos;
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char *p;
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/*
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* set a byte in the positions array to indicate if a field or
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* column is to be selected; use +1, it's 1-based, not 0-based.
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* This parser is less restrictive than the Draft 9 POSIX spec.
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* POSIX doesn't allow lists that aren't in increasing order or
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* overlapping lists. We also handle "-3-5" although there's no
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* real reason too.
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*/
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for (; (p = strsep(&list, ", \t")) != NULL;) {
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setautostart = start = stop = 0;
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if (*p == '-') {
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++p;
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setautostart = 1;
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}
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if (isdigit((unsigned char)*p)) {
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start = stop = strtol(p, &p, 10);
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if (setautostart && start > autostart)
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autostart = start;
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}
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if (*p == '-') {
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if (isdigit((unsigned char)p[1]))
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stop = strtol(p + 1, &p, 10);
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if (*p == '-') {
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++p;
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if (!autostop || autostop > stop)
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autostop = stop;
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}
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}
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if (*p)
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errx(1, "[-cf] list: illegal list value");
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if (!stop || !start)
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errx(1, "[-cf] list: values may not include zero");
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if (maxval < stop) {
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maxval = stop;
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needpos(maxval + 1);
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}
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for (pos = positions + start; start++ <= stop; *pos++ = 1);
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}
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/* overlapping ranges */
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if (autostop && maxval > autostop) {
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maxval = autostop;
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needpos(maxval + 1);
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}
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/* set autostart */
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if (autostart)
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memset(positions + 1, '1', autostart);
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}
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void
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needpos(size_t n)
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{
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static size_t npos;
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size_t oldnpos;
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/* Grow the positions array to at least the specified size. */
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if (n > npos) {
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oldnpos = npos;
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if (npos == 0)
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npos = n;
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while (n > npos)
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npos *= 2;
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if ((positions = realloc(positions, npos)) == NULL)
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err(1, "realloc");
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memset((char *)positions + oldnpos, 0, npos - oldnpos);
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}
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}
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/*
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* Cut based on byte positions, taking care not to split multibyte characters.
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* Although this function also handles the case where -n is not specified,
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* c_cut() ought to be much faster.
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*/
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void
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b_n_cut(fp, fname)
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FILE *fp;
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const char *fname;
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{
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size_t col, i, lbuflen;
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char *lbuf;
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int canwrite, clen, warned;
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warned = 0;
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while ((lbuf = fgetln(fp, &lbuflen)) != NULL) {
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for (col = 0; lbuflen > 0; col += clen) {
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if ((clen = mblen(lbuf, lbuflen)) < 0) {
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if (!warned) {
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warn("%s", fname);
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warned = 1;
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}
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clen = 1;
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}
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if (clen == 0 || *lbuf == '\n')
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break;
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if (col < maxval && !positions[1 + col]) {
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/*
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* Print the character if (1) after an initial
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* segment of un-selected bytes, the rest of
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* it is selected, and (2) the last byte is
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* selected.
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*/
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i = col;
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while (i < col + clen && i < maxval &&
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!positions[1 + i])
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i++;
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canwrite = i < col + clen;
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for (; i < col + clen && i < maxval; i++)
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canwrite &= positions[1 + i];
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if (canwrite)
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fwrite(lbuf, 1, clen, stdout);
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} else {
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/*
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* Print the character if all of it has
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* been selected.
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*/
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canwrite = 1;
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for (i = col; i < col + clen; i++)
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if ((i >= maxval && !autostop) ||
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(i < maxval && !positions[1 + i])) {
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canwrite = 0;
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break;
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}
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if (canwrite)
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fwrite(lbuf, 1, clen, stdout);
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}
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lbuf += clen;
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lbuflen -= clen;
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}
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if (lbuflen > 0)
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putchar('\n');
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}
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}
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void
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c_cut(fp, fname)
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FILE *fp;
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const char *fname __unused;
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{
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int ch, col;
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char *pos;
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ch = 0;
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for (;;) {
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pos = positions + 1;
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for (col = maxval; col; --col) {
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if ((ch = getc(fp)) == EOF)
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return;
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if (ch == '\n')
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break;
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if (*pos++)
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(void)putchar(ch);
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}
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if (ch != '\n') {
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if (autostop)
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while ((ch = getc(fp)) != EOF && ch != '\n')
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(void)putchar(ch);
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else
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while ((ch = getc(fp)) != EOF && ch != '\n');
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}
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(void)putchar('\n');
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}
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}
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void
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f_cut(fp, fname)
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FILE *fp;
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const char *fname __unused;
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{
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int ch, field, isdelim;
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char *pos, *p, sep;
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int output;
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char *lbuf, *mlbuf;
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size_t lbuflen;
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mlbuf = NULL;
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for (sep = dchar; (lbuf = fgetln(fp, &lbuflen)) != NULL;) {
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/* Assert EOL has a newline. */
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if (*(lbuf + lbuflen - 1) != '\n') {
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/* Can't have > 1 line with no trailing newline. */
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mlbuf = malloc(lbuflen + 1);
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if (mlbuf == NULL)
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err(1, "malloc");
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memcpy(mlbuf, lbuf, lbuflen);
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*(mlbuf + lbuflen) = '\n';
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lbuf = mlbuf;
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}
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output = 0;
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for (isdelim = 0, p = lbuf;; ++p) {
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ch = *p;
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/* this should work if newline is delimiter */
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if (ch == sep)
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isdelim = 1;
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if (ch == '\n') {
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if (!isdelim && !sflag)
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(void)fwrite(lbuf, lbuflen, 1, stdout);
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break;
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}
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}
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if (!isdelim)
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continue;
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pos = positions + 1;
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for (field = maxval, p = lbuf; field; --field, ++pos) {
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if (*pos) {
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if (output++)
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(void)putchar(sep);
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while ((ch = *p++) != '\n' && ch != sep)
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(void)putchar(ch);
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} else {
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while ((ch = *p++) != '\n' && ch != sep)
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continue;
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}
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if (ch == '\n')
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break;
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}
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if (ch != '\n') {
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if (autostop) {
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if (output)
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(void)putchar(sep);
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for (; (ch = *p) != '\n'; ++p)
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(void)putchar(ch);
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} else
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for (; (ch = *p) != '\n'; ++p);
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}
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(void)putchar('\n');
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}
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if (mlbuf != NULL)
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free(mlbuf);
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "%s\n%s\n%s\n",
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"usage: cut -b list [-n] [file ...]",
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" cut -c list [file ...]",
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" cut -f list [-s] [-d delim] [file ...]");
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exit(1);
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}
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