377 lines
8.7 KiB
C
377 lines
8.7 KiB
C
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/*
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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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#endif /* not lint */
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#ifndef lint
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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 <config.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <errno.h>
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#include "bashansi.h"
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include "builtins.h"
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#include "shell.h"
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#include "bashgetopt.h"
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#if !defined (errno)
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extern int errno;
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#endif
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#if !defined (_POSIX2_LINE_MAX)
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# define _POSIX2_LINE_MAX 2048
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#endif
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static int cflag;
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static char dchar;
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static int dflag;
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static int fflag;
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static int sflag;
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static int autostart, autostop, maxval;
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static char positions[_POSIX2_LINE_MAX + 1];
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static int c_cut __P((FILE *, char *));
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static int f_cut __P((FILE *, char *));
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static int get_list __P((char *));
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static char *_cut_strsep __P((char **, const char *));
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int
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cut_builtin(list)
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WORD_LIST *list;
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{
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FILE *fp;
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int (*fcn) __P((FILE *, char *)) = NULL;
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int ch;
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fcn = NULL;
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dchar = '\t'; /* default delimiter is \t */
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/* Since we don't support multi-byte characters, the -c and -b
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options are equivalent, and the -n option is meaningless. */
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reset_internal_getopt ();
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while ((ch = internal_getopt (list, "b:c:d:f:sn")) != -1)
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switch(ch) {
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case 'b':
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case 'c':
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fcn = c_cut;
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if (get_list(list_optarg) < 0)
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return (EXECUTION_FAILURE);
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cflag = 1;
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break;
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case 'd':
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dchar = *list_optarg;
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dflag = 1;
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break;
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case 'f':
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fcn = f_cut;
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if (get_list(list_optarg) < 0)
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return (EXECUTION_FAILURE);
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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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break;
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case '?':
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default:
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builtin_usage();
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return (EX_USAGE);
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}
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list = loptend;
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if (fflag) {
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if (cflag) {
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builtin_usage();
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return (EX_USAGE);
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}
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} else if (!cflag || dflag || sflag) {
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builtin_usage();
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return (EX_USAGE);
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}
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if (list) {
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while (list) {
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fp = fopen(list->word->word, "r");
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if (fp == 0) {
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builtin_error("%s", list->word->word);
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return (EXECUTION_FAILURE);
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}
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ch = (*fcn)(fp, list->word->word);
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(void)fclose(fp);
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if (ch < 0)
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return (EXECUTION_FAILURE);
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list = list->next;
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}
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} else {
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ch = (*fcn)(stdin, "stdin");
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if (ch < 0)
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return (EXECUTION_FAILURE);
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}
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return (EXECUTION_SUCCESS);
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}
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static int
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get_list(list)
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char *list;
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{
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int 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 = _cut_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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builtin_error("[-cf] list: illegal list value");
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return -1;
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}
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if (!stop || !start) {
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builtin_error("[-cf] list: values may not include zero");
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return -1;
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}
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if (stop > _POSIX2_LINE_MAX) {
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builtin_error("[-cf] list: %d too large (max %d)",
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stop, _POSIX2_LINE_MAX);
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return -1;
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}
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if (maxval < stop)
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maxval = stop;
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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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/* set autostart */
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if (autostart)
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memset(positions + 1, '1', autostart);
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return 0;
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}
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/* ARGSUSED */
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static int
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c_cut(fp, fname)
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FILE *fp;
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char *fname;
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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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return (0);
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}
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static int
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f_cut(fp, fname)
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FILE *fp;
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char *fname;
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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[_POSIX2_LINE_MAX + 1];
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for (sep = dchar; fgets(lbuf, sizeof(lbuf), fp);) {
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output = 0;
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for (isdelim = 0, p = lbuf;; ++p) {
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if (!(ch = *p)) {
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builtin_error("%s: line too long.", fname);
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return -1;
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}
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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)printf("%s", lbuf);
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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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return (0);
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}
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/*
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* Get next token from string *stringp, where tokens are possibly-empty
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* strings separated by characters from delim.
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*
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* Writes NULs into the string at *stringp to end tokens.
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* delim need not remain constant from call to call.
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* On return, *stringp points past the last NUL written (if there might
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* be further tokens), or is NULL (if there are definitely no more tokens).
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*
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* If *stringp is NULL, strsep returns NULL.
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*/
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static char *
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_cut_strsep(stringp, delim)
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register char **stringp;
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register const char *delim;
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{
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register char *s;
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register const char *spanp;
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register int c, sc;
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char *tok;
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if ((s = *stringp) == NULL)
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return (NULL);
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for (tok = s;;) {
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c = *s++;
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spanp = delim;
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do {
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if ((sc = *spanp++) == c) {
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if (c == 0)
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s = NULL;
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else
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s[-1] = 0;
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*stringp = s;
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return (tok);
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}
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} while (sc != 0);
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}
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/* NOTREACHED */
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}
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static char *cut_doc[] = {
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"Select portions of each line (as specified by LIST) from each FILE",
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"(by default, the standard input), and write them to the standard output.",
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"Items specified by LIST are either column positions or fields delimited",
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"by a special character. Column numbering starts at 1.",
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(char *)0
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};
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struct builtin cut_struct = {
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"cut",
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cut_builtin,
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BUILTIN_ENABLED,
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cut_doc,
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"cut -b list [-n] [file ...] OR cut -c list [file ...] OR cut -f list [-s] [-d delim] [file ...]",
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0
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};
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