NetBSD/usr.bin/cut/cut.c

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/* $NetBSD: cut.c,v 1.16 2003/08/07 11:13:32 agc Exp $ */
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/*
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* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95";
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#endif
__RCSID("$NetBSD: cut.c,v 1.16 2003/08/07 11:13:32 agc Exp $");
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#endif /* not lint */
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#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <locale.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
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int cflag;
char dchar;
int dflag;
int fflag;
int sflag;
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void c_cut __P((FILE *, char *));
void f_cut __P((FILE *, char *));
void get_list __P((char *));
int main __P((int, char **));
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void usage __P((void));
int
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main(argc, argv)
int argc;
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char *argv[];
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{
FILE *fp;
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void (*fcn) __P((FILE *, char *));
int ch;
fcn = NULL;
setlocale (LC_ALL, "");
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dchar = '\t'; /* default delimiter is \t */
/* Since we don't support multi-byte characters, the -c and -b
options are equivalent, and the -n option is meaningless. */
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while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
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switch(ch) {
case 'b':
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case 'c':
fcn = c_cut;
get_list(optarg);
cflag = 1;
break;
case 'd':
dchar = *optarg;
dflag = 1;
break;
case 'f':
get_list(optarg);
fcn = f_cut;
fflag = 1;
break;
case 's':
sflag = 1;
break;
case 'n':
break;
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case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (fflag) {
if (cflag)
usage();
} else if (!cflag || dflag || sflag)
usage();
if (*argv)
for (; *argv; ++argv) {
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if (!(fp = fopen(*argv, "r")))
err(1, "%s", *argv);
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fcn(fp, *argv);
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(void)fclose(fp);
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}
else
fcn(stdin, "stdin");
exit(0);
}
int autostart, autostop, maxval;
char positions[_POSIX2_LINE_MAX + 1];
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void
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get_list(list)
char *list;
{
int setautostart, start, stop;
char *pos;
char *p;
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/*
* set a byte in the positions array to indicate if a field or
* column is to be selected; use +1, it's 1-based, not 0-based.
* This parser is less restrictive than the Draft 9 POSIX spec.
* POSIX doesn't allow lists that aren't in increasing order or
* overlapping lists. We also handle "-3-5" although there's no
* real reason too.
*/
for (; (p = strtok(list, ", \t")) != NULL; list = NULL) {
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setautostart = start = stop = 0;
if (*p == '-') {
++p;
setautostart = 1;
}
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if (isdigit((unsigned char)*p)) {
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start = stop = strtol(p, &p, 10);
if (setautostart && start > autostart)
autostart = start;
}
if (*p == '-') {
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if (isdigit((unsigned char)p[1]))
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stop = strtol(p + 1, &p, 10);
if (*p == '-') {
++p;
if (!autostop || autostop > stop)
autostop = stop;
}
}
if (*p)
errx(1, "[-cf] list: illegal list value");
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if (!stop || !start)
errx(1, "[-cf] list: values may not include zero");
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if (stop > _POSIX2_LINE_MAX)
errx(1, "[-cf] list: %d too large (max %d)",
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stop, _POSIX2_LINE_MAX);
if (maxval < stop)
maxval = stop;
for (pos = positions + start; start++ <= stop; *pos++ = 1);
}
/* overlapping ranges */
if (autostop && maxval > autostop)
maxval = autostop;
/* set autostart */
if (autostart)
memset(positions + 1, '1', autostart);
}
/* ARGSUSED */
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void
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c_cut(fp, fname)
FILE *fp;
char *fname;
{
int ch, col;
char *pos;
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ch = 0;
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for (;;) {
pos = positions + 1;
for (col = maxval; col; --col) {
if ((ch = getc(fp)) == EOF)
return;
if (ch == '\n')
break;
if (*pos++)
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(void)putchar(ch);
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}
if (ch != '\n') {
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if (autostop)
while ((ch = getc(fp)) != EOF && ch != '\n')
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(void)putchar(ch);
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else
while ((ch = getc(fp)) != EOF && ch != '\n');
}
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(void)putchar('\n');
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}
}
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void
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f_cut(fp, fname)
FILE *fp;
char *fname;
{
int ch, field, isdelim;
char *pos, *p, sep;
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int output;
char lbuf[_POSIX2_LINE_MAX + 1];
for (sep = dchar; fgets(lbuf, sizeof(lbuf), fp);) {
output = 0;
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for (isdelim = 0, p = lbuf;; ++p) {
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if (!(ch = *p))
errx(1, "%s: line too long.", fname);
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/* this should work if newline is delimiter */
if (ch == sep)
isdelim = 1;
if (ch == '\n') {
if (!isdelim && !sflag)
(void)printf("%s", lbuf);
break;
}
}
if (!isdelim)
continue;
pos = positions + 1;
for (field = maxval, p = lbuf; field; --field, ++pos) {
if (*pos) {
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);
} else {
while ((ch = *p++) != '\n' && ch != sep)
continue;
}
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if (ch == '\n')
break;
}
if (ch != '\n') {
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if (autostop) {
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
for (; (ch = *p) != '\n'; ++p);
}
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(void)putchar('\n');
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}
}
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void
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usage()
{
(void)fprintf(stderr, "usage:\tcut -b list [-n] [file ...]\n"
"\tcut -c list [file1 ...]\n"
"\tcut -f list [-d delim] [-s] [file ...]\n");
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exit(1);
}