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/* $OpenBSD: cut.c,v 1.11 2003/06/10 22:20:45 deraadt Exp $ */
/* $NetBSD: cut.c,v 1.9 1995/09/02 05:59:23 jtc Exp $ */

/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* 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
* 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.
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95";
#endif
static char rcsid[] = "$OpenBSD: cut.c,v 1.11 2003/06/10 22:20:45 deraadt Exp $";
#endif /* not lint */

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int cflag;
char dchar;
int dflag;
int fflag;
int sflag;

void c_cut(FILE *, char *);
void f_cut(FILE *, char *);
void get_list(char *);
void usage(void);

int
main(int argc, char *argv[])
{
FILE *fp;
void (*fcn)(FILE *, char *);
int ch;

setlocale (LC_ALL, "");

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. */
// while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
while (--argc > 0 && (++argv)[0][0] == '-')
switch(argv[0][1]) {
case 'b':
case 'c':
fcn = c_cut;
get_list(&(argv[0][2]));
cflag = 1;
break;
case 'd':
dchar = argv[0][2];
dflag = 1;
break;
case 'f':
get_list(&(argv[0][2]));
fcn = f_cut;
fflag = 1;
break;
case 's':
sflag = 1;
break;
case 'n':
break;
case '?':
default:
usage();
}

if (fflag) {
if (cflag)
usage();
} else if (!cflag || dflag || sflag)
usage();

if (*argv)
for (; *argv; ++argv) {
if (!(fp = fopen(*argv, "r")))
err(1, "%s", *argv);
fcn(fp, *argv);
(void)fclose(fp);
}
else
fcn(stdin, "stdin");
exit(0);
}

int autostart, autostop, maxval;

#define _POSIX2_LINE_MAX 512
char positions[_POSIX2_LINE_MAX + 1];

void
get_list(char *list)
{
int setautostart, start, stop;
char *pos;
char *p;

/*
* 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.
*/
while ((p = strsep(&list, ", \t"))) {
setautostart = start = stop = 0;
if (*p == '-') {
++p;
setautostart = 1;
}
if (isdigit(*p)) {
start = stop = strtol(p, &p, 10);
if (setautostart && start > autostart)
autostart = start;
}
if (*p == '-') {
if (isdigit(p[1]))
stop = strtol(p + 1, &p, 10);
if (*p == '-') {
++p;
if (!autostop || autostop > stop)
autostop = stop;
}
}
if (*p)
errx(1, "[-cf] list: illegal list value");
if (!stop || !start)
errx(1, "[-cf] list: values may not include zero");
if (stop > _POSIX2_LINE_MAX)
errx(1, "[-cf] list: %d too large (max %d)",
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 */
void
c_cut(FILE *fp, char *fname)
{
int ch, col;
char *pos;

for (;;) {
pos = positions + 1;
for (col = maxval; col; --col) {
if ((ch = getc(fp)) == EOF)
return;
if (ch == '\n')
break;
if (*pos++)
(void)putchar(ch);
}
if (ch != '\n') {
if (autostop)
while ((ch = getc(fp)) != EOF && ch != '\n')
(void)putchar(ch);
else
while ((ch = getc(fp)) != EOF && ch != '\n')
;
}
(void)putchar('\n');
}
}

void
f_cut(FILE *fp, char *fname)
{
int ch, field, isdelim;
char *pos, *p, sep;
int output;
size_t len;
char *lbuf, *tbuf;

for (sep = dchar, tbuf = NULL; (lbuf = fgetln(fp, &len));) {
output = 0;
if (lbuf[len - 1] != '\n') {
/* no newline at the end of the last line so add one */
if ((tbuf = (char *)malloc(len + 1)) == NULL)
err(1, NULL);
memcpy(tbuf, lbuf, len);
tbuf[len] = '\n';
lbuf = tbuf;
}
for (isdelim = 0, p = lbuf;; ++p) {
ch = *p;
/* this should work if newline is delimiter */
if (ch == sep)
isdelim = 1;
if (ch == '\n') {
if (!isdelim && !sflag)
(void)fwrite(lbuf, len, 1, stdout);
break;
}
}
if (!isdelim)
continue;

pos = positions + 1;
for (field = maxval, p = lbuf; field; --field, ++pos) {
if (*pos) {
if (output++)
(void)putchar(sep);
while ((ch = *p++) != '\n' && ch != sep)
(void)putchar(ch);
} else
while ((ch = *p++) != '\n' && ch != sep)
;
if (ch == '\n')
break;
}
if (ch != '\n') {
if (autostop) {
if (output)
(void)putchar(sep);
for (; (ch = *p) != '\n'; ++p)
(void)putchar(ch);
} else
for (; (ch = *p) != '\n'; ++p)
;
}
(void)putchar('\n');
}
if (tbuf)
free(tbuf);
}

void
usage(void)
{
(void)fprintf(stderr,
"usage:\tcut -c list [file1 ...]\n"
"\tcut -f list [-s] [-d delim] [file ...]\n"
"\tcut -b list [-n] [file ...]\n");
exit(1);
}

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