[dragonfly.git] / usr.bin / cut / cut.c

/*
 * 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.
 * 4. 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.
 *
 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)cut.c	8.3 (Berkeley) 5/4/95
 * $FreeBSD: src/usr.bin/cut/cut.c,v 1.9.2.3 2001/07/30 09:59:16 dd Exp $
 */

#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>
#include <wchar.h>

static int	bflag;
static int	cflag;
static wchar_t	dchar;
static char	dcharmb[MB_LEN_MAX + 1];
static int	dflag;
static int	fflag;
static int	nflag;
static int	sflag;

static size_t	autostart, autostop, maxval;
static char *	positions;

static int	b_cut(FILE *, const char *);
static int	b_n_cut(FILE *, const char *);
static int	c_cut(FILE *, const char *);
static int	f_cut(FILE *, const char *);
static void	get_list(char *);
static void	needpos(size_t);
static void	usage(void);

int
main(int argc, char *argv[])
{
	FILE *fp;
	int (*fcn)(FILE *, const char *);
	int ch, rval;
	size_t n;

	setlocale (LC_ALL, "");

	fcn = NULL;
	dchar = '\t';			/* default delimiter is \t */
	strcpy(dcharmb, "\t");

	while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
		switch(ch) {
		case 'b':
			get_list(optarg);
			bflag = 1;
			break;
		case 'c':
			get_list(optarg);
			cflag = 1;
			break;
		case 'd':
			n = mbrtowc(&dchar, optarg, MB_LEN_MAX, NULL);
			if (dchar == '\0' || n != strlen(optarg))
				errx(1, "bad delimiter");
			strcpy(dcharmb, optarg);
			dflag = 1;
			break;
		case 'f':
			get_list(optarg);
			fflag = 1;
			break;
		case 's':
			sflag = 1;
			break;
		case 'n':
			nflag = 1;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

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

	if (fflag)
		fcn = f_cut;
	else if (cflag)
		fcn = MB_CUR_MAX > 1 ? c_cut : b_cut;
	else if (bflag)
		fcn = nflag && MB_CUR_MAX > 1 ? b_n_cut : b_cut;

	rval = 0;
	if (*argv)
		for (; *argv; ++argv) {
			if (strcmp(*argv, "-") == 0)
				rval |= fcn(stdin, "stdin");
			else {
				if (!(fp = fopen(*argv, "r"))) {
					warn("%s", *argv);
					rval = 1;
					continue;
				}
			fcn(fp, *argv);
			(void)fclose(fp);
		}
		}
	else
		rval = fcn(stdin, "stdin");
	exit(rval);
}

static void
get_list(char *list)
{
	size_t 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.
	 * Numbers and number ranges may be overlapping, repeated, and in
	 * any order. We handle "-3-5" although there's no real reason to.
	 */
	for (; (p = strsep(&list, ", \t")) != NULL;) {
		setautostart = start = stop = 0;
		if (*p == '-') {
			++p;
			setautostart = 1;
		}
		if (isdigit((unsigned char)*p)) {
			start = stop = strtol(p, &p, 10);
			if (setautostart && start > autostart)
				autostart = start;
		}
		if (*p == '-') {
			if (isdigit((unsigned char)p[1]))
				stop = strtol(p + 1, &p, 10);
			if (*p == '-') {
				++p;
				if (!autostop || autostop > stop)
					autostop = stop;
			}
		}
		if (*p)
			errx(1, "[-bcf] list: illegal list value");
		if (!stop || !start)
			errx(1, "[-bcf] list: values may not include zero");
		if (maxval < stop) {
			maxval = stop;
			needpos(maxval + 1);
		}
		for (pos = positions + start; start++ <= stop; *pos++ = 1);
	}

	/* overlapping ranges */
	if (autostop && maxval > autostop) {
		maxval = autostop;
		needpos(maxval + 1);
	}

	/* set autostart */
	if (autostart)
		memset(positions + 1, '1', autostart);
}

static void
needpos(size_t n)
{
	static size_t npos;
	size_t oldnpos;

	/* Grow the positions array to at least the specified size. */
	if (n > npos) {
		oldnpos = npos;
		if (npos == 0)
			npos = n;
		while (n > npos)
			npos *= 2;
		if ((positions = realloc(positions, npos)) == NULL)
			err(1, "realloc");
		memset((char *)positions + oldnpos, 0, npos - oldnpos);
	}
}

static int
b_cut(FILE *fp, const char *fname __unused)
{
	int ch, col;
	char *pos;

	ch = 0;
	for (;;) {
		pos = positions + 1;
		for (col = maxval; col; --col) {
			if ((ch = getc(fp)) == EOF)
				return (0);
			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');
	}
	return (0);
}

/*
 * Cut based on byte positions, taking care not to split multibyte characters.
 * Although this function also handles the case where -n is not specified,
 * b_cut() ought to be much faster.
 */
static int
b_n_cut(FILE *fp, const char *fname)
{
	size_t col, i, lbuflen;
	char *lbuf;
	int canwrite, clen, warned;
	mbstate_t mbs;

	memset(&mbs, 0, sizeof(mbs));
	warned = 0;
	while ((lbuf = fgetln(fp, &lbuflen)) != NULL) {
		for (col = 0; lbuflen > 0; col += clen) {
			if ((clen = mbrlen(lbuf, lbuflen, &mbs)) < 0) {
				if (!warned) {
					warn("%s", fname);
					warned = 1;
				}
				memset(&mbs, 0, sizeof(mbs));
				clen = 1;
			}
			if (clen == 0 || *lbuf == '\n')
				break;
			if (col < maxval && !positions[1 + col]) {
				/*
				 * Print the character if (1) after an initial
				 * segment of un-selected bytes, the rest of
				 * it is selected, and (2) the last byte is
				 * selected.
				 */
				i = col;
				while (i < col + clen && i < maxval &&
				    !positions[1 + i])
					i++;
				canwrite = i < col + clen;
				for (; i < col + clen && i < maxval; i++)
					canwrite &= positions[1 + i];
				if (canwrite)
					fwrite(lbuf, 1, clen, stdout);
	} else {
				/*
				 * Print the character if all of it has
				 * been selected.
				 */
				canwrite = 1;
				for (i = col; i < col + clen; i++)
					if ((i >= maxval && !autostop) ||
					    (i < maxval && !positions[1 + i])) {
						canwrite = 0;
						break;
					}
				if (canwrite)
					fwrite(lbuf, 1, clen, stdout);
			}
			lbuf += clen;
			lbuflen -= clen;
		}
		if (lbuflen > 0)
			putchar('\n');
	}
	return (warned);
}

static int
c_cut(FILE *fp, const char *fname)
{
	wint_t ch;
	int col;
	char *pos;

	ch = 0;
	for (;;) {
		pos = positions + 1;
		for (col = maxval; col; --col) {
			if ((ch = getwc(fp)) == WEOF)
				goto out;
			if (ch == '\n')
				break;
			if (*pos++)
				(void)putwchar(ch);
	}
		if (ch != '\n') {
			if (autostop)
				while ((ch = getwc(fp)) != WEOF && ch != '\n')
					(void)putwchar(ch);
			else
				while ((ch = getwc(fp)) != WEOF && ch != '\n');
		}
		(void)putwchar('\n');
	}
out:
	if (ferror(fp)) {
		warn("%s", fname);
		return (1);
	}
	return (0);
}

static int
f_cut(FILE *fp, const char *fname)
{
	wchar_t ch;
	int field, i, isdelim;
	char *pos, *p;
	wchar_t sep;
	int output;
	char *lbuf, *mlbuf;
	size_t clen, lbuflen, reallen;

	mlbuf = NULL;
	for (sep = dchar; (lbuf = fgetln(fp, &lbuflen)) != NULL;) {
		reallen = lbuflen;
		/* Assert EOL has a newline. */
		if (*(lbuf + lbuflen - 1) != '\n') {
			/* Can't have > 1 line with no trailing newline. */
			mlbuf = malloc(lbuflen + 1);
			if (mlbuf == NULL)
				err(1, "malloc");
			memcpy(mlbuf, lbuf, lbuflen);
			*(mlbuf + lbuflen) = '\n';
			lbuf = mlbuf;
			reallen++;
		}
		output = 0;
		for (isdelim = 0, p = lbuf;; p += clen) {
			clen = mbrtowc(&ch, p, lbuf + reallen - p, NULL);
			if (clen == (size_t)-1 || clen == (size_t)-2) {
				warnc(EILSEQ, "%s", fname);
				free(mlbuf);
				return (1);
			}
			if (clen == 0)
				clen = 1;
			/* this should work if newline is delimiter */
			if (ch == sep)
				isdelim = 1;
			if (ch == '\n') {
				if (!isdelim && !sflag)
					(void)fwrite(lbuf, lbuflen, 1, stdout);
				break;
			}
		}
		if (!isdelim)
			continue;

		pos = positions + 1;
		for (field = maxval, p = lbuf; field; --field, ++pos) {
			if (*pos && output++)
				for (i = 0; dcharmb[i] != '\0'; i++)
					putchar(dcharmb[i]);
			for (;;) {
				clen = mbrtowc(&ch, p, lbuf + reallen - p,
				    NULL);
				if (clen == (size_t)-1 || clen == (size_t)-2) {
					warnc(EILSEQ, "%s", fname);
					free(mlbuf);
					return (1);
				}
				if (clen == 0)
					clen = 1;
				p += clen;
				if (ch == '\n' || ch == sep)
					break;
				if (*pos)
					for (i = 0; i < (int)clen; i++)
						putchar(p[i - clen]);
			}
			if (ch == '\n')
				break;
		}
		if (ch != '\n') {
			if (autostop) {
				if (output)
					for (i = 0; dcharmb[i] != '\0'; i++)
						putchar(dcharmb[i]);
				for (; (ch = *p) != '\n'; ++p)
					(void)putchar(ch);
			} else
				for (; (ch = *p) != '\n'; ++p);
		}
		(void)putchar('\n');
	}
		free(mlbuf);
	return (0);
}

static void
usage(void)
{
	(void)fprintf(stderr, "%s\n%s\n%s\n",
		"usage: cut -b list [-n] [file ...]",
		"       cut -c list [file ...]",
		"       cut -f list [-s] [-d delim] [file ...]");
	exit(1);
}
Commit	Line	Data
984263bc MD	1	/*
	2	* Copyright (c) 1989, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
984263bc MD	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
1de703da MD	31	*
	32	* @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved.
	33	* @(#)cut.c 8.3 (Berkeley) 5/4/95
	34	* $FreeBSD: src/usr.bin/cut/cut.c,v 1.9.2.3 2001/07/30 09:59:16 dd Exp $
984263bc MD	35	*/
984263bc MD	36
984263bc MD	37	#include <ctype.h>
984263bc MD	38	#include <err.h>
fecfcc56	39	#include <errno.h>
984263bc MD	40	#include <limits.h>
	41	#include <locale.h>
	42	#include <stdio.h>
	43	#include <stdlib.h>
	44	#include <string.h>
	45	#include <unistd.h>
fecfcc56	46	#include <wchar.h>
984263bc	47
fecfcc56 JM	48	static int bflag;
	49	static int cflag;
	50	static wchar_t dchar;
	51	static char dcharmb[MB_LEN_MAX + 1];
	52	static int dflag;
	53	static int fflag;
	54	static int nflag;
	55	static int sflag;
984263bc	56
fecfcc56 JM	57	static size_t autostart, autostop, maxval;
	58	static char * positions;
	59
	60	static int b_cut(FILE , const char );
	61	static int b_n_cut(FILE , const char );
	62	static int c_cut(FILE , const char );
	63	static int f_cut(FILE , const char );
0d104663	64	static void get_list(char *);
fecfcc56	65	static void needpos(size_t);
0d104663	66	static void usage(void);
984263bc MD	67
984263bc MD	68	int
fecfcc56	69	main(int argc, char *argv[])
984263bc MD	70	{
984263bc MD	71	FILE *fp;
fecfcc56 JM	72	int (fcn)(FILE , const char *);
	73	int ch, rval;
	74	size_t n;
984263bc	75
984263bc MD	76	setlocale (LC_ALL, "");
984263bc MD	77
fecfcc56	78	fcn = NULL;
984263bc	79	dchar = '\t'; /* default delimiter is \t */
fecfcc56	80	strcpy(dcharmb, "\t");
984263bc	81
fecfcc56	82	while ((ch = getopt(argc, argv, "b:c:d:f:sn")) != -1)
984263bc MD	83	switch(ch) {
984263bc MD	84	case 'b':
fecfcc56 JM	85	get_list(optarg);
	86	bflag = 1;
	87	break;
984263bc	88	case 'c':
984263bc MD	89	get_list(optarg);
	90	cflag = 1;
	91	break;
	92	case 'd':
fecfcc56 JM	93	n = mbrtowc(&dchar, optarg, MB_LEN_MAX, NULL);
	94	if (dchar == '\0' \|\| n != strlen(optarg))
	95	errx(1, "bad delimiter");
	96	strcpy(dcharmb, optarg);
984263bc MD	97	dflag = 1;
	98	break;
	99	case 'f':
	100	get_list(optarg);
984263bc MD	101	fflag = 1;
	102	break;
	103	case 's':
	104	sflag = 1;
	105	break;
	106	case 'n':
fecfcc56	107	nflag = 1;
4470110f	108	break;
984263bc MD	109	case '?':
	110	default:
	111	usage();
	112	}
	113	argc -= optind;
	114	argv += optind;
	115
	116	if (fflag) {
fecfcc56 JM	117	if (bflag \|\| cflag \|\| nflag)
	118	usage();
	119	} else if (!(bflag \|\| cflag) \|\| dflag \|\| sflag)
984263bc	120	usage();
fecfcc56	121	else if (!bflag && nflag)
984263bc MD	122	usage();
984263bc MD	123
fecfcc56 JM	124	if (fflag)
	125	fcn = f_cut;
	126	else if (cflag)
	127	fcn = MB_CUR_MAX > 1 ? c_cut : b_cut;
	128	else if (bflag)
	129	fcn = nflag && MB_CUR_MAX > 1 ? b_n_cut : b_cut;
	130
	131	rval = 0;
984263bc MD	132	if (*argv)
984263bc MD	133	for (; *argv; ++argv) {
fecfcc56 JM	134	if (strcmp(*argv, "-") == 0)
	135	rval \|= fcn(stdin, "stdin");
	136	else {
	137	if (!(fp = fopen(*argv, "r"))) {
	138	warn("%s", *argv);
	139	rval = 1;
	140	continue;
	141	}
984263bc MD	142	fcn(fp, *argv);
	143	(void)fclose(fp);
	144	}
fecfcc56	145	}
984263bc	146	else
fecfcc56 JM	147	rval = fcn(stdin, "stdin");
fecfcc56 JM	148	exit(rval);
984263bc MD	149	}
984263bc MD	150
0d104663	151	static void
16777b6b	152	get_list(char *list)
984263bc MD	153	{
	154	size_t setautostart, start, stop;
	155	char *pos;
	156	char *p;
	157
	158	/*
	159	* set a byte in the positions array to indicate if a field or
	160	* column is to be selected; use +1, it's 1-based, not 0-based.
fecfcc56 JM	161	* Numbers and number ranges may be overlapping, repeated, and in
fecfcc56 JM	162	* any order. We handle "-3-5" although there's no real reason to.
984263bc MD	163	*/
	164	for (; (p = strsep(&list, ", \t")) != NULL;) {
	165	setautostart = start = stop = 0;
	166	if (*p == '-') {
	167	++p;
	168	setautostart = 1;
	169	}
	170	if (isdigit((unsigned char)*p)) {
	171	start = stop = strtol(p, &p, 10);
	172	if (setautostart && start > autostart)
	173	autostart = start;
	174	}
	175	if (*p == '-') {
	176	if (isdigit((unsigned char)p[1]))
	177	stop = strtol(p + 1, &p, 10);
	178	if (*p == '-') {
	179	++p;
	180	if (!autostop \|\| autostop > stop)
	181	autostop = stop;
	182	}
	183	}
	184	if (*p)
fecfcc56	185	errx(1, "[-bcf] list: illegal list value");
984263bc	186	if (!stop \|\| !start)
fecfcc56 JM	187	errx(1, "[-bcf] list: values may not include zero");
fecfcc56 JM	188	if (maxval < stop) {
984263bc	189	maxval = stop;
fecfcc56 JM	190	needpos(maxval + 1);
fecfcc56 JM	191	}
984263bc MD	192	for (pos = positions + start; start++ <= stop; *pos++ = 1);
	193	}
	194
	195	/* overlapping ranges */
fecfcc56	196	if (autostop && maxval > autostop) {
984263bc	197	maxval = autostop;
fecfcc56 JM	198	needpos(maxval + 1);
fecfcc56 JM	199	}
984263bc MD	200
	201	/* set autostart */
	202	if (autostart)
	203	memset(positions + 1, '1', autostart);
	204	}
	205
0d104663	206	static void
fecfcc56 JM	207	needpos(size_t n)
	208	{
	209	static size_t npos;
	210	size_t oldnpos;
	211
	212	/* Grow the positions array to at least the specified size. */
	213	if (n > npos) {
	214	oldnpos = npos;
	215	if (npos == 0)
	216	npos = n;
	217	while (n > npos)
	218	npos *= 2;
	219	if ((positions = realloc(positions, npos)) == NULL)
	220	err(1, "realloc");
	221	memset((char *)positions + oldnpos, 0, npos - oldnpos);
	222	}
	223	}
	224
	225	static int
	226	b_cut(FILE fp, const char fname __unused)
984263bc MD	227	{
	228	int ch, col;
	229	char *pos;
984263bc MD	230
	231	ch = 0;
	232	for (;;) {
	233	pos = positions + 1;
	234	for (col = maxval; col; --col) {
	235	if ((ch = getc(fp)) == EOF)
fecfcc56	236	return (0);
984263bc MD	237	if (ch == '\n')
	238	break;
	239	if (*pos++)
	240	(void)putchar(ch);
	241	}
	242	if (ch != '\n') {
	243	if (autostop)
	244	while ((ch = getc(fp)) != EOF && ch != '\n')
	245	(void)putchar(ch);
	246	else
	247	while ((ch = getc(fp)) != EOF && ch != '\n');
	248	}
	249	(void)putchar('\n');
	250	}
fecfcc56	251	return (0);
984263bc MD	252	}
984263bc MD	253
fecfcc56 JM	254	/*
	255	* Cut based on byte positions, taking care not to split multibyte characters.
	256	* Although this function also handles the case where -n is not specified,
	257	* b_cut() ought to be much faster.
	258	*/
0d104663	259	static int
fecfcc56	260	b_n_cut(FILE fp, const char fname)
4470110f	261	{
fecfcc56 JM	262	size_t col, i, lbuflen;
	263	char *lbuf;
	264	int canwrite, clen, warned;
	265	mbstate_t mbs;
	266
	267	memset(&mbs, 0, sizeof(mbs));
	268	warned = 0;
	269	while ((lbuf = fgetln(fp, &lbuflen)) != NULL) {
	270	for (col = 0; lbuflen > 0; col += clen) {
	271	if ((clen = mbrlen(lbuf, lbuflen, &mbs)) < 0) {
	272	if (!warned) {
	273	warn("%s", fname);
	274	warned = 1;
	275	}
	276	memset(&mbs, 0, sizeof(mbs));
	277	clen = 1;
	278	}
	279	if (clen == 0 \|\| *lbuf == '\n')
	280	break;
	281	if (col < maxval && !positions[1 + col]) {
	282	/*
	283	* Print the character if (1) after an initial
	284	* segment of un-selected bytes, the rest of
	285	* it is selected, and (2) the last byte is
	286	* selected.
	287	*/
	288	i = col;
	289	while (i < col + clen && i < maxval &&
	290	!positions[1 + i])
	291	i++;
	292	canwrite = i < col + clen;
	293	for (; i < col + clen && i < maxval; i++)
	294	canwrite &= positions[1 + i];
	295	if (canwrite)
	296	fwrite(lbuf, 1, clen, stdout);
4470110f	297	} else {
fecfcc56 JM	298	/*
	299	* Print the character if all of it has
	300	* been selected.
	301	*/
	302	canwrite = 1;
	303	for (i = col; i < col + clen; i++)
	304	if ((i >= maxval && !autostop) \|\|
	305	(i < maxval && !positions[1 + i])) {
	306	canwrite = 0;
	307	break;
	308	}
	309	if (canwrite)
	310	fwrite(lbuf, 1, clen, stdout);
	311	}
	312	lbuf += clen;
	313	lbuflen -= clen;
	314	}
	315	if (lbuflen > 0)
	316	putchar('\n');
4470110f	317	}
fecfcc56	318	return (warned);
4470110f JH	319	}
4470110f JH	320
fecfcc56 JM	321	static int
	322	c_cut(FILE fp, const char fname)
	323	{
	324	wint_t ch;
	325	int col;
	326	char *pos;
	327
	328	ch = 0;
	329	for (;;) {
	330	pos = positions + 1;
	331	for (col = maxval; col; --col) {
	332	if ((ch = getwc(fp)) == WEOF)
	333	goto out;
	334	if (ch == '\n')
	335	break;
	336	if (*pos++)
	337	(void)putwchar(ch);
	338	}
	339	if (ch != '\n') {
	340	if (autostop)
	341	while ((ch = getwc(fp)) != WEOF && ch != '\n')
	342	(void)putwchar(ch);
	343	else
	344	while ((ch = getwc(fp)) != WEOF && ch != '\n');
	345	}
	346	(void)putwchar('\n');
	347	}
	348	out:
	349	if (ferror(fp)) {
	350	warn("%s", fname);
	351	return (1);
	352	}
	353	return (0);
	354	}
	355
	356	static int
	357	f_cut(FILE fp, const char fname)
984263bc	358	{
fecfcc56 JM	359	wchar_t ch;
	360	int field, i, isdelim;
	361	char pos, p;
	362	wchar_t sep;
984263bc	363	int output;
fecfcc56 JM	364	char lbuf, mlbuf;
fecfcc56 JM	365	size_t clen, lbuflen, reallen;
984263bc	366
fecfcc56 JM	367	mlbuf = NULL;
	368	for (sep = dchar; (lbuf = fgetln(fp, &lbuflen)) != NULL;) {
	369	reallen = lbuflen;
984263bc MD	370	/* Assert EOL has a newline. */
	371	if (*(lbuf + lbuflen - 1) != '\n') {
	372	/* Can't have > 1 line with no trailing newline. */
	373	mlbuf = malloc(lbuflen + 1);
	374	if (mlbuf == NULL)
	375	err(1, "malloc");
	376	memcpy(mlbuf, lbuf, lbuflen);
	377	*(mlbuf + lbuflen) = '\n';
	378	lbuf = mlbuf;
fecfcc56	379	reallen++;
984263bc MD	380	}
984263bc MD	381	output = 0;
fecfcc56 JM	382	for (isdelim = 0, p = lbuf;; p += clen) {
	383	clen = mbrtowc(&ch, p, lbuf + reallen - p, NULL);
	384	if (clen == (size_t)-1 \|\| clen == (size_t)-2) {
	385	warnc(EILSEQ, "%s", fname);
	386	free(mlbuf);
	387	return (1);
	388	}
	389	if (clen == 0)
	390	clen = 1;
984263bc	391	/* this should work if newline is delimiter */
fecfcc56	392	if (ch == sep)
984263bc MD	393	isdelim = 1;
	394	if (ch == '\n') {
	395	if (!isdelim && !sflag)
	396	(void)fwrite(lbuf, lbuflen, 1, stdout);
	397	break;
	398	}
	399	}
	400	if (!isdelim)
	401	continue;
	402
	403	pos = positions + 1;
	404	for (field = maxval, p = lbuf; field; --field, ++pos) {
fecfcc56 JM	405	if (*pos && output++)
	406	for (i = 0; dcharmb[i] != '\0'; i++)
	407	putchar(dcharmb[i]);
	408	for (;;) {
	409	clen = mbrtowc(&ch, p, lbuf + reallen - p,
	410	NULL);
	411	if (clen == (size_t)-1 \|\| clen == (size_t)-2) {
	412	warnc(EILSEQ, "%s", fname);
	413	free(mlbuf);
	414	return (1);
	415	}
	416	if (clen == 0)
	417	clen = 1;
	418	p += clen;
	419	if (ch == '\n' \|\| ch == sep)
	420	break;
	421	if (*pos)
	422	for (i = 0; i < (int)clen; i++)
	423	putchar(p[i - clen]);
984263bc MD	424	}
	425	if (ch == '\n')
	426	break;
	427	}
	428	if (ch != '\n') {
	429	if (autostop) {
	430	if (output)
fecfcc56 JM	431	for (i = 0; dcharmb[i] != '\0'; i++)
fecfcc56 JM	432	putchar(dcharmb[i]);
984263bc MD	433	for (; (ch = *p) != '\n'; ++p)
	434	(void)putchar(ch);
	435	} else
	436	for (; (ch = *p) != '\n'; ++p);
	437	}
	438	(void)putchar('\n');
	439	}
984263bc	440	free(mlbuf);
fecfcc56	441	return (0);
984263bc MD	442	}
	443
	444	static void
16777b6b	445	usage(void)
984263bc MD	446	{
	447	(void)fprintf(stderr, "%s\n%s\n%s\n",
	448	"usage: cut -b list [-n] [file ...]",
	449	" cut -c list [file ...]",
fecfcc56	450	" cut -f list [-s] [-d delim] [file ...]");
984263bc MD	451	exit(1);
984263bc MD	452	}