freebsd-dev/usr.bin/cut/cut.c
Pedro F. Giffuni 8a16b7a18f General further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.
2017-11-20 19:49:47 +00:00

482 lines
11 KiB
C

/*
* SPDX-License-Identifier: BSD-3-Clause
*
* 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 const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
static const char sccsid[] = "@(#)cut.c 8.3 (Berkeley) 5/4/95";
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 int wflag;
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 int is_delim(wchar_t);
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:snw")) != -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 'w':
wflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (fflag) {
if (bflag || cflag || nflag || (wflag && dflag))
usage();
} else if (!(bflag || cflag) || dflag || sflag || wflag)
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
is_delim(wchar_t ch)
{
if (wflag) {
if (ch == ' ' || ch == '\t')
return 1;
} else {
if (ch == dchar)
return 1;
}
return 0;
}
static int
f_cut(FILE *fp, const char *fname)
{
wchar_t ch;
int field, i, isdelim;
char *pos, *p;
int output;
char *lbuf, *mlbuf;
size_t clen, lbuflen, reallen;
mlbuf = NULL;
while ((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 (is_delim(ch))
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' || is_delim(ch)) {
/* compress whitespace */
if (wflag && ch != '\n')
while (is_delim(*p))
p++;
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] [-w | -d delim] [file ...]");
exit(1);
}