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Brand, new version of cut. This fixes the bugs in the old cut, is smaller, and

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is a sight easier to understand than the Minix cut.
This commit is contained in:
Mark Whitley 2000-08-02 18:30:11 +00:00
parent d5fa3e3e9a
commit 807f0fd637
2 changed files with 408 additions and 682 deletions
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545
coreutils/cut.c
View File

@ -1,11 +1,8 @@
/* vi: set sw=4 ts=4: */
/*
* cut implementation for busybox
* cut.c - minimalist version of cut
*
* Copyright (c) Michael J. Holme
*
* This version of cut is adapted from Minix cut and was modified
* by Erik Andersen <andersee@debian.org> to be used in busybox.
* Copyright (C) 1999,2000 by Lineo, inc.
* Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -20,351 +17,217 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original copyright notice is retained at the end of this file.
*
*/
#include "internal.h"
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#define BB_DECLARE_EXTERN
#define bb_need_help
#include "messages.c"
#define MAX_FIELD 80 /* Pointers to the beginning of each field
* are stored in columns[], if a line holds
* more than MAX_FIELD columns the array
* boundary is exceed. But unlikely at 80 */
#define MAX_ARGS 32 /* Maximum number of fields following -f or
* -c switches */
int args[MAX_ARGS * 2];
int num_args;
/* Lots of new defines, should easen maintainance... */
#define DUMP_STDIN 0 /* define for mode: no options */
#define OPTIONF 1 /* define for mode: option -f */
#define OPTIONC 2 /* define for mode: option -c */
#define OPTIONB 3 /* define for mode: option -b */
#define NOTSET 0 /* option not selected */
#define SET 1 /* option selected */
#define OPTIONS 1 /*define option -s */
/* Defines for the warnings */
#define DELIMITER_NOT_APPLICABLE 0
#define OVERRIDING_PREVIOUS_MODE 1
#define OPTION_NOT_APPLICABLE 2
#define UNKNOWN_OPTION 3
#define FILE_NOT_READABLE 4
/* Defines for the fatal errors */
#define SYNTAX_ERROR 101
#define POSITION_ERROR 102
#define LINE_TO_LONG_ERROR 103
#define RANGE_ERROR 104
#define MAX_FIELDS_EXEEDED_ERROR 105
#define MAX_ARGS_EXEEDED_ERROR 106
#include <stdlib.h>
#include <unistd.h> /* getopt */
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "internal.h"
int mode; /* 0 = dump stdin to stdout, 1=-f, 2=-c */
char delim = '\t'; /* default delimiting character */
FILE *fd;
char line[BUFSIZ];
int exit_status;
int option = 0; /* for -s option */
int cut_main(int argc, char **argv);
void warn(int warn_number, char *option);
void cuterror(int err);
void get_args(void);
void cut(void);
void warn(int warn_number, char *option)
{
static char *warn_msg[] = {
"Option -%s allowed only with -f\n",
"-%s overrides earlier option\n",
"-%s not allowed in current mode\n",
"Cannot open %s\n"
};
errorMsg(warn_msg[warn_number], option);
exit_status = warn_number + 1;
}
void cuterror(int err)
{
static char *err_mes[] = {
"syntax error\n",
"position must be >0\n",
"line longer than BUFSIZ\n",
"range must not decrease from left to right\n",
"MAX_FIELD exceeded\n",
"MAX_ARGS exceeded\n"
};
errorMsg(err_mes[err - 101]);
exit(err);
}
/* globals from other files */
extern int optind;
extern char *optarg;
void get_args()
{
int i = 0;
int arg_ptr = 0;
int flag;
/* globals in this file only */
static char part = 0; /* (b)yte, (c)har, (f)ields */
static int startpos = 1;
static int endpos = -1;
static char delim = '\t'; /* delimiter, default is tab */
static unsigned int supress_non_delimited_lines = 0;
num_args = 0;
do {
if (num_args == MAX_ARGS)
cuterror(MAX_ARGS_EXEEDED_ERROR);
if (!isdigit(line[i]) && line[i] != '-')
cuterror(SYNTAX_ERROR);
args[arg_ptr] = 1;
args[arg_ptr + 1] = BUFSIZ;
flag = 1;
while (line[i] != ',' && line[i] != 0) {
if (isdigit(line[i])) {
args[arg_ptr] = 0;
while (isdigit(line[i]))
args[arg_ptr] = 10 * args[arg_ptr] + line[i++] - '0';
if (!args[arg_ptr])
cuterror(POSITION_ERROR);
arg_ptr++;
}
if (line[i] == '-') {
arg_ptr |= 1;
i++;
flag = 0;
}
}
if (flag && arg_ptr & 1)
args[arg_ptr] = args[arg_ptr - 1];
if (args[num_args * 2] > args[num_args * 2 + 1])
cuterror(RANGE_ERROR);
num_args++;
arg_ptr = num_args * 2;
}
while (line[i++]);
}
void cut()
{
int i, j, length, maxcol=0;
char *columns[MAX_FIELD];
while (fgets(line, BUFSIZ, fd)) {
maxcol=0;
length = strlen(line) - 1;
*(line + length) = 0;
switch (mode) {
case DUMP_STDIN:
printf("%s", line);
break;
case OPTIONF:
columns[maxcol++] = line;
for (i = 0; i < length; i++) {
if (*(line + i) == delim) {
*(line + i) = 0;
if (maxcol == MAX_FIELD)
cuterror(MAX_FIELDS_EXEEDED_ERROR);
columns[maxcol] = line + i + 1;
maxcol++;
}
}
if (maxcol != 1) {
for (i = 0; i < num_args; i++) {
for (j = args[i * 2]; j <= args[i * 2 + 1]; j++)
if (j <= maxcol) {
printf("%s", columns[j - 1]);
if (i != num_args - 1 || j != args[i * 2 + 1])
putchar(delim);
}
}
} else if (option != OPTIONS) {
printf("%s",line);
}
break;
case OPTIONC:
for (i = 0; i < num_args; i++) {
for (j = args[i * 2];
j <= (args[i * 2 + 1] >
length ? length : args[i * 2 + 1]); j++)
putchar(*(line + j - 1));
}
}
if (maxcol != 1)
putchar('\n');
}
}
int cut_main(int argc, char **argv)
{
int i = 1;
int numberFilenames = 0;
while (i < argc) {
if (argv[i][0] == '-') {
switch (argv[i++][1]) {
case 'd':
if (mode == OPTIONC || mode == OPTIONB)
warn(DELIMITER_NOT_APPLICABLE, "d");
if (argc > i)
delim = argv[i++][0];
else
cuterror(SYNTAX_ERROR);
break;
case 'f':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONC || mode == OPTIONB)
warn(OVERRIDING_PREVIOUS_MODE, "f");
mode = OPTIONF;
break;
case 'b':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONF || mode == OPTIONC)
warn(OVERRIDING_PREVIOUS_MODE, "b");
mode = OPTIONB;
break;
case 'c':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONF || mode == OPTIONB)
warn(OVERRIDING_PREVIOUS_MODE, "c");
mode = OPTIONC;
break;
case 's':
option = OPTIONS;
break;
case '\0': /* - means: read from stdin */
numberFilenames++;
break;
case 'n': /* needed for Posix, but no effect here */
if (mode != OPTIONB)
warn(OPTION_NOT_APPLICABLE, "n");
break;
default:
warn(UNKNOWN_OPTION, &(argv[i - 1][1]));
}
} else {
i++;
numberFilenames++;
}
}
/* Here follow the checks, if the selected options are reasonable. */
if (mode == OPTIONB) /* since in Minix char := byte */
mode = OPTIONC;
if (mode != OPTIONF && option == OPTIONS)
warn(DELIMITER_NOT_APPLICABLE,"s");
get_args();
if (numberFilenames != 0) {
i = 1;
while (i < argc) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'f':
case 'c':
case 'b':
case 'd':
i += 2;
break;
case 'n':
case 'i':
case 's':
i++;
break;
case '\0':
fd = stdin;
i++;
cut();
break;
default:
i++;
}
} else {
if ((fd = fopen(argv[i++], "r")) == NULL) {
warn(FILE_NOT_READABLE, argv[i - 1]);
} else {
cut();
fclose(fd);
}
}
}
} else {
fd = stdin;
cut();
}
return(exit_status);
}
/* cut - extract columns from a file or stdin. Author: Michael J. Holme
*
* Copyright 1989, Michael John Holme, All rights reserved.
* This code may be freely distributed, provided that this notice
* remains intact.
*
* V1.1: 6th September 1989
*
* Bugs, criticisms, etc,
* c/o Mark Powell
* JANET sq79@uk.ac.liv
* ARPA sq79%liv.ac.uk@nsfnet-relay.ac.uk
* UUCP ...!mcvax!ukc!liv.ac.uk!sq79
*-------------------------------------------------------------------------
* Changed for POSIX1003.2/Draft10 conformance
* Thomas Brupbacher (tobr@mw.lpc.ethz.ch), September 1990.
* Changes:
* - separation of error messages ( stderr) and output (stdout).
* - support for -b and -n (no effect, -b acts as -c)
* - support for -s
*-------------------------------------------------------------------------
*/
/*
* Copyright (c) 1987,1997, Prentice Hall
* All rights reserved.
*
* Redistribution and use of the MINIX operating system in source and
* binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Prentice Hall nor the names of the software
* authors or contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
*
* decompose_list() - parses a list and puts values into startpos and endpos.
* valid list formats: N, N-, N-M, -M
*/
static void decompose_list(const char *list)
{
unsigned int nminus = 0;
char *ptr;
/* the list must contain only digits and no more than one minus sign */
for (ptr = (char *)list; *ptr; ptr++) {
if (!isdigit(*ptr) && *ptr != '-') {
fatalError("invalid byte or field list\n");
}
if (*ptr == '-') {
nminus++;
if (nminus > 1) {
fatalError("invalid byte or field list\n");
}
}
}
/* handle single value 'N' case */
if (nminus == 0) {
startpos = strtol(list, &ptr, 10);
if (startpos == 0) {
fatalError("missing list of fields\n");
}
endpos = startpos;
}
/* handle multi-value cases */
else if (nminus == 1) {
/* handle 'N-' case */
if (list[strlen(list) - 1] == '-') {
startpos = strtol(list, &ptr, 10);
}
/* handle '-M' case */
else if (list[0] == '-') {
endpos = strtol(&list[1], NULL, 10);
}
/* handle 'N-M' case */
else {
startpos = strtol(list, &ptr, 10);
endpos = strtol(ptr+1, &ptr, 10);
}
/* a sanity check */
if (startpos == 0) {
startpos = 1;
}
}
}
/*
* snippy-snip
*/
static void cut_file(FILE *file)
{
char *line;
/* go through every line in the file */
for (line = NULL; (line = get_line_from_file(file)) != NULL; free(line)) {
/* cut based on chars/bytes */
if (part == 'c' || part == 'b') {
int i;
/* a valid end position has been specified */
if (endpos > 0) {
for (i = startpos-1; i < endpos; i++) {
fputc(line[i], stdout);
}
fputc('\n', stdout);
}
/* otherwise, just go to the end of the line */
else {
for (i = startpos-1; line[i]; i++) {
fputc(line[i], stdout);
}
}
}
/* cut based on fields */
else if (part == 'f') {
char *ptr;
char *start = line;
unsigned int delims_hit = 0;
for (ptr = line; (ptr = strchr(ptr, delim)) != NULL; ptr++) {
delims_hit++;
if (delims_hit == (startpos - 1)) {
start = ptr+1;
}
if (delims_hit == endpos) {
break;
}
}
/* we didn't hit any delimeters */
if (delims_hit == 0 && !supress_non_delimited_lines) {
fputs(line, stdout);
}
/* we =did= hit some delimiters */
else if (delims_hit > 0) {
/* we have a fixed end point */
if (ptr) {
while (start < ptr) {
fputc(*start, stdout);
start++;
}
fputc('\n', stdout);
}
/* or we're just going til the end of the line */
else {
while (*start) {
fputc(*start, stdout);
start++;
}
}
}
}
}
}
extern int cut_main(int argc, char **argv)
{
int opt;
while ((opt = getopt(argc, argv, "b:c:d:f:ns")) > 0) {
switch (opt) {
case 'b':
case 'c':
case 'f':
/* make sure they didn't ask for two types of lists */
if (part != 0) {
fatalError("only one type of list may be specified");
}
part = (char)opt;
decompose_list(optarg);
break;
case 'd':
if (strlen(optarg) > 1) {
fatalError("the delimiter must be a single character\n");
}
delim = optarg[0];
break;
case 'n':
/* no-op */
break;
case 's':
supress_non_delimited_lines++;
break;
}
}
if (part == 0) {
fatalError("you must specify a list of bytes, characters, or fields\n");
}
if (supress_non_delimited_lines && part != 'f') {
fatalError("suppressing non-delimited lines makes sense
only when operating on fields\n");
}
if (delim != '\t' && part != 'f') {
fatalError("a delimiter may be specified only when operating on fields\n");
}
/* argv[(optind)..(argc-1)] should be names of file to process. If no
* files were specified or '-' was specified, take input from stdin.
* Otherwise, we process all the files specified. */
if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
cut_file(stdin);
}
else {
int i;
FILE *file;
for (i = optind; i < argc; i++) {
file = fopen(argv[i], "r");
if (file == NULL) {
/* errorMsg("%s: %s\n", argv[i], strerror(errno)); */
fprintf(stderr, "%s: %s\n", argv[i], strerror(errno));
} else {
cut_file(file);
fclose(file);
}
}
}
return 0;
}

545
cut.c
View File

@ -1,11 +1,8 @@
/* vi: set sw=4 ts=4: */
/*
* cut implementation for busybox
* cut.c - minimalist version of cut
*
* Copyright (c) Michael J. Holme
*
* This version of cut is adapted from Minix cut and was modified
* by Erik Andersen <andersee@debian.org> to be used in busybox.
* Copyright (C) 1999,2000 by Lineo, inc.
* Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -20,351 +17,217 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original copyright notice is retained at the end of this file.
*
*/
#include "internal.h"
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#define BB_DECLARE_EXTERN
#define bb_need_help
#include "messages.c"
#define MAX_FIELD 80 /* Pointers to the beginning of each field
* are stored in columns[], if a line holds
* more than MAX_FIELD columns the array
* boundary is exceed. But unlikely at 80 */
#define MAX_ARGS 32 /* Maximum number of fields following -f or
* -c switches */
int args[MAX_ARGS * 2];
int num_args;
/* Lots of new defines, should easen maintainance... */
#define DUMP_STDIN 0 /* define for mode: no options */
#define OPTIONF 1 /* define for mode: option -f */
#define OPTIONC 2 /* define for mode: option -c */
#define OPTIONB 3 /* define for mode: option -b */
#define NOTSET 0 /* option not selected */
#define SET 1 /* option selected */
#define OPTIONS 1 /*define option -s */
/* Defines for the warnings */
#define DELIMITER_NOT_APPLICABLE 0
#define OVERRIDING_PREVIOUS_MODE 1
#define OPTION_NOT_APPLICABLE 2
#define UNKNOWN_OPTION 3
#define FILE_NOT_READABLE 4
/* Defines for the fatal errors */
#define SYNTAX_ERROR 101
#define POSITION_ERROR 102
#define LINE_TO_LONG_ERROR 103
#define RANGE_ERROR 104
#define MAX_FIELDS_EXEEDED_ERROR 105
#define MAX_ARGS_EXEEDED_ERROR 106
#include <stdlib.h>
#include <unistd.h> /* getopt */
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "internal.h"
int mode; /* 0 = dump stdin to stdout, 1=-f, 2=-c */
char delim = '\t'; /* default delimiting character */
FILE *fd;
char line[BUFSIZ];
int exit_status;
int option = 0; /* for -s option */
int cut_main(int argc, char **argv);
void warn(int warn_number, char *option);
void cuterror(int err);
void get_args(void);
void cut(void);
void warn(int warn_number, char *option)
{
static char *warn_msg[] = {
"Option -%s allowed only with -f\n",
"-%s overrides earlier option\n",
"-%s not allowed in current mode\n",
"Cannot open %s\n"
};
errorMsg(warn_msg[warn_number], option);
exit_status = warn_number + 1;
}
void cuterror(int err)
{
static char *err_mes[] = {
"syntax error\n",
"position must be >0\n",
"line longer than BUFSIZ\n",
"range must not decrease from left to right\n",
"MAX_FIELD exceeded\n",
"MAX_ARGS exceeded\n"
};
errorMsg(err_mes[err - 101]);
exit(err);
}
/* globals from other files */
extern int optind;
extern char *optarg;
void get_args()
{
int i = 0;
int arg_ptr = 0;
int flag;
/* globals in this file only */
static char part = 0; /* (b)yte, (c)har, (f)ields */
static int startpos = 1;
static int endpos = -1;
static char delim = '\t'; /* delimiter, default is tab */
static unsigned int supress_non_delimited_lines = 0;
num_args = 0;
do {
if (num_args == MAX_ARGS)
cuterror(MAX_ARGS_EXEEDED_ERROR);
if (!isdigit(line[i]) && line[i] != '-')
cuterror(SYNTAX_ERROR);
args[arg_ptr] = 1;
args[arg_ptr + 1] = BUFSIZ;
flag = 1;
while (line[i] != ',' && line[i] != 0) {
if (isdigit(line[i])) {
args[arg_ptr] = 0;
while (isdigit(line[i]))
args[arg_ptr] = 10 * args[arg_ptr] + line[i++] - '0';
if (!args[arg_ptr])
cuterror(POSITION_ERROR);
arg_ptr++;
}
if (line[i] == '-') {
arg_ptr |= 1;
i++;
flag = 0;
}
}
if (flag && arg_ptr & 1)
args[arg_ptr] = args[arg_ptr - 1];
if (args[num_args * 2] > args[num_args * 2 + 1])
cuterror(RANGE_ERROR);
num_args++;
arg_ptr = num_args * 2;
}
while (line[i++]);
}
void cut()
{
int i, j, length, maxcol=0;
char *columns[MAX_FIELD];
while (fgets(line, BUFSIZ, fd)) {
maxcol=0;
length = strlen(line) - 1;
*(line + length) = 0;
switch (mode) {
case DUMP_STDIN:
printf("%s", line);
break;
case OPTIONF:
columns[maxcol++] = line;
for (i = 0; i < length; i++) {
if (*(line + i) == delim) {
*(line + i) = 0;
if (maxcol == MAX_FIELD)
cuterror(MAX_FIELDS_EXEEDED_ERROR);
columns[maxcol] = line + i + 1;
maxcol++;
}
}
if (maxcol != 1) {
for (i = 0; i < num_args; i++) {
for (j = args[i * 2]; j <= args[i * 2 + 1]; j++)
if (j <= maxcol) {
printf("%s", columns[j - 1]);
if (i != num_args - 1 || j != args[i * 2 + 1])
putchar(delim);
}
}
} else if (option != OPTIONS) {
printf("%s",line);
}
break;
case OPTIONC:
for (i = 0; i < num_args; i++) {
for (j = args[i * 2];
j <= (args[i * 2 + 1] >
length ? length : args[i * 2 + 1]); j++)
putchar(*(line + j - 1));
}
}
if (maxcol != 1)
putchar('\n');
}
}
int cut_main(int argc, char **argv)
{
int i = 1;
int numberFilenames = 0;
while (i < argc) {
if (argv[i][0] == '-') {
switch (argv[i++][1]) {
case 'd':
if (mode == OPTIONC || mode == OPTIONB)
warn(DELIMITER_NOT_APPLICABLE, "d");
if (argc > i)
delim = argv[i++][0];
else
cuterror(SYNTAX_ERROR);
break;
case 'f':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONC || mode == OPTIONB)
warn(OVERRIDING_PREVIOUS_MODE, "f");
mode = OPTIONF;
break;
case 'b':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONF || mode == OPTIONC)
warn(OVERRIDING_PREVIOUS_MODE, "b");
mode = OPTIONB;
break;
case 'c':
sprintf(line, "%s", argv[i++]);
if (mode == OPTIONF || mode == OPTIONB)
warn(OVERRIDING_PREVIOUS_MODE, "c");
mode = OPTIONC;
break;
case 's':
option = OPTIONS;
break;
case '\0': /* - means: read from stdin */
numberFilenames++;
break;
case 'n': /* needed for Posix, but no effect here */
if (mode != OPTIONB)
warn(OPTION_NOT_APPLICABLE, "n");
break;
default:
warn(UNKNOWN_OPTION, &(argv[i - 1][1]));
}
} else {
i++;
numberFilenames++;
}
}
/* Here follow the checks, if the selected options are reasonable. */
if (mode == OPTIONB) /* since in Minix char := byte */
mode = OPTIONC;
if (mode != OPTIONF && option == OPTIONS)
warn(DELIMITER_NOT_APPLICABLE,"s");
get_args();
if (numberFilenames != 0) {
i = 1;
while (i < argc) {
if (argv[i][0] == '-') {
switch (argv[i][1]) {
case 'f':
case 'c':
case 'b':
case 'd':
i += 2;
break;
case 'n':
case 'i':
case 's':
i++;
break;
case '\0':
fd = stdin;
i++;
cut();
break;
default:
i++;
}
} else {
if ((fd = fopen(argv[i++], "r")) == NULL) {
warn(FILE_NOT_READABLE, argv[i - 1]);
} else {
cut();
fclose(fd);
}
}
}
} else {
fd = stdin;
cut();
}
return(exit_status);
}
/* cut - extract columns from a file or stdin. Author: Michael J. Holme
*
* Copyright 1989, Michael John Holme, All rights reserved.
* This code may be freely distributed, provided that this notice
* remains intact.
*
* V1.1: 6th September 1989
*
* Bugs, criticisms, etc,
* c/o Mark Powell
* JANET sq79@uk.ac.liv
* ARPA sq79%liv.ac.uk@nsfnet-relay.ac.uk
* UUCP ...!mcvax!ukc!liv.ac.uk!sq79
*-------------------------------------------------------------------------
* Changed for POSIX1003.2/Draft10 conformance
* Thomas Brupbacher (tobr@mw.lpc.ethz.ch), September 1990.
* Changes:
* - separation of error messages ( stderr) and output (stdout).
* - support for -b and -n (no effect, -b acts as -c)
* - support for -s
*-------------------------------------------------------------------------
*/
/*
* Copyright (c) 1987,1997, Prentice Hall
* All rights reserved.
*
* Redistribution and use of the MINIX operating system in source and
* binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Prentice Hall nor the names of the software
* authors or contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, 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 PRENTICE HALL OR ANY AUTHORS 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.
*
* decompose_list() - parses a list and puts values into startpos and endpos.
* valid list formats: N, N-, N-M, -M
*/
static void decompose_list(const char *list)
{
unsigned int nminus = 0;
char *ptr;
/* the list must contain only digits and no more than one minus sign */
for (ptr = (char *)list; *ptr; ptr++) {
if (!isdigit(*ptr) && *ptr != '-') {
fatalError("invalid byte or field list\n");
}
if (*ptr == '-') {
nminus++;
if (nminus > 1) {
fatalError("invalid byte or field list\n");
}
}
}
/* handle single value 'N' case */
if (nminus == 0) {
startpos = strtol(list, &ptr, 10);
if (startpos == 0) {
fatalError("missing list of fields\n");
}
endpos = startpos;
}
/* handle multi-value cases */
else if (nminus == 1) {
/* handle 'N-' case */
if (list[strlen(list) - 1] == '-') {
startpos = strtol(list, &ptr, 10);
}
/* handle '-M' case */
else if (list[0] == '-') {
endpos = strtol(&list[1], NULL, 10);
}
/* handle 'N-M' case */
else {
startpos = strtol(list, &ptr, 10);
endpos = strtol(ptr+1, &ptr, 10);
}
/* a sanity check */
if (startpos == 0) {
startpos = 1;
}
}
}
/*
* snippy-snip
*/
static void cut_file(FILE *file)
{
char *line;
/* go through every line in the file */
for (line = NULL; (line = get_line_from_file(file)) != NULL; free(line)) {
/* cut based on chars/bytes */
if (part == 'c' || part == 'b') {
int i;
/* a valid end position has been specified */
if (endpos > 0) {
for (i = startpos-1; i < endpos; i++) {
fputc(line[i], stdout);
}
fputc('\n', stdout);
}
/* otherwise, just go to the end of the line */
else {
for (i = startpos-1; line[i]; i++) {
fputc(line[i], stdout);
}
}
}
/* cut based on fields */
else if (part == 'f') {
char *ptr;
char *start = line;
unsigned int delims_hit = 0;
for (ptr = line; (ptr = strchr(ptr, delim)) != NULL; ptr++) {
delims_hit++;
if (delims_hit == (startpos - 1)) {
start = ptr+1;
}
if (delims_hit == endpos) {
break;
}
}
/* we didn't hit any delimeters */
if (delims_hit == 0 && !supress_non_delimited_lines) {
fputs(line, stdout);
}
/* we =did= hit some delimiters */
else if (delims_hit > 0) {
/* we have a fixed end point */
if (ptr) {
while (start < ptr) {
fputc(*start, stdout);
start++;
}
fputc('\n', stdout);
}
/* or we're just going til the end of the line */
else {
while (*start) {
fputc(*start, stdout);
start++;
}
}
}
}
}
}
extern int cut_main(int argc, char **argv)
{
int opt;
while ((opt = getopt(argc, argv, "b:c:d:f:ns")) > 0) {
switch (opt) {
case 'b':
case 'c':
case 'f':
/* make sure they didn't ask for two types of lists */
if (part != 0) {
fatalError("only one type of list may be specified");
}
part = (char)opt;
decompose_list(optarg);
break;
case 'd':
if (strlen(optarg) > 1) {
fatalError("the delimiter must be a single character\n");
}
delim = optarg[0];
break;
case 'n':
/* no-op */
break;
case 's':
supress_non_delimited_lines++;
break;
}
}
if (part == 0) {
fatalError("you must specify a list of bytes, characters, or fields\n");
}
if (supress_non_delimited_lines && part != 'f') {
fatalError("suppressing non-delimited lines makes sense
only when operating on fields\n");
}
if (delim != '\t' && part != 'f') {
fatalError("a delimiter may be specified only when operating on fields\n");
}
/* argv[(optind)..(argc-1)] should be names of file to process. If no
* files were specified or '-' was specified, take input from stdin.
* Otherwise, we process all the files specified. */
if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
cut_file(stdin);
}
else {
int i;
FILE *file;
for (i = optind; i < argc; i++) {
file = fopen(argv[i], "r");
if (file == NULL) {
/* errorMsg("%s: %s\n", argv[i], strerror(errno)); */
fprintf(stderr, "%s: %s\n", argv[i], strerror(errno));
} else {
cut_file(file);
fclose(file);
}
}
}
return 0;
}