diff options
author | Mark Whitley <markw@lineo.com> | 2000-08-02 22:30:11 +0400 |
---|---|---|
committer | Mark Whitley <markw@lineo.com> | 2000-08-02 22:30:11 +0400 |
commit | 807f0fd637ecc25e60c81e41ad969c177c7df327 (patch) | |
tree | f1c0645b6dc9c6c87e41280b822bc3b230e1f168 /cut.c | |
parent | d5fa3e3e9a8a1548b2e405ca9684bebbf946fd4f (diff) |
Brand, new version of cut. This fixes the bugs in the old cut, is smaller, and
is a sight easier to understand than the Minix cut.
Diffstat (limited to 'cut.c')
-rw-r--r-- | cut.c | 479 |
1 files changed, 171 insertions, 308 deletions
@@ -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 <stdio.h> +#include <stdlib.h> +#include <unistd.h> /* getopt */ #include <string.h> +#include <ctype.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 - - -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); +#include "internal.h" -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; +/* globals from other files */ +extern int optind; +extern char *optarg; -} - -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 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; -void get_args() +/* + * 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) { - int i = 0; - int arg_ptr = 0; - int flag; + unsigned int nminus = 0; + char *ptr; - num_args = 0; - do { - if (num_args == MAX_ARGS) - cuterror(MAX_ARGS_EXEEDED_ERROR); - if (!isdigit(line[i]) && line[i] != '-') - cuterror(SYNTAX_ERROR); + /* 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"); + } + } + } - args[arg_ptr] = 1; - args[arg_ptr + 1] = BUFSIZ; - flag = 1; + /* 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); + } - 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; - } + /* a sanity check */ + if (startpos == 0) { + startpos = 1; } - 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() +/* + * snippy-snip + */ +static void cut_file(FILE *file) { - 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++; + 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); } - 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); - } + /* otherwise, just go to the end of the line */ + else { + for (i = startpos-1; line[i]; i++) { + fputc(line[i], stdout); } - } 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)); + } + /* 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++; + } + } } } - if (maxcol != 1) - putchar('\n'); } } -int cut_main(int argc, char **argv) +extern int cut_main(int argc, char **argv) { - int i = 1; - int numberFilenames = 0; + int opt; - 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; + while ((opt = getopt(argc, argv, "b:c:d:f:ns")) > 0) { + switch (opt) { 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; + 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 's': - option = OPTIONS; - + case 'd': + if (strlen(optarg) > 1) { + fatalError("the delimiter must be a single character\n"); + } + delim = optarg[0]; break; - case '\0': /* - means: read from stdin */ - numberFilenames++; + case 'n': + /* no-op */ break; - case 'n': /* needed for Posix, but no effect here */ - if (mode != OPTIONB) - warn(OPTION_NOT_APPLICABLE, "n"); + case 's': + supress_non_delimited_lines++; 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++; - } + 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 { - if ((fd = fopen(argv[i++], "r")) == NULL) { - warn(FILE_NOT_READABLE, argv[i - 1]); - } else { - cut(); - fclose(fd); - } + cut_file(file); + fclose(file); } } - } else { - fd = stdin; - cut(); } - return(exit_status); + return 0; } - -/* 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. - * - */ - - |