/* vi: set sw=4 ts=4: */
/*
- * cut implementation for busybox
+ * cut.c - minimalist version of cut
*
- * Copyright (c) Michael J. Holme
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
+ * Written by Mark Whitley <markw@codepoet.org>
+ * debloated by Bernhard Reutner-Fischer
*
- * This version of cut is adapted from Minix cut and was modified
- * by Erik Andersen <andersee@debian.org> to be used in busybox.
- *
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#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
-
-
-int mode; /* 0 = dump stdin to stdout, 1=-f, 2=-c */
-char delim = '\t'; /* default delimiting character */
-FILE *fd;
-char *name;
-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[] = {
- "%s: Option -%s allowed only with -f\n",
- "%s: -%s overrides earlier option\n",
- "%s: -%s not allowed in current mode\n",
- "%s: Cannot open %s\n"
- };
+//usage:#define cut_trivial_usage
+//usage: "[OPTIONS] [FILE]..."
+//usage:#define cut_full_usage "\n\n"
+//usage: "Print selected fields from each input FILE to stdout\n"
+//usage: "\n -b LIST Output only bytes from LIST"
+//usage: "\n -c LIST Output only characters from LIST"
+//usage: "\n -d CHAR Use CHAR instead of tab as the field delimiter"
+//usage: "\n -s Output only the lines containing delimiter"
+//usage: "\n -f N Print only these fields"
+//usage: "\n -n Ignored"
+//usage:
+//usage:#define cut_example_usage
+//usage: "$ echo \"Hello world\" | cut -f 1 -d ' '\n"
+//usage: "Hello\n"
+//usage: "$ echo \"Hello world\" | cut -f 2 -d ' '\n"
+//usage: "world\n"
- fprintf(stderr, warn_msg[warn_number], name, option);
- exit_status = warn_number + 1;
+#include "libbb.h"
-}
+/* This is a NOEXEC applet. Be very careful! */
-void cuterror(int err)
-{
- static char *err_mes[] = {
- "%s: syntax error\n",
- "%s: position must be >0\n",
- "%s: line longer than BUFSIZ\n",
- "%s: range must not decrease from left to right\n",
- "%s: MAX_FIELD exceeded\n",
- "%s: MAX_ARGS exceeded\n"
- };
-
- fprintf(stderr, err_mes[err - 101], name);
- exit(err);
-}
+/* option vars */
+static const char optstring[] ALIGN1 = "b:c:f:d:sn";
+#define CUT_OPT_BYTE_FLGS (1 << 0)
+#define CUT_OPT_CHAR_FLGS (1 << 1)
+#define CUT_OPT_FIELDS_FLGS (1 << 2)
+#define CUT_OPT_DELIM_FLGS (1 << 3)
+#define CUT_OPT_SUPPRESS_FLGS (1 << 4)
+
+struct cut_list {
+ int startpos;
+ int endpos;
+};
-void get_args()
+enum {
+ BOL = 0,
+ EOL = INT_MAX,
+ NON_RANGE = -1
+};
+
+static int cmpfunc(const void *a, const void *b)
{
- int i = 0;
- int arg_ptr = 0;
- int flag;
-
- 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++]);
+ return (((struct cut_list *) a)->startpos -
+ ((struct cut_list *) b)->startpos);
}
-
-void cut()
+static void cut_file(FILE *file, char delim, const struct cut_list *cut_lists, unsigned nlists)
{
- 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;
+ unsigned linenum = 0; /* keep these zero-based to be consistent */
+
+ /* go through every line in the file */
+ while ((line = xmalloc_fgetline(file)) != NULL) {
+
+ /* set up a list so we can keep track of what's been printed */
+ int linelen = strlen(line);
+ char *printed = xzalloc(linelen + 1);
+ char *orig_line = line;
+ unsigned cl_pos = 0;
+ int spos;
+
+ /* cut based on chars/bytes XXX: only works when sizeof(char) == byte */
+ if (option_mask32 & (CUT_OPT_CHAR_FLGS | CUT_OPT_BYTE_FLGS)) {
+ /* print the chars specified in each cut list */
+ for (; cl_pos < nlists; cl_pos++) {
+ spos = cut_lists[cl_pos].startpos;
+ while (spos < linelen) {
+ if (!printed[spos]) {
+ printed[spos] = 'X';
+ putchar(line[spos]);
+ }
+ spos++;
+ if (spos > cut_lists[cl_pos].endpos
+ /* NON_RANGE is -1, so if below is true,
+ * the above was true too (spos is >= 0) */
+ /* || cut_lists[cl_pos].endpos == NON_RANGE */
+ ) {
+ break;
+ }
}
}
- 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 (delim == '\n') { /* cut by lines */
+ spos = cut_lists[cl_pos].startpos;
+
+ /* get out if we have no more lists to process or if the lines
+ * are lower than what we're interested in */
+ if (((int)linenum < spos) || (cl_pos >= nlists))
+ goto next_line;
+
+ /* if the line we're looking for is lower than the one we were
+ * passed, it means we displayed it already, so move on */
+ while (spos < (int)linenum) {
+ spos++;
+ /* go to the next list if we're at the end of this one */
+ if (spos > cut_lists[cl_pos].endpos
+ || cut_lists[cl_pos].endpos == NON_RANGE
+ ) {
+ cl_pos++;
+ /* get out if there's no more lists to process */
+ if (cl_pos >= nlists)
+ goto next_line;
+ spos = cut_lists[cl_pos].startpos;
+ /* get out if the current line is lower than the one
+ * we just became interested in */
+ if ((int)linenum < spos)
+ goto next_line;
}
- } 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 we made it here, it means we've found the line we're
+ * looking for, so print it */
+ puts(line);
+ goto next_line;
+ } else { /* cut by fields */
+ int ndelim = -1; /* zero-based / one-based problem */
+ int nfields_printed = 0;
+ char *field = NULL;
+ char delimiter[2];
+
+ delimiter[0] = delim;
+ delimiter[1] = 0;
+
+ /* does this line contain any delimiters? */
+ if (strchr(line, delim) == NULL) {
+ if (!(option_mask32 & CUT_OPT_SUPPRESS_FLGS))
+ puts(line);
+ goto next_line;
+ }
+
+ /* process each list on this line, for as long as we've got
+ * a line to process */
+ for (; cl_pos < nlists && line; cl_pos++) {
+ spos = cut_lists[cl_pos].startpos;
+ do {
+ /* find the field we're looking for */
+ while (line && ndelim < spos) {
+ field = strsep(&line, delimiter);
+ ndelim++;
+ }
+
+ /* we found it, and it hasn't been printed yet */
+ if (field && ndelim == spos && !printed[ndelim]) {
+ /* if this isn't our first time through, we need to
+ * print the delimiter after the last field that was
+ * printed */
+ if (nfields_printed > 0)
+ putchar(delim);
+ fputs(field, stdout);
+ printed[ndelim] = 'X';
+ nfields_printed++; /* shouldn't overflow.. */
+ }
+
+ spos++;
+
+ /* keep going as long as we have a line to work with,
+ * this is a list, and we're not at the end of that
+ * list */
+ } while (spos <= cut_lists[cl_pos].endpos && line
+ && cut_lists[cl_pos].endpos != NON_RANGE);
}
}
- if (maxcol != 1)
- putchar('\n');
+ /* if we printed anything at all, we need to finish it with a
+ * newline cuz we were handed a chomped line */
+ putchar('\n');
+ next_line:
+ linenum++;
+ free(printed);
+ free(orig_line);
}
}
-
-int cut_main(int argc, char **argv)
+int cut_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int cut_main(int argc UNUSED_PARAM, char **argv)
{
- int i = 1;
- int numberFilenames = 0;
-
- name = argv[0];
-
- if (argc == 1 || strcmp(argv[1], dash_dash_help)==0)
- usage( "cut [OPTION]... [FILE]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nPrints selected fields from each input FILE to standard output.\n\n"
- "Options:\n"
- "\t-b LIST\tOutput only bytes from LIST\n"
- "\t-c LIST\tOutput only characters from LIST\n"
- "\t-d CHAR\tUse CHAR instead of tab as the field delimiter\n"
- "\t-s\tOnly output Lines if the include DELIM\n"
- "\t-f N\tPrint only these fields\n"
- "\t-n\tIgnored\n"
-#endif
- );
-
- 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++;
+ /* growable array holding a series of lists */
+ struct cut_list *cut_lists = NULL;
+ unsigned nlists = 0; /* number of elements in above list */
+ char delim = '\t'; /* delimiter, default is tab */
+ char *sopt, *ltok;
+ unsigned opt;
+
+ opt_complementary = "b--bcf:c--bcf:f--bcf";
+ opt = getopt32(argv, optstring, &sopt, &sopt, &sopt, <ok);
+// argc -= optind;
+ argv += optind;
+ if (!(opt & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS)))
+ bb_error_msg_and_die("expected a list of bytes, characters, or fields");
+
+ if (opt & CUT_OPT_DELIM_FLGS) {
+ if (ltok[0] && ltok[1]) { /* more than 1 char? */
+ bb_error_msg_and_die("the delimiter must be a single character");
}
+ delim = ltok[0];
}
-/* 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++;
- }
+ /* non-field (char or byte) cutting has some special handling */
+ if (!(opt & CUT_OPT_FIELDS_FLGS)) {
+ static const char _op_on_field[] ALIGN1 = " only when operating on fields";
+
+ if (opt & CUT_OPT_SUPPRESS_FLGS) {
+ bb_error_msg_and_die
+ ("suppressing non-delimited lines makes sense%s",
+ _op_on_field);
+ }
+ if (delim != '\t') {
+ bb_error_msg_and_die
+ ("a delimiter may be specified%s", _op_on_field);
+ }
+ }
+
+ /*
+ * parse list and put values into startpos and endpos.
+ * valid list formats: N, N-, N-M, -M
+ * more than one list can be separated by commas
+ */
+ {
+ char *ntok;
+ int s = 0, e = 0;
+
+ /* take apart the lists, one by one (they are separated with commas) */
+ while ((ltok = strsep(&sopt, ",")) != NULL) {
+
+ /* it's actually legal to pass an empty list */
+ if (!ltok[0])
+ continue;
+
+ /* get the start pos */
+ ntok = strsep(<ok, "-");
+ if (!ntok[0]) {
+ s = BOL;
} else {
- if ((fd = fopen(argv[i++], "r")) == NULL) {
- warn(FILE_NOT_READABLE, argv[i - 1]);
- } else {
- cut();
- fclose(fd);
- }
+ s = xatoi_positive(ntok);
+ /* account for the fact that arrays are zero based, while
+ * the user expects the first char on the line to be char #1 */
+ if (s != 0)
+ s--;
}
+
+ /* get the end pos */
+ if (ltok == NULL) {
+ e = NON_RANGE;
+ } else if (!ltok[0]) {
+ e = EOL;
+ } else {
+ e = xatoi_positive(ltok);
+ /* if the user specified and end position of 0,
+ * that means "til the end of the line" */
+ if (e == 0)
+ e = EOL;
+ e--; /* again, arrays are zero based, lines are 1 based */
+ if (e == s)
+ e = NON_RANGE;
+ }
+
+ /* add the new list */
+ cut_lists = xrealloc_vector(cut_lists, 4, nlists);
+ /* NB: startpos is always >= 0,
+ * while endpos may be = NON_RANGE (-1) */
+ cut_lists[nlists].startpos = s;
+ cut_lists[nlists].endpos = e;
+ nlists++;
}
- } else {
- fd = stdin;
- cut();
- }
- return(exit_status);
-}
+ /* make sure we got some cut positions out of all that */
+ if (nlists == 0)
+ bb_error_msg_and_die("missing list of positions");
-/* 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
- *-------------------------------------------------------------------------
- */
+ /* now that the lists are parsed, we need to sort them to make life
+ * easier on us when it comes time to print the chars / fields / lines
+ */
+ qsort(cut_lists, nlists, sizeof(cut_lists[0]), cmpfunc);
+ }
-/*
- * 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.
- *
- */
+ {
+ int retval = EXIT_SUCCESS;
+ if (!*argv)
+ *--argv = (char *)"-";
+ do {
+ FILE *file = fopen_or_warn_stdin(*argv);
+ if (!file) {
+ retval = EXIT_FAILURE;
+ continue;
+ }
+ cut_file(file, delim, cut_lists, nlists);
+ fclose_if_not_stdin(file);
+ } while (*++argv);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(cut_lists);
+ fflush_stdout_and_exit(retval);
+ }
+}
projects / platform / upstream / busybox.git / blobdiff