3450636169
math suport, cleaner math syntax error checking, moves redundant signal string tables (from kill and ash) into libbb and provides a few cleanups elsewhere.
357 lines
9.0 KiB
C
357 lines
9.0 KiB
C
/*
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* cut.c - minimalist version of cut
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc.
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* Written by Mark Whitley <markw@lineo.com>, <markw@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h> /* getopt */
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#include <string.h>
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#include <limits.h>
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#include "busybox.h"
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/* globals from other files */
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extern int optind;
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extern char *optarg;
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/* option vars */
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static char part = 0; /* (b)yte, (c)har, (f)ields */
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static unsigned int supress_non_delimited_lines = 0;
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static char delim = '\t'; /* delimiter, default is tab */
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struct cut_list {
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int startpos;
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int endpos;
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};
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static const int BOL = 0;
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static const int EOL = INT_MAX;
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static const int NON_RANGE = -1;
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static struct cut_list *cut_lists = NULL; /* growable array holding a series of lists */
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static unsigned int nlists = 0; /* number of elements in above list */
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static int cmpfunc(const void *a, const void *b)
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{
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struct cut_list *la = (struct cut_list *)a;
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struct cut_list *lb = (struct cut_list *)b;
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if (la->startpos > lb->startpos)
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return 1;
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if (la->startpos < lb->startpos)
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return -1;
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return 0;
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}
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/*
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* parse_lists() - parses a list and puts values into startpos and endpos.
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* valid list formats: N, N-, N-M, -M
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* more than one list can be seperated by commas
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*/
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static void parse_lists(char *lists)
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{
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char *ltok = NULL;
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char *ntok = NULL;
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char *junk;
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int s = 0, e = 0;
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/* take apart the lists, one by one (they are seperated with commas */
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while ((ltok = strsep(&lists, ",")) != NULL) {
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/* it's actually legal to pass an empty list */
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if (strlen(ltok) == 0)
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continue;
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/* get the start pos */
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ntok = strsep(<ok, "-");
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if (ntok == NULL) {
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fprintf(stderr, "Help ntok is null for starting position! What do I do?\n");
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} else if (strlen(ntok) == 0) {
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s = BOL;
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} else {
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s = strtoul(ntok, &junk, 10);
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if(*junk != '\0' || s < 0)
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error_msg_and_die("invalid byte or field list");
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/* account for the fact that arrays are zero based, while the user
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* expects the first char on the line to be char # 1 */
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if (s != 0)
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s--;
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}
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/* get the end pos */
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ntok = strsep(<ok, "-");
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if (ntok == NULL) {
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e = NON_RANGE;
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} else if (strlen(ntok) == 0) {
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e = EOL;
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} else {
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e = strtoul(ntok, &junk, 10);
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if(*junk != '\0' || e < 0)
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error_msg_and_die("invalid byte or field list");
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/* if the user specified and end position of 0, that means "til the
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* end of the line */
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if (e == 0)
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e = INT_MAX;
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e--; /* again, arrays are zero based, lines are 1 based */
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if (e == s)
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e = NON_RANGE;
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}
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/* if there's something left to tokenize, the user past an invalid list */
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if (ltok)
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error_msg_and_die("invalid byte or field list");
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/* add the new list */
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cut_lists = xrealloc(cut_lists, sizeof(struct cut_list) * (++nlists));
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cut_lists[nlists-1].startpos = s;
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cut_lists[nlists-1].endpos = e;
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}
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/* make sure we got some cut positions out of all that */
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if (nlists == 0)
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error_msg_and_die("missing list of positions");
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/* now that the lists are parsed, we need to sort them to make life easier
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* on us when it comes time to print the chars / fields / lines */
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qsort(cut_lists, nlists, sizeof(struct cut_list), cmpfunc);
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}
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static void cut_line_by_chars(const char *line)
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{
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int c, l;
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/* set up a list so we can keep track of what's been printed */
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char *printed = xcalloc(strlen(line), sizeof(char));
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/* print the chars specified in each cut list */
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for (c = 0; c < nlists; c++) {
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l = cut_lists[c].startpos;
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while (l < strlen(line)) {
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if (!printed[l]) {
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putchar(line[l]);
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printed[l] = 'X';
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}
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l++;
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if (cut_lists[c].endpos == NON_RANGE || l > cut_lists[c].endpos)
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break;
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}
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}
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putchar('\n'); /* cuz we were handed a chomped line */
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free(printed);
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}
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static void cut_line_by_fields(char *line)
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{
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int c, f;
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int ndelim = -1; /* zero-based / one-based problem */
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int nfields_printed = 0;
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char *field = NULL;
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char d[2] = { delim, 0 };
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char *printed;
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/* test the easy case first: does this line contain any delimiters? */
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if (strchr(line, delim) == NULL) {
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if (!supress_non_delimited_lines)
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puts(line);
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return;
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}
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/* set up a list so we can keep track of what's been printed */
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printed = xcalloc(strlen(line), sizeof(char));
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/* process each list on this line, for as long as we've got a line to process */
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for (c = 0; c < nlists && line; c++) {
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f = cut_lists[c].startpos;
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do {
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/* find the field we're looking for */
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while (line && ndelim < f) {
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field = strsep(&line, d);
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ndelim++;
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}
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/* we found it, and it hasn't been printed yet */
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if (field && ndelim == f && !printed[ndelim]) {
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/* if this isn't our first time through, we need to print the
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* delimiter after the last field that was printed */
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if (nfields_printed > 0)
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putchar(delim);
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fputs(field, stdout);
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printed[ndelim] = 'X';
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nfields_printed++;
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}
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f++;
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/* keep going as long as we have a line to work with, this is a
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* list, and we're not at the end of that list */
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} while (line && cut_lists[c].endpos != NON_RANGE && f <= cut_lists[c].endpos);
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}
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/* if we printed anything at all, we need to finish it with a newline cuz
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* we were handed a chomped line */
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putchar('\n');
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free(printed);
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}
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static void cut_file_by_lines(const char *line, unsigned int linenum)
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{
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static int c = 0;
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static int l = -1;
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/* I can't initialize this above cuz the "initializer isn't
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* constant" *sigh* */
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if (l == -1)
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l = cut_lists[c].startpos;
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/* get out if we have no more lists to process or if the lines are lower
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* than what we're interested in */
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if (c >= nlists || linenum < l)
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return;
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/* if the line we're looking for is lower than the one we were passed, it
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* means we displayed it already, so move on */
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while (l < linenum) {
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l++;
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/* move on to the next list if we're at the end of this one */
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if (cut_lists[c].endpos == NON_RANGE || l > cut_lists[c].endpos) {
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c++;
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/* get out if there's no more lists to process */
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if (c >= nlists)
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return;
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l = cut_lists[c].startpos;
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/* get out if the current line is lower than the one we just became
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* interested in */
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if (linenum < l)
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return;
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}
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}
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/* If we made it here, it means we've found the line we're looking for, so print it */
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puts(line);
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}
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/*
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* snippy-snip
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*/
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static void cut_file(FILE *file)
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{
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char *line = NULL;
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unsigned int linenum = 0; /* keep these zero-based to be consistent */
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/* go through every line in the file */
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while ((line = get_line_from_file(file)) != NULL) {
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chomp(line);
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/* cut based on chars/bytes XXX: only works when sizeof(char) == byte */
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if (part == 'c' || part == 'b')
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cut_line_by_chars(line);
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/* cut based on fields */
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else if (part == 'f') {
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if (delim == '\n')
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cut_file_by_lines(line, linenum);
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else
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cut_line_by_fields(line);
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}
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linenum++;
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free(line);
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}
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}
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extern int cut_main(int argc, char **argv)
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{
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int opt;
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while ((opt = getopt(argc, argv, "b:c:d:f:ns")) > 0) {
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switch (opt) {
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case 'b':
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case 'c':
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case 'f':
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/* make sure they didn't ask for two types of lists */
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if (part != 0) {
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error_msg_and_die("only one type of list may be specified");
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}
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part = (char)opt;
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parse_lists(optarg);
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break;
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case 'd':
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if (strlen(optarg) > 1) {
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error_msg_and_die("the delimiter must be a single character");
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}
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delim = optarg[0];
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break;
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case 'n':
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/* no-op */
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break;
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case 's':
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supress_non_delimited_lines++;
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break;
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}
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}
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if (part == 0) {
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error_msg_and_die("you must specify a list of bytes, characters, or fields");
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}
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/* non-field (char or byte) cutting has some special handling */
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if (part != 'f') {
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if (supress_non_delimited_lines) {
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error_msg_and_die("suppressing non-delimited lines makes sense"
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" only when operating on fields");
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}
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if (delim != '\t' && part != 'f') {
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error_msg_and_die("a delimiter may be specified only when operating on fields");
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}
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}
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/* argv[(optind)..(argc-1)] should be names of file to process. If no
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* files were specified or '-' was specified, take input from stdin.
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* Otherwise, we process all the files specified. */
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if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
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cut_file(stdin);
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}
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else {
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int i;
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FILE *file;
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for (i = optind; i < argc; i++) {
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file = wfopen(argv[i], "r");
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if(file) {
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cut_file(file);
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fclose(file);
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}
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}
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}
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return EXIT_SUCCESS;
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}
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