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228 lines
5.8 KiB
C
228 lines
5.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* wc implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@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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/* BB_AUDIT SUSv3 _NOT_ compliant -- option -m is not currently supported. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/wc.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Rewritten to fix a number of problems and do some size optimizations.
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* Problems in the previous busybox implementation (besides bloat) included:
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* 1) broken 'wc -c' optimization (read note below)
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* 2) broken handling of '-' args
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* 3) no checking of ferror on EOF returns
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* 4) isprint() wasn't considered when word counting.
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*
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* TODO:
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*
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* When locale support is enabled, count multibyte chars in the '-m' case.
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*
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* NOTES:
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*
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* The previous busybox wc attempted an optimization using stat for the
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* case of counting chars only. I omitted that because it was broken.
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* It didn't take into account the possibility of input coming from a
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* pipe, or input from a file with file pointer not at the beginning.
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*
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* To implement such a speed optimization correctly, not only do you
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* need the size, but also the file position. Note also that the
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* file position may be past the end of file. Consider the example
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* (adapted from example in gnu wc.c)
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*
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* echo hello > /tmp/testfile &&
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* (dd ibs=1k skip=1 count=0 &> /dev/null ; wc -c) < /tmp/testfile
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*
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* for which 'wc -c' should output '0'.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "busybox.h"
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#ifdef CONFIG_LOCALE_SUPPORT
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#include <locale.h>
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#include <ctype.h>
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#define isspace_given_isprint(c) isspace(c)
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#else
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#undef isspace
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#undef isprint
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#define isspace(c) ((((c) == ' ') || (((unsigned int)((c) - 9)) <= (13 - 9))))
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#define isprint(c) (((unsigned int)((c) - 0x20)) <= (0x7e - 0x20))
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#define isspace_given_isprint(c) ((c) == ' ')
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#endif
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enum {
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WC_LINES = 0,
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WC_WORDS = 1,
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WC_CHARS = 2,
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WC_LENGTH = 3
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};
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/* Note: If this changes, remember to change the initialization of
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* 'name' in wc_main. It needs to point to the terminating nul. */
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static const char wc_opts[] = "lwcL"; /* READ THE WARNING ABOVE! */
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enum {
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OP_INC_LINE = 1, /* OP_INC_LINE must be 1. */
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OP_SPACE = 2,
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OP_NEWLINE = 4,
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OP_TAB = 8,
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OP_NUL = 16,
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};
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/* Note: If fmt_str changes, the offsets to 's' in the OUTPUT section
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* will need to be updated. */
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static const char fmt_str[] = " %7u\0 %s\n";
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static const char total_str[] = "total";
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int wc_main(int argc, char **argv)
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{
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FILE *fp;
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const char *s;
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unsigned int *pcounts;
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unsigned int counts[4];
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unsigned int totals[4];
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unsigned int linepos;
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unsigned int u;
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int num_files = 0;
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int c;
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char status = EXIT_SUCCESS;
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char in_word;
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char print_type;
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print_type = bb_getopt_ulflags(argc, argv, wc_opts);
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if (print_type == 0) {
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print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
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}
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argv += optind;
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if (!*argv) {
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*--argv = (char *) bb_msg_standard_input;
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}
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memset(totals, 0, sizeof(totals));
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pcounts = counts;
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do {
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++num_files;
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if (!(fp = bb_wfopen_input(*argv))) {
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status = EXIT_FAILURE;
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continue;
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}
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memset(counts, 0, sizeof(counts));
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linepos = 0;
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in_word = 0;
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do {
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++counts[WC_CHARS];
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c = getc(fp);
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if (isprint(c)) {
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++linepos;
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if (!isspace_given_isprint(c)) {
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in_word = 1;
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continue;
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}
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} else if (((unsigned int)(c - 9)) <= 4) {
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/* \t 9
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* \n 10
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* \v 11
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* \f 12
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* \r 13
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*/
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if (c == '\t') {
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linepos = (linepos | 7) + 1;
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} else { /* '\n', '\r', '\f', or '\v' */
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DO_EOF:
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if (linepos > counts[WC_LENGTH]) {
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counts[WC_LENGTH] = linepos;
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}
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if (c == '\n') {
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++counts[WC_LINES];
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}
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if (c != '\v') {
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linepos = 0;
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}
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}
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} else if (c == EOF) {
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if (ferror(fp)) {
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bb_perror_msg("%s", *argv);
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status = EXIT_FAILURE;
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}
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--counts[WC_CHARS];
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goto DO_EOF; /* Treat an EOF as '\r'. */
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} else {
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continue;
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}
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counts[WC_WORDS] += in_word;
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in_word = 0;
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if (c == EOF) {
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break;
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}
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} while (1);
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if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
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totals[WC_LENGTH] = counts[WC_LENGTH];
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}
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totals[WC_LENGTH] -= counts[WC_LENGTH];
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bb_fclose_nonstdin(fp);
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OUTPUT:
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s = fmt_str + 1; /* Skip the leading space on 1st pass. */
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u = 0;
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do {
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if (print_type & (1 << u)) {
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bb_printf(s, pcounts[u]);
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s = fmt_str; /* Ok... restore the leading space. */
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}
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totals[u] += pcounts[u];
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} while (++u < 4);
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s += 8; /* Set the format to the empty string. */
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if (*argv != bb_msg_standard_input) {
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s -= 3; /* We have a name, so do %s conversion. */
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}
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bb_printf(s, *argv);
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} while (*++argv);
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/* If more than one file was processed, we want the totals. To save some
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* space, we set the pcounts ptr to the totals array. This has the side
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* effect of trashing the totals array after outputting it, but that's
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* irrelavent since we no longer need it. */
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if (num_files > 1) {
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num_files = 0; /* Make sure we don't get here again. */
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*--argv = (char *) total_str;
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pcounts = totals;
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goto OUTPUT;
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}
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bb_fflush_stdout_and_exit(status);
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}
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