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207 lines
4.9 KiB
C
207 lines
4.9 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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 "libbb.h"
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#if !ENABLE_LOCALE_SUPPORT
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# undef isprint
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# undef isspace
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# define isprint(c) ((unsigned)((c) - 0x20) <= (0x7e - 0x20))
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# define isspace(c) ((c) == ' ')
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#endif
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#if ENABLE_FEATURE_WC_LARGE
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# define COUNT_T unsigned long long
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# define COUNT_FMT "llu"
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#else
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# define COUNT_T unsigned
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# define COUNT_FMT "u"
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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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int wc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int wc_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *arg;
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const char *start_fmt = " %9"COUNT_FMT + 1;
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const char *fname_fmt = " %s\n";
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COUNT_T *pcounts;
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COUNT_T counts[4];
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COUNT_T totals[4];
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int num_files;
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smallint status = EXIT_SUCCESS;
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unsigned print_type;
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print_type = getopt32(argv, "lwcL");
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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[0]) {
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*--argv = (char *) bb_msg_standard_input;
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fname_fmt = "\n";
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if (!((print_type-1) & print_type)) /* exactly one option? */
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start_fmt = "%"COUNT_FMT;
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}
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memset(totals, 0, sizeof(totals));
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pcounts = counts;
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num_files = 0;
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while ((arg = *argv++) != 0) {
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FILE *fp;
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const char *s;
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unsigned u;
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unsigned linepos;
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smallint in_word;
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++num_files;
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fp = fopen_or_warn_stdin(arg);
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if (!fp) {
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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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int c;
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/* Our -w doesn't match GNU wc exactly... oh well */
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++counts[WC_CHARS];
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c = getc(fp);
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if (c == EOF) {
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if (ferror(fp)) {
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bb_simple_perror_msg(arg);
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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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}
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if (isprint_asciionly(c)) {
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++linepos;
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if (!isspace(c)) {
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in_word = 1;
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continue;
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}
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} else if ((unsigned)(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 {
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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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fclose_if_not_stdin(fp);
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OUTPUT:
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/* coreutils wc tries hard to print pretty columns
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* (saves results for all files, find max col len etc...)
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* we won't try that hard, it will bloat us too much */
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s = start_fmt;
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u = 0;
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do {
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if (print_type & (1 << u)) {
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printf(s, pcounts[u]);
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s = " %9"COUNT_FMT; /* 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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printf(fname_fmt, arg);
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}
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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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arg = "total";
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pcounts = totals;
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--argv;
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goto OUTPUT;
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}
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fflush_stdout_and_exit(status);
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}
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