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/* vi: set sw=4 ts=4: */
/*
* wc implementation for busybox
*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* BB_AUDIT SUSv3 _NOT_ compliant -- option -m is not currently supported. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/wc.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Rewritten to fix a number of problems and do some size optimizations.
* Problems in the previous busybox implementation (besides bloat) included:
* 1) broken 'wc -c' optimization (read note below)
* 2) broken handling of '-' args
* 3) no checking of ferror on EOF returns
* 4) isprint() wasn't considered when word counting.
*
* TODO:
*
* When locale support is enabled, count multibyte chars in the '-m' case.
*
* NOTES:
*
* The previous busybox wc attempted an optimization using stat for the
* case of counting chars only. I omitted that because it was broken.
* It didn't take into account the possibility of input coming from a
* pipe, or input from a file with file pointer not at the beginning.
*
* To implement such a speed optimization correctly, not only do you
* need the size, but also the file position. Note also that the
* file position may be past the end of file. Consider the example
* (adapted from example in gnu wc.c)
*
* echo hello > /tmp/testfile &&
* (dd ibs=1k skip=1 count=0 &> /dev/null; wc -c) < /tmp/testfile
*
* for which 'wc -c' should output '0'.
*/
#include "libbb.h"
#if !ENABLE_LOCALE_SUPPORT
# undef isprint
# undef isspace
# define isprint(c) ((unsigned)((c) - 0x20) <= (0x7e - 0x20))
# define isspace(c) ((c) == ' ')
#endif
#if ENABLE_FEATURE_WC_LARGE
# define COUNT_T unsigned long long
# define COUNT_FMT "llu"
#else
# define COUNT_T unsigned
# define COUNT_FMT "u"
#endif
enum {
WC_LINES = 0,
WC_WORDS = 1,
WC_CHARS = 2,
WC_LENGTH = 3
};
int wc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int wc_main(int argc UNUSED_PARAM, char **argv)
{
const char *arg;
const char *start_fmt = " %9"COUNT_FMT + 1;
const char *fname_fmt = " %s\n";
COUNT_T *pcounts;
COUNT_T counts[4];
COUNT_T totals[4];
int num_files;
smallint status = EXIT_SUCCESS;
unsigned print_type;
print_type = getopt32(argv, "lwcL");
if (print_type == 0) {
print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
}
argv += optind;
if (!argv[0]) {
*--argv = (char *) bb_msg_standard_input;
fname_fmt = "\n";
}
if (!argv[1]) { /* zero or one filename? */
if (!((print_type-1) & print_type)) /* exactly one option? */
start_fmt = "%"COUNT_FMT;
}
memset(totals, 0, sizeof(totals));
pcounts = counts;
num_files = 0;
while ((arg = *argv++) != 0) {
FILE *fp;
const char *s;
unsigned u;
unsigned linepos;
smallint in_word;
++num_files;
fp = fopen_or_warn_stdin(arg);
if (!fp) {
status = EXIT_FAILURE;
continue;
}
memset(counts, 0, sizeof(counts));
linepos = 0;
in_word = 0;
do {
int c;
/* Our -w doesn't match GNU wc exactly... oh well */
++counts[WC_CHARS];
c = getc(fp);
if (c == EOF) {
if (ferror(fp)) {
bb_simple_perror_msg(arg);
status = EXIT_FAILURE;
}
--counts[WC_CHARS];
goto DO_EOF; /* Treat an EOF as '\r'. */
}
if (isprint_asciionly(c)) {
++linepos;
if (!isspace(c)) {
in_word = 1;
continue;
}
} else if ((unsigned)(c - 9) <= 4) {
/* \t 9
* \n 10
* \v 11
* \f 12
* \r 13
*/
if (c == '\t') {
linepos = (linepos | 7) + 1;
} else { /* '\n', '\r', '\f', or '\v' */
DO_EOF:
if (linepos > counts[WC_LENGTH]) {
counts[WC_LENGTH] = linepos;
}
if (c == '\n') {
++counts[WC_LINES];
}
if (c != '\v') {
linepos = 0;
}
}
} else {
continue;
}
counts[WC_WORDS] += in_word;
in_word = 0;
if (c == EOF) {
break;
}
} while (1);
if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
totals[WC_LENGTH] = counts[WC_LENGTH];
}
totals[WC_LENGTH] -= counts[WC_LENGTH];
fclose_if_not_stdin(fp);
OUTPUT:
/* coreutils wc tries hard to print pretty columns
* (saves results for all files, find max col len etc...)
* we won't try that hard, it will bloat us too much */
s = start_fmt;
u = 0;
do {
if (print_type & (1 << u)) {
printf(s, pcounts[u]);
s = " %9"COUNT_FMT; /* Ok... restore the leading space. */
}
totals[u] += pcounts[u];
} while (++u < 4);
printf(fname_fmt, arg);
}
/* If more than one file was processed, we want the totals. To save some
* space, we set the pcounts ptr to the totals array. This has the side
* effect of trashing the totals array after outputting it, but that's
* irrelavent since we no longer need it. */
if (num_files > 1) {
num_files = 0; /* Make sure we don't get here again. */
arg = "total";
pcounts = totals;
--argv;
goto OUTPUT;
}
fflush_stdout_and_exit(status);
}
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