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-rw-r--r--coreutils/wc.c325
1 files changed, 187 insertions, 138 deletions
diff --git a/coreutils/wc.c b/coreutils/wc.c
index 8e3b5bb..7799015 100644
--- a/coreutils/wc.c
+++ b/coreutils/wc.c
@@ -1,8 +1,8 @@
/* vi: set sw=4 ts=4: */
/*
- * Mini wc implementation for busybox
+ * wc implementation for busybox
*
- * Copyright (C) 2000 Edward Betts <edward@debian.org>
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* 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
@@ -20,159 +20,208 @@
*
*/
+/* 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 <stdio.h>
-#include <getopt.h>
-#include <string.h>
#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "busybox.h"
-enum print_e {
- print_lines = 1,
- print_words = 2,
- print_chars = 4,
- print_length = 8
+#ifdef CONFIG_LOCALE_SUPPORT
+#include <locale.h>
+#include <ctype.h>
+#define isspace_given_isprint(c) isspace(c)
+#else
+#undef isspace
+#undef isprint
+#define isspace(c) ((((c) == ' ') || (((unsigned int)((c) - 9)) <= (13 - 9))))
+#define isprint(c) (((unsigned int)((c) - 0x20)) <= (0x7e - 0x20))
+#define isspace_given_isprint(c) ((c) == ' ')
+#endif
+
+enum {
+ WC_LINES = 0,
+ WC_WORDS = 1,
+ WC_CHARS = 2,
+ WC_LENGTH = 3
};
-static unsigned int total_lines = 0;
-static unsigned int total_words = 0;
-static unsigned int total_chars = 0;
-static unsigned int max_length = 0;
-static char print_type = 0;
+/* Note: If this changes, remember to change the initialization of
+ * 'name' in wc_main. It needs to point to the terminating nul. */
+static const char wc_opts[] = "lwcL"; /* READ THE WARNING ABOVE! */
-static void print_counts(const unsigned int lines, const unsigned int words,
- const unsigned int chars, const unsigned int length, const char *name)
-{
- int output = 0;
+enum {
+ OP_INC_LINE = 1, /* OP_INC_LINE must be 1. */
+ OP_SPACE = 2,
+ OP_NEWLINE = 4,
+ OP_TAB = 8,
+ OP_NUL = 16,
+};
- if (print_type & print_lines) {
- printf("%7d", lines);
- output++;
- }
- if (print_type & print_words) {
- if (output++)
- putchar(' ');
- printf("%7d", words);
- }
- if (print_type & print_chars) {
- if (output++)
- putchar(' ');
- printf("%7d", chars);
- }
- if (print_type & print_length) {
- if (output++)
- putchar(' ');
- printf("%7d", length);
- }
- if (*name) {
- printf(" %s", name);
- }
- putchar('\n');
-}
+/* Note: If fmt_str changes, the offsets to 's' in the OUTPUT section
+ * will need to be updated. */
+static const char fmt_str[] = " %7u\0 %s\n";
+static const char total_str[] = "total";
-static void wc_file(FILE * file, const char *name)
+int wc_main(int argc, char **argv)
{
- unsigned int lines = 0;
- unsigned int words = 0;
- unsigned int chars = 0;
- unsigned int length = 0;
- unsigned int linepos = 0;
- char in_word = 0;
+ FILE *fp;
+ const char *s;
+ unsigned int *pcounts;
+ unsigned int counts[4];
+ unsigned int totals[4];
+ unsigned int linepos;
+ unsigned int u;
+ int num_files = 0;
int c;
-
- while ((c = getc(file)) != EOF) {
- chars++;
- switch (c) {
- case '\n':
- lines++;
- case '\r':
- case '\f':
- if (linepos > length)
- length = linepos;
- linepos = 0;
- goto word_separator;
- case '\t':
- linepos += 8 - (linepos % 8);
- goto word_separator;
- case ' ':
- linepos++;
- case '\v':
-word_separator:
- if (in_word) {
- in_word = 0;
- words++;
- }
- break;
- default:
- linepos++;
- in_word = 1;
- break;
- }
- }
- if (linepos > length) {
- length = linepos;
- }
- if (in_word) {
- words++;
+ char status = EXIT_SUCCESS;
+ char in_word;
+ char print_type;
+
+ print_type = bb_getopt_ulflags(argc, argv, wc_opts);
+
+ if (print_type == 0) {
+ print_type = (1 << WC_LINES) | (1 << WC_WORDS) | (1 << WC_CHARS);
}
- print_counts(lines, words, chars, length, name);
- total_lines += lines;
- total_words += words;
- total_chars += chars;
- if (length > max_length) {
- max_length = length;
+
+ argv += optind;
+ if (!*argv) {
+ *--argv = (char *) bb_msg_standard_input;
}
-}
-
-int wc_main(int argc, char **argv)
-{
- int opt;
-
- while ((opt = getopt(argc, argv, "clLw")) > 0) {
- switch (opt) {
- case 'c':
- print_type |= print_chars;
- break;
- case 'l':
- print_type |= print_lines;
- break;
- case 'L':
- print_type |= print_length;
- break;
- case 'w':
- print_type |= print_words;
- break;
- default:
- show_usage();
+
+ memset(totals, 0, sizeof(totals));
+
+ pcounts = counts;
+
+ do {
+ ++num_files;
+ if (!(fp = bb_wfopen_input(*argv))) {
+ status = EXIT_FAILURE;
+ continue;
}
- }
-
- if (print_type == 0) {
- print_type = print_lines | print_words | print_chars;
- }
-
- if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
- wc_file(stdin, "");
- } else {
- unsigned short num_files_counted = 0;
- while (optind < argc) {
- if (print_type == print_chars) {
- struct stat statbuf;
- stat(argv[optind], &statbuf);
- print_counts(0, 0, statbuf.st_size, 0, argv[optind]);
- total_chars += statbuf.st_size;
+
+ memset(counts, 0, sizeof(counts));
+ linepos = 0;
+ in_word = 0;
+
+ do {
+ ++counts[WC_CHARS];
+ c = getc(fp);
+ if (isprint(c)) {
+ ++linepos;
+ if (!isspace_given_isprint(c)) {
+ in_word = 1;
+ continue;
+ }
+ } else if (((unsigned int)(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 if (c == EOF) {
+ if (ferror(fp)) {
+ bb_perror_msg("%s", *argv);
+ status = EXIT_FAILURE;
+ }
+ --counts[WC_CHARS];
+ goto DO_EOF; /* Treat an EOF as '\r'. */
} else {
- FILE *file;
- file = xfopen(argv[optind], "r");
- wc_file(file, argv[optind]);
- fclose(file);
+ continue;
+ }
+
+ counts[WC_WORDS] += in_word;
+ in_word = 0;
+ if (c == EOF) {
+ break;
}
- optind++;
- num_files_counted++;
+ } while (1);
+
+ if (totals[WC_LENGTH] < counts[WC_LENGTH]) {
+ totals[WC_LENGTH] = counts[WC_LENGTH];
}
- if (num_files_counted > 1) {
- print_counts(total_lines, total_words, total_chars, max_length, "total");
+ totals[WC_LENGTH] -= counts[WC_LENGTH];
+
+ bb_fclose_nonstdin(fp);
+
+ OUTPUT:
+ s = fmt_str + 1; /* Skip the leading space on 1st pass. */
+ u = 0;
+ do {
+ if (print_type & (1 << u)) {
+ bb_printf(s, pcounts[u]);
+ s = fmt_str; /* Ok... restore the leading space. */
+ }
+ totals[u] += pcounts[u];
+ } while (++u < 4);
+
+ s += 8; /* Set the format to the empty string. */
+
+ if (*argv != bb_msg_standard_input) {
+ s -= 3; /* We have a name, so do %s conversion. */
}
+ bb_printf(s, *argv);
+
+ } while (*++argv);
+
+ /* 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. */
+ *--argv = (char *) total_str;
+ pcounts = totals;
+ goto OUTPUT;
}
-
- return(EXIT_SUCCESS);
+
+ bb_fflush_stdout_and_exit(status);
}
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