+/* vi: set sw=4 ts=4: */
/* fold -- wrap each input line to fit in specified width.
Written by David MacKenzie, djm@gnu.ai.mit.edu.
Modified for busybox based on coreutils v 5.0
Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>
- 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
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-#include <ctype.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <getopt.h>
-#include <sys/types.h>
-
#include "busybox.h"
-/* If nonzero, count bytes, not column positions. */
-static int count_bytes;
+static unsigned long flags;
+#define FLAG_COUNT_BYTES 1
+#define FLAG_BREAK_SPACES 2
+#define FLAG_WIDTH 4
/* Assuming the current column is COLUMN, return the column that
printing C will move the cursor to.
static int adjust_column(int column, char c)
{
- if (!count_bytes) {
+ if (!(flags & FLAG_COUNT_BYTES)) {
if (c == '\b') {
if (column > 0)
column--;
return column;
}
-extern int fold_main(int argc, char **argv)
+int fold_main(int argc, char **argv)
{
- /* If nonzero, try to break on whitespace. */
- int break_spaces;
-
- /* If nonzero, at least one of the files we read was standard input. */
- int have_read_stdin;
-
+ char *w_opt;
int width = 80;
int i;
- int optc;
int errs = 0;
- break_spaces = count_bytes = have_read_stdin = 0;
-
- /* Turn any numeric options into -w options. */
- for (i = 1; i < argc; i++) {
- char const *a = argv[i];
+ if (ENABLE_INCLUDE_SUSv2) {
+ /* Turn any numeric options into -w options. */
+ for (i = 1; i < argc; i++) {
+ char const *a = argv[i];
- if (a[0] == '-') {
- if (a[1] == '-' && !a[2])
- break;
- if (isdigit(a[1])) {
- char *s = xmalloc(strlen(a) + 2);
-
- s[0] = '-';
- s[1] = 'w';
- strcpy(s + 2, a + 1);
- argv[i] = s;
+ if (*a++ == '-') {
+ if (*a == '-' && !a[1])
+ break;
+ if (isdigit(*a)) {
+ argv[i] = xasprintf("-w%s", a);
+ }
}
}
}
- while ((optc = getopt(argc, argv, "bsw:")) > 0) {
- switch (optc) {
- case 'b': /* Count bytes rather than columns. */
- count_bytes = 1;
- break;
- case 's': /* Break at word boundaries. */
- break_spaces = 1;
- break;
- case 'w': { /* Line width. */
- width = bb_xgetlarg(optarg, 10, 1, 10000);
- break;
- }
- default:
- bb_show_usage();
- }
- }
+ flags = getopt32(argc, argv, "bsw:", &w_opt);
+ if (flags & FLAG_WIDTH)
+ width = xatoul_range(w_opt, 1, 10000);
argv += optind;
if (!*argv) {
}
do {
- FILE *istream = bb_wfopen_input(*argv);
- if (istream != NULL) {
- int c;
- int column = 0; /* Screen column where next char will go. */
- int offset_out = 0; /* Index in `line_out' for next char. */
- static char *line_out = NULL;
- static int allocated_out = 0;
-
- while ((c = getc(istream)) != EOF) {
- if (offset_out + 1 >= allocated_out) {
- allocated_out += 1024;
- line_out = xrealloc(line_out, allocated_out);
- }
+ FILE *istream = fopen_or_warn_stdin(*argv);
+ int c;
+ int column = 0; /* Screen column where next char will go. */
+ int offset_out = 0; /* Index in `line_out' for next char. */
+ static char *line_out = NULL;
+ static int allocated_out = 0;
+
+ if (istream == NULL) {
+ errs |= EXIT_FAILURE;
+ continue;
+ }
- if (c == '\n') {
- line_out[offset_out++] = c;
- fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
- column = offset_out = 0;
- continue;
- }
+ while ((c = getc(istream)) != EOF) {
+ if (offset_out + 1 >= allocated_out) {
+ allocated_out += 1024;
+ line_out = xrealloc(line_out, allocated_out);
+ }
+
+ if (c == '\n') {
+ line_out[offset_out++] = c;
+ fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
+ column = offset_out = 0;
+ continue;
+ }
rescan:
- column = adjust_column(column, c);
-
- if (column > width) {
- /* This character would make the line too long.
- Print the line plus a newline, and make this character
- start the next line. */
- if (break_spaces) {
- /* Look for the last blank. */
- int logical_end;
-
- for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
- if (isblank(line_out[logical_end])) {
- break;
- }
+ column = adjust_column(column, c);
+
+ if (column > width) {
+ /* This character would make the line too long.
+ Print the line plus a newline, and make this character
+ start the next line. */
+ if (flags & FLAG_BREAK_SPACES) {
+ /* Look for the last blank. */
+ int logical_end;
+
+ for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
+ if (isblank(line_out[logical_end])) {
+ break;
}
- if (logical_end >= 0) {
- /* Found a blank. Don't output the part after it. */
- logical_end++;
- fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
- putchar('\n');
- /* Move the remainder to the beginning of the next line.
- The areas being copied here might overlap. */
- memmove(line_out, line_out + logical_end, offset_out - logical_end);
- offset_out -= logical_end;
- for (column = i = 0; i < offset_out; i++) {
- column = adjust_column(column, line_out[i]);
- }
- goto rescan;
- }
- } else {
- if (offset_out == 0) {
- line_out[offset_out++] = c;
- continue;
+ }
+ if (logical_end >= 0) {
+ /* Found a blank. Don't output the part after it. */
+ logical_end++;
+ fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
+ putchar('\n');
+ /* Move the remainder to the beginning of the next line.
+ The areas being copied here might overlap. */
+ memmove(line_out, line_out + logical_end, offset_out - logical_end);
+ offset_out -= logical_end;
+ for (column = i = 0; i < offset_out; i++) {
+ column = adjust_column(column, line_out[i]);
}
+ goto rescan;
+ }
+ } else {
+ if (offset_out == 0) {
+ line_out[offset_out++] = c;
+ continue;
}
- line_out[offset_out++] = '\n';
- fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
- column = offset_out = 0;
- goto rescan;
}
-
- line_out[offset_out++] = c;
- }
-
- if (offset_out) {
+ line_out[offset_out++] = '\n';
fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
+ column = offset_out = 0;
+ goto rescan;
}
- if (ferror(istream) || bb_fclose_nonstdin(istream)) {
- bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
- errs |= EXIT_FAILURE;
- }
- } else {
+ line_out[offset_out++] = c;
+ }
+
+ if (offset_out) {
+ fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
+ }
+
+ if (ferror(istream) || fclose_if_not_stdin(istream)) {
+ bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
errs |= EXIT_FAILURE;
}
} while (*++argv);
- bb_fflush_stdout_and_exit(errs);
+ fflush_stdout_and_exit(errs);
}
projects / oweals / busybox.git / blobdiff