--- /dev/null
+/* fold -- wrap each input line to fit in specified width.
+
+ Written by David MacKenzie, djm@gnu.ai.mit.edu.
+ Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
+
+ Modified for busybox based on coreutils v 5.0
+ Copyright (C) 2003 Glenn McGrath <bug1@optushome.com.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.
+*/
+
+#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;
+
+/* Assuming the current column is COLUMN, return the column that
+ printing C will move the cursor to.
+ The first column is 0. */
+
+static int adjust_column(int column, char c)
+{
+ if (!count_bytes) {
+ if (c == '\b') {
+ if (column > 0)
+ column--;
+ } else if (c == '\r')
+ column = 0;
+ else if (c == '\t')
+ column = column + 8 - column % 8;
+ else /* if (isprint (c)) */
+ column++;
+ } else
+ column++;
+ return column;
+}
+
+extern 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;
+
+ 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 (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;
+ }
+ }
+ }
+
+ 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. */
+ long int tmp_long;
+ char *end_ptr;
+
+ errno = 0;
+ tmp_long = strtol(optarg, &end_ptr, 10);
+ if (!end_ptr || errno || tmp_long < 1) {
+ bb_error_msg_and_die("invalid number of columns: `%s'", optarg);
+ }
+ width = (int) tmp_long;
+ break;
+ }
+ default:
+ bb_show_usage();
+ }
+ }
+
+ argv += optind;
+ if (!*argv) {
+ *--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);
+ }
+
+ 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;
+ }
+ }
+ 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) {
+ fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
+ }
+
+ if (ferror(istream) || bb_fclose_nonstdin(istream)) {
+ bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
+ errs |= EXIT_FAILURE;
+ }
+ } else {
+ errs |= EXIT_FAILURE;
+ }
+ } while (*++argv);
+
+ bb_fflush_stdout_and_exit(errs);
+}
projects / oweals / busybox.git / commitdiff