155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/* fold -- wrap each input line to fit in specified width.
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Written by David MacKenzie, djm@gnu.ai.mit.edu.
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Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
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Modified for busybox based on coreutils v 5.0
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Copyright (C) 2003 Glenn McGrath
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Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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static unsigned long flags;
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#define FLAG_COUNT_BYTES 1
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#define FLAG_BREAK_SPACES 2
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#define FLAG_WIDTH 4
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/* Assuming the current column is COLUMN, return the column that
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printing C will move the cursor to.
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The first column is 0. */
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static int adjust_column(int column, char c)
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{
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if (!(flags & FLAG_COUNT_BYTES)) {
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if (c == '\b') {
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if (column > 0)
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column--;
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} else if (c == '\r')
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column = 0;
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else if (c == '\t')
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column = column + 8 - column % 8;
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else /* if (isprint (c)) */
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column++;
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} else
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column++;
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return column;
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}
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int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fold_main(int argc, char **argv)
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{
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char *line_out = NULL;
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int allocated_out = 0;
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char *w_opt;
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int width = 80;
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int i;
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int errs = 0;
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if (ENABLE_INCLUDE_SUSv2) {
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/* Turn any numeric options into -w options. */
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for (i = 1; i < argc; i++) {
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char const *a = argv[i];
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if (*a++ == '-') {
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if (*a == '-' && !a[1])
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break;
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if (isdigit(*a)) {
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argv[i] = xasprintf("-w%s", a);
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}
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}
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}
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}
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flags = getopt32(argv, "bsw:", &w_opt);
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if (flags & FLAG_WIDTH)
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width = xatoul_range(w_opt, 1, 10000);
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argv += optind;
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if (!*argv) {
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*--argv = (char*)"-";
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}
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do {
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FILE *istream = fopen_or_warn_stdin(*argv);
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int c;
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int column = 0; /* Screen column where next char will go. */
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int offset_out = 0; /* Index in `line_out' for next char. */
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if (istream == NULL) {
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errs |= EXIT_FAILURE;
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continue;
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}
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while ((c = getc(istream)) != EOF) {
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if (offset_out + 1 >= allocated_out) {
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allocated_out += 1024;
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line_out = xrealloc(line_out, allocated_out);
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}
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if (c == '\n') {
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line_out[offset_out++] = c;
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fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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column = offset_out = 0;
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continue;
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}
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rescan:
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column = adjust_column(column, c);
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if (column > width) {
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/* This character would make the line too long.
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Print the line plus a newline, and make this character
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start the next line. */
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if (flags & FLAG_BREAK_SPACES) {
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/* Look for the last blank. */
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int logical_end;
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for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
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if (isblank(line_out[logical_end])) {
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break;
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}
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}
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if (logical_end >= 0) {
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/* Found a blank. Don't output the part after it. */
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logical_end++;
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fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
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bb_putchar('\n');
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/* Move the remainder to the beginning of the next line.
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The areas being copied here might overlap. */
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memmove(line_out, line_out + logical_end, offset_out - logical_end);
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offset_out -= logical_end;
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for (column = i = 0; i < offset_out; i++) {
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column = adjust_column(column, line_out[i]);
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}
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goto rescan;
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}
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} else {
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if (offset_out == 0) {
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line_out[offset_out++] = c;
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continue;
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}
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}
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line_out[offset_out++] = '\n';
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fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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column = offset_out = 0;
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goto rescan;
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}
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line_out[offset_out++] = c;
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}
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if (offset_out) {
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fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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}
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if (ferror(istream) || fclose_if_not_stdin(istream)) {
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bb_simple_perror_msg(*argv); /* Avoid multibyte problems. */
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errs |= EXIT_FAILURE;
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}
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} while (*++argv);
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fflush_stdout_and_exit(errs);
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}
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