fold: unicode support. Based on a patch by Tomas Heinrich <heinrich.tomas@gmail.com>
General Unicode support is tweaked to expose unicode_status. function old new delta init_unicode - 77 +77 write2stdout - 19 +19 adjust_column 68 71 +3 unicode_status - 1 +1 unicode_is_enabled 1 - -1 grep_main 780 773 -7 fold_main 619 552 -67 check_unicode_in_env 77 - -77 ------------------------------------------------------------------------------ (add/remove: 3/2 grow/shrink: 1/2 up/down: 100/-152) Total: -52 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
165
coreutils/fold.c
165
coreutils/fold.c
@@ -9,8 +9,8 @@
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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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#include "unicode.h"
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/* Must match getopt32 call */
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#define FLAG_COUNT_BYTES 1
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@@ -20,39 +20,53 @@
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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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static int adjust_column(unsigned column, char c)
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{
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if (!(option_mask32 & 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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if (option_mask32 & FLAG_COUNT_BYTES)
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return ++column;
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if (c == '\t')
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return column + 8 - column % 8;
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if (c == '\b') {
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if ((int)--column < 0)
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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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}
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else if (c == '\r')
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column = 0;
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else { /* just a printable char */
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if (unicode_status != UNICODE_ON /* every byte is a new char */
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|| (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */
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) {
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column++;
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} else
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column++;
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}
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}
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return column;
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}
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/* Note that this function can write NULs, unlike fputs etc. */
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static void write2stdout(const void *buf, unsigned size)
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{
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fwrite(buf, 1, size, stdout);
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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 UNUSED_PARAM, 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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const char *w_opt = "80";
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unsigned width;
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smallint exitcode = EXIT_SUCCESS;
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init_unicode();
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if (ENABLE_INCLUDE_SUSv2) {
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/* Turn any numeric options into -w options. */
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int i;
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for (i = 1; argv[i]; i++) {
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char const *a = argv[i];
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if (*a++ == '-') {
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const char *a = argv[i];
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if (*a == '-') {
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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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@@ -62,8 +76,7 @@ int fold_main(int argc UNUSED_PARAM, char **argv)
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}
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getopt32(argv, "bsw:", &w_opt);
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if (option_mask32 & FLAG_WIDTH)
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width = xatoul_range(w_opt, 1, 10000);
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width = xatou_range(w_opt, 1, 10000);
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argv += optind;
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if (!*argv)
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@@ -72,79 +85,81 @@ int fold_main(int argc UNUSED_PARAM, char **argv)
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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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unsigned column = 0; /* Screen column where next char will go */
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unsigned 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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exitcode = 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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/* We grow line_out in chunks of 0x1000 bytes */
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if ((offset_out & 0xfff) == 0) {
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line_out = xrealloc(line_out, offset_out + 0x1000);
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}
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rescan:
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line_out[offset_out] = c;
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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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write2stdout(line_out, offset_out + 1);
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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 (option_mask32 & 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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}
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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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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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if (column <= width || offset_out == 0) {
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/* offset_out == 0 case happens
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* with small width (say, 1) and tabs.
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* The very first tab already goes to column 8,
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* but we must not wrap it */
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offset_out++;
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continue;
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}
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line_out[offset_out++] = c;
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}
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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 (option_mask32 & FLAG_BREAK_SPACES) {
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unsigned i;
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unsigned logical_end;
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/* Look for the last blank. */
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for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) {
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if (!isblank(line_out[logical_end]))
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continue;
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/* Found a space or tab.
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* Output up to and including it, and start a new line */
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logical_end++;
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/*line_out[logical_end] = '\n'; - NO! this nukes one buffered character */
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write2stdout(line_out, logical_end);
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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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/* No blank found, wrap will split the overlong word */
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}
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/* Output what we accumulated up to now, and start a new line */
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line_out[offset_out] = '\n';
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write2stdout(line_out, offset_out + 1);
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column = offset_out = 0;
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goto rescan;
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} /* while (not EOF) */
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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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write2stdout(line_out, offset_out);
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}
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if (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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bb_simple_perror_msg(*argv);
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exitcode = 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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fflush_stdout_and_exit(exitcode);
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}
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