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(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes text data bss dec hex filename 773469 1058 11092 785619 bfcd3 busybox_old 772644 1058 11092 784794 bf99a busybox_unstripped
210 lines
4.7 KiB
C
210 lines
4.7 KiB
C
/* expand - convert tabs to spaces
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* unexpand - convert spaces to tabs
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*
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* Copyright (C) 89, 91, 1995-2006 Free Software Foundation, Inc.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* David MacKenzie <djm@gnu.ai.mit.edu>
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*
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* Options for expand:
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* -t num --tabs=NUM Convert tabs to num spaces (default 8 spaces).
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* -i --initial Only convert initial tabs on each line to spaces.
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*
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* Options for unexpand:
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* -a --all Convert all blanks, instead of just initial blanks.
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* -f --first-only Convert only leading sequences of blanks (default).
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* -t num --tabs=NUM Have tabs num characters apart instead of 8.
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*
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* Busybox version (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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*
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* Caveat: this versions of expand and unexpand don't accept tab lists.
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*/
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#include "libbb.h"
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enum {
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OPT_INITIAL = 1 << 0,
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OPT_TABS = 1 << 1,
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OPT_ALL = 1 << 2,
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};
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static void xputchar(char c)
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{
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if (putchar(c) < 0)
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bb_error_msg_and_die(bb_msg_write_error);
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}
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#if ENABLE_EXPAND
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static void expand(FILE *file, unsigned tab_size, unsigned opt)
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{
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char *line;
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char *ptr;
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int convert;
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int pos;
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/* Increment tab_size by 1 locally.*/
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tab_size++;
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while ((line = xmalloc_fgets(file)) != NULL) {
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convert = 1;
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pos = 0;
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ptr = line;
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while (*line) {
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pos++;
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if (*line == '\t' && convert) {
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for (; pos < tab_size; pos++) {
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xputchar(' ');
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}
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} else {
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if ((opt & OPT_INITIAL) && !isblank(*line)) {
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convert = 0;
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}
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xputchar(*line);
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}
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if (pos == tab_size) {
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pos = 0;
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}
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line++;
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}
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free(ptr);
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}
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}
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#endif
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#if ENABLE_UNEXPAND
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static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
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{
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char *line;
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char *ptr;
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int convert;
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int pos;
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int i = 0;
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int column = 0;
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while ((line = xmalloc_fgets(file)) != NULL) {
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convert = 1;
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pos = 0;
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ptr = line;
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while (*line) {
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while ((*line == ' ' || *line == '\t') && convert) {
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pos += (*line == ' ') ? 1 : tab_size;
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line++;
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column++;
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if ((opt & OPT_ALL) && column == tab_size) {
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column = 0;
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goto put_tab;
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}
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}
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if (pos) {
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i = pos / tab_size;
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if (i) {
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for (; i > 0; i--) {
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put_tab:
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xputchar('\t');
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}
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} else {
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for (i = pos % tab_size; i > 0; i--) {
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xputchar(' ');
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}
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}
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pos = 0;
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} else {
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if (opt & OPT_INITIAL) {
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convert = 0;
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}
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if (opt & OPT_ALL) {
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column++;
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}
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xputchar(*line);
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line++;
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}
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}
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free(ptr);
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}
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}
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#endif
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int expand_main(int argc, char **argv);
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int expand_main(int argc, char **argv)
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{
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/* Default 8 spaces for 1 tab */
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const char *opt_t = "8";
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FILE *file;
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unsigned tab_size;
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unsigned opt;
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int exit_status = EXIT_SUCCESS;
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#if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
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static const char expand_longopts[] ALIGN1 =
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/* name, has_arg, val */
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"initial\0" No_argument "i"
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"tabs\0" Required_argument "t"
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;
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#endif
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#if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
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static const char unexpand_longopts[] ALIGN1 =
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/* name, has_arg, val */
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"first-only\0" No_argument "i"
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"tabs\0" Required_argument "t"
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"all\0" No_argument "a"
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;
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#endif
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if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
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USE_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
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opt = getopt32(argv, "it:", &opt_t);
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} else if (ENABLE_UNEXPAND) {
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USE_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
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/* -t NUM sets also -a */
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opt_complementary = "ta";
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opt = getopt32(argv, "ft:a", &opt_t);
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/* -f --first-only is the default */
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if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
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}
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tab_size = xatou_range(opt_t, 1, UINT_MAX);
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argv += optind;
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/* If no args are given, read from stdin */
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if (!*argv) {
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*--argv = (char*)bb_msg_standard_input;
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goto use_stdin;
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}
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do {
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if (NOT_LONE_CHAR(*argv, '-')) {
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file = fopen_or_warn(*argv, "r");
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if (!file) {
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exit_status = EXIT_FAILURE;
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continue;
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}
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} else {
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use_stdin:
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file = stdin;
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}
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if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
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USE_EXPAND(expand(file, tab_size, opt));
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else if (ENABLE_UNEXPAND)
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USE_UNEXPAND(unexpand(file, tab_size, opt));
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/* Check and close the file */
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/* We do want all of them to execute, thus | instead of || */
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if (ferror(file) | fclose_if_not_stdin(file)) {
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bb_perror_msg("%s", *argv);
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exit_status = EXIT_FAILURE;
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}
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/* If stdin also clear EOF */
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if (file == stdin)
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clearerr(file);
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} while (*++argv);
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/* Now close stdin also */
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/* (if we didn't read from it, it's a no-op) */
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if (fclose(stdin))
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bb_perror_msg_and_die(bb_msg_standard_input);
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fflush_stdout_and_exit(exit_status);
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}
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