1 /* expand - convert tabs to spaces
2 * unexpand - convert spaces to tabs
4 * Copyright (C) 89, 91, 1995-2006 Free Software Foundation, Inc.
6 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 * David MacKenzie <djm@gnu.ai.mit.edu>
11 * -t num --tabs=NUM Convert tabs to num spaces (default 8 spaces).
12 * -i --initial Only convert initial tabs on each line to spaces.
14 * Options for unexpand:
15 * -a --all Convert all blanks, instead of just initial blanks.
16 * -f --first-only Convert only leading sequences of blanks (default).
17 * -t num --tabs=NUM Have tabs num characters apart instead of 8.
19 * Busybox version (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
21 * Caveat: this versions of expand and unexpand don't accept tab lists.
32 static void xputchar(char c)
35 bb_error_msg_and_die(bb_msg_write_error);
39 static void expand(FILE *file, unsigned tab_size, unsigned opt)
46 /* Increment tab_size by 1 locally.*/
49 while ((line = xmalloc_fgets(file)) != NULL) {
55 if (*line == '\t' && convert) {
56 for (; pos < tab_size; pos++) {
60 if ((opt & OPT_INITIAL) && !isblank(*line)) {
65 if (pos == tab_size) {
76 static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
85 while ((line = xmalloc_fgets(file)) != NULL) {
90 while ((*line == ' ' || *line == '\t') && convert) {
91 pos += (*line == ' ') ? 1 : tab_size;
94 if ((opt & OPT_ALL) && column == tab_size) {
107 for (i = pos % tab_size; i > 0; i--) {
113 if (opt & OPT_INITIAL) {
128 int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
129 int expand_main(int argc UNUSED_PARAM, char **argv)
131 /* Default 8 spaces for 1 tab */
132 const char *opt_t = "8";
136 int exit_status = EXIT_SUCCESS;
138 #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
139 static const char expand_longopts[] ALIGN1 =
140 /* name, has_arg, val */
141 "initial\0" No_argument "i"
142 "tabs\0" Required_argument "t"
145 #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
146 static const char unexpand_longopts[] ALIGN1 =
147 /* name, has_arg, val */
148 "first-only\0" No_argument "i"
149 "tabs\0" Required_argument "t"
150 "all\0" No_argument "a"
154 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
155 USE_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
156 opt = getopt32(argv, "it:", &opt_t);
158 USE_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
159 /* -t NUM sets also -a */
160 opt_complementary = "ta";
161 opt = getopt32(argv, "ft:a", &opt_t);
162 /* -f --first-only is the default */
163 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
165 tab_size = xatou_range(opt_t, 1, UINT_MAX);
170 *--argv = (char*)bb_msg_standard_input;
173 file = fopen_or_warn_stdin(*argv);
175 exit_status = EXIT_FAILURE;
179 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
180 USE_EXPAND(expand(file, tab_size, opt));
182 USE_UNEXPAND(unexpand(file, tab_size, opt));
184 /* Check and close the file */
185 if (fclose_if_not_stdin(file)) {
186 bb_simple_perror_msg(*argv);
187 exit_status = EXIT_FAILURE;
189 /* If stdin also clear EOF */
194 /* Now close stdin also */
195 /* (if we didn't read from it, it's a no-op) */
197 bb_perror_msg_and_die(bb_msg_standard_input);
199 fflush_stdout_and_exit(exit_status);