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.
33 static void expand(FILE *file, unsigned tab_size, unsigned opt)
37 while ((line = xmalloc_fgets(file)) != NULL) {
42 ptr = ptr_strbeg = line;
43 while ((c = *ptr) != '\0') {
44 if ((opt & OPT_INITIAL) && !isblank(c)) {
45 /* not space or tab */
51 # if ENABLE_FEATURE_ASSUME_UNICODE
54 printable_string(&uni_stat, ptr_strbeg);
55 len = uni_stat.unicode_width;
58 len = ptr - ptr_strbeg;
60 len = tab_size - (len % tab_size);
61 /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
62 printf("%s%*s", ptr_strbeg, len, "");
67 fputs(ptr_strbeg, stdout);
74 static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
78 while ((line = xmalloc_fgets(file)) != NULL) {
91 column += tab_size - (column % tab_size);
96 n = column / tab_size;
97 column = column % tab_size;
101 if ((opt & OPT_INITIAL) && ptr != line) {
102 printf("%*s%s", column, "", ptr);
105 n = strcspn(ptr, "\t ");
106 printf("%*s%.*s", column, "", n, ptr);
107 # if ENABLE_FEATURE_ASSUME_UNICODE
113 printable_string(&uni_stat, ptr);
114 len = uni_stat.unicode_width;
121 column = (column + len) % tab_size;
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"
155 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
156 IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
157 opt = getopt32(argv, "it:", &opt_t);
159 IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
160 /* -t NUM sets also -a */
161 opt_complementary = "ta";
162 opt = getopt32(argv, "ft:a", &opt_t);
163 /* -f --first-only is the default */
164 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
166 tab_size = xatou_range(opt_t, 1, UINT_MAX);
171 *--argv = (char*)bb_msg_standard_input;
174 file = fopen_or_warn_stdin(*argv);
176 exit_status = EXIT_FAILURE;
180 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
181 IF_EXPAND(expand(file, tab_size, opt));
183 IF_UNEXPAND(unexpand(file, tab_size, opt));
185 /* Check and close the file */
186 if (fclose_if_not_stdin(file)) {
187 bb_simple_perror_msg(*argv);
188 exit_status = EXIT_FAILURE;
190 /* If stdin also clear EOF */
195 /* Now close stdin also */
196 /* (if we didn't read from it, it's a no-op) */
198 bb_perror_msg_and_die(bb_msg_standard_input);
200 fflush_stdout_and_exit(exit_status);