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 source tree.
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.
24 //usage:#define expand_trivial_usage
25 //usage: "[-i] [-t N] [FILE]..."
26 //usage:#define expand_full_usage "\n\n"
27 //usage: "Convert tabs to spaces, writing to stdout\n"
29 //usage: IF_FEATURE_EXPAND_LONG_OPTIONS(
30 //usage: "\n -i,--initial Don't convert tabs after non blanks"
31 //usage: "\n -t,--tabs=N Tabstops every N chars"
33 //usage: IF_NOT_FEATURE_EXPAND_LONG_OPTIONS(
34 //usage: "\n -i Don't convert tabs after non blanks"
35 //usage: "\n -t Tabstops every N chars"
38 //usage:#define unexpand_trivial_usage
39 //usage: "[-fa][-t N] [FILE]..."
40 //usage:#define unexpand_full_usage "\n\n"
41 //usage: "Convert spaces to tabs, writing to stdout\n"
43 //usage: IF_FEATURE_UNEXPAND_LONG_OPTIONS(
44 //usage: "\n -a,--all Convert all blanks"
45 //usage: "\n -f,--first-only Convert only leading blanks"
46 //usage: "\n -t,--tabs=N Tabstops every N chars"
48 //usage: IF_NOT_FEATURE_UNEXPAND_LONG_OPTIONS(
49 //usage: "\n -a Convert all blanks"
50 //usage: "\n -f Convert only leading blanks"
51 //usage: "\n -t N Tabstops every N chars"
64 static void expand(FILE *file, unsigned tab_size, unsigned opt)
68 while ((line = xmalloc_fgets(file)) != NULL) {
73 ptr = ptr_strbeg = line;
74 while ((c = *ptr) != '\0') {
75 if ((opt & OPT_INITIAL) && !isblank(c)) {
76 /* not space or tab */
82 # if ENABLE_UNICODE_SUPPORT
85 printable_string(&uni_stat, ptr_strbeg);
86 len = uni_stat.unicode_width;
89 len = ptr - ptr_strbeg;
91 len = tab_size - (len % tab_size);
92 /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
93 printf("%s%*s", ptr_strbeg, len, "");
98 fputs(ptr_strbeg, stdout);
105 static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
109 while ((line = xmalloc_fgets(file)) != NULL) {
117 while (*ptr == ' ') {
123 column += tab_size - (column % tab_size);
128 n = column / tab_size;
130 len = column = column % tab_size;
135 if ((opt & OPT_INITIAL) && ptr != line) {
136 printf("%*s%s", len, "", ptr);
139 n = strcspn(ptr, "\t ");
140 printf("%*s%.*s", len, "", n, ptr);
141 # if ENABLE_UNICODE_SUPPORT
147 printable_string(&uni_stat, ptr);
148 len = uni_stat.unicode_width;
155 column = (column + len) % tab_size;
162 int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
163 int expand_main(int argc UNUSED_PARAM, char **argv)
165 /* Default 8 spaces for 1 tab */
166 const char *opt_t = "8";
170 int exit_status = EXIT_SUCCESS;
172 #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
173 static const char expand_longopts[] ALIGN1 =
174 /* name, has_arg, val */
175 "initial\0" No_argument "i"
176 "tabs\0" Required_argument "t"
179 #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
180 static const char unexpand_longopts[] ALIGN1 =
181 /* name, has_arg, val */
182 "first-only\0" No_argument "i"
183 "tabs\0" Required_argument "t"
184 "all\0" No_argument "a"
189 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
190 IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
191 opt = getopt32(argv, "it:", &opt_t);
193 IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
194 /* -t NUM sets also -a */
195 opt_complementary = "ta";
196 opt = getopt32(argv, "ft:a", &opt_t);
197 /* -f --first-only is the default */
198 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
200 tab_size = xatou_range(opt_t, 1, UINT_MAX);
205 *--argv = (char*)bb_msg_standard_input;
208 file = fopen_or_warn_stdin(*argv);
210 exit_status = EXIT_FAILURE;
214 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
215 IF_EXPAND(expand(file, tab_size, opt));
217 IF_UNEXPAND(unexpand(file, tab_size, opt));
219 /* Check and close the file */
220 if (fclose_if_not_stdin(file)) {
221 bb_simple_perror_msg(*argv);
222 exit_status = EXIT_FAILURE;
224 /* If stdin also clear EOF */
229 /* Now close stdin also */
230 /* (if we didn't read from it, it's a no-op) */
232 bb_perror_msg_and_die(bb_msg_standard_input);
234 fflush_stdout_and_exit(exit_status);