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"
28 //usage: IF_FEATURE_EXPAND_LONG_OPTIONS(
29 //usage: "\n -i,--initial Don't convert tabs after non blanks"
30 //usage: "\n -t,--tabs=N Tabstops every N chars"
32 //usage: IF_NOT_FEATURE_EXPAND_LONG_OPTIONS(
33 //usage: "\n -i Don't convert tabs after non blanks"
34 //usage: "\n -t Tabstops every N chars"
37 //usage:#define unexpand_trivial_usage
38 //usage: "[-fa][-t N] [FILE]..."
39 //usage:#define unexpand_full_usage "\n\n"
40 //usage: "Convert spaces to tabs, writing to stdout\n"
41 //usage: IF_FEATURE_UNEXPAND_LONG_OPTIONS(
42 //usage: "\n -a,--all Convert all blanks"
43 //usage: "\n -f,--first-only Convert only leading blanks"
44 //usage: "\n -t,--tabs=N Tabstops every N chars"
46 //usage: IF_NOT_FEATURE_UNEXPAND_LONG_OPTIONS(
47 //usage: "\n -a Convert all blanks"
48 //usage: "\n -f Convert only leading blanks"
49 //usage: "\n -t N Tabstops every N chars"
62 static void expand(FILE *file, unsigned tab_size, unsigned opt)
66 while ((line = xmalloc_fgets(file)) != NULL) {
71 ptr = ptr_strbeg = line;
72 while ((c = *ptr) != '\0') {
73 if ((opt & OPT_INITIAL) && !isblank(c)) {
74 /* not space or tab */
80 # if ENABLE_UNICODE_SUPPORT
81 len = unicode_strwidth(ptr_strbeg);
83 len = ptr - ptr_strbeg;
85 len = tab_size - (len % tab_size);
86 /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
87 printf("%s%*s", ptr_strbeg, len, "");
92 fputs(ptr_strbeg, stdout);
99 static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
103 while ((line = xmalloc_fgets(file)) != NULL) {
111 while (*ptr == ' ') {
117 column += tab_size - (column % tab_size);
122 n = column / tab_size;
124 len = column = column % tab_size;
129 if ((opt & OPT_INITIAL) && ptr != line) {
130 printf("%*s%s", len, "", ptr);
133 n = strcspn(ptr, "\t ");
134 printf("%*s%.*s", len, "", n, ptr);
135 # if ENABLE_UNICODE_SUPPORT
139 len = unicode_strwidth(ptr);
146 column = (column + len) % tab_size;
153 int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
154 int expand_main(int argc UNUSED_PARAM, char **argv)
156 /* Default 8 spaces for 1 tab */
157 const char *opt_t = "8";
161 int exit_status = EXIT_SUCCESS;
163 #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
164 static const char expand_longopts[] ALIGN1 =
165 /* name, has_arg, val */
166 "initial\0" No_argument "i"
167 "tabs\0" Required_argument "t"
170 #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
171 static const char unexpand_longopts[] ALIGN1 =
172 /* name, has_arg, val */
173 "first-only\0" No_argument "i"
174 "tabs\0" Required_argument "t"
175 "all\0" No_argument "a"
180 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
181 IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
182 opt = getopt32(argv, "it:", &opt_t);
184 IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
185 /* -t NUM sets also -a */
186 opt_complementary = "ta";
187 opt = getopt32(argv, "ft:a", &opt_t);
188 /* -f --first-only is the default */
189 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
191 tab_size = xatou_range(opt_t, 1, UINT_MAX);
196 *--argv = (char*)bb_msg_standard_input;
199 file = fopen_or_warn_stdin(*argv);
201 exit_status = EXIT_FAILURE;
205 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
206 IF_EXPAND(expand(file, tab_size, opt));
208 IF_UNEXPAND(unexpand(file, tab_size, opt));
210 /* Check and close the file */
211 if (fclose_if_not_stdin(file)) {
212 bb_simple_perror_msg(*argv);
213 exit_status = EXIT_FAILURE;
215 /* If stdin also clear EOF */
220 /* Now close stdin also */
221 /* (if we didn't read from it, it's a no-op) */
223 bb_perror_msg_and_die(bb_msg_standard_input);
225 fflush_stdout_and_exit(exit_status);