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.
23 //config:config EXPAND
24 //config: bool "expand (5.8 kb)"
27 //config: By default, convert all tabs to spaces.
29 //config:config UNEXPAND
30 //config: bool "unexpand (6 kb)"
33 //config: By default, convert only leading sequences of blanks to tabs.
35 //applet:IF_EXPAND(APPLET(expand, BB_DIR_USR_BIN, BB_SUID_DROP))
36 // APPLET_ODDNAME:name main location suid_type help
37 //applet:IF_UNEXPAND(APPLET_ODDNAME(unexpand, expand, BB_DIR_USR_BIN, BB_SUID_DROP, unexpand))
39 //kbuild:lib-$(CONFIG_EXPAND) += expand.o
40 //kbuild:lib-$(CONFIG_UNEXPAND) += expand.o
42 //usage:#define expand_trivial_usage
43 //usage: "[-i] [-t N] [FILE]..."
44 //usage:#define expand_full_usage "\n\n"
45 //usage: "Convert tabs to spaces, writing to stdout\n"
46 //usage: "\n -i Don't convert tabs after non blanks"
47 //usage: "\n -t Tabstops every N chars"
49 //usage:#define unexpand_trivial_usage
50 //usage: "[-fa][-t N] [FILE]..."
51 //usage:#define unexpand_full_usage "\n\n"
52 //usage: "Convert spaces to tabs, writing to stdout\n"
53 //usage: "\n -a Convert all blanks"
54 //usage: "\n -f Convert only leading blanks"
55 //usage: "\n -t N Tabstops every N chars"
67 static void expand(FILE *file, unsigned tab_size, unsigned opt)
71 while ((line = xmalloc_fgets(file)) != NULL) {
76 ptr = ptr_strbeg = line;
77 while ((c = *ptr) != '\0') {
78 if ((opt & OPT_INITIAL) && !isblank(c)) {
79 /* not space or tab */
85 # if ENABLE_UNICODE_SUPPORT
86 len = unicode_strwidth(ptr_strbeg);
88 len = ptr - ptr_strbeg;
90 len = tab_size - (len % tab_size);
91 /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
92 printf("%s%*s", ptr_strbeg, len, "");
97 fputs(ptr_strbeg, stdout);
104 static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
108 while ((line = xmalloc_fgets(file)) != NULL) {
116 while (*ptr == ' ') {
122 column += tab_size - (column % tab_size);
127 n = column / tab_size;
129 len = column = column % tab_size;
134 if ((opt & OPT_INITIAL) && ptr != line) {
135 printf("%*s%s", len, "", ptr);
138 n = strcspn(ptr, "\t ");
139 printf("%*s%.*s", len, "", n, ptr);
140 # if ENABLE_UNICODE_SUPPORT
144 len = unicode_strwidth(ptr);
151 column = (column + len) % tab_size;
158 int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
159 int expand_main(int argc UNUSED_PARAM, char **argv)
161 /* Default 8 spaces for 1 tab */
162 const char *opt_t = "8";
166 int exit_status = EXIT_SUCCESS;
170 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
171 opt = getopt32long(argv, "it:",
172 "initial\0" No_argument "i"
173 "tabs\0" Required_argument "t"
177 opt = getopt32long(argv, "^"
180 "ta" /* -t NUM sets -a */,
181 "first-only\0" No_argument "i"
182 "tabs\0" Required_argument "t"
183 "all\0" No_argument "a"
186 /* -f --first-only is the default */
187 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
189 tab_size = xatou_range(opt_t, 1, UINT_MAX);
194 *--argv = (char*)bb_msg_standard_input;
197 file = fopen_or_warn_stdin(*argv);
199 exit_status = EXIT_FAILURE;
203 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
204 IF_EXPAND(expand(file, tab_size, opt));
206 IF_UNEXPAND(unexpand(file, tab_size, opt));
208 /* Check and close the file */
209 if (fclose_if_not_stdin(file)) {
210 bb_simple_perror_msg(*argv);
211 exit_status = EXIT_FAILURE;
213 /* If stdin also clear EOF */
218 /* Now close stdin also */
219 /* (if we didn't read from it, it's a no-op) */
221 bb_perror_msg_and_die(bb_msg_standard_input);
223 fflush_stdout_and_exit(exit_status);