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
52 len = bb_mbstrlen(ptr_strbeg);
54 len = ptr - ptr_strbeg;
56 len = tab_size - (len % tab_size);
57 /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
58 printf("%s%*s", ptr_strbeg, len, "");
63 fputs(ptr_strbeg, stdout);
70 static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
74 while ((line = xmalloc_fgets(file)) != NULL) {
87 column += tab_size - (column % tab_size);
92 n = column / tab_size;
93 column = column % tab_size;
97 if ((opt & OPT_INITIAL) && ptr != line) {
98 printf("%*s%s", column, "", ptr);
101 n = strcspn(ptr, "\t ");
102 printf("%*s%.*s", column, "", n, ptr);
103 # if ENABLE_FEATURE_ASSUME_UNICODE
108 len = bb_mbstrlen(ptr);
115 column = (column + len) % tab_size;
122 int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
123 int expand_main(int argc UNUSED_PARAM, char **argv)
125 /* Default 8 spaces for 1 tab */
126 const char *opt_t = "8";
130 int exit_status = EXIT_SUCCESS;
132 #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
133 static const char expand_longopts[] ALIGN1 =
134 /* name, has_arg, val */
135 "initial\0" No_argument "i"
136 "tabs\0" Required_argument "t"
139 #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
140 static const char unexpand_longopts[] ALIGN1 =
141 /* name, has_arg, val */
142 "first-only\0" No_argument "i"
143 "tabs\0" Required_argument "t"
144 "all\0" No_argument "a"
149 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
150 IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
151 opt = getopt32(argv, "it:", &opt_t);
153 IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
154 /* -t NUM sets also -a */
155 opt_complementary = "ta";
156 opt = getopt32(argv, "ft:a", &opt_t);
157 /* -f --first-only is the default */
158 if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
160 tab_size = xatou_range(opt_t, 1, UINT_MAX);
165 *--argv = (char*)bb_msg_standard_input;
168 file = fopen_or_warn_stdin(*argv);
170 exit_status = EXIT_FAILURE;
174 if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
175 IF_EXPAND(expand(file, tab_size, opt));
177 IF_UNEXPAND(unexpand(file, tab_size, opt));
179 /* Check and close the file */
180 if (fclose_if_not_stdin(file)) {
181 bb_simple_perror_msg(*argv);
182 exit_status = EXIT_FAILURE;
184 /* If stdin also clear EOF */
189 /* Now close stdin also */
190 /* (if we didn't read from it, it's a no-op) */
192 bb_perror_msg_and_die(bb_msg_standard_input);
194 fflush_stdout_and_exit(exit_status);