[1765] | 1 | /* expand - convert tabs to spaces
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| 2 | * unexpand - convert spaces to tabs
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| 3 | *
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| 4 | * Copyright (C) 89, 91, 1995-2006 Free Software Foundation, Inc.
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| 5 | *
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[2725] | 6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 7 | *
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| 8 | * David MacKenzie <djm@gnu.ai.mit.edu>
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| 9 | *
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| 10 | * Options for expand:
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| 11 | * -t num --tabs=NUM Convert tabs to num spaces (default 8 spaces).
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| 12 | * -i --initial Only convert initial tabs on each line to spaces.
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| 13 | *
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| 14 | * Options for unexpand:
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| 15 | * -a --all Convert all blanks, instead of just initial blanks.
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| 16 | * -f --first-only Convert only leading sequences of blanks (default).
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| 17 | * -t num --tabs=NUM Have tabs num characters apart instead of 8.
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| 18 | *
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| 19 | * Busybox version (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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| 20 | *
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| 21 | * Caveat: this versions of expand and unexpand don't accept tab lists.
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| 22 | */
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[3232] | 23 |
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| 24 | //usage:#define expand_trivial_usage
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| 25 | //usage: "[-i] [-t N] [FILE]..."
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| 26 | //usage:#define expand_full_usage "\n\n"
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| 27 | //usage: "Convert tabs to spaces, writing to stdout\n"
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| 28 | //usage: IF_FEATURE_EXPAND_LONG_OPTIONS(
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| 29 | //usage: "\n -i,--initial Don't convert tabs after non blanks"
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| 30 | //usage: "\n -t,--tabs=N Tabstops every N chars"
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| 31 | //usage: )
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| 32 | //usage: IF_NOT_FEATURE_EXPAND_LONG_OPTIONS(
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| 33 | //usage: "\n -i Don't convert tabs after non blanks"
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| 34 | //usage: "\n -t Tabstops every N chars"
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| 35 | //usage: )
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| 36 |
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| 37 | //usage:#define unexpand_trivial_usage
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| 38 | //usage: "[-fa][-t N] [FILE]..."
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| 39 | //usage:#define unexpand_full_usage "\n\n"
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| 40 | //usage: "Convert spaces to tabs, writing to stdout\n"
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| 41 | //usage: IF_FEATURE_UNEXPAND_LONG_OPTIONS(
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| 42 | //usage: "\n -a,--all Convert all blanks"
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| 43 | //usage: "\n -f,--first-only Convert only leading blanks"
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| 44 | //usage: "\n -t,--tabs=N Tabstops every N chars"
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| 45 | //usage: )
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| 46 | //usage: IF_NOT_FEATURE_UNEXPAND_LONG_OPTIONS(
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| 47 | //usage: "\n -a Convert all blanks"
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| 48 | //usage: "\n -f Convert only leading blanks"
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| 49 | //usage: "\n -t N Tabstops every N chars"
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| 50 | //usage: )
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| 51 |
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[1765] | 52 | #include "libbb.h"
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[2725] | 53 | #include "unicode.h"
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[1765] | 54 |
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| 55 | enum {
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| 56 | OPT_INITIAL = 1 << 0,
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| 57 | OPT_TABS = 1 << 1,
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| 58 | OPT_ALL = 1 << 2,
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| 59 | };
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| 60 |
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| 61 | #if ENABLE_EXPAND
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| 62 | static void expand(FILE *file, unsigned tab_size, unsigned opt)
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| 63 | {
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| 64 | char *line;
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| 65 |
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[2725] | 66 | while ((line = xmalloc_fgets(file)) != NULL) {
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| 67 | unsigned char c;
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| 68 | char *ptr;
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| 69 | char *ptr_strbeg;
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[1765] | 70 |
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[2725] | 71 | ptr = ptr_strbeg = line;
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| 72 | while ((c = *ptr) != '\0') {
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| 73 | if ((opt & OPT_INITIAL) && !isblank(c)) {
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| 74 | /* not space or tab */
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| 75 | break;
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| 76 | }
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| 77 | if (c == '\t') {
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| 78 | unsigned len;
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| 79 | *ptr = '\0';
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| 80 | # if ENABLE_UNICODE_SUPPORT
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[3621] | 81 | len = unicode_strwidth(ptr_strbeg);
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[2725] | 82 | # else
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| 83 | len = ptr - ptr_strbeg;
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| 84 | # endif
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| 85 | len = tab_size - (len % tab_size);
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| 86 | /*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
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| 87 | printf("%s%*s", ptr_strbeg, len, "");
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| 88 | ptr_strbeg = ptr + 1;
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[1765] | 89 | }
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[2725] | 90 | ptr++;
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[1765] | 91 | }
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[2725] | 92 | fputs(ptr_strbeg, stdout);
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| 93 | free(line);
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[1765] | 94 | }
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| 95 | }
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| 96 | #endif
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| 97 |
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| 98 | #if ENABLE_UNEXPAND
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[2725] | 99 | static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
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[1765] | 100 | {
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| 101 | char *line;
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| 102 |
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| 103 | while ((line = xmalloc_fgets(file)) != NULL) {
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[2725] | 104 | char *ptr = line;
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| 105 | unsigned column = 0;
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| 106 |
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| 107 | while (*ptr) {
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| 108 | unsigned n;
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| 109 | unsigned len = 0;
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| 110 |
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| 111 | while (*ptr == ' ') {
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| 112 | ptr++;
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| 113 | len++;
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[1765] | 114 | }
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[2725] | 115 | column += len;
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| 116 | if (*ptr == '\t') {
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| 117 | column += tab_size - (column % tab_size);
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| 118 | ptr++;
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| 119 | continue;
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[1765] | 120 | }
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[2725] | 121 |
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| 122 | n = column / tab_size;
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| 123 | if (n) {
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| 124 | len = column = column % tab_size;
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| 125 | while (n--)
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| 126 | putchar('\t');
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| 127 | }
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| 128 |
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| 129 | if ((opt & OPT_INITIAL) && ptr != line) {
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| 130 | printf("%*s%s", len, "", ptr);
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| 131 | break;
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| 132 | }
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| 133 | n = strcspn(ptr, "\t ");
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| 134 | printf("%*s%.*s", len, "", n, ptr);
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| 135 | # if ENABLE_UNICODE_SUPPORT
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| 136 | {
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[3621] | 137 | char c = ptr[n];
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[2725] | 138 | ptr[n] = '\0';
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[3621] | 139 | len = unicode_strwidth(ptr);
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[2725] | 140 | ptr[n] = c;
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| 141 | }
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| 142 | # else
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| 143 | len = n;
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| 144 | # endif
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| 145 | ptr += n;
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| 146 | column = (column + len) % tab_size;
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[1765] | 147 | }
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[2725] | 148 | free(line);
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[1765] | 149 | }
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| 150 | }
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| 151 | #endif
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| 152 |
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[2725] | 153 | int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 154 | int expand_main(int argc UNUSED_PARAM, char **argv)
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[1765] | 155 | {
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| 156 | /* Default 8 spaces for 1 tab */
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| 157 | const char *opt_t = "8";
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| 158 | FILE *file;
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| 159 | unsigned tab_size;
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| 160 | unsigned opt;
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| 161 | int exit_status = EXIT_SUCCESS;
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| 162 |
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| 163 | #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
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| 164 | static const char expand_longopts[] ALIGN1 =
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| 165 | /* name, has_arg, val */
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| 166 | "initial\0" No_argument "i"
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| 167 | "tabs\0" Required_argument "t"
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| 168 | ;
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| 169 | #endif
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| 170 | #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
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| 171 | static const char unexpand_longopts[] ALIGN1 =
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| 172 | /* name, has_arg, val */
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| 173 | "first-only\0" No_argument "i"
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| 174 | "tabs\0" Required_argument "t"
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| 175 | "all\0" No_argument "a"
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| 176 | ;
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| 177 | #endif
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[2725] | 178 | init_unicode();
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[1765] | 179 |
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| 180 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
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[2725] | 181 | IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
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[1765] | 182 | opt = getopt32(argv, "it:", &opt_t);
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[2725] | 183 | } else {
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| 184 | IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
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[1765] | 185 | /* -t NUM sets also -a */
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| 186 | opt_complementary = "ta";
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| 187 | opt = getopt32(argv, "ft:a", &opt_t);
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| 188 | /* -f --first-only is the default */
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| 189 | if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
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| 190 | }
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| 191 | tab_size = xatou_range(opt_t, 1, UINT_MAX);
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| 192 |
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| 193 | argv += optind;
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| 194 |
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| 195 | if (!*argv) {
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| 196 | *--argv = (char*)bb_msg_standard_input;
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| 197 | }
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| 198 | do {
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[2725] | 199 | file = fopen_or_warn_stdin(*argv);
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| 200 | if (!file) {
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| 201 | exit_status = EXIT_FAILURE;
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| 202 | continue;
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[1765] | 203 | }
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| 204 |
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| 205 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
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[2725] | 206 | IF_EXPAND(expand(file, tab_size, opt));
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| 207 | else
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| 208 | IF_UNEXPAND(unexpand(file, tab_size, opt));
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[1765] | 209 |
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| 210 | /* Check and close the file */
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[2725] | 211 | if (fclose_if_not_stdin(file)) {
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| 212 | bb_simple_perror_msg(*argv);
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[1765] | 213 | exit_status = EXIT_FAILURE;
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| 214 | }
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| 215 | /* If stdin also clear EOF */
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| 216 | if (file == stdin)
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| 217 | clearerr(file);
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| 218 | } while (*++argv);
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| 219 |
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| 220 | /* Now close stdin also */
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| 221 | /* (if we didn't read from it, it's a no-op) */
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| 222 | if (fclose(stdin))
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| 223 | bb_perror_msg_and_die(bb_msg_standard_input);
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| 224 |
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| 225 | fflush_stdout_and_exit(exit_status);
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| 226 | }
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