[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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| 6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 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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| 23 |
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| 24 | #include "libbb.h"
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| 25 |
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| 26 | enum {
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| 27 | OPT_INITIAL = 1 << 0,
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| 28 | OPT_TABS = 1 << 1,
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| 29 | OPT_ALL = 1 << 2,
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| 30 | };
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| 31 |
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| 32 | static void xputchar(char c)
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| 33 | {
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| 34 | if (putchar(c) < 0)
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| 35 | bb_error_msg_and_die(bb_msg_write_error);
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| 36 | }
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| 37 |
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| 38 | #if ENABLE_EXPAND
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| 39 | static void expand(FILE *file, unsigned tab_size, unsigned opt)
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| 40 | {
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| 41 | char *line;
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| 42 | char *ptr;
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| 43 | int convert;
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| 44 | int pos;
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| 45 |
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| 46 | /* Increment tab_size by 1 locally.*/
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| 47 | tab_size++;
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| 48 |
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| 49 | while ((line = xmalloc_fgets(file)) != NULL) {
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| 50 | convert = 1;
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| 51 | pos = 0;
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| 52 | ptr = line;
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| 53 | while (*line) {
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| 54 | pos++;
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| 55 | if (*line == '\t' && convert) {
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| 56 | for (; pos < tab_size; pos++) {
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| 57 | xputchar(' ');
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| 58 | }
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| 59 | } else {
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| 60 | if ((opt & OPT_INITIAL) && !isblank(*line)) {
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| 61 | convert = 0;
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| 62 | }
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| 63 | xputchar(*line);
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| 64 | }
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| 65 | if (pos == tab_size) {
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| 66 | pos = 0;
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| 67 | }
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| 68 | line++;
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| 69 | }
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| 70 | free(ptr);
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| 71 | }
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| 72 | }
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| 73 | #endif
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| 74 |
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| 75 | #if ENABLE_UNEXPAND
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| 76 | static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
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| 77 | {
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| 78 | char *line;
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| 79 | char *ptr;
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| 80 | int convert;
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| 81 | int pos;
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| 82 | int i = 0;
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| 83 | int column = 0;
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| 84 |
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| 85 | while ((line = xmalloc_fgets(file)) != NULL) {
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| 86 | convert = 1;
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| 87 | pos = 0;
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| 88 | ptr = line;
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| 89 | while (*line) {
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| 90 | while ((*line == ' ' || *line == '\t') && convert) {
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| 91 | pos += (*line == ' ') ? 1 : tab_size;
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| 92 | line++;
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| 93 | column++;
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| 94 | if ((opt & OPT_ALL) && column == tab_size) {
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| 95 | column = 0;
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| 96 | goto put_tab;
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| 97 | }
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| 98 | }
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| 99 | if (pos) {
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| 100 | i = pos / tab_size;
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| 101 | if (i) {
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| 102 | for (; i > 0; i--) {
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| 103 | put_tab:
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| 104 | xputchar('\t');
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| 105 | }
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| 106 | } else {
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| 107 | for (i = pos % tab_size; i > 0; i--) {
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| 108 | xputchar(' ');
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| 109 | }
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| 110 | }
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| 111 | pos = 0;
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| 112 | } else {
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| 113 | if (opt & OPT_INITIAL) {
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| 114 | convert = 0;
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| 115 | }
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| 116 | if (opt & OPT_ALL) {
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| 117 | column++;
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| 118 | }
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| 119 | xputchar(*line);
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| 120 | line++;
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| 121 | }
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| 122 | }
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| 123 | free(ptr);
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| 124 | }
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| 125 | }
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| 126 | #endif
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| 127 |
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| 128 | int expand_main(int argc, char **argv);
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| 129 | int expand_main(int argc, char **argv)
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| 130 | {
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| 131 | /* Default 8 spaces for 1 tab */
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| 132 | const char *opt_t = "8";
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| 133 | FILE *file;
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| 134 | unsigned tab_size;
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| 135 | unsigned opt;
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| 136 | int exit_status = EXIT_SUCCESS;
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| 137 |
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| 138 | #if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
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| 139 | static const char expand_longopts[] ALIGN1 =
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| 140 | /* name, has_arg, val */
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| 141 | "initial\0" No_argument "i"
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| 142 | "tabs\0" Required_argument "t"
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| 143 | ;
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| 144 | #endif
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| 145 | #if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
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| 146 | static const char unexpand_longopts[] ALIGN1 =
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| 147 | /* name, has_arg, val */
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| 148 | "first-only\0" No_argument "i"
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| 149 | "tabs\0" Required_argument "t"
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| 150 | "all\0" No_argument "a"
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| 151 | ;
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| 152 | #endif
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| 153 |
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| 154 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
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| 155 | USE_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
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| 156 | opt = getopt32(argv, "it:", &opt_t);
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| 157 | } else if (ENABLE_UNEXPAND) {
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| 158 | USE_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
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| 159 | /* -t NUM sets also -a */
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| 160 | opt_complementary = "ta";
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| 161 | opt = getopt32(argv, "ft:a", &opt_t);
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| 162 | /* -f --first-only is the default */
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| 163 | if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
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| 164 | }
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| 165 | tab_size = xatou_range(opt_t, 1, UINT_MAX);
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| 166 |
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| 167 | argv += optind;
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| 168 |
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| 169 | /* If no args are given, read from stdin */
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| 170 | if (!*argv) {
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| 171 | *--argv = (char*)bb_msg_standard_input;
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| 172 | goto use_stdin;
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| 173 | }
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| 174 |
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| 175 | do {
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| 176 | if (NOT_LONE_CHAR(*argv, '-')) {
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| 177 | file = fopen_or_warn(*argv, "r");
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| 178 | if (!file) {
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| 179 | exit_status = EXIT_FAILURE;
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| 180 | continue;
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| 181 | }
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| 182 | } else {
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| 183 | use_stdin:
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| 184 | file = stdin;
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| 185 | }
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| 186 |
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| 187 | if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
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| 188 | USE_EXPAND(expand(file, tab_size, opt));
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| 189 | else if (ENABLE_UNEXPAND)
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| 190 | USE_UNEXPAND(unexpand(file, tab_size, opt));
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| 191 |
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| 192 | /* Check and close the file */
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| 193 | /* We do want all of them to execute, thus | instead of || */
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| 194 | if (ferror(file) | fclose_if_not_stdin(file)) {
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| 195 | bb_perror_msg("%s", *argv);
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| 196 | exit_status = EXIT_FAILURE;
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| 197 | }
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| 198 | /* If stdin also clear EOF */
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| 199 | if (file == stdin)
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| 200 | clearerr(file);
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| 201 | } while (*++argv);
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| 202 |
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| 203 | /* Now close stdin also */
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| 204 | /* (if we didn't read from it, it's a no-op) */
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| 205 | if (fclose(stdin))
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| 206 | bb_perror_msg_and_die(bb_msg_standard_input);
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| 207 |
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| 208 | fflush_stdout_and_exit(exit_status);
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| 209 | }
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