1 | /* fold -- wrap each input line to fit in specified width.
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2 |
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3 | Written by David MacKenzie, djm@gnu.ai.mit.edu.
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4 | Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
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5 |
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6 | Modified for busybox based on coreutils v 5.0
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7 | Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>
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8 |
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9 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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10 | */
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11 |
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12 | #include <ctype.h>
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13 | #include <errno.h>
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14 | #include <stdio.h>
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15 | #include <stdlib.h>
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16 | #include <string.h>
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17 | #include <sys/types.h>
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18 | #include <unistd.h>
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19 | #include "busybox.h"
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20 |
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21 | static unsigned long flags;
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22 | #define FLAG_COUNT_BYTES 1
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23 | #define FLAG_BREAK_SPACES 2
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24 | #define FLAG_WIDTH 4
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25 |
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26 | /* Assuming the current column is COLUMN, return the column that
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27 | printing C will move the cursor to.
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28 | The first column is 0. */
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29 |
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30 | static int adjust_column(int column, char c)
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31 | {
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32 | if (!(flags & FLAG_COUNT_BYTES)) {
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33 | if (c == '\b') {
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34 | if (column > 0)
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35 | column--;
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36 | } else if (c == '\r')
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37 | column = 0;
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38 | else if (c == '\t')
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39 | column = column + 8 - column % 8;
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40 | else /* if (isprint (c)) */
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41 | column++;
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42 | } else
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43 | column++;
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44 | return column;
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45 | }
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46 |
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47 | int fold_main(int argc, char **argv)
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48 | {
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49 | char *w_opt;
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50 | int width = 80;
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51 | int i;
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52 | int errs = 0;
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53 |
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54 | if(!ENABLE_DEBUG_YANK_SUSv2) {
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55 | /* Turn any numeric options into -w options. */
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56 | for (i = 1; i < argc; i++) {
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57 | char const *a = argv[i];
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58 |
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59 | if (*a++ == '-') {
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60 | if (*a == '-' && !a[1])
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61 | break;
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62 | if (isdigit(*a)) {
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63 | argv[i] = bb_xasprintf("-w%s", a);
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64 | }
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65 | }
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66 | }
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67 | }
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68 |
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69 | flags = bb_getopt_ulflags(argc, argv, "bsw:", &w_opt);
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70 | if (flags & FLAG_WIDTH)
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71 | width = bb_xgetlarg(w_opt, 10, 1, 10000);
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72 |
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73 | argv += optind;
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74 | if (!*argv) {
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75 | *--argv = "-";
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76 | }
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77 |
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78 | do {
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79 | FILE *istream = bb_wfopen_input(*argv);
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80 | int c;
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81 | int column = 0; /* Screen column where next char will go. */
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82 | int offset_out = 0; /* Index in `line_out' for next char. */
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83 | static char *line_out = NULL;
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84 | static int allocated_out = 0;
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85 |
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86 | if (istream == NULL) {
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87 | errs |= EXIT_FAILURE;
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88 | continue;
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89 | }
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90 |
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91 | while ((c = getc(istream)) != EOF) {
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92 | if (offset_out + 1 >= allocated_out) {
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93 | allocated_out += 1024;
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94 | line_out = xrealloc(line_out, allocated_out);
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95 | }
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96 |
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97 | if (c == '\n') {
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98 | line_out[offset_out++] = c;
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99 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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100 | column = offset_out = 0;
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101 | continue;
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102 | }
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103 |
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104 | rescan:
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105 | column = adjust_column(column, c);
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106 |
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107 | if (column > width) {
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108 | /* This character would make the line too long.
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109 | Print the line plus a newline, and make this character
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110 | start the next line. */
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111 | if (flags & FLAG_BREAK_SPACES) {
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112 | /* Look for the last blank. */
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113 | int logical_end;
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114 |
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115 | for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
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116 | if (isblank(line_out[logical_end])) {
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117 | break;
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118 | }
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119 | }
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120 | if (logical_end >= 0) {
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121 | /* Found a blank. Don't output the part after it. */
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122 | logical_end++;
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123 | fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
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124 | putchar('\n');
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125 | /* Move the remainder to the beginning of the next line.
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126 | The areas being copied here might overlap. */
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127 | memmove(line_out, line_out + logical_end, offset_out - logical_end);
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128 | offset_out -= logical_end;
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129 | for (column = i = 0; i < offset_out; i++) {
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130 | column = adjust_column(column, line_out[i]);
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131 | }
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132 | goto rescan;
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133 | }
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134 | } else {
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135 | if (offset_out == 0) {
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136 | line_out[offset_out++] = c;
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137 | continue;
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138 | }
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139 | }
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140 | line_out[offset_out++] = '\n';
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141 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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142 | column = offset_out = 0;
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143 | goto rescan;
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144 | }
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145 |
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146 | line_out[offset_out++] = c;
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147 | }
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148 |
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149 | if (offset_out) {
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150 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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151 | }
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152 |
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153 | if (ferror(istream) || bb_fclose_nonstdin(istream)) {
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154 | bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
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155 | errs |= EXIT_FAILURE;
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156 | }
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157 | } while (*++argv);
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158 |
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159 | bb_fflush_stdout_and_exit(errs);
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160 | }
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161 | /* vi: set sw=4 ts=4: */
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