[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /* fold -- wrap each input line to fit in specified width.
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| 3 |
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| 4 | Written by David MacKenzie, djm@gnu.ai.mit.edu.
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| 5 | Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
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| 6 |
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| 7 | Modified for busybox based on coreutils v 5.0
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| 8 | Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>
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| 9 |
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| 10 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 11 | */
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| 12 |
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[1765] | 13 | #include "libbb.h"
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[821] | 14 |
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| 15 | static unsigned long flags;
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| 16 | #define FLAG_COUNT_BYTES 1
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| 17 | #define FLAG_BREAK_SPACES 2
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| 18 | #define FLAG_WIDTH 4
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| 19 |
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| 20 | /* Assuming the current column is COLUMN, return the column that
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| 21 | printing C will move the cursor to.
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| 22 | The first column is 0. */
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| 23 |
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| 24 | static int adjust_column(int column, char c)
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| 25 | {
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| 26 | if (!(flags & FLAG_COUNT_BYTES)) {
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| 27 | if (c == '\b') {
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| 28 | if (column > 0)
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| 29 | column--;
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| 30 | } else if (c == '\r')
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| 31 | column = 0;
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| 32 | else if (c == '\t')
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| 33 | column = column + 8 - column % 8;
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| 34 | else /* if (isprint (c)) */
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| 35 | column++;
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| 36 | } else
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| 37 | column++;
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| 38 | return column;
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| 39 | }
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| 40 |
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[1765] | 41 | int fold_main(int argc, char **argv);
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[821] | 42 | int fold_main(int argc, char **argv)
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| 43 | {
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[1765] | 44 | char *line_out = NULL;
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| 45 | int allocated_out = 0;
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[821] | 46 | char *w_opt;
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| 47 | int width = 80;
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| 48 | int i;
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| 49 | int errs = 0;
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| 50 |
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[1765] | 51 | if (ENABLE_INCLUDE_SUSv2) {
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[821] | 52 | /* Turn any numeric options into -w options. */
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| 53 | for (i = 1; i < argc; i++) {
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| 54 | char const *a = argv[i];
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| 55 |
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| 56 | if (*a++ == '-') {
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| 57 | if (*a == '-' && !a[1])
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| 58 | break;
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| 59 | if (isdigit(*a)) {
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[1765] | 60 | argv[i] = xasprintf("-w%s", a);
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[821] | 61 | }
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| 62 | }
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| 63 | }
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| 64 | }
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| 65 |
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[1765] | 66 | flags = getopt32(argv, "bsw:", &w_opt);
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[821] | 67 | if (flags & FLAG_WIDTH)
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[1765] | 68 | width = xatoul_range(w_opt, 1, 10000);
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[821] | 69 |
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| 70 | argv += optind;
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| 71 | if (!*argv) {
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[1765] | 72 | *--argv = (char*)"-";
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[821] | 73 | }
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| 74 |
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| 75 | do {
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[1765] | 76 | FILE *istream = fopen_or_warn_stdin(*argv);
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[821] | 77 | int c;
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| 78 | int column = 0; /* Screen column where next char will go. */
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| 79 | int offset_out = 0; /* Index in `line_out' for next char. */
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| 80 |
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| 81 | if (istream == NULL) {
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| 82 | errs |= EXIT_FAILURE;
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| 83 | continue;
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| 84 | }
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| 85 |
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| 86 | while ((c = getc(istream)) != EOF) {
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| 87 | if (offset_out + 1 >= allocated_out) {
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| 88 | allocated_out += 1024;
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| 89 | line_out = xrealloc(line_out, allocated_out);
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| 90 | }
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| 91 |
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| 92 | if (c == '\n') {
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| 93 | line_out[offset_out++] = c;
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| 94 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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| 95 | column = offset_out = 0;
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| 96 | continue;
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| 97 | }
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[1765] | 98 | rescan:
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[821] | 99 | column = adjust_column(column, c);
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| 100 |
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| 101 | if (column > width) {
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| 102 | /* This character would make the line too long.
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| 103 | Print the line plus a newline, and make this character
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| 104 | start the next line. */
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| 105 | if (flags & FLAG_BREAK_SPACES) {
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| 106 | /* Look for the last blank. */
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| 107 | int logical_end;
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| 108 |
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| 109 | for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
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| 110 | if (isblank(line_out[logical_end])) {
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| 111 | break;
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| 112 | }
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| 113 | }
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| 114 | if (logical_end >= 0) {
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| 115 | /* Found a blank. Don't output the part after it. */
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| 116 | logical_end++;
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| 117 | fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
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| 118 | putchar('\n');
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| 119 | /* Move the remainder to the beginning of the next line.
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| 120 | The areas being copied here might overlap. */
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| 121 | memmove(line_out, line_out + logical_end, offset_out - logical_end);
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| 122 | offset_out -= logical_end;
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| 123 | for (column = i = 0; i < offset_out; i++) {
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| 124 | column = adjust_column(column, line_out[i]);
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| 125 | }
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| 126 | goto rescan;
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| 127 | }
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| 128 | } else {
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| 129 | if (offset_out == 0) {
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| 130 | line_out[offset_out++] = c;
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| 131 | continue;
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| 132 | }
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| 133 | }
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| 134 | line_out[offset_out++] = '\n';
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| 135 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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| 136 | column = offset_out = 0;
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| 137 | goto rescan;
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| 138 | }
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| 139 |
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| 140 | line_out[offset_out++] = c;
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| 141 | }
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| 142 |
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| 143 | if (offset_out) {
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| 144 | fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
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| 145 | }
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| 146 |
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[1765] | 147 | if (ferror(istream) || fclose_if_not_stdin(istream)) {
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[821] | 148 | bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
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| 149 | errs |= EXIT_FAILURE;
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| 150 | }
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| 151 | } while (*++argv);
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| 152 |
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[1765] | 153 | fflush_stdout_and_exit(errs);
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[821] | 154 | }
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