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    Contents of /tags/mkinitrd-6_1_8/busybox/coreutils/fold.c

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    Revision 916 - (show annotations) (download)
    Wed Oct 28 00:17:50 2009 UTC (14 years, 7 months ago) by niro
    File MIME type: text/plain
    File size: 3815 byte(s) 
    tagged 'mkinitrd-6_1_8'
    1 /* vi: set sw=4 ts=4: */
    2 /* fold -- wrap each input line to fit in specified width.
    3
    4 Written by David MacKenzie, djm@gnu.ai.mit.edu.
    5 Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
    6
    7 Modified for busybox based on coreutils v 5.0
    8 Copyright (C) 2003 Glenn McGrath
    9
    10 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    11 */
    12
    13 #include "libbb.h"
    14
    15 /* Must match getopt32 call */
    16 #define FLAG_COUNT_BYTES 1
    17 #define FLAG_BREAK_SPACES 2
    18 #define FLAG_WIDTH 4
    19
    20 /* Assuming the current column is COLUMN, return the column that
    21 printing C will move the cursor to.
    22 The first column is 0. */
    23 static int adjust_column(int column, char c)
    24 {
    25 if (!(option_mask32 & FLAG_COUNT_BYTES)) {
    26 if (c == '\b') {
    27 if (column > 0)
    28 column--;
    29 } else if (c == '\r')
    30 column = 0;
    31 else if (c == '\t')
    32 column = column + 8 - column % 8;
    33 else /* if (isprint (c)) */
    34 column++;
    35 } else
    36 column++;
    37 return column;
    38 }
    39
    40 int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    41 int fold_main(int argc, char **argv)
    42 {
    43 char *line_out = NULL;
    44 int allocated_out = 0;
    45 char *w_opt;
    46 int width = 80;
    47 int i;
    48 int errs = 0;
    49
    50 if (ENABLE_INCLUDE_SUSv2) {
    51 /* Turn any numeric options into -w options. */
    52 for (i = 1; i < argc; i++) {
    53 char const *a = argv[i];
    54
    55 if (*a++ == '-') {
    56 if (*a == '-' && !a[1]) /* "--" */
    57 break;
    58 if (isdigit(*a))
    59 argv[i] = xasprintf("-w%s", a);
    60 }
    61 }
    62 }
    63
    64 getopt32(argv, "bsw:", &w_opt);
    65 if (option_mask32 & FLAG_WIDTH)
    66 width = xatoul_range(w_opt, 1, 10000);
    67
    68 argv += optind;
    69 if (!*argv)
    70 *--argv = (char*)"-";
    71
    72 do {
    73 FILE *istream = fopen_or_warn_stdin(*argv);
    74 int c;
    75 int column = 0; /* Screen column where next char will go. */
    76 int offset_out = 0; /* Index in 'line_out' for next char. */
    77
    78 if (istream == NULL) {
    79 errs |= EXIT_FAILURE;
    80 continue;
    81 }
    82
    83 while ((c = getc(istream)) != EOF) {
    84 if (offset_out + 1 >= allocated_out) {
    85 allocated_out += 1024;
    86 line_out = xrealloc(line_out, allocated_out);
    87 }
    88
    89 if (c == '\n') {
    90 line_out[offset_out++] = c;
    91 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    92 column = offset_out = 0;
    93 continue;
    94 }
    95 rescan:
    96 column = adjust_column(column, c);
    97
    98 if (column > width) {
    99 /* This character would make the line too long.
    100 Print the line plus a newline, and make this character
    101 start the next line. */
    102 if (option_mask32 & FLAG_BREAK_SPACES) {
    103 /* Look for the last blank. */
    104 int logical_end;
    105
    106 for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
    107 if (isblank(line_out[logical_end])) {
    108 break;
    109 }
    110 }
    111 if (logical_end >= 0) {
    112 /* Found a blank. Don't output the part after it. */
    113 logical_end++;
    114 fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
    115 bb_putchar('\n');
    116 /* Move the remainder to the beginning of the next line.
    117 The areas being copied here might overlap. */
    118 memmove(line_out, line_out + logical_end, offset_out - logical_end);
    119 offset_out -= logical_end;
    120 for (column = i = 0; i < offset_out; i++) {
    121 column = adjust_column(column, line_out[i]);
    122 }
    123 goto rescan;
    124 }
    125 } else {
    126 if (offset_out == 0) {
    127 line_out[offset_out++] = c;
    128 continue;
    129 }
    130 }
    131 line_out[offset_out++] = '\n';
    132 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    133 column = offset_out = 0;
    134 goto rescan;
    135 }
    136
    137 line_out[offset_out++] = c;
    138 }
    139
    140 if (offset_out) {
    141 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    142 }
    143
    144 if (fclose_if_not_stdin(istream)) {
    145 bb_simple_perror_msg(*argv); /* Avoid multibyte problems. */
    146 errs |= EXIT_FAILURE;
    147 }
    148 } while (*++argv);
    149
    150 fflush_stdout_and_exit(errs);
    151 }