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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/fold.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3765 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 <bug1@iinet.net.au>
    9
    10 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    11 */
    12
    13 #include "busybox.h"
    14
    15 static unsigned long flags;
    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
    24 static int adjust_column(int column, char c)
    25 {
    26 if (!(flags & FLAG_COUNT_BYTES)) {
    27 if (c == '\b') {
    28 if (column > 0)
    29 column--;
    30 } else if (c == '\r')
    31 column = 0;
    32 else if (c == '\t')
    33 column = column + 8 - column % 8;
    34 else /* if (isprint (c)) */
    35 column++;
    36 } else
    37 column++;
    38 return column;
    39 }
    40
    41 int fold_main(int argc, char **argv)
    42 {
    43 char *w_opt;
    44 int width = 80;
    45 int i;
    46 int errs = 0;
    47
    48 if (ENABLE_INCLUDE_SUSv2) {
    49 /* Turn any numeric options into -w options. */
    50 for (i = 1; i < argc; i++) {
    51 char const *a = argv[i];
    52
    53 if (*a++ == '-') {
    54 if (*a == '-' && !a[1])
    55 break;
    56 if (isdigit(*a)) {
    57 argv[i] = xasprintf("-w%s", a);
    58 }
    59 }
    60 }
    61 }
    62
    63 flags = getopt32(argc, argv, "bsw:", &w_opt);
    64 if (flags & FLAG_WIDTH)
    65 width = xatoul_range(w_opt, 1, 10000);
    66
    67 argv += optind;
    68 if (!*argv) {
    69 *--argv = "-";
    70 }
    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 static char *line_out = NULL;
    78 static int allocated_out = 0;
    79
    80 if (istream == NULL) {
    81 errs |= EXIT_FAILURE;
    82 continue;
    83 }
    84
    85 while ((c = getc(istream)) != EOF) {
    86 if (offset_out + 1 >= allocated_out) {
    87 allocated_out += 1024;
    88 line_out = xrealloc(line_out, allocated_out);
    89 }
    90
    91 if (c == '\n') {
    92 line_out[offset_out++] = c;
    93 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    94 column = offset_out = 0;
    95 continue;
    96 }
    97
    98 rescan:
    99 column = adjust_column(column, c);
    100
    101 if (column > width) {
    102 /* This character would make the line too long.
    103 Print the line plus a newline, and make this character
    104 start the next line. */
    105 if (flags & FLAG_BREAK_SPACES) {
    106 /* Look for the last blank. */
    107 int logical_end;
    108
    109 for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {
    110 if (isblank(line_out[logical_end])) {
    111 break;
    112 }
    113 }
    114 if (logical_end >= 0) {
    115 /* Found a blank. Don't output the part after it. */
    116 logical_end++;
    117 fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
    118 putchar('\n');
    119 /* Move the remainder to the beginning of the next line.
    120 The areas being copied here might overlap. */
    121 memmove(line_out, line_out + logical_end, offset_out - logical_end);
    122 offset_out -= logical_end;
    123 for (column = i = 0; i < offset_out; i++) {
    124 column = adjust_column(column, line_out[i]);
    125 }
    126 goto rescan;
    127 }
    128 } else {
    129 if (offset_out == 0) {
    130 line_out[offset_out++] = c;
    131 continue;
    132 }
    133 }
    134 line_out[offset_out++] = '\n';
    135 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    136 column = offset_out = 0;
    137 goto rescan;
    138 }
    139
    140 line_out[offset_out++] = c;
    141 }
    142
    143 if (offset_out) {
    144 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
    145 }
    146
    147 if (ferror(istream) || fclose_if_not_stdin(istream)) {
    148 bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
    149 errs |= EXIT_FAILURE;
    150 }
    151 } while (*++argv);
    152
    153 fflush_stdout_and_exit(errs);
    154 }