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    Annotation of /tags/mkinitrd-6_3_0/busybox/coreutils/fold.c

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    Revision 532 - (hide annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    Original Path: trunk/mkinitrd-magellan/busybox/coreutils/fold.c
    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 niro 532 /* 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     }