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    Annotation of /trunk/mkinitrd-magellan/klibc/usr/utils/mount_opts.c

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    Revision 815 - (hide annotations) (download)
    Fri Apr 24 18:32:46 2009 UTC (15 years, 1 month ago) by niro
    File MIME type: text/plain
    File size: 2108 byte(s) 
    -updated to klibc-1.5.15
    1 niro 532 /*
    2     * by rmk
    3     *
    4     * Decode mount options.
    5     */
    6     #include <sys/mount.h>
    7     #include <stdlib.h>
    8     #include <string.h>
    9    
    10     #include "mount_opts.h"
    11    
    12     #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
    13    
    14     static const struct mount_opts options[] = {
    15     /* name mask set noset */
    16     {"async", MS_SYNCHRONOUS, 0, MS_SYNCHRONOUS},
    17     {"atime", MS_NOATIME, 0, MS_NOATIME},
    18     {"bind", MS_TYPE, MS_BIND, 0,},
    19     {"dev", MS_NODEV, 0, MS_NODEV},
    20     {"diratime", MS_NODIRATIME, 0, MS_NODIRATIME},
    21     {"dirsync", MS_DIRSYNC, MS_DIRSYNC, 0},
    22     {"exec", MS_NOEXEC, 0, MS_NOEXEC},
    23     {"move", MS_TYPE, MS_MOVE, 0},
    24 niro 815 {"nodev", MS_NODEV, MS_NODEV, 0},
    25     {"noexec", MS_NOEXEC, MS_NOEXEC, 0},
    26     {"nosuid", MS_NOSUID, MS_NOSUID, 0},
    27 niro 532 {"recurse", MS_REC, MS_REC, 0},
    28     {"remount", MS_TYPE, MS_REMOUNT, 0},
    29     {"ro", MS_RDONLY, MS_RDONLY, 0},
    30     {"rw", MS_RDONLY, 0, MS_RDONLY},
    31     {"suid", MS_NOSUID, 0, MS_NOSUID},
    32     {"sync", MS_SYNCHRONOUS, MS_SYNCHRONOUS, 0},
    33     {"verbose", MS_VERBOSE, MS_VERBOSE, 0},
    34     };
    35    
    36     static void add_extra_option(struct extra_opts *extra, char *s)
    37     {
    38     int len = strlen(s);
    39     int newlen = extra->used_size + len;
    40    
    41     if (extra->str)
    42     len++; /* +1 for ',' */
    43    
    44     if (newlen >= extra->alloc_size) {
    45     char *new;
    46    
    47     new = realloc(extra->str, newlen + 1); /* +1 for NUL */
    48     if (!new)
    49     return;
    50    
    51     extra->str = new;
    52     extra->end = extra->str + extra->used_size;
    53     extra->alloc_size = newlen;
    54     }
    55    
    56     if (extra->used_size) {
    57     *extra->end = ',';
    58     extra->end++;
    59     }
    60     strcpy(extra->end, s);
    61     extra->used_size += len;
    62    
    63     }
    64    
    65     unsigned long
    66     parse_mount_options(char *arg, unsigned long rwflag, struct extra_opts *extra)
    67     {
    68     char *s;
    69    
    70     while ((s = strsep(&arg, ",")) != NULL) {
    71     char *opt = s;
    72     unsigned int i;
    73     int res, no = s[0] == 'n' && s[1] == 'o';
    74    
    75     if (no)
    76     s += 2;
    77    
    78     for (i = 0, res = 1; i < ARRAY_SIZE(options); i++) {
    79     res = strcmp(s, options[i].str);
    80    
    81     if (res == 0) {
    82     rwflag &= ~options[i].rwmask;
    83     if (no)
    84     rwflag |= options[i].rwnoset;
    85     else
    86     rwflag |= options[i].rwset;
    87     }
    88     if (res <= 0)
    89     break;
    90     }
    91    
    92     if (res != 0 && s[0])
    93     add_extra_option(extra, opt);
    94     }
    95    
    96     return rwflag;
    97     }