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#define FAT_DENTRY_UNUSED   0x00
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#define FAT_DENTRY_UNUSED   0x00
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#define FAT_DENTRY_E5_ESC   0x05
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#define FAT_DENTRY_E5_ESC   0x05
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#define FAT_DENTRY_DOT      0x2e
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#define FAT_DENTRY_DOT      0x2e
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#define FAT_DENTRY_ERASED   0xe5
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#define FAT_DENTRY_ERASED   0xe5
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 55 
 
- 
 
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/** Compare one component of path to a directory entry.
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 *
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 * @param dentry    Directory entry to compare the path component with.
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 * @param start     Index into PLB where the path component starts.
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 * @param last      Index of the last character of the path in PLB.
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 *
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 * @return      Zero on failure or delta such that (index + delta) %
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 *          PLB_SIZE points to a new path component in PLB.
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 */
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static int match_path_component(fat_dentry_t *dentry, unsigned index,
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static unsigned match_path_component(fat_dentry_t *dentry, unsigned start,
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    size_t len)
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    unsigned last)
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{
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{
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    unsigned cur;   /* current position in PLB */
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    int pos;    /* current position in dentry->name or dentry->ext */
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    bool name_processed = false;
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    bool dot_processed = false;
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    bool ext_processed = false;
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    if (last < start)
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        last += PLB_SIZE;
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    for (pos = 0, cur = start; (cur <= last) && (PLB_GET_CHAR(cur) != '/');
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        pos++, cur++) {
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        if (!name_processed) {
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            if ((pos == FAT_NAME_LEN - 1) ||
- 
 
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                (dentry->name[pos + 1] == FAT_PAD)) {
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                    /* this is the last character in name */
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                name_processed = true;
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            }
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            if (dentry->name[0] == FAT_PAD) {
- 
 
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                /* name is empty */
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                name_processed = true;
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            } else if ((pos == 0) && (dentry->name[pos] ==
- 
 
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                FAT_DENTRY_E5_ESC)) {
- 
 
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                if (PLB_GET_CHAR(cur) == 0xe5)
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                    continue;
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                else
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                    return 0;   /* character mismatch */
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            } else {
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                if (PLB_GET_CHAR(cur) == dentry->name[pos])
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                    continue;
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                else
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                    return 0;   /* character mismatch */
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            }
- 
 
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        }
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        if (!dot_processed) {
- 
 
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            dot_processed = true;
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            pos = -1;
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            if (PLB_GET_CHAR(cur) != '.')
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                return 0;
- 
 
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            continue;
- 
 
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        }
- 
 
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        if (!ext_processed) {
- 
 
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            if ((pos == FAT_EXT_LEN - 1) ||
- 
 
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                (dentry->ext[pos + 1] == FAT_PAD)) {
- 
 
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                /* this is the last character in ext */
- 
 
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                ext_processed = true;
- 
 
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            }
- 
 
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            if (dentry->ext[0] == FAT_PAD) {
- 
 
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                /* ext is empty; the match will fail */
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                ext_processed = true;
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            } else if (PLB_GET_CHAR(cur) == dentry->ext[pos]) {
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                continue;
- 
 
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            } else {
- 
 
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                /* character mismatch */
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                return 0;
- 
 
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            }
- 
 
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        }
- 
 
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        return 0;   /* extra characters in the component */
- 
 
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    }
- 
 
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    if (ext_processed || (name_processed && dentry->ext[0] == FAT_PAD))
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        return cur - start;
- 
 
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    else
- 
 
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        return 0;
59 
}
 129 
}
60 
 
 130 
 
61 
void fat_lookup(ipc_callid_t rid, ipc_call_t *request)
 131 
void fat_lookup(ipc_callid_t rid, ipc_call_t *request)
62 
{
 132 
{
63 
    int first = IPC_GET_ARG1(*request);
 133 
    int first = IPC_GET_ARG1(*request);