naminit.c

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#include <xinu.h>

#ifndef RFILESYS
#define RFILESYS SYSERR
#endif

#ifndef FILESYS
#define FILESYS SYSERR
#endif

#ifndef LFILESYS
#define LFILESYS SYSERR
#endif

struct nmentry nametab[NNAMES]; /* Table of name mappings   */
int32 nnames;                   /* Number of entries allocated  */

/*------------------------------------------------------------------------
 *  naminit  -  Initialize the syntactic namespace
 *------------------------------------------------------------------------
 */
status naminit(void)
{
    did32 i;                    /* Index into devtab        */
    struct dentry *devptr;      /* Pointer to device table entry*/
    char tmpstr[NM_MAXLEN];     /* String to hold a name    */
    status retval;              /* Return value         */
    char *tptr;                 /* Pointer into tempstring  */
    char *nptr;                 /* Pointer to device name   */
    char devprefix[] = "/dev/"; /* Prefix to use for devices    */
    int32 len;                  /* Length of created name   */
    char ch;                    /* Storage for a character  */

    /* Set prefix table to empty */

    nnames = 0;

    for (i = 0; i < NDEVS; i++)
    {
        tptr = tmpstr;
        nptr = devprefix;

        /* Copy prefix into tmpstr */

        len = 0;
        while ((*tptr++ = *nptr++) != NULLCH)
        {
            len++;
        }
        tptr--; /* Move pointer to position before NULLCH */
        devptr = &devtab[i];
        nptr = devptr->dvname; /* Move to device name */

        /* Map device name to lower case and append */

        while (++len < NM_MAXLEN)
        {
            ch = *nptr++;
            if ((ch >= 'A') && (ch <= 'Z'))
            {
                ch += 'a' - 'A';
            }
            if ((*tptr++ = ch) == NULLCH)
            {
                break;
            }
        }

        if (len > NM_MAXLEN)
        {
            kprintf("namespace: device name %s too long\r\n",
                    devptr->dvname);
            continue;
        }

        retval = mount(tmpstr, NULLSTR, devptr->dvnum);
        if (retval == SYSERR)
        {
            kprintf("namespace: cannot mount device %d\r\n",
                    devptr->dvname);
            continue;
        }
    }

    /* Add other prefixes (longest prefix first) */

    mount("/dev/null", "", NULLDEV);
    mount("/remote/", "remote:", RFILESYS);
    mount("/local/", NULLSTR, LFILESYS);
    mount("/dev/", NULLSTR, SYSERR);
    mount("~/", NULLSTR, LFILESYS);
    mount("/", "root:", RFILESYS);
    mount("", "", LFILESYS);

    return OK;
}