mount.c File Reference

#include <xinu.h>

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Functions
syscall	mount (char *prefix, char *replace, did32 device)
int32	namlen (char *name, int32 maxlen)

Function Documentation

mount()

syscall mount	(	char *	prefix,
		char *	replace,
		did32	device
	)

Definition at line 9 of file mount.c.

References disable(), isbaddev, nametab, namlen(), nmentry::ndevice, NM_PRELEN, NM_REPLLEN, NNAMES, nnames, nmentry::nprefix, nmentry::nreplace, OK, restore(), and SYSERR.

Referenced by naminit().

{
    intmask mask;           /* Saved interrupt mask     */
    struct  nmentry *namptr;    /* Pointer to unused table entry*/
    int32   psiz, rsiz;     /* Sizes of prefix & replacement*/
    int32   i;          /* Counter for copy loop    */

        mask = disable();

    psiz = namlen(prefix, NM_PRELEN);
    rsiz = namlen(replace, NM_REPLLEN);

    /* If arguments are invalid or table is full, return error */

    if ( (psiz == SYSERR)   || (rsiz == SYSERR) ||
         (isbaddev(device)) || (nnames >= NNAMES) ) {
        restore(mask);
        return SYSERR;
    }

    /* Allocate a slot in the table */

    namptr = &nametab[nnames];  /* Next unused entry in table   */

    /* copy prefix and replacement strings and record device ID */
    
    for (i=0; i<psiz; i++) {    /* Copy prefix into table entry */
        namptr->nprefix[i] = *prefix++;
    }

    for (i=0; i<rsiz; i++) {    /* Copy replacement into entry  */
        namptr->nreplace[i] = *replace++;
    }

    namptr->ndevice = device;   /* Record the device ID     */

        nnames++;           /* Increment number of names    */

    restore(mask);
    return OK;
}

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namlen()

int32 namlen	(	char *	name,
		int32	maxlen
	)

Definition at line 60 of file mount.c.

References NULLCH, and SYSERR.

Referenced by dns_geta(), mount(), and namrepl().

{
    int32   i;          /* Count of characters found    */

    /* Search until a null terminator or length reaches max */

    for (i=0; i < maxlen; i++) {
        if (*name++ == NULLCH) {
            return i+1; /* Include NULLCH in length */
        }
    }
    return SYSERR;
}

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