sys/isofs/isofs_util.c

/*
 *      $Id: isofs_util.c,v 1.3 1993/07/19 13:40:08 cgd Exp $
 */

int
isonum_711 (p)
char *p;
{
        return (*p & 0xff);
}

int
isonum_712 (p)
char *p;
{
        int val;

        val = *p;
        if (val & 0x80)
                val |= 0xffffff00;
        return (val);
}

int
isonum_721 (p)
char *p;
{
        return ((p[0] & 0xff) | ((p[1] & 0xff) << 8));
}

int
isonum_722 (p)
char *p;
{
        return (((p[0] & 0xff) << 8) | (p[1] & 0xff));
}

int
isonum_723 (p)
char *p;
{
#if 0
        if (p[0] != p[3] || p[1] != p[2]) {
                fprintf (stderr, "invalid format 7.2.3 number\n");
                exit (1);
        }
#endif
        return (isonum_721 (p));
}

int
isonum_731 (p)
unsigned char *p;
{
        return ((p[0] & 0xff)
                | ((p[1] & 0xff) << 8)
                | ((p[2] & 0xff) << 16)
                | ((p[3] & 0xff) << 24));
}

int
isonum_732 (p)
unsigned char *p;
{
        return (((p[0] & 0xff) << 24)
                | ((p[1] & 0xff) << 16)
                | ((p[2] & 0xff) << 8)
                | (p[3] & 0xff));
}

int
isonum_733 (p)
unsigned char *p;
{
        int i;

#if 0
        for (i = 0; i < 4; i++) {
                if (p[i] != p[7-i]) {
                        fprintf (stderr, "bad format 7.3.3 number\n");
                        exit (1);
                }
        }
#endif
        return (isonum_731 (p));
}

/*
 * translate and compare a filename
 */
isofncmp(char *fn, int fnlen, char *isofn, int isolen) {
        int fnidx;

        fnidx = 0;
        for (fnidx = 0; fnidx < isolen; fnidx++, fn++) {
                char c = *isofn++;

                if (fnidx > fnlen)
                        return (0);

                if (c >= 'A' && c <= 'Z') {
                        if (c + ('a' - 'A') !=  *fn)
                                return(0);
                        else
                                continue;
                }
                if (c == ';')
                        return ((fnidx == fnlen));
                if (c != *fn)
                        return (0);
        }
        return (1);
}

/*
 * translate a filename
 */
void
isofntrans(char *infn, int infnlen, char *outfn, short *outfnlen) {
        int fnidx;

        fnidx = 0;
        for (fnidx = 0; fnidx < infnlen; fnidx++) {
                char c = *infn++;

                if (c >= 'A' && c <= 'Z')
                        *outfn++ = c + ('a' - 'A');
                else if (c == ';') {
                        *outfnlen = fnidx;
                        return;
                } else
                        *outfn++ = c;
        }
        *outfnlen = infnlen;
}