usr/src/usr.bin/pascal/libpc/READE.c

/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)READE.c     1.8 (Berkeley) 4/9/90";
#endif /* not lint */

#include "h00vars.h"

long
READE(curfile, name)

        register struct iorec   *curfile;
        char                    *name;
{
        register short  *sptr;
        register int    len;
        register int    nextlen;
        register int    cnt;
        char            *cp;
        char            namebuf[NAMSIZ];
        int             retval;

        if (curfile->funit & FWRITE) {
                ERROR("%s: Attempt to read, but open for writing\n",
                        curfile->pfname);
        }
        UNSYNC(curfile);
        retval = fscanf(curfile->fbuf,
            "%*[ \t\n]%74[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]",
            namebuf);
        if (retval == EOF) {
                ERROR("%s: Tried to read past end of file\n", curfile->pfname);
        }
        if (retval == 0)
                goto ename;
        for (len = 0; len < NAMSIZ && namebuf[len]; len++)
                /* void */;
        len++;
        sptr = (short *)name;
        cnt = *sptr++;
        cp = name + sizeof (short) + *sptr;
        do      {
                nextlen = *sptr++;
                nextlen = *sptr - nextlen;
                if (nextlen == len && RELEQ(len, namebuf, cp)) {
                        return *((short *) name) - cnt;
                }
                cp += (int)nextlen;
        } while (--cnt);
ename:
        ERROR("Unknown name \"%s\" found on enumerated type read\n", namebuf);
        return 0;
}