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Annotation of 42BSD/usr.lib/libpc/READE.c, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1979 Regents of the University of California */
                      2: 
                      3: static char sccsid[] = "@(#)READE.c 1.5 6/10/81";
                      4: 
                      5: #include "h00vars.h"
                      6: 
                      7: long
                      8: READE(curfile, name)
                      9: 
                     10:        register struct iorec   *curfile;
                     11:        char                    *name;
                     12: {
                     13:        register short  *sptr;
                     14:        register int    len;
                     15:        register int    nextlen;
                     16:        register int    cnt;
                     17:        char            *cp;
                     18:        char            namebuf[NAMSIZ];
                     19:        int             retval;
                     20: 
                     21:        if (curfile->funit & FWRITE) {
                     22:                ERROR("%s: Attempt to read, but open for writing\n",
                     23:                        curfile->pfname);
                     24:                return;
                     25:        }
                     26:        UNSYNC(curfile);
                     27:        retval = fscanf(curfile->fbuf,
                     28:            "%*[ \t\n]%74[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]",
                     29:            namebuf);
                     30:        if (retval == EOF) {
                     31:                ERROR("%s: Tried to read past end of file\n", curfile->pfname);
                     32:                return;
                     33:        }
                     34:        if (retval == 0)
                     35:                goto ename;
                     36:        curfile->funit &= ~EOLN;
                     37:        curfile->funit |= SYNC;
                     38:        for (len = 0; len < NAMSIZ && namebuf[len]; len++)
                     39:                /* void */;
                     40:        len++;
                     41:        sptr = (short *)name;
                     42:        cnt = *sptr++;
                     43:        cp = name + sizeof (short) + *sptr;
                     44:        do      {
                     45:                nextlen = *sptr++;
                     46:                nextlen = *sptr - nextlen;
                     47:                if (nextlen == len && RELEQ(len, namebuf, cp)) {
                     48:                        return *((short *) name) - cnt;
                     49:                }
                     50:                cp += (int)nextlen;
                     51:        } while (--cnt);
                     52: ename:
                     53:        ERROR("Unknown name \"%s\" found on enumerated type read\n", namebuf);
                     54: }

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