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Annotation of 42BSD/ucb/pascal/pdx/mappings/srcfile.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: 
        !             3: static char sccsid[] = "@(#)srcfile.c 1.1 1/18/82";
        !             4: 
        !             5: /*
        !             6:  * get the source file name associated with a given address
        !             7:  */
        !             8: 
        !             9: #include "defs.h"
        !            10: #include "mappings.h"
        !            11: #include "object.h"
        !            12: #include "filetab.h"
        !            13: 
        !            14: char *srcfilename(addr)
        !            15: ADDRESS addr;
        !            16: {
        !            17:        register ADDRESS i, j, k;
        !            18:        ADDRESS a;
        !            19:        FILETAB *ftp;
        !            20: 
        !            21:        if (addr < filetab[0].addr) {
        !            22:                return(NIL);
        !            23:        }
        !            24:        i = 0;
        !            25:        j = nlhdr.nfiles - 1;
        !            26:        while (i < j) {
        !            27:                k = (i + j) / 2;
        !            28:                ftp = &filetab[k];
        !            29:                if ((a = ftp->addr) == addr) {
        !            30:                        return(ftp->filename);
        !            31:                } else if (addr > a) {
        !            32:                        i = k + 1;
        !            33:                } else {
        !            34:                        j = k - 1;
        !            35:                }
        !            36:        }
        !            37:        if (addr >= filetab[i].addr) {
        !            38:                return(filetab[i].filename);
        !            39:        } else {
        !            40:                return(filetab[i-1].filename);
        !            41:        }
        !            42:        /*NOTREACHED*/
        !            43: }

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