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Annotation of 43BSD/ucb/pascal/pdx/mappings/srcfile.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)srcfile.c  5.1 (Berkeley) 6/6/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * get the source file name associated with a given address
        !            13:  */
        !            14: 
        !            15: #include "defs.h"
        !            16: #include "mappings.h"
        !            17: #include "object.h"
        !            18: #include "filetab.h"
        !            19: 
        !            20: char *srcfilename(addr)
        !            21: ADDRESS addr;
        !            22: {
        !            23:        register ADDRESS i, j, k;
        !            24:        ADDRESS a;
        !            25:        FILETAB *ftp;
        !            26: 
        !            27:        if (addr < filetab[0].addr) {
        !            28:                return(NIL);
        !            29:        }
        !            30:        i = 0;
        !            31:        j = nlhdr.nfiles - 1;
        !            32:        while (i < j) {
        !            33:                k = (i + j) / 2;
        !            34:                ftp = &filetab[k];
        !            35:                if ((a = ftp->addr) == addr) {
        !            36:                        return(ftp->filename);
        !            37:                } else if (addr > a) {
        !            38:                        i = k + 1;
        !            39:                } else {
        !            40:                        j = k - 1;
        !            41:                }
        !            42:        }
        !            43:        if (addr >= filetab[i].addr) {
        !            44:                return(filetab[i].filename);
        !            45:        } else {
        !            46:                return(filetab[i-1].filename);
        !            47:        }
        !            48:        /*NOTREACHED*/
        !            49: }

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