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Annotation of 42BSD/ucb/pascal/pdx/mappings/srcfile.c, revision 1.1.1.1

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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