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

1.1       root        1: /* Copyright (c) 1982 Regents of the University of California */
                      2: 
                      3: static char sccsid[] = "@(#)srcline.c 1.1 1/18/82";
                      4: 
                      5: /*
                      6:  * lookup the source line number nearest from below to an address
                      7:  */
                      8: 
                      9: #include "defs.h"
                     10: #include "mappings.h"
                     11: #include "object.h"
                     12: #include "linetab.h"
                     13: 
                     14: LINENO srcline(addr)
                     15: ADDRESS addr;
                     16: {
                     17:        register ADDRESS i, j, k;
                     18:        ADDRESS a;
                     19: 
                     20:        if (nlhdr.nlines == 0) {
                     21:                return(0);
                     22:        }
                     23:        i = 0;
                     24:        j = nlhdr.nlines - 1;
                     25:        if (addr <= linetab[i].addr) {
                     26:                return(linetab[i].line);
                     27:        } else if (addr >= linetab[j].addr) {
                     28:                return(linetab[j].line);
                     29:        }
                     30:        while (i <= j) {
                     31:                k = (i + j) / 2;
                     32:                if ((a = linetab[k].addr) == addr) {
                     33:                        return(linetab[k].line);
                     34:                } else if (addr > a) {
                     35:                        i = k+1;
                     36:                } else {
                     37:                        j = k-1;
                     38:                }
                     39:        }
                     40:        if (addr > linetab[i].addr) {
                     41:                return(linetab[i].line);
                     42:        } else {
                     43:                return(linetab[i-1].line);
                     44:        }
                     45:        /*NOTREACHED*/
                     46: }
                     47: 
                     48: /*
                     49:  * look for a line exactly corresponding to the given address
                     50:  */
                     51: 
                     52: LINENO linelookup(addr)
                     53: ADDRESS addr;
                     54: {
                     55:        register ADDRESS i, j, k;
                     56:        ADDRESS a;
                     57: 
                     58:        if (nlhdr.nlines == 0 || addr < linetab[0].addr) {
                     59:                return(0);
                     60:        }
                     61:        i = 0;
                     62:        j = nlhdr.nlines - 1;
                     63:        while (i <= j) {
                     64:                k = (i + j) / 2;
                     65:                if ((a = linetab[k].addr) == addr) {
                     66:                        return(linetab[k].line);
                     67:                } else if (addr > a) {
                     68:                        i = k+1;
                     69:                } else {
                     70:                        j = k-1;
                     71:                }
                     72:        }
                     73:        return(0);
                     74: }

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