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