Reading .debug_macinfo (DWARF2-4)

Example reading .debug_macinfo, DWARF2-4.

*/
 
void functionusingsigned(Dwarf_Signed s) {
    /* Do something */
    /* Avoid compiler warnings. */
    (void)s;
}
 
int examplep2(Dwarf_Debug dbg, Dwarf_Off cur_off,
    Dwarf_Error*error)
{
    Dwarf_Signed         count = 0;
    Dwarf_Macro_Details *maclist = 0;
    Dwarf_Signed         i = 0;
    Dwarf_Unsigned       max = 500000; /* sanity limit */
    int errv = 0;
 
    /*  This is for DWARF2,DWARF3, and DWARF4
        .debug_macinfo section only.*/
    /*  Given an offset from a compilation unit,
        start at that offset (from DW_AT_macroinfo)
        and get its macro details. */
    errv = dwarf_get_macro_details(dbg, cur_off,max,
        &count,&maclist,error);
    if (errv == DW_DLV_OK) {
        for (i = 0; i < count; ++i) {
            Dwarf_Macro_Details *  mentry = maclist +i;
            /* example of use */
            Dwarf_Signed lineno = mentry->dmd_lineno;
            functionusingsigned(lineno);
        }
        dwarf_dealloc(dbg, maclist, DW_DLA_STRING);
    }
    /*  Loop through all the compilation units macro info from zero.
        This is not guaranteed to work because DWARF does not
        guarantee every byte in the section is meaningful:
        there can be garbage between the macro info
        for CUs.  But this loop will sometimes work.
    */
    cur_off = 0;
    while((errv = dwarf_get_macro_details(dbg, cur_off,max,
        &count,&maclist,error))== DW_DLV_OK) {
        for (i = 0; i < count; ++i) {
            Dwarf_Macro_Details *  mentry = maclist +i;
            /* example of use */
            Dwarf_Signed lineno = mentry->dmd_lineno;
            functionusingsigned(lineno);
        }
        cur_off = maclist[count-1].dmd_offset + 1;
        dwarf_dealloc(dbg, maclist, DW_DLA_STRING);
    }
    return DW_DLV_OK;
}