/*
* This routine returns the highest address of the segments in the program (NOT
* the shared libraries). It is intended to be used as a stop gap for programs
* that make UNIX style assumptions about how memory is allocated. Typicly the
* asumptions under which this is used is that memory is contiguously allocated
* by the program's text and data from address 0 with no gaps. The value of
* this differs from the value of &_end in a UNIX program in that this routine
* returns the address of the end of the segment not the end of the last section
* in that segment as would be the value of the symbol &_end.
*/
unsigned long
get_end(void)
{
static struct mach_header *mhp = (struct mach_header *)0;
struct segment_command *sgp;
unsigned long i, _end;
#ifndef __OPENSTEP__
if (mhp == (struct mach_header *)0) {
mhp = _NSGetMachExecuteHeader();
}
#else /* defined(__OPENSTEP__) */
DECLARE_VAR(_mh_execute_header, struct mach_header);
SETUP_VAR(_mh_execute_header);
mhp = (struct mach_header *)(& USE_VAR(_mh_execute_header));
#endif /* __OPENSTEP__ */
_end = 0;
sgp = (struct segment_command *)
((char *)mhp + sizeof(struct mach_header));
for(i = 0; i < mhp->ncmds; i++){
if(sgp->cmd == LC_SEGMENT)
if(sgp->vmaddr + sgp->vmsize > _end)
_end = sgp->vmaddr + sgp->vmsize;
sgp = (struct segment_command *)((char *)sgp + sgp->cmdsize);
}
return(_end);
}
const struct segment_command *
getsegbyname(
char *segname)
{
struct segment_command *sgp;
uint32_t i;
#ifndef RLD
#ifndef __OPENSTEP__
struct mach_header *mhp = _NSGetMachExecuteHeader();
#else /* defined(__OPENSTEP__) */
static struct mach_header *mhp = NULL;
DECLARE_VAR(_mh_execute_header, struct mach_header);
SETUP_VAR(_mh_execute_header);
mhp = (struct mach_header *)(& USE_VAR(_mh_execute_header));
#endif /* __OPENSTEP__ */
#else /* defined(RLD) */
mhp = (struct mach_header *)(&_mh_execute_header);
#endif /* defined(RLD) */
sgp = (struct segment_command *)
((char *)mhp + sizeof(struct mach_header));
for(i = 0; i < mhp->ncmds; i++){
if(sgp->cmd == LC_SEGMENT)
if(strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0)
return(sgp);
sgp = (struct segment_command *)((char *)sgp + sgp->cmdsize);
}
return(NULL);
}
const struct section *
getsectbyname(
const char *segname,
const char *sectname)
{
#ifndef __OPENSTEP__
struct mach_header *mhp = _NSGetMachExecuteHeader();
#else /* defined(__OPENSTEP__) */
static struct mach_header *mhp = NULL;
DECLARE_VAR(_mh_execute_header, struct mach_header);
SETUP_VAR(_mh_execute_header);
mhp = (struct mach_header *)(& USE_VAR(_mh_execute_header));
#endif /* __OPENSTEP__ */
return(getsectbynamefromheader(mhp, segname, sectname));
}