/* ---------------------------------
qset.c
implements set manipulations needed for quickhull
see qh-set.htm and qset.h
copyright (c) 1993-2002 The Geometry Center
*/
#include
#include
/*** uncomment here and qhull_a.h
if string.h does not define memcpy()
#include
*/
#include "qset.h"
#include "mem.h"
#ifndef qhDEFqhull
typedef struct ridgeT ridgeT;
typedef struct facetT facetT;
void qh_errexit(int exitcode, facetT *, ridgeT *);
#endif
/*=============== internal macros ===========================*/
/*---------------------------------
SETsizeaddr_(set)
return pointer to actual size+1 of set (set CANNOT be NULL!!)
notes:
*SETsizeaddr==NULL or e[*SETsizeaddr-1].p==NULL
*/
#define SETsizeaddr_(set) (&((set)->e[(set)->maxsize].i))
/*============ functions in alphabetical order ===================*/
/*----------------------------------
qh_setaddnth( setp, nth, newelem)
adds newelem as n'th element of sorted or unsorted *setp
notes:
*setp and newelem must be defined
*setp may be a temp set
nth=0 is first element
errors if nth is out of bounds
design:
expand *setp if empty or full
move tail of *setp up one
insert newelem
*/
void qh_setaddnth(setT **setp, int nth, void *newelem) {
int *sizep, oldsize, i;
void **oldp, **newp;
if (!*setp || !*(sizep= SETsizeaddr_(*setp))) {
qh_setlarger(setp);
sizep= SETsizeaddr_(*setp);
}
oldsize= *sizep - 1;
if (nth < 0 || nth > oldsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_setaddnth): nth %d is out-of-bounds for set:\n", nth);
qh_setprint (qhmem.ferr, "", *setp);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
(*sizep)++;
oldp= SETelemaddr_(*setp, oldsize, void); /* NULL */
newp= oldp+1;
for (i= oldsize-nth+1; i--; ) /* move at least NULL */
*(newp--)= *(oldp--); /* may overwrite *sizep */
*newp= newelem;
} /* setaddnth */
/*----------------------------------
setaddsorted( setp, newelem )
adds an newelem into sorted *setp
notes:
*setp and newelem must be defined
*setp may be a temp set
nop if newelem already in set
design:
find newelem's position in *setp
insert newelem
*/
void qh_setaddsorted(setT **setp, void *newelem) {
int newindex=0;
void *elem, **elemp;
FOREACHelem_(*setp) { /* could use binary search instead */
if (elem < newelem)
newindex++;
else if (elem == newelem)
return;
else
break;
}
qh_setaddnth(setp, newindex, newelem);
} /* setaddsorted */
/*---------------------------------
qh_setappend( setp, newelem)
append newelem to *setp
notes:
*setp may be a temp set
*setp and newelem may be NULL
design:
expand *setp if empty or full
append newelem to *setp
*/
void qh_setappend(setT **setp, void *newelem) {
int *sizep;
void **endp;
if (!newelem)
return;
if (!*setp || !*(sizep= SETsizeaddr_(*setp))) {
qh_setlarger(setp);
sizep= SETsizeaddr_(*setp);
}
*(endp= &((*setp)->e[(*sizep)++ - 1].p))= newelem;
*(++endp)= NULL;
} /* setappend */
/*---------------------------------
qh_setappend_set( setp, setA)
appends setA to *setp
notes:
*setp can not be a temp set
*setp and setA may be NULL
design:
setup for copy
expand *setp if it is too small
append all elements of setA to *setp
*/
void qh_setappend_set(setT **setp, setT *setA) {
int *sizep, sizeA, size;
setT *oldset;
if (!setA)
return;
SETreturnsize_(setA, sizeA);
if (!*setp)
*setp= qh_setnew (sizeA);
sizep= SETsizeaddr_(*setp);
if (!(size= *sizep))
size= (*setp)->maxsize;
else
size--;
if (size + sizeA > (*setp)->maxsize) {
oldset= *setp;
*setp= qh_setcopy (oldset, sizeA);
qh_setfree (&oldset);
sizep= SETsizeaddr_(*setp);
}
*sizep= size+sizeA+1; /* memcpy may overwrite */
if (sizeA > 0)
memcpy((char *)&((*setp)->e[size].p), (char *)&(setA->e[0].p), SETelemsize *(sizeA+1));
} /* setappend_set */
/*---------------------------------
qh_setappend2ndlast( setp, newelem )
makes newelem the next to the last element in *setp
notes:
*setp must have at least one element
newelem must be defined
*setp may be a temp set
design:
expand *setp if empty or full
move last element of *setp up one
insert newelem
*/
void qh_setappend2ndlast(setT **setp, void *newelem) {
int *sizep;
void **endp, **lastp;
if (!*setp || !*(sizep= SETsizeaddr_(*setp))) {
qh_setlarger(setp);
sizep= SETsizeaddr_(*setp);
}
endp= SETelemaddr_(*setp, (*sizep)++ -1, void); /* NULL */
lastp= endp-1;
*(endp++)= *lastp;
*endp= NULL; /* may overwrite *sizep */
*lastp= newelem;
} /* setappend2ndlast */
/*---------------------------------
qh_setcheck( set, typename, id )
check set for validity
report errors with typename and id
design:
checks that maxsize, actual size, and NULL terminator agree
*/
void qh_setcheck(setT *set, char *tname, int id) {
int maxsize, size;
int waserr= 0;
if (!set)
return;
SETreturnsize_(set, size);
maxsize= set->maxsize;
if (size > maxsize || !maxsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_setcheck): actual size %d of %s%d is greater than max size %d\n",
size, tname, id, maxsize);
waserr= 1;
}else if (set->e[size].p) {
fprintf (qhmem.ferr, "qhull internal error (qh_setcheck): %s%d (size %d max %d) is not null terminated.\n",
tname, id, maxsize, size-1);
waserr= 1;
}
if (waserr) {
qh_setprint (qhmem.ferr, "ERRONEOUS", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
} /* setcheck */
/*---------------------------------
qh_setcompact( set )
remove internal NULLs from an unsorted set
returns:
updated set
notes:
set may be NULL
it would be faster to swap tail of set into holes, like qh_setdel
design:
setup pointers into set
skip NULLs while copying elements to start of set
update the actual size
*/
void qh_setcompact(setT *set) {
int size;
void **destp, **elemp, **endp, **firstp;
if (!set)
return;
SETreturnsize_(set, size);
destp= elemp= firstp= SETaddr_(set, void);
endp= destp + size;
while (1) {
if (!(*destp++ = *elemp++)) {
destp--;
if (elemp > endp)
break;
}
}
qh_settruncate (set, destp-firstp);
} /* setcompact */
/*---------------------------------
qh_setcopy( set, extra )
make a copy of a sorted or unsorted set with extra slots
returns:
new set
design:
create a newset with extra slots
copy the elements to the newset
*/
setT *qh_setcopy(setT *set, int extra) {
setT *newset;
int size;
if (extra < 0)
extra= 0;
SETreturnsize_(set, size);
newset= qh_setnew(size+extra);
*SETsizeaddr_(newset)= size+1; /* memcpy may overwrite */
memcpy((char *)&(newset->e[0].p), (char *)&(set->e[0].p), SETelemsize *(size+1));
return (newset);
} /* setcopy */
/*---------------------------------
qh_setdel( set, oldelem )
delete oldelem from an unsorted set
returns:
returns oldelem if found
returns NULL otherwise
notes:
set may be NULL
oldelem must not be NULL;
only deletes one copy of oldelem in set
design:
locate oldelem
update actual size if it was full
move the last element to the oldelem's location
*/
void *qh_setdel(setT *set, void *oldelem) {
void **elemp, **lastp;
int *sizep;
if (!set)
return NULL;
elemp= SETaddr_(set, void);
while (*elemp != oldelem && *elemp)
elemp++;
if (*elemp) {
sizep= SETsizeaddr_(set);
if (!(*sizep)--) /* if was a full set */
*sizep= set->maxsize; /* *sizep= (maxsize-1)+ 1 */
lastp= SETelemaddr_(set, *sizep-1, void);
*elemp= *lastp; /* may overwrite itself */
*lastp= NULL;
return oldelem;
}
return NULL;
} /* setdel */
/*---------------------------------
qh_setdellast( set)
return last element of set or NULL
notes:
deletes element from set
set may be NULL
design:
return NULL if empty
if full set
delete last element and set actual size
else
delete last element and update actual size
*/
void *qh_setdellast(setT *set) {
int setsize; /* actually, actual_size + 1 */
int maxsize;
int *sizep;
void *returnvalue;
if (!set || !(set->e[0].p))
return NULL;
sizep= SETsizeaddr_(set);
if ((setsize= *sizep)) {
returnvalue= set->e[setsize - 2].p;
set->e[setsize - 2].p= NULL;
(*sizep)--;
}else {
maxsize= set->maxsize;
returnvalue= set->e[maxsize - 1].p;
set->e[maxsize - 1].p= NULL;
*sizep= maxsize;
}
return returnvalue;
} /* setdellast */
/*---------------------------------
qh_setdelnth( set, nth )
deletes nth element from unsorted set
0 is first element
returns:
returns the element (needs type conversion)
notes:
errors if nth invalid
design:
setup points and check nth
delete nth element and overwrite with last element
*/
void *qh_setdelnth(setT *set, int nth) {
void **elemp, **lastp, *elem;
int *sizep;
elemp= SETelemaddr_(set, nth, void);
sizep= SETsizeaddr_(set);
if (!(*sizep)--) /* if was a full set */
*sizep= set->maxsize; /* *sizep= (maxsize-1)+ 1 */
if (nth < 0 || nth >= *sizep) {
fprintf (qhmem.ferr, "qhull internal error (qh_setaddnth): nth %d is out-of-bounds for set:\n", nth);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
lastp= SETelemaddr_(set, *sizep-1, void);
elem= *elemp;
*elemp= *lastp; /* may overwrite itself */
*lastp= NULL;
return elem;
} /* setdelnth */
/*---------------------------------
qh_setdelnthsorted( set, nth )
deletes nth element from sorted set
returns:
returns the element (use type conversion)
notes:
errors if nth invalid
see also:
setnew_delnthsorted
design:
setup points and check nth
copy remaining elements down one
update actual size
*/
void *qh_setdelnthsorted(setT *set, int nth) {
void **newp, **oldp, *elem;
int *sizep;
sizep= SETsizeaddr_(set);
if (nth < 0 || (*sizep && nth >= *sizep-1) || nth >= set->maxsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_setaddnth): nth %d is out-of-bounds for set:\n", nth);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
newp= SETelemaddr_(set, nth, void);
elem= *newp;
oldp= newp+1;
while ((*(newp++)= *(oldp++)))
; /* copy remaining elements and NULL */
if (!(*sizep)--) /* if was a full set */
*sizep= set->maxsize; /* *sizep= (max size-1)+ 1 */
return elem;
} /* setdelnthsorted */
/*---------------------------------
qh_setdelsorted( set, oldelem )
deletes oldelem from sorted set
returns:
returns oldelem if it was deleted
notes:
set may be NULL
design:
locate oldelem in set
copy remaining elements down one
update actual size
*/
void *qh_setdelsorted(setT *set, void *oldelem) {
void **newp, **oldp;
int *sizep;
if (!set)
return NULL;
newp= SETaddr_(set, void);
while(*newp != oldelem && *newp)
newp++;
if (*newp) {
oldp= newp+1;
while ((*(newp++)= *(oldp++)))
; /* copy remaining elements */
sizep= SETsizeaddr_(set);
if (!(*sizep)--) /* if was a full set */
*sizep= set->maxsize; /* *sizep= (max size-1)+ 1 */
return oldelem;
}
return NULL;
} /* setdelsorted */
/*---------------------------------
qh_setduplicate( set, elemsize )
duplicate a set of elemsize elements
notes:
use setcopy if retaining old elements
design:
create a new set
for each elem of the old set
create a newelem
append newelem to newset
*/
setT *qh_setduplicate (setT *set, int elemsize) {
void *elem, **elemp, *newElem;
setT *newSet;
int size;
if (!(size= qh_setsize (set)))
return NULL;
newSet= qh_setnew (size);
FOREACHelem_(set) {
newElem= qh_memalloc (elemsize);
memcpy (newElem, elem, elemsize);
qh_setappend (&newSet, newElem);
}
return newSet;
} /* setduplicate */
/*---------------------------------
qh_setequal( )
returns 1 if two sorted sets are equal, otherwise returns 0
notes:
either set may be NULL
design:
check size of each set
setup pointers
compare elements of each set
*/
int qh_setequal(setT *setA, setT *setB) {
void **elemAp, **elemBp;
int sizeA, sizeB;
SETreturnsize_(setA, sizeA);
SETreturnsize_(setB, sizeB);
if (sizeA != sizeB)
return 0;
if (!sizeA)
return 1;
elemAp= SETaddr_(setA, void);
elemBp= SETaddr_(setB, void);
if (!memcmp((char *)elemAp, (char *)elemBp, sizeA*SETelemsize))
return 1;
return 0;
} /* setequal */
/*---------------------------------
qh_setequal_except( setA, skipelemA, setB, skipelemB )
returns 1 if sorted setA and setB are equal except for skipelemA & B
returns:
false if either skipelemA or skipelemB are missing
notes:
neither set may be NULL
if skipelemB is NULL,
can skip any one element of setB
design:
setup pointers
search for skipelemA, skipelemB, and mismatches
check results
*/
int qh_setequal_except (setT *setA, void *skipelemA, setT *setB, void *skipelemB) {
void **elemA, **elemB;
int skip=0;
elemA= SETaddr_(setA, void);
elemB= SETaddr_(setB, void);
while (1) {
if (*elemA == skipelemA) {
skip++;
elemA++;
}
if (skipelemB) {
if (*elemB == skipelemB) {
skip++;
elemB++;
}
}else if (*elemA != *elemB) {
skip++;
if (!(skipelemB= *elemB++))
return 0;
}
if (!*elemA)
break;
if (*elemA++ != *elemB++)
return 0;
}
if (skip != 2 || *elemB)
return 0;
return 1;
} /* setequal_except */
/*---------------------------------
qh_setequal_skip( setA, skipA, setB, skipB )
returns 1 if sorted setA and setB are equal except for elements skipA & B
returns:
false if different size
notes:
neither set may be NULL
design:
setup pointers
search for mismatches while skipping skipA and skipB
*/
int qh_setequal_skip (setT *setA, int skipA, setT *setB, int skipB) {
void **elemA, **elemB, **skipAp, **skipBp;
elemA= SETaddr_(setA, void);
elemB= SETaddr_(setB, void);
skipAp= SETelemaddr_(setA, skipA, void);
skipBp= SETelemaddr_(setB, skipB, void);
while (1) {
if (elemA == skipAp)
elemA++;
if (elemB == skipBp)
elemB++;
if (!*elemA)
break;
if (*elemA++ != *elemB++)
return 0;
}
if (*elemB)
return 0;
return 1;
} /* setequal_skip */
/*---------------------------------
qh_setfree( setp )
frees the space occupied by a sorted or unsorted set
returns:
sets setp to NULL
notes:
set may be NULL
design:
free array
free set
*/
void qh_setfree(setT **setp) {
int size;
void **freelistp; /* used !qh_NOmem */
if (*setp) {
size= sizeof(setT) + ((*setp)->maxsize)*SETelemsize;
if (size <= qhmem.LASTsize) {
qh_memfree_(*setp, size, freelistp);
}else
qh_memfree (*setp, size);
*setp= NULL;
}
} /* setfree */
/*---------------------------------
qh_setfree2( setp, elemsize )
frees the space occupied by a set and its elements
notes:
set may be NULL
design:
free each element
free set
*/
void qh_setfree2 (setT **setp, int elemsize) {
void *elem, **elemp;
FOREACHelem_(*setp)
qh_memfree (elem, elemsize);
qh_setfree (setp);
} /* setfree2 */
/*---------------------------------
qh_setfreelong( setp )
frees a set only if it's in long memory
returns:
sets setp to NULL if it is freed
notes:
set may be NULL
design:
if set is large
free it
*/
void qh_setfreelong(setT **setp) {
int size;
if (*setp) {
size= sizeof(setT) + ((*setp)->maxsize)*SETelemsize;
if (size > qhmem.LASTsize) {
qh_memfree (*setp, size);
*setp= NULL;
}
}
} /* setfreelong */
/*---------------------------------
qh_setin( set, setelem )
returns 1 if setelem is in a set, 0 otherwise
notes:
set may be NULL or unsorted
design:
scans set for setelem
*/
int qh_setin(setT *set, void *setelem) {
void *elem, **elemp;
FOREACHelem_(set) {
if (elem == setelem)
return 1;
}
return 0;
} /* setin */
/*---------------------------------
qh_setindex( set, atelem )
returns the index of atelem in set.
returns -1, if not in set or maxsize wrong
notes:
set may be NULL and may contain nulls.
design:
checks maxsize
scans set for atelem
*/
int qh_setindex(setT *set, void *atelem) {
void **elem;
int size, i;
SETreturnsize_(set, size);
if (size > set->maxsize)
return -1;
elem= SETaddr_(set, void);
for (i=0; i < size; i++) {
if (*elem++ == atelem)
return i;
}
return -1;
} /* setindex */
/*---------------------------------
qh_setlarger( oldsetp )
returns a larger set that contains all elements of *oldsetp
notes:
the set is at least twice as large
if temp set, updates qhmem.tempstack
design:
creates a new set
copies the old set to the new set
updates pointers in tempstack
deletes the old set
*/
void qh_setlarger(setT **oldsetp) {
int size= 1, *sizep;
setT *newset, *set, **setp, *oldset;
void **oldp, **newp;
if (*oldsetp) {
oldset= *oldsetp;
SETreturnsize_(oldset, size);
qhmem.cntlarger++;
qhmem.totlarger += size+1;
newset= qh_setnew(2 * size);
oldp= SETaddr_(oldset, void);
newp= SETaddr_(newset, void);
memcpy((char *)newp, (char *)oldp, (size+1) * SETelemsize);
sizep= SETsizeaddr_(newset);
*sizep= size+1;
FOREACHset_((setT *)qhmem.tempstack) {
if (set == oldset)
*(setp-1)= newset;
}
qh_setfree(oldsetp);
}else
newset= qh_setnew(3);
*oldsetp= newset;
} /* setlarger */
/*---------------------------------
qh_setlast( )
return last element of set or NULL (use type conversion)
notes:
set may be NULL
design:
return last element
*/
void *qh_setlast(setT *set) {
int size;
if (set) {
size= *SETsizeaddr_(set);
if (!size)
return SETelem_(set, set->maxsize - 1);
else if (size > 1)
return SETelem_(set, size - 2);
}
return NULL;
} /* setlast */
/*---------------------------------
qh_setnew( setsize )
creates and allocates space for a set
notes:
setsize means the number of elements (NOT including the NULL terminator)
use qh_settemp/qh_setfreetemp if set is temporary
design:
allocate memory for set
roundup memory if small set
initialize as empty set
*/
setT *qh_setnew(int setsize) {
setT *set;
int sizereceived; /* used !qh_NOmem */
int size;
void **freelistp; /* used !qh_NOmem */
if (!setsize)
setsize++;
size= sizeof(setT) + setsize * SETelemsize;
if ((unsigned) size <= (unsigned) qhmem.LASTsize) {
qh_memalloc_(size, freelistp, set, setT);
#ifndef qh_NOmem
sizereceived= qhmem.sizetable[ qhmem.indextable[size]];
if (sizereceived > size)
setsize += (sizereceived - size)/SETelemsize;
#endif
}else
set= (setT*)qh_memalloc (size);
set->maxsize= setsize;
set->e[setsize].i= 1;
set->e[0].p= NULL;
return (set);
} /* setnew */
/*---------------------------------
qh_setnew_delnthsorted( set, size, nth, prepend )
creates a sorted set not containing nth element
if prepend, the first prepend elements are undefined
notes:
set must be defined
checks nth
see also: setdelnthsorted
design:
create new set
setup pointers and allocate room for prepend'ed entries
append head of old set to new set
append tail of old set to new set
*/
setT *qh_setnew_delnthsorted(setT *set, int size, int nth, int prepend) {
setT *newset;
void **oldp, **newp;
int tailsize= size - nth -1, newsize;
if (tailsize < 0) {
fprintf (qhmem.ferr, "qhull internal error (qh_setaddnth): nth %d is out-of-bounds for set:\n", nth);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
newsize= size-1 + prepend;
newset= qh_setnew(newsize);
newset->e[newset->maxsize].i= newsize+1; /* may be overwritten */
oldp= SETaddr_(set, void);
newp= SETaddr_(newset, void) + prepend;
switch (nth) {
case 0:
break;
case 1:
*(newp++)= *oldp++;
break;
case 2:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
case 3:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
case 4:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
default:
memcpy((char *)newp, (char *)oldp, nth * SETelemsize);
newp += nth;
oldp += nth;
break;
}
oldp++;
switch (tailsize) {
case 0:
break;
case 1:
*(newp++)= *oldp++;
break;
case 2:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
case 3:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
case 4:
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
*(newp++)= *oldp++;
break;
default:
memcpy((char *)newp, (char *)oldp, tailsize * SETelemsize);
newp += tailsize;
}
*newp= NULL;
return(newset);
} /* setnew_delnthsorted */
/*---------------------------------
qh_setprint( fp, string, set )
print set elements to fp with identifying string
notes:
never errors
*/
void qh_setprint(FILE *fp, char* string, setT *set) {
int size, k;
if (!set)
fprintf (fp, "%s set is null\n", string);
else {
SETreturnsize_(set, size);
fprintf (fp, "%s set=%p maxsize=%d size=%d elems=",
string, set, set->maxsize, size);
if (size > set->maxsize)
size= set->maxsize+1;
for (k=0; k < size; k++)
fprintf(fp, " %p", set->e[k].p);
fprintf(fp, "\n");
}
} /* setprint */
/*---------------------------------
qh_setreplace( set, oldelem, newelem )
replaces oldelem in set with newelem
notes:
errors if oldelem not in the set
newelem may be NULL, but it turns the set into an indexed set (no FOREACH)
design:
find oldelem
replace with newelem
*/
void qh_setreplace(setT *set, void *oldelem, void *newelem) {
void **elemp;
elemp= SETaddr_(set, void);
while(*elemp != oldelem && *elemp)
elemp++;
if (*elemp)
*elemp= newelem;
else {
fprintf (qhmem.ferr, "qhull internal error (qh_setreplace): elem %p not found in set\n",
oldelem);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
} /* setreplace */
/*---------------------------------
qh_setsize( set )
returns the size of a set
notes:
errors if set's maxsize is incorrect
same as SETreturnsize_(set)
design:
determine actual size of set from maxsize
*/
int qh_setsize(setT *set) {
int size, *sizep;
if (!set)
return (0);
sizep= SETsizeaddr_(set);
if ((size= *sizep)) {
size--;
if (size > set->maxsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_setsize): current set size %d is greater than maximum size %d\n",
size, set->maxsize);
qh_setprint (qhmem.ferr, "set: ", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
}else
size= set->maxsize;
return size;
} /* setsize */
/*---------------------------------
qh_settemp( setsize )
return a stacked, temporary set of upto setsize elements
notes:
use settempfree or settempfree_all to release from qhmem.tempstack
see also qh_setnew
design:
allocate set
append to qhmem.tempstack
*/
setT *qh_settemp(int setsize) {
setT *newset;
newset= qh_setnew (setsize);
qh_setappend ((setT **)&qhmem.tempstack, newset);
if (qhmem.IStracing >= 5)
fprintf (qhmem.ferr, "qh_settemp: temp set %p of %d elements, depth %d\n",
newset, newset->maxsize, qh_setsize ((setT*)qhmem.tempstack));
return newset;
} /* settemp */
/*---------------------------------
qh_settempfree( set )
free temporary set at top of qhmem.tempstack
notes:
nop if set is NULL
errors if set not from previous qh_settemp
to locate errors:
use 'T2' to find source and then find mis-matching qh_settemp
design:
check top of qhmem.tempstack
free it
*/
void qh_settempfree(setT **set) {
setT *stackedset;
if (!*set)
return;
stackedset= qh_settemppop ();
if (stackedset != *set) {
qh_settemppush(stackedset);
fprintf (qhmem.ferr, "qhull internal error (qh_settempfree): set %p (size %d) was not last temporary allocated (depth %d, set %p, size %d)\n",
*set, qh_setsize(*set), qh_setsize((setT*)qhmem.tempstack)+1,
stackedset, qh_setsize(stackedset));
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
qh_setfree (set);
} /* settempfree */
/*---------------------------------
qh_settempfree_all( )
free all temporary sets in qhmem.tempstack
design:
for each set in tempstack
free set
free qhmem.tempstack
*/
void qh_settempfree_all(void) {
setT *set, **setp;
FOREACHset_((setT *)qhmem.tempstack)
qh_setfree(&set);
qh_setfree((setT **)&qhmem.tempstack);
} /* settempfree_all */
/*---------------------------------
qh_settemppop( )
pop and return temporary set from qhmem.tempstack
notes:
the returned set is permanent
design:
pop and check top of qhmem.tempstack
*/
setT *qh_settemppop(void) {
setT *stackedset;
stackedset= (setT*)qh_setdellast((setT *)qhmem.tempstack);
if (!stackedset) {
fprintf (qhmem.ferr, "qhull internal error (qh_settemppop): pop from empty temporary stack\n");
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
if (qhmem.IStracing >= 5)
fprintf (qhmem.ferr, "qh_settemppop: depth %d temp set %p of %d elements\n",
qh_setsize((setT*)qhmem.tempstack)+1, stackedset, qh_setsize(stackedset));
return stackedset;
} /* settemppop */
/*---------------------------------
qh_settemppush( set )
push temporary set unto qhmem.tempstack (makes it temporary)
notes:
duplicates settemp() for tracing
design:
append set to tempstack
*/
void qh_settemppush(setT *set) {
qh_setappend ((setT**)&qhmem.tempstack, set);
if (qhmem.IStracing >= 5)
fprintf (qhmem.ferr, "qh_settemppush: depth %d temp set %p of %d elements\n",
qh_setsize((setT*)qhmem.tempstack), set, qh_setsize(set));
} /* settemppush */
/*---------------------------------
qh_settruncate( set, size )
truncate set to size elements
notes:
set must be defined
see:
SETtruncate_
design:
check size
update actual size of set
*/
void qh_settruncate (setT *set, int size) {
if (size < 0 || size > set->maxsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_settruncate): size %d out of bounds for set:\n", size);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
set->e[set->maxsize].i= size+1; /* maybe overwritten */
set->e[size].p= NULL;
} /* settruncate */
/*---------------------------------
qh_setunique( set, elem )
add elem to unsorted set unless it is already in set
notes:
returns 1 if it is appended
design:
if elem not in set
append elem to set
*/
int qh_setunique (setT **set, void *elem) {
if (!qh_setin (*set, elem)) {
qh_setappend (set, elem);
return 1;
}
return 0;
} /* setunique */
/*---------------------------------
qh_setzero( set, index, size )
zero elements from index on
set actual size of set to size
notes:
set must be defined
the set becomes an indexed set (can not use FOREACH...)
see also:
qh_settruncate
design:
check index and size
update actual size
zero elements starting at e[index]
*/
void qh_setzero (setT *set, int index, int size) {
int count;
if (index < 0 || index >= size || size > set->maxsize) {
fprintf (qhmem.ferr, "qhull internal error (qh_setzero): index %d or size %d out of bounds for set:\n", index, size);
qh_setprint (qhmem.ferr, "", set);
qh_errexit (qhmem_ERRqhull, NULL, NULL);
}
set->e[set->maxsize].i= size+1; /* may be overwritten */
count= size - index + 1; /* +1 for NULL terminator */
memset ((char *)SETelemaddr_(set, index, void), 0, count * SETelemsize);
} /* setzero */