newlib-cygwin/newlib/libc/search/tdelete.c

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* Makefile.am (LIB_OBJECTLISTS): Add libc/search/objectlist.awk.in. * libc/Makefile.am (SUBDIRS): Add search. (SUBLIBS): Add search/libsearch.la. * libc/configure.in (AC_OUTPUT): Add search/Makefile. * libc/search: New directory. * libc/search/Makefile.am: New file. * libc/search/extern.h: New file. * libc/search/hash.c: New file. * libc/search/hash.h: New file. * libc/search/hash_bigkey.c: New file. * libc/search/hash_buf.c: New file. * libc/search/hash_func.c: New file. * libc/search/hash_log2.c: New file. * libc/search/hash_page.c: New file. * libc/search/hcreate.3: New file. * libc/search/hcreate.c: New file. * libc/search/hcreate.c~: New file. * libc/search/hcreate_r.c: New file. * libc/search/ndbm.c: New file. * libc/search/page.h: New file. * libc/search/tdelete.c: New file. * libc/search/tdestroy.c: New file. * libc/search/tfind.c: New file. * libc/search/tsearch.3: New file. * libc/search/tsearch.c: New file. * libc/search/twalk.c: New file. * libc/include/db.h: New file. * libc/include/ndbm.h: New file. * libc/include/search.h: New file. * libc/include/sys/queue.h: New file. * libc/include/sys/cdefs.h: New file. * libc/include/sys/param.h [__IEEE_LITTLE_ENDIAN,__IEEE_BIG_ENDIAN]: Set BYTE_ORDER to LITTLE_ENDIAN or BIG_ENDIAN. * libc/include/sys/errno.h (EFTYPE): New macro. * libc/search/bsearch.c: Move from libc/stdlib. * libc/search/qsort.c: Likewise. * libc/stdlib/Makefile.am (LIB_SOURCES): Remove bsearch.c and qsort.c. (CHEWOUT_FILES): Remove bsearch.def and qsort.def. * libc/stdlib/stdlib.tex: Remove references to bsearch and qsort.
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/* $NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $ */
/*
* Tree search generalized from Knuth (6.2.2) Algorithm T just like
* the AT&T man page says.
*
* The node_t structure is for internal use only, lint doesn't grok it.
*
* Written by reading the System V Interface Definition, not the code.
*
* Totally public domain.
*/
#include <sys/cdefs.h>
#if 0
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
#endif /* LIBC_SCCS and not lint */
#endif
#include <assert.h>
#define _SEARCH_PRIVATE
#include <search.h>
#include <stdlib.h>
/* delete node with given key */
void *
_DEFUN(tdelete, (vkey, vrootp, compar),
const void *vkey _AND /* key to be deleted */
void **vrootp _AND /* address of the root of tree */
int (*compar)(const void *, const void *))
* Makefile.am (LIB_OBJECTLISTS): Add libc/search/objectlist.awk.in. * libc/Makefile.am (SUBDIRS): Add search. (SUBLIBS): Add search/libsearch.la. * libc/configure.in (AC_OUTPUT): Add search/Makefile. * libc/search: New directory. * libc/search/Makefile.am: New file. * libc/search/extern.h: New file. * libc/search/hash.c: New file. * libc/search/hash.h: New file. * libc/search/hash_bigkey.c: New file. * libc/search/hash_buf.c: New file. * libc/search/hash_func.c: New file. * libc/search/hash_log2.c: New file. * libc/search/hash_page.c: New file. * libc/search/hcreate.3: New file. * libc/search/hcreate.c: New file. * libc/search/hcreate.c~: New file. * libc/search/hcreate_r.c: New file. * libc/search/ndbm.c: New file. * libc/search/page.h: New file. * libc/search/tdelete.c: New file. * libc/search/tdestroy.c: New file. * libc/search/tfind.c: New file. * libc/search/tsearch.3: New file. * libc/search/tsearch.c: New file. * libc/search/twalk.c: New file. * libc/include/db.h: New file. * libc/include/ndbm.h: New file. * libc/include/search.h: New file. * libc/include/sys/queue.h: New file. * libc/include/sys/cdefs.h: New file. * libc/include/sys/param.h [__IEEE_LITTLE_ENDIAN,__IEEE_BIG_ENDIAN]: Set BYTE_ORDER to LITTLE_ENDIAN or BIG_ENDIAN. * libc/include/sys/errno.h (EFTYPE): New macro. * libc/search/bsearch.c: Move from libc/stdlib. * libc/search/qsort.c: Likewise. * libc/stdlib/Makefile.am (LIB_SOURCES): Remove bsearch.c and qsort.c. (CHEWOUT_FILES): Remove bsearch.def and qsort.def. * libc/stdlib/stdlib.tex: Remove references to bsearch and qsort.
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{
node_t **rootp = (node_t **)vrootp;
node_t *p, *q, *r;
int cmp;
if (rootp == NULL || (p = *rootp) == NULL)
return NULL;
while ((cmp = (*compar)(vkey, (*rootp)->key)) != 0) {
p = *rootp;
rootp = (cmp < 0) ?
&(*rootp)->llink : /* follow llink branch */
&(*rootp)->rlink; /* follow rlink branch */
if (*rootp == NULL)
return NULL; /* key not found */
}
r = (*rootp)->rlink; /* D1: */
if ((q = (*rootp)->llink) == NULL) /* Left NULL? */
q = r;
else if (r != NULL) { /* Right link is NULL? */
if (r->llink == NULL) { /* D2: Find successor */
r->llink = q;
q = r;
} else { /* D3: Find NULL link */
for (q = r->llink; q->llink != NULL; q = r->llink)
r = q;
r->llink = q->rlink;
q->llink = (*rootp)->llink;
q->rlink = (*rootp)->rlink;
}
}
free(*rootp); /* D4: Free node */
*rootp = q; /* link parent to new node */
return p;
}