From 875a2e681496b4017e26ade47f72921e62898143 Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Mon, 13 Feb 2006 07:19:48 +0000 Subject: Rename some files, that will conflict w/ IMA --- libc/misc/search/Makefile.in | 6 +- libc/misc/search/_hsearch_r.c | 232 ++++++++++++++++++++++++++++++++++++++++++ libc/misc/search/_lsearch.c | 51 ++++++++++ libc/misc/search/_tsearch.c | 223 ++++++++++++++++++++++++++++++++++++++++ libc/misc/search/hsearch_r.c | 232 ------------------------------------------ libc/misc/search/lsearch.c | 51 ---------- libc/misc/search/tsearch.c | 223 ---------------------------------------- 7 files changed, 509 insertions(+), 509 deletions(-) create mode 100644 libc/misc/search/_hsearch_r.c create mode 100644 libc/misc/search/_lsearch.c create mode 100644 libc/misc/search/_tsearch.c delete mode 100644 libc/misc/search/hsearch_r.c delete mode 100644 libc/misc/search/lsearch.c delete mode 100644 libc/misc/search/tsearch.c (limited to 'libc/misc/search') diff --git a/libc/misc/search/Makefile.in b/libc/misc/search/Makefile.in index 943ef34d0..fade671c9 100644 --- a/libc/misc/search/Makefile.in +++ b/libc/misc/search/Makefile.in @@ -6,16 +6,16 @@ # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. # -MSRC1:=tsearch.c +MSRC1:=_tsearch.c MOBJ1:=tsearch.o tfind.o tdelete.o twalk.o tdestroy.o -MSRC2:=lsearch.c +MSRC2:=_lsearch.c MOBJ2:=lfind.o lsearch.o MSRC3:=insremque.c MOBJ3:=insque.o remque.o -MSRC4:=hsearch_r.c +MSRC4:=_hsearch_r.c MOBJ4:=hcreate_r.o hdestroy_r.o hsearch_r.o CSRC:=hsearch.c diff --git a/libc/misc/search/_hsearch_r.c b/libc/misc/search/_hsearch_r.c new file mode 100644 index 000000000..a1cdbb681 --- /dev/null +++ b/libc/misc/search/_hsearch_r.c @@ -0,0 +1,232 @@ +/* Copyright (C) 1993, 1995, 1996, 1997, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1993. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include +#include + +#include + + +/* [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986 + [Knuth] The Art of Computer Programming, part 3 (6.4) */ + + +/* The reentrant version has no static variables to maintain the state. + Instead the interface of all functions is extended to take an argument + which describes the current status. */ +typedef struct _ENTRY +{ + unsigned int used; + ENTRY entry; +} +_ENTRY; + + +#ifdef L_hcreate_r + +/* For the used double hash method the table size has to be a prime. To + correct the user given table size we need a prime test. This trivial + algorithm is adequate because + a) the code is (most probably) called a few times per program run and + b) the number is small because the table must fit in the core */ +static int isprime (unsigned int number) +{ + /* no even number will be passed */ + unsigned int div = 3; + + while (div * div < number && number % div != 0) + div += 2; + + return number % div != 0; +} + + +/* Before using the hash table we must allocate memory for it. + Test for an existing table are done. We allocate one element + more as the found prime number says. This is done for more effective + indexing as explained in the comment for the hsearch function. + The contents of the table is zeroed, especially the field used + becomes zero. */ +libc_hidden_proto(hcreate_r) +int hcreate_r (size_t nel, struct hsearch_data *htab) +{ + /* Test for correct arguments. */ + if (htab == NULL) + { + __set_errno (EINVAL); + return 0; + } + + /* There is still another table active. Return with error. */ + if (htab->table != NULL) + return 0; + + /* Change nel to the first prime number not smaller as nel. */ + nel |= 1; /* make odd */ + while (!isprime (nel)) + nel += 2; + + htab->size = nel; + htab->filled = 0; + + /* allocate memory and zero out */ + htab->table = (_ENTRY *) calloc (htab->size + 1, sizeof (_ENTRY)); + if (htab->table == NULL) + return 0; + + /* everything went alright */ + return 1; +} +libc_hidden_def(hcreate_r) +#endif + +#ifdef L_hdestroy_r +/* After using the hash table it has to be destroyed. The used memory can + be freed and the local static variable can be marked as not used. */ +libc_hidden_proto(hdestroy_r) +void hdestroy_r (struct hsearch_data *htab) +{ + /* Test for correct arguments. */ + if (htab == NULL) + { + __set_errno (EINVAL); + return; + } + + if (htab->table != NULL) + /* free used memory */ + free (htab->table); + + /* the sign for an existing table is an value != NULL in htable */ + htab->table = NULL; +} +libc_hidden_def(hdestroy_r) +#endif + +#ifdef L_hsearch_r +/* This is the search function. It uses double hashing with open addressing. + The argument item.key has to be a pointer to an zero terminated, most + probably strings of chars. The function for generating a number of the + strings is simple but fast. It can be replaced by a more complex function + like ajw (see [Aho,Sethi,Ullman]) if the needs are shown. + + We use an trick to speed up the lookup. The table is created by hcreate + with one more element available. This enables us to use the index zero + special. This index will never be used because we store the first hash + index in the field used where zero means not used. Every other value + means used. The used field can be used as a first fast comparison for + equality of the stored and the parameter value. This helps to prevent + unnecessary expensive calls of strcmp. */ + +libc_hidden_proto(strcmp) +libc_hidden_proto(strlen) + +libc_hidden_proto(hsearch_r) +int hsearch_r (ENTRY item, ACTION action, ENTRY **retval, + struct hsearch_data *htab) +{ + unsigned int hval; + unsigned int count; + unsigned int len = strlen (item.key); + unsigned int idx; + + /* Compute an value for the given string. Perhaps use a better method. */ + hval = len; + count = len; + while (count-- > 0) + { + hval <<= 4; + hval += item.key[count]; + } + + /* First hash function: simply take the modul but prevent zero. */ + hval %= htab->size; + if (hval == 0) + ++hval; + + /* The first index tried. */ + idx = hval; + + if (htab->table[idx].used) + { + /* Further action might be required according to the action value. */ + unsigned hval2; + + if (htab->table[idx].used == hval + && strcmp (item.key, htab->table[idx].entry.key) == 0) + { + *retval = &htab->table[idx].entry; + return 1; + } + + /* Second hash function, as suggested in [Knuth] */ + hval2 = 1 + hval % (htab->size - 2); + + do + { + /* Because SIZE is prime this guarantees to step through all + available indeces. */ + if (idx <= hval2) + idx = htab->size + idx - hval2; + else + idx -= hval2; + + /* If we visited all entries leave the loop unsuccessfully. */ + if (idx == hval) + break; + + /* If entry is found use it. */ + if (htab->table[idx].used == hval + && strcmp (item.key, htab->table[idx].entry.key) == 0) + { + *retval = &htab->table[idx].entry; + return 1; + } + } + while (htab->table[idx].used); + } + + /* An empty bucket has been found. */ + if (action == ENTER) + { + /* If table is full and another entry should be entered return + with error. */ + if (htab->filled == htab->size) + { + __set_errno (ENOMEM); + *retval = NULL; + return 0; + } + + htab->table[idx].used = hval; + htab->table[idx].entry = item; + + ++htab->filled; + + *retval = &htab->table[idx].entry; + return 1; + } + + __set_errno (ESRCH); + *retval = NULL; + return 0; +} +libc_hidden_def(hsearch_r) +#endif diff --git a/libc/misc/search/_lsearch.c b/libc/misc/search/_lsearch.c new file mode 100644 index 000000000..eefef2121 --- /dev/null +++ b/libc/misc/search/_lsearch.c @@ -0,0 +1,51 @@ +/* + * This file lifted in toto from 'Dlibs' on the atari ST (RdeBath) + * + * + * Dale Schumacher 399 Beacon Ave. + * (alias: Dalnefre') St. Paul, MN 55104 + * dal@syntel.UUCP United States of America + * "It's not reality that's important, but how you perceive things." + */ + +#include +#include +#include + +libc_hidden_proto(lfind) + +#ifdef L_lfind + +void *lfind(const void *key, const void *base, size_t *nmemb, + size_t size, int (*compar)(const void *, const void *)) +{ + register int n = *nmemb; + + while (n--) { + if ((*compar) (base, key) == 0) + return ((void*)base); + base += size; + } + return (NULL); +} +libc_hidden_def(lfind) + +#endif + +#ifdef L_lsearch + +libc_hidden_proto(memcpy) + +void *lsearch(const void *key, void *base, size_t *nmemb, + size_t size, int (*compar)(const void *, const void *)) +{ + register char *p; + + if ((p = lfind(key, base, nmemb, size, compar)) == NULL) { + p = memcpy((base + (size * (*nmemb))), key, size); + ++(*nmemb); + } + return (p); +} + +#endif diff --git a/libc/misc/search/_tsearch.c b/libc/misc/search/_tsearch.c new file mode 100644 index 000000000..989710e08 --- /dev/null +++ b/libc/misc/search/_tsearch.c @@ -0,0 +1,223 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* + * 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. + */ +/*LINTLIBRARY*/ + +#include +#include + +/* This routine is not very bad. It makes many assumptions about + * the compiler. It assumpts that the first field in node must be + * the "key" field, which points to the datum. It is a very trick + * stuff. H.J. + */ + +typedef struct node_t +{ + void *key; + struct node_t *left, *right; +} node; + +#ifdef L_tsearch +/* find or insert datum into search tree. +char *key; key to be located +register node **rootp; address of tree root +int (*compar)(); ordering function +*/ + +libc_hidden_proto(tsearch) +void *tsearch(__const void *key, void **vrootp, __compar_fn_t compar) +{ + register node *q; + register node **rootp = (node **) vrootp; + + if (rootp == (struct node_t **)0) + return ((struct node_t *)0); + while (*rootp != (struct node_t *)0) /* Knuth's T1: */ + { + int r; + + if ((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */ + return (*rootp); /* we found it! */ + rootp = (r < 0) ? + &(*rootp)->left : /* T3: follow left branch */ + &(*rootp)->right; /* T4: follow right branch */ + } + q = (node *) malloc(sizeof(node)); /* T5: key not found */ + if (q != (struct node_t *)0) /* make new node */ + { + *rootp = q; /* link new node to old */ + q->key = (void *)key; /* initialize new node */ + q->left = q->right = (struct node_t *)0; + } + return (q); +} +libc_hidden_def(tsearch) +#endif + +#ifdef L_tfind +libc_hidden_proto(tfind) +void *tfind(__const void *key, void * __const *vrootp, __compar_fn_t compar) +{ + register node **rootp = (node **) vrootp; + + if (rootp == (struct node_t **)0) + return ((struct node_t *)0); + while (*rootp != (struct node_t *)0) /* Knuth's T1: */ + { + int r; + + if ((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */ + return (*rootp); /* we found it! */ + rootp = (r < 0) ? + &(*rootp)->left : /* T3: follow left branch */ + &(*rootp)->right; /* T4: follow right branch */ + } + return NULL; +} +libc_hidden_def(tfind) +#endif + +#ifdef L_tdelete +/* delete node with given key +char *key; key to be deleted +register node **rootp; address of the root of tree +int (*compar)(); comparison function +*/ +void *tdelete(__const void *key, void ** vrootp, __compar_fn_t compar) +{ + node *p; + register node *q; + register node *r; + int cmp; + register node **rootp = (node **) vrootp; + + if (rootp == (struct node_t **)0 || (p = *rootp) == (struct node_t *)0) + return ((struct node_t *)0); + while ((cmp = (*compar)(key, (*rootp)->key)) != 0) + { + p = *rootp; + rootp = (cmp < 0) ? + &(*rootp)->left : /* follow left branch */ + &(*rootp)->right; /* follow right branch */ + if (*rootp == (struct node_t *)0) + return ((struct node_t *)0); /* key not found */ + } + r = (*rootp)->right; /* D1: */ + if ((q = (*rootp)->left) == (struct node_t *)0) /* Left (struct node_t *)0? */ + q = r; + else if (r != (struct node_t *)0) /* Right link is null? */ + { + if (r->left == (struct node_t *)0) /* D2: Find successor */ + { + r->left = q; + q = r; + } + else + { /* D3: Find (struct node_t *)0 link */ + for (q = r->left; q->left != (struct node_t *)0; q = r->left) + r = q; + r->left = q->right; + q->left = (*rootp)->left; + q->right = (*rootp)->right; + } + } + free((struct node_t *) *rootp); /* D4: Free node */ + *rootp = q; /* link parent to new node */ + return(p); +} +#endif + +#ifdef L_twalk +/* Walk the nodes of a tree +register node *root; Root of the tree to be walked +register void (*action)(); Function to be called at each node +register int level; +*/ +static void trecurse(__const void *vroot, __action_fn_t action, int level) +{ + register node *root = (node *) vroot; + + if (root->left == (struct node_t *)0 && root->right == (struct node_t *)0) + (*action)(root, leaf, level); + else + { + (*action)(root, preorder, level); + if (root->left != (struct node_t *)0) + trecurse(root->left, action, level + 1); + (*action)(root, postorder, level); + if (root->right != (struct node_t *)0) + trecurse(root->right, action, level + 1); + (*action)(root, endorder, level); + } +} + +/* void twalk(root, action) Walk the nodes of a tree +node *root; Root of the tree to be walked +void (*action)(); Function to be called at each node +PTR +*/ +void twalk(__const void *vroot, __action_fn_t action) +{ + register __const node *root = (node *) vroot; + + if (root != (node *)0 && action != (__action_fn_t) 0) + trecurse(root, action, 0); +} +#endif + +#ifdef __USE_GNU +#ifdef L_tdestroy +/* The standardized functions miss an important functionality: the + tree cannot be removed easily. We provide a function to do this. */ +static void +internal_function +tdestroy_recurse (node *root, __free_fn_t freefct) +{ + if (root->left != NULL) + tdestroy_recurse (root->left, freefct); + if (root->right != NULL) + tdestroy_recurse (root->right, freefct); + (*freefct) ((void *) root->key); + /* Free the node itself. */ + free (root); +} + +libc_hidden_proto(tdestroy) +void tdestroy (void *vroot, __free_fn_t freefct) +{ + node *root = (node *) vroot; + if (root != NULL) { + tdestroy_recurse (root, freefct); + } +} +libc_hidden_def(tdestroy) +#endif +#endif + +/* tsearch.c ends here */ diff --git a/libc/misc/search/hsearch_r.c b/libc/misc/search/hsearch_r.c deleted file mode 100644 index a1cdbb681..000000000 --- a/libc/misc/search/hsearch_r.c +++ /dev/null @@ -1,232 +0,0 @@ -/* Copyright (C) 1993, 1995, 1996, 1997, 2002 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper , 1993. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include -#include -#include - -#include - - -/* [Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986 - [Knuth] The Art of Computer Programming, part 3 (6.4) */ - - -/* The reentrant version has no static variables to maintain the state. - Instead the interface of all functions is extended to take an argument - which describes the current status. */ -typedef struct _ENTRY -{ - unsigned int used; - ENTRY entry; -} -_ENTRY; - - -#ifdef L_hcreate_r - -/* For the used double hash method the table size has to be a prime. To - correct the user given table size we need a prime test. This trivial - algorithm is adequate because - a) the code is (most probably) called a few times per program run and - b) the number is small because the table must fit in the core */ -static int isprime (unsigned int number) -{ - /* no even number will be passed */ - unsigned int div = 3; - - while (div * div < number && number % div != 0) - div += 2; - - return number % div != 0; -} - - -/* Before using the hash table we must allocate memory for it. - Test for an existing table are done. We allocate one element - more as the found prime number says. This is done for more effective - indexing as explained in the comment for the hsearch function. - The contents of the table is zeroed, especially the field used - becomes zero. */ -libc_hidden_proto(hcreate_r) -int hcreate_r (size_t nel, struct hsearch_data *htab) -{ - /* Test for correct arguments. */ - if (htab == NULL) - { - __set_errno (EINVAL); - return 0; - } - - /* There is still another table active. Return with error. */ - if (htab->table != NULL) - return 0; - - /* Change nel to the first prime number not smaller as nel. */ - nel |= 1; /* make odd */ - while (!isprime (nel)) - nel += 2; - - htab->size = nel; - htab->filled = 0; - - /* allocate memory and zero out */ - htab->table = (_ENTRY *) calloc (htab->size + 1, sizeof (_ENTRY)); - if (htab->table == NULL) - return 0; - - /* everything went alright */ - return 1; -} -libc_hidden_def(hcreate_r) -#endif - -#ifdef L_hdestroy_r -/* After using the hash table it has to be destroyed. The used memory can - be freed and the local static variable can be marked as not used. */ -libc_hidden_proto(hdestroy_r) -void hdestroy_r (struct hsearch_data *htab) -{ - /* Test for correct arguments. */ - if (htab == NULL) - { - __set_errno (EINVAL); - return; - } - - if (htab->table != NULL) - /* free used memory */ - free (htab->table); - - /* the sign for an existing table is an value != NULL in htable */ - htab->table = NULL; -} -libc_hidden_def(hdestroy_r) -#endif - -#ifdef L_hsearch_r -/* This is the search function. It uses double hashing with open addressing. - The argument item.key has to be a pointer to an zero terminated, most - probably strings of chars. The function for generating a number of the - strings is simple but fast. It can be replaced by a more complex function - like ajw (see [Aho,Sethi,Ullman]) if the needs are shown. - - We use an trick to speed up the lookup. The table is created by hcreate - with one more element available. This enables us to use the index zero - special. This index will never be used because we store the first hash - index in the field used where zero means not used. Every other value - means used. The used field can be used as a first fast comparison for - equality of the stored and the parameter value. This helps to prevent - unnecessary expensive calls of strcmp. */ - -libc_hidden_proto(strcmp) -libc_hidden_proto(strlen) - -libc_hidden_proto(hsearch_r) -int hsearch_r (ENTRY item, ACTION action, ENTRY **retval, - struct hsearch_data *htab) -{ - unsigned int hval; - unsigned int count; - unsigned int len = strlen (item.key); - unsigned int idx; - - /* Compute an value for the given string. Perhaps use a better method. */ - hval = len; - count = len; - while (count-- > 0) - { - hval <<= 4; - hval += item.key[count]; - } - - /* First hash function: simply take the modul but prevent zero. */ - hval %= htab->size; - if (hval == 0) - ++hval; - - /* The first index tried. */ - idx = hval; - - if (htab->table[idx].used) - { - /* Further action might be required according to the action value. */ - unsigned hval2; - - if (htab->table[idx].used == hval - && strcmp (item.key, htab->table[idx].entry.key) == 0) - { - *retval = &htab->table[idx].entry; - return 1; - } - - /* Second hash function, as suggested in [Knuth] */ - hval2 = 1 + hval % (htab->size - 2); - - do - { - /* Because SIZE is prime this guarantees to step through all - available indeces. */ - if (idx <= hval2) - idx = htab->size + idx - hval2; - else - idx -= hval2; - - /* If we visited all entries leave the loop unsuccessfully. */ - if (idx == hval) - break; - - /* If entry is found use it. */ - if (htab->table[idx].used == hval - && strcmp (item.key, htab->table[idx].entry.key) == 0) - { - *retval = &htab->table[idx].entry; - return 1; - } - } - while (htab->table[idx].used); - } - - /* An empty bucket has been found. */ - if (action == ENTER) - { - /* If table is full and another entry should be entered return - with error. */ - if (htab->filled == htab->size) - { - __set_errno (ENOMEM); - *retval = NULL; - return 0; - } - - htab->table[idx].used = hval; - htab->table[idx].entry = item; - - ++htab->filled; - - *retval = &htab->table[idx].entry; - return 1; - } - - __set_errno (ESRCH); - *retval = NULL; - return 0; -} -libc_hidden_def(hsearch_r) -#endif diff --git a/libc/misc/search/lsearch.c b/libc/misc/search/lsearch.c deleted file mode 100644 index eefef2121..000000000 --- a/libc/misc/search/lsearch.c +++ /dev/null @@ -1,51 +0,0 @@ -/* - * This file lifted in toto from 'Dlibs' on the atari ST (RdeBath) - * - * - * Dale Schumacher 399 Beacon Ave. - * (alias: Dalnefre') St. Paul, MN 55104 - * dal@syntel.UUCP United States of America - * "It's not reality that's important, but how you perceive things." - */ - -#include -#include -#include - -libc_hidden_proto(lfind) - -#ifdef L_lfind - -void *lfind(const void *key, const void *base, size_t *nmemb, - size_t size, int (*compar)(const void *, const void *)) -{ - register int n = *nmemb; - - while (n--) { - if ((*compar) (base, key) == 0) - return ((void*)base); - base += size; - } - return (NULL); -} -libc_hidden_def(lfind) - -#endif - -#ifdef L_lsearch - -libc_hidden_proto(memcpy) - -void *lsearch(const void *key, void *base, size_t *nmemb, - size_t size, int (*compar)(const void *, const void *)) -{ - register char *p; - - if ((p = lfind(key, base, nmemb, size, compar)) == NULL) { - p = memcpy((base + (size * (*nmemb))), key, size); - ++(*nmemb); - } - return (p); -} - -#endif diff --git a/libc/misc/search/tsearch.c b/libc/misc/search/tsearch.c deleted file mode 100644 index 989710e08..000000000 --- a/libc/misc/search/tsearch.c +++ /dev/null @@ -1,223 +0,0 @@ -/* Copyright (C) 1994 Free Software Foundation, Inc. -This file is part of the GNU C Library. - -The GNU C Library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. - -The GNU C Library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ - -/* - * 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. - */ -/*LINTLIBRARY*/ - -#include -#include - -/* This routine is not very bad. It makes many assumptions about - * the compiler. It assumpts that the first field in node must be - * the "key" field, which points to the datum. It is a very trick - * stuff. H.J. - */ - -typedef struct node_t -{ - void *key; - struct node_t *left, *right; -} node; - -#ifdef L_tsearch -/* find or insert datum into search tree. -char *key; key to be located -register node **rootp; address of tree root -int (*compar)(); ordering function -*/ - -libc_hidden_proto(tsearch) -void *tsearch(__const void *key, void **vrootp, __compar_fn_t compar) -{ - register node *q; - register node **rootp = (node **) vrootp; - - if (rootp == (struct node_t **)0) - return ((struct node_t *)0); - while (*rootp != (struct node_t *)0) /* Knuth's T1: */ - { - int r; - - if ((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */ - return (*rootp); /* we found it! */ - rootp = (r < 0) ? - &(*rootp)->left : /* T3: follow left branch */ - &(*rootp)->right; /* T4: follow right branch */ - } - q = (node *) malloc(sizeof(node)); /* T5: key not found */ - if (q != (struct node_t *)0) /* make new node */ - { - *rootp = q; /* link new node to old */ - q->key = (void *)key; /* initialize new node */ - q->left = q->right = (struct node_t *)0; - } - return (q); -} -libc_hidden_def(tsearch) -#endif - -#ifdef L_tfind -libc_hidden_proto(tfind) -void *tfind(__const void *key, void * __const *vrootp, __compar_fn_t compar) -{ - register node **rootp = (node **) vrootp; - - if (rootp == (struct node_t **)0) - return ((struct node_t *)0); - while (*rootp != (struct node_t *)0) /* Knuth's T1: */ - { - int r; - - if ((r = (*compar)(key, (*rootp)->key)) == 0) /* T2: */ - return (*rootp); /* we found it! */ - rootp = (r < 0) ? - &(*rootp)->left : /* T3: follow left branch */ - &(*rootp)->right; /* T4: follow right branch */ - } - return NULL; -} -libc_hidden_def(tfind) -#endif - -#ifdef L_tdelete -/* delete node with given key -char *key; key to be deleted -register node **rootp; address of the root of tree -int (*compar)(); comparison function -*/ -void *tdelete(__const void *key, void ** vrootp, __compar_fn_t compar) -{ - node *p; - register node *q; - register node *r; - int cmp; - register node **rootp = (node **) vrootp; - - if (rootp == (struct node_t **)0 || (p = *rootp) == (struct node_t *)0) - return ((struct node_t *)0); - while ((cmp = (*compar)(key, (*rootp)->key)) != 0) - { - p = *rootp; - rootp = (cmp < 0) ? - &(*rootp)->left : /* follow left branch */ - &(*rootp)->right; /* follow right branch */ - if (*rootp == (struct node_t *)0) - return ((struct node_t *)0); /* key not found */ - } - r = (*rootp)->right; /* D1: */ - if ((q = (*rootp)->left) == (struct node_t *)0) /* Left (struct node_t *)0? */ - q = r; - else if (r != (struct node_t *)0) /* Right link is null? */ - { - if (r->left == (struct node_t *)0) /* D2: Find successor */ - { - r->left = q; - q = r; - } - else - { /* D3: Find (struct node_t *)0 link */ - for (q = r->left; q->left != (struct node_t *)0; q = r->left) - r = q; - r->left = q->right; - q->left = (*rootp)->left; - q->right = (*rootp)->right; - } - } - free((struct node_t *) *rootp); /* D4: Free node */ - *rootp = q; /* link parent to new node */ - return(p); -} -#endif - -#ifdef L_twalk -/* Walk the nodes of a tree -register node *root; Root of the tree to be walked -register void (*action)(); Function to be called at each node -register int level; -*/ -static void trecurse(__const void *vroot, __action_fn_t action, int level) -{ - register node *root = (node *) vroot; - - if (root->left == (struct node_t *)0 && root->right == (struct node_t *)0) - (*action)(root, leaf, level); - else - { - (*action)(root, preorder, level); - if (root->left != (struct node_t *)0) - trecurse(root->left, action, level + 1); - (*action)(root, postorder, level); - if (root->right != (struct node_t *)0) - trecurse(root->right, action, level + 1); - (*action)(root, endorder, level); - } -} - -/* void twalk(root, action) Walk the nodes of a tree -node *root; Root of the tree to be walked -void (*action)(); Function to be called at each node -PTR -*/ -void twalk(__const void *vroot, __action_fn_t action) -{ - register __const node *root = (node *) vroot; - - if (root != (node *)0 && action != (__action_fn_t) 0) - trecurse(root, action, 0); -} -#endif - -#ifdef __USE_GNU -#ifdef L_tdestroy -/* The standardized functions miss an important functionality: the - tree cannot be removed easily. We provide a function to do this. */ -static void -internal_function -tdestroy_recurse (node *root, __free_fn_t freefct) -{ - if (root->left != NULL) - tdestroy_recurse (root->left, freefct); - if (root->right != NULL) - tdestroy_recurse (root->right, freefct); - (*freefct) ((void *) root->key); - /* Free the node itself. */ - free (root); -} - -libc_hidden_proto(tdestroy) -void tdestroy (void *vroot, __free_fn_t freefct) -{ - node *root = (node *) vroot; - if (root != NULL) { - tdestroy_recurse (root, freefct); - } -} -libc_hidden_def(tdestroy) -#endif -#endif - -/* tsearch.c ends here */ -- cgit v1.2.3