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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:37:15 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:37:15 +0000
commitae5d181b854d3ccb373b6bc01b4869e44ff4d87a (patch)
tree91f59efb48c56a84cc798e012fccb667b63d3fee /WWW/Library/Implementation/HTAtom.c
parentInitial commit. (diff)
downloadlynx-ae5d181b854d3ccb373b6bc01b4869e44ff4d87a.tar.xz
lynx-ae5d181b854d3ccb373b6bc01b4869e44ff4d87a.zip
Adding upstream version 2.9.0dev.12.upstream/2.9.0dev.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'WWW/Library/Implementation/HTAtom.c')
-rw-r--r--WWW/Library/Implementation/HTAtom.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/WWW/Library/Implementation/HTAtom.c b/WWW/Library/Implementation/HTAtom.c
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+++ b/WWW/Library/Implementation/HTAtom.c
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+/*
+ * $LynxId: HTAtom.c,v 1.22 2018/03/06 09:46:58 tom Exp $
+ *
+ * Atoms: Names to numbers HTAtom.c
+ * =======================
+ *
+ * Atoms are names which are given representative pointer values
+ * so that they can be stored more efficiently, and comparisons
+ * for equality done more efficiently.
+ *
+ * Atoms are kept in a hash table consisting of an array of linked lists.
+ *
+ * Authors:
+ * TBL Tim Berners-Lee, WorldWideWeb project, CERN
+ * (c) Copyright CERN 1991 - See Copyright.html
+ *
+ */
+
+#include <HTUtils.h>
+#include <HTAtom.h>
+#include <HTList.h>
+#include <LYexit.h>
+#include <LYLeaks.h>
+
+#define HASH_SIZE 101 /* Arbitrary prime. Memory/speed tradeoff */
+
+static HTAtom *hash_table[HASH_SIZE];
+static BOOL initialised = NO;
+
+/*
+ * To free off all atoms.
+ */
+#ifdef LY_FIND_LEAKS
+static void free_atoms(void);
+#endif
+
+#define HASH_FUNCTION(cp_hash) ((strlen(cp_hash) * UCH(*cp_hash)) % HASH_SIZE)
+
+HTAtom *HTAtom_for(const char *string)
+{
+ size_t hash;
+ HTAtom *a;
+
+ if (!initialised) {
+ memset(hash_table, 0, sizeof(hash_table));
+ initialised = YES;
+#ifdef LY_FIND_LEAKS
+ atexit(free_atoms);
+#endif
+ }
+
+ hash = HASH_FUNCTION(string);
+
+ for (a = hash_table[hash]; a; a = a->next) {
+ if (0 == strcasecomp(a->name, string)) {
+ return a;
+ }
+ }
+
+ a = (HTAtom *) malloc(sizeof(*a));
+ if (a == NULL)
+ outofmem(__FILE__, "HTAtom_for");
+
+ a->name = (char *) malloc(strlen(string) + 1);
+ if (a->name == NULL)
+ outofmem(__FILE__, "HTAtom_for");
+
+ strcpy(a->name, string);
+ a->next = hash_table[hash];
+ hash_table[hash] = a;
+ return a;
+}
+
+#ifdef LY_FIND_LEAKS
+/*
+ * Purpose: Free off all atoms.
+ * Arguments: void
+ * Return Value: void
+ * Remarks/Portability/Dependencies/Restrictions:
+ * To be used at program exit.
+ * Revision History:
+ * 05-29-94 created Lynx 2-3-1 Garrett Arch Blythe
+ */
+static void free_atoms(void)
+{
+ auto int i_counter;
+ HTAtom *HTAp_freeme;
+
+ /*
+ * Loop through all lists of atoms.
+ */
+ for (i_counter = 0; i_counter < HASH_SIZE; i_counter++) {
+ /*
+ * Loop through the list.
+ */
+ while (hash_table[i_counter] != NULL) {
+ /*
+ * Free off atoms and any members.
+ */
+ HTAp_freeme = hash_table[i_counter];
+ hash_table[i_counter] = HTAp_freeme->next;
+ FREE(HTAp_freeme->name);
+ FREE(HTAp_freeme);
+ }
+ }
+}
+#endif /* LY_FIND_LEAKS */