Imported Upstream version 5.9.5upstream/5.9.5

1 files changed, 578 insertions, 0 deletions

diff --git a/st.c b/st.c
new file mode 100644
index 0000000..022880a
--- /dev/null
+++ b/st.c
@@ -0,0 +1,578 @@
+/* This is a public domain general purpose hash table package written by Peter Moore @ UCB. */
+
+/* static	char	sccsid[] = "@(#) st.c 5.1 89/12/14 Crucible"; */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _WIN32
+#include <malloc.h>
+#endif
+
+#include "regint.h"
+#include "st.h"
+
+typedef struct st_table_entry st_table_entry;
+
+struct st_table_entry {
+    unsigned int hash;
+    st_data_t key;
+    st_data_t record;
+    st_table_entry *next;
+};
+
+#define ST_DEFAULT_MAX_DENSITY 5
+#define ST_DEFAULT_INIT_TABLE_SIZE 11
+
+    /*
+     * DEFAULT_MAX_DENSITY is the default for the largest we allow the
+     * average number of items per bin before increasing the number of
+     * bins
+     *
+     * DEFAULT_INIT_TABLE_SIZE is the default for the number of bins
+     * allocated initially
+     *
+     */
+
+static int numcmp(long, long);
+static int numhash(long);
+static struct st_hash_type type_numhash = {
+    numcmp,
+    numhash,
+};
+
+/* extern int strcmp(const char *, const char *); */
+static int strhash(const char *);
+static struct st_hash_type type_strhash = {
+    strcmp,
+    strhash,
+};
+
+static void rehash(st_table *);
+
+#define alloc(type) (type*)xmalloc((unsigned)sizeof(type))
+#define Calloc(n,s) (char*)xcalloc((n),(s))
+
+#define EQUAL(table,x,y) ((x)==(y) || (*table->type->compare)((x),(y)) == 0)
+
+#define do_hash(key,table) (unsigned int)(*(table)->type->hash)((key))
+#define do_hash_bin(key,table) (do_hash(key, table)%(table)->num_bins)
+
+/*
+ * MINSIZE is the minimum size of a dictionary.
+ */
+
+#define MINSIZE 8
+
+/*
+Table of prime numbers 2^n+a, 2<=n<=30.
+*/
+static const long primes[] = {
+	8 + 3,
+	16 + 3,
+	32 + 5,
+	64 + 3,
+	128 + 3,
+	256 + 27,
+	512 + 9,
+	1024 + 9,
+	2048 + 5,
+	4096 + 3,
+	8192 + 27,
+	16384 + 43,
+	32768 + 3,
+	65536 + 45,
+	131072 + 29,
+	262144 + 3,
+	524288 + 21,
+	1048576 + 7,
+	2097152 + 17,
+	4194304 + 15,
+	8388608 + 9,
+	16777216 + 43,
+	33554432 + 35,
+	67108864 + 15,
+	134217728 + 29,
+	268435456 + 3,
+	536870912 + 11,
+	1073741824 + 85,
+	0
+};
+
+static int
+new_size(size)
+    int size;
+{
+    int i;
+
+#if 0
+    for (i=3; i<31; i++) {
+	if ((1<<i) > size) return 1<<i;
+    }
+    return -1;
+#else
+    int newsize;
+
+    for (i = 0, newsize = MINSIZE;
+	 i < (int )(sizeof(primes)/sizeof(primes[0]));
+	 i++, newsize <<= 1)
+    {
+	if (newsize > size) return primes[i];
+    }
+    /* Ran out of polynomials */
+    return -1;			/* should raise exception */
+#endif
+}
+
+#ifdef HASH_LOG
+static int collision = 0;
+static int init_st = 0;
+
+static void
+stat_col()
+{
+    FILE *f = fopen("/tmp/col", "w");
+    fprintf(f, "collision: %d\n", collision);
+    fclose(f);
+}
+#endif
+
+st_table*
+st_init_table_with_size(type, size)
+    struct st_hash_type *type;
+    int size;
+{
+    st_table *tbl;
+
+#ifdef HASH_LOG
+    if (init_st == 0) {
+	init_st = 1;
+	atexit(stat_col);
+    }
+#endif
+
+    size = new_size(size);	/* round up to prime number */
+
+    tbl = alloc(st_table);
+    tbl->type = type;
+    tbl->num_entries = 0;
+    tbl->num_bins = size;
+    tbl->bins = (st_table_entry **)Calloc(size, sizeof(st_table_entry*));
+
+    return tbl;
+}
+
+st_table*
+st_init_table(type)
+    struct st_hash_type *type;
+{
+    return st_init_table_with_size(type, 0);
+}
+
+st_table*
+st_init_numtable(void)
+{
+    return st_init_table(&type_numhash);
+}
+
+st_table*
+st_init_numtable_with_size(size)
+    int size;
+{
+    return st_init_table_with_size(&type_numhash, size);
+}
+
+st_table*
+st_init_strtable(void)
+{
+    return st_init_table(&type_strhash);
+}
+
+st_table*
+st_init_strtable_with_size(size)
+    int size;
+{
+    return st_init_table_with_size(&type_strhash, size);
+}
+
+void
+st_free_table(table)
+    st_table *table;
+{
+    register st_table_entry *ptr, *next;
+    int i;
+
+    for(i = 0; i < table->num_bins; i++) {
+	ptr = table->bins[i];
+	while (ptr != 0) {
+	    next = ptr->next;
+	    free(ptr);
+	    ptr = next;
+	}
+    }
+    free(table->bins);
+    free(table);
+}
+
+#define PTR_NOT_EQUAL(table, ptr, hash_val, key) \
+((ptr) != 0 && (ptr->hash != (hash_val) || !EQUAL((table), (key), (ptr)->key)))
+
+#ifdef HASH_LOG
+#define COLLISION collision++
+#else
+#define COLLISION
+#endif
+
+#define FIND_ENTRY(table, ptr, hash_val, bin_pos) do {\
+    bin_pos = hash_val%(table)->num_bins;\
+    ptr = (table)->bins[bin_pos];\
+    if (PTR_NOT_EQUAL(table, ptr, hash_val, key)) {\
+	COLLISION;\
+	while (PTR_NOT_EQUAL(table, ptr->next, hash_val, key)) {\
+	    ptr = ptr->next;\
+	}\
+	ptr = ptr->next;\
+    }\
+} while (0)
+
+int
+st_lookup(table, key, value)
+    st_table *table;
+    register st_data_t key;
+    st_data_t *value;
+{
+    unsigned int hash_val, bin_pos;
+    register st_table_entry *ptr;
+
+    hash_val = do_hash(key, table);
+    FIND_ENTRY(table, ptr, hash_val, bin_pos);
+
+    if (ptr == 0) {
+	return 0;
+    }
+    else {
+	if (value != 0)  *value = ptr->record;
+	return 1;
+    }
+}
+
+#define ADD_DIRECT(table, key, value, hash_val, bin_pos)\
+do {\
+    st_table_entry *entry;\
+    if (table->num_entries/(table->num_bins) > ST_DEFAULT_MAX_DENSITY) {\
+	rehash(table);\
+        bin_pos = hash_val % table->num_bins;\
+    }\
+    \
+    entry = alloc(st_table_entry);\
+    \
+    entry->hash = hash_val;\
+    entry->key = key;\
+    entry->record = value;\
+    entry->next = table->bins[bin_pos];\
+    table->bins[bin_pos] = entry;\
+    table->num_entries++;\
+} while (0)
+
+int
+st_insert(table, key, value)
+    register st_table *table;
+    register st_data_t key;
+    st_data_t value;
+{
+    unsigned int hash_val, bin_pos;
+    register st_table_entry *ptr;
+
+    hash_val = do_hash(key, table);
+    FIND_ENTRY(table, ptr, hash_val, bin_pos);
+
+    if (ptr == 0) {
+	ADD_DIRECT(table, key, value, hash_val, bin_pos);
+	return 0;
+    }
+    else {
+	ptr->record = value;
+	return 1;
+    }
+}
+
+void
+st_add_direct(table, key, value)
+    st_table *table;
+    st_data_t key;
+    st_data_t value;
+{
+    unsigned int hash_val, bin_pos;
+
+    hash_val = do_hash(key, table);
+    bin_pos = hash_val % table->num_bins;
+    ADD_DIRECT(table, key, value, hash_val, bin_pos);
+}
+
+static void
+rehash(table)
+    register st_table *table;
+{
+    register st_table_entry *ptr, *next, **new_bins;
+    int i, old_num_bins = table->num_bins, new_num_bins;
+    unsigned int hash_val;
+
+    new_num_bins = new_size(old_num_bins+1);
+    new_bins = (st_table_entry**)Calloc(new_num_bins, sizeof(st_table_entry*));
+
+    for(i = 0; i < old_num_bins; i++) {
+	ptr = table->bins[i];
+	while (ptr != 0) {
+	    next = ptr->next;
+	    hash_val = ptr->hash % new_num_bins;
+	    ptr->next = new_bins[hash_val];
+	    new_bins[hash_val] = ptr;
+	    ptr = next;
+	}
+    }
+    free(table->bins);
+    table->num_bins = new_num_bins;
+    table->bins = new_bins;
+}
+
+st_table*
+st_copy(old_table)
+    st_table *old_table;
+{
+    st_table *new_table;
+    st_table_entry *ptr, *entry;
+    int i, num_bins = old_table->num_bins;
+
+    new_table = alloc(st_table);
+    if (new_table == 0) {
+	return 0;
+    }
+
+    *new_table = *old_table;
+    new_table->bins = (st_table_entry**)
+	Calloc((unsigned)num_bins, sizeof(st_table_entry*));
+
+    if (new_table->bins == 0) {
+	free(new_table);
+	return 0;
+    }
+
+    for(i = 0; i < num_bins; i++) {
+	new_table->bins[i] = 0;
+	ptr = old_table->bins[i];
+	while (ptr != 0) {
+	    entry = alloc(st_table_entry);
+	    if (entry == 0) {
+		free(new_table->bins);
+		free(new_table);
+		return 0;
+	    }
+	    *entry = *ptr;
+	    entry->next = new_table->bins[i];
+	    new_table->bins[i] = entry;
+	    ptr = ptr->next;
+	}
+    }
+    return new_table;
+}
+
+int
+st_delete(table, key, value)
+    register st_table *table;
+    register st_data_t *key;
+    st_data_t *value;
+{
+    unsigned int hash_val;
+    st_table_entry *tmp;
+    register st_table_entry *ptr;
+
+    hash_val = do_hash_bin(*key, table);
+    ptr = table->bins[hash_val];
+
+    if (ptr == 0) {
+	if (value != 0) *value = 0;
+	return 0;
+    }
+
+    if (EQUAL(table, *key, ptr->key)) {
+	table->bins[hash_val] = ptr->next;
+	table->num_entries--;
+	if (value != 0) *value = ptr->record;
+	*key = ptr->key;
+	free(ptr);
+	return 1;
+    }
+
+    for(; ptr->next != 0; ptr = ptr->next) {
+	if (EQUAL(table, ptr->next->key, *key)) {
+	    tmp = ptr->next;
+	    ptr->next = ptr->next->next;
+	    table->num_entries--;
+	    if (value != 0) *value = tmp->record;
+	    *key = tmp->key;
+	    free(tmp);
+	    return 1;
+	}
+    }
+
+    return 0;
+}
+
+int
+st_delete_safe(table, key, value, never)
+    register st_table *table;
+    register st_data_t *key;
+    st_data_t *value;
+    st_data_t never;
+{
+    unsigned int hash_val;
+    register st_table_entry *ptr;
+
+    hash_val = do_hash_bin(*key, table);
+    ptr = table->bins[hash_val];
+
+    if (ptr == 0) {
+	if (value != 0) *value = 0;
+	return 0;
+    }
+
+    for(; ptr != 0; ptr = ptr->next) {
+	if ((ptr->key != never) && EQUAL(table, ptr->key, *key)) {
+	    table->num_entries--;
+	    *key = ptr->key;
+	    if (value != 0) *value = ptr->record;
+	    ptr->key = ptr->record = never;
+	    return 1;
+	}
+    }
+
+    return 0;
+}
+
+static int
+#if defined(__GNUC__)
+delete_never(st_data_t key __attribute__ ((unused)), st_data_t value,
+	     st_data_t never)
+#else
+delete_never(key, value, never)
+    st_data_t key, value, never;
+#endif
+{
+    if (value == never) return ST_DELETE;
+    return ST_CONTINUE;
+}
+
+void
+st_cleanup_safe(table, never)
+    st_table *table;
+    st_data_t never;
+{
+    int num_entries = table->num_entries;
+
+    st_foreach(table, delete_never, never);
+    table->num_entries = num_entries;
+}
+
+int
+st_foreach(table, func, arg)
+    st_table *table;
+    int (*func)();
+    st_data_t arg;
+{
+    st_table_entry *ptr, *last, *tmp;
+    enum st_retval retval;
+    int i;
+
+    for(i = 0; i < table->num_bins; i++) {
+	last = 0;
+	for(ptr = table->bins[i]; ptr != 0;) {
+	    retval = (*func)(ptr->key, ptr->record, arg);
+	    switch (retval) {
+	    case ST_CHECK:	/* check if hash is modified during iteration */
+	        tmp = 0;
+		if (i < table->num_bins) {
+		    for (tmp = table->bins[i]; tmp; tmp=tmp->next) {
+			if (tmp == ptr) break;
+		    }
+		}
+		if (!tmp) {
+		    /* call func with error notice */
+		    return 1;
+		}
+		/* fall through */
+	    case ST_CONTINUE:
+		last = ptr;
+		ptr = ptr->next;
+		break;
+	    case ST_STOP:
+	        return 0;
+	    case ST_DELETE:
+		tmp = ptr;
+		if (last == 0) {
+		    table->bins[i] = ptr->next;
+		}
+		else {
+		    last->next = ptr->next;
+		}
+		ptr = ptr->next;
+		free(tmp);
+		table->num_entries--;
+	    }
+	}
+    }
+    return 0;
+}
+
+static int
+strhash(string)
+    register const char *string;
+{
+    register int c;
+
+#ifdef HASH_ELFHASH
+    register unsigned int h = 0, g;
+
+    while ((c = *string++) != '\0') {
+	h = ( h << 4 ) + c;
+	if ( g = h & 0xF0000000 )
+	    h ^= g >> 24;
+	h &= ~g;
+    }
+    return h;
+#elif HASH_PERL
+    register int val = 0;
+
+    while ((c = *string++) != '\0') {
+	val += c;
+	val += (val << 10);
+	val ^= (val >> 6);
+    }
+    val += (val << 3);
+    val ^= (val >> 11);
+
+    return val + (val << 15);
+#else
+    register int val = 0;
+
+    while ((c = *string++) != '\0') {
+	val = val*997 + c;
+    }
+
+    return val + (val>>5);
+#endif
+}
+
+static int
+numcmp(x, y)
+    long x, y;
+{
+    return x != y;
+}
+
+static int
+numhash(n)
+    long n;
+{
+    return n;
+}