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/* This file is part of the Project Athena Zephyr Notification System.
* It contains the main loop of the Zephyr server
*
* Created by: Lucien W. Van Elsen
*
* $Id$
*
* Copyright (c) 1991 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <zephyr/mit-copyright.h>
#include "zserver.h"
#ifndef lint
#ifndef SABER
static const char rcsid_zstring_c[] =
"$Id$";
#endif
#endif
static String *zhash[STRING_HASH_TABLE_SIZE];
static int
valid_utf8_p(const char* s)
{
ssize_t len;
int32_t uc;
while ((len = utf8proc_iterate((const unsigned char *)s, -1, &uc))) {
if (len <=0) return 0; /* Not valid UTF-8 encoding. */
if (!(utf8proc_codepoint_valid(uc))) return 0; /* Not valid unicode codepoint. */
if (uc == 0) return 1; /* NULL, we're done. */
s += len;
}
return 0; /* We shouldn't get here. */
}
static char *zdowncase(const char* s)
{
unsigned char *new_s_u; /* Avoid strict aliasing violation */
char *new_s, *p;
if (valid_utf8_p(s)) {
/* Use utf8proc if we're dealing with UTF-8.
* Rather than downcase, casefold and normalize to NFKC.
*/
utf8proc_map((const unsigned char *)s, 0, (unsigned char **)&new_s_u,
UTF8PROC_NULLTERM | UTF8PROC_STABLE
| UTF8PROC_CASEFOLD | UTF8PROC_COMPAT
| UTF8PROC_COMPOSE);
new_s = (char *)new_s_u;
} else {
/* If not, fall back to old methods. */
new_s = strsave(s);
p = new_s;
while(*p) {
if (isascii(*p) && isupper(*p))
*p = tolower(*p);
p++;
}
}
return new_s;
}
String *
make_string(char *s,
int downcase)
{
char *new_s;
String *new_z,*hp;
int i;
if (downcase) {
new_s = zdowncase(s);
} else {
new_s = s;
}
new_z = find_string(new_s,0);
if (new_z != NULL) {
if (downcase)
free(new_s);
new_z->ref_count++;
return(new_z);
}
/* Initialize new String */
if (!downcase)
new_s = strsave(s);
new_z = (String *) malloc(sizeof(String));
new_z->string = new_s;
new_z->ref_count = 1;
/* Add to beginning of hash table */
new_z->hash_val = hash(new_s);
i = new_z->hash_val % STRING_HASH_TABLE_SIZE;
hp = zhash[i];
new_z->next = hp;
if (hp != NULL)
hp->prev = new_z;
new_z->prev = NULL;
zhash[i] = new_z;
return new_z;
}
void
free_string(String *z)
{
if (z == (String *) NULL)
return;
z->ref_count--;
if (z->ref_count > 0)
return;
/* delete string completely */
if(z->prev == NULL)
zhash[hash(z->string) % STRING_HASH_TABLE_SIZE] = z->next;
else
z->prev->next = z->next;
if (z->next != NULL)
z->next->prev = z->prev;
free(z->string);
free(z);
}
String *
find_string(char *s,
int downcase)
{
char *new_s;
String *z;
if (downcase) {
new_s = zdowncase(s);
} else {
new_s = s;
}
z = zhash[hash(new_s) % STRING_HASH_TABLE_SIZE];
while (z != NULL) {
if (strcmp(new_s, z->string) == 0)
break;
z = z->next;
}
if (downcase)
free(new_s);
return z;
}
int
comp_string(String *a,
String *b)
{
if (a->hash_val > b->hash_val)
return 1;
if (a->hash_val < b->hash_val)
return -1;
return strcmp(a->string,b->string);
}
void
print_string_table(FILE *f)
{
String *p;
int i;
for(i = 0; i < STRING_HASH_TABLE_SIZE; i++) {
p = zhash[i];
while (p != (String *) NULL) {
fprintf(f,"[%d] %s\n",p->ref_count,p->string);
p = p->next;
}
}
}
String *
dup_string(String *z)
{
z->ref_count++;
return z;
}
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