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/* dctrl-tools - Debian control file inspection tools
Copyright (C) 2003 Antti-Juhani Kaijanaho
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include "fieldtrie.h"
#include "msg.h"
struct field_bucket {
char const * name;
size_t namelen;
struct field_attr attr;
struct field_bucket * next;
};
struct fieldtrie_private {
size_t nextfree;
/* A one-level trie listing all field names occurring in the
* atomic predicates. */
struct field_bucket * fields[UCHAR_MAX];
};
static struct fieldtrie_private trie;
void fieldtrie_init(void)
{
for (size_t i = 0; i < UCHAR_MAX; i++) {
trie.fields[i] = 0;
}
trie.nextfree = 0;
}
size_t fieldtrie_insert(char const * s)
{
size_t slen = strlen(s);
struct field_attr l_attr = fieldtrie_lookup(s, slen);
if (l_attr.valid) return l_attr.inx;
struct field_bucket * b = malloc(sizeof *b);
if (b == 0) fatal_enomem(0);
b->name = malloc(slen+1);
if (b->name == 0) fatal_enomem(0);
strcpy((char*)b->name, s);
b->namelen = slen;
b->attr.inx = trie.nextfree++;
b->attr.valid = true;
unsigned char c = tolower((unsigned char)(b->name[0]));
b->next = trie.fields[c];
trie.fields[c] = b;
return b->attr.inx;
}
struct field_attr fieldtrie_lookup(char const * s, size_t n)
{
for (struct field_bucket * b = trie.fields[tolower((unsigned char)s[0])];
b != 0;
b = b->next) {
if (n == b->namelen &&
strncasecmp(s, b->name, n) == 0) return b->attr;
}
return (struct field_attr){ .valid = false };
}
size_t fieldtrie_count(void)
{
return trie.nextfree;
}
#if 0
void fieldtrie_clear(void)
{
for (size_t i = 0; i < UCHAR_MAX; i++) {
struct field_bucket * b = trie.fields[i];
while (b != 0) {
struct field_bucket * bn = b->next;
free(b);
b = bn;
}
trie->fields[i] = 0;
}
trie->nextfree = 0;
}
#endif
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