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some cleanups and comments

This commit is contained in:
NRK 2022-07-22 21:33:35 +06:00
parent c3a42f0d92
commit e98d9288d2
1 changed files with 14 additions and 12 deletions
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26
src/icons-hash.c
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@ -38,8 +38,11 @@ static uint16_t icon_ext_hash(const char *s);
/* change ICONS_TABLE_SIZE to increase the size of the table */
static struct icon_pair table[1u << ICONS_TABLE_SIZE];
static uint16_t seen[ARRLEN(table)];
static uint16_t hash_start = 7; /* arbitrarily picked. change if needed. but ensure it's above 1 */
static uint16_t hash_mul = 251; /* same as above ^ */
/* arbitrarily picked starting position. change if needed.
* but ensure they're above 1 and prefer prime numbers.
*/
static uint16_t hash_start = 7;
static uint16_t hash_mul = 251;
/*
* use robin-hood insertion to reduce the max probe length
@ -71,16 +74,16 @@ table_populate(void)
memset(seen, 0x0, sizeof seen);
memset(table, 0x0, sizeof table);
for (size_t i = 0; i < ARRLEN(icons_ext); ++i) {
if (icons_ext[i].icon[0] == '\0') continue;
if (icons_ext[i].icon[0] == '\0') /* skip empty entries */
continue;
uint32_t h = icon_ext_hash(icons_ext[i].match);
rh_insert(icons_ext[i], h, 1);
}
unsigned int max_try = 0;
for (size_t i = 0; i < ARRLEN(seen); ++i) {
if (seen[i] > max_try) max_try = seen[i];
}
return max_try;
unsigned int max_probe = 0;
for (size_t i = 0; i < ARRLEN(seen); ++i)
max_probe = MAX(max_probe, seen[i]);
return max_probe;
}
int
@ -167,9 +170,8 @@ main(void)
for (size_t i = 0; i < ARRLEN(table); ++i) {
if (table[i].icon == NULL || table[i].icon[0] == '\0') /* skip empty entries */
continue;
printf("\t[%u] = {\"%s\", \"%s\", %d },\n",
(unsigned)i, table[i].match, table[i].icon,
(unsigned)table[i].color);
printf("\t[%zu] = {\"%s\", \"%s\", %hhu },\n", i,
table[i].match, table[i].icon, table[i].color);
}
printf("};\n\n");
@ -191,7 +193,7 @@ icon_ext_hash(const char *str)
const unsigned int z = 16 - ICONS_TABLE_SIZE; /* 16 == size of `hash` in bits */
uint16_t hash = hash_start;
for (size_t i = 0; i < ICONS_MATCH_MAX && str[i] != '\0'; ++i) {
hash ^= TOUPPER((unsigned char)str[i]) + (i << 3);
hash ^= TOUPPER((unsigned char)str[i]) + i;
hash *= hash_mul;
}
hash = (hash >> z) ^ hash;