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Non linear str2int

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This commit is contained in:
Olof hagsand 2019-04-23 12:53:29 +02:00
parent 77ad42f1ce
commit 1e1eabbc06
6 changed files with 104 additions and 19 deletions
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61
lib/src/clixon_string.c
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@ -552,7 +552,7 @@ clicon_int2str(const map_str2int *mstab,
* @param[in] str Input string
* @retval int Value
* @retval -1 Error, not found
* @note linear search
* @see clicon_str2int_search for optimized lookup, but strings must be sorted
*/
int
clicon_str2int(const map_str2int *mstab,
@ -566,6 +566,65 @@ clicon_str2int(const map_str2int *mstab,
return -1;
}
/*! Map from string to int using binary (alphatical) search
* @param[in] ms String, integer map
* @param[in] str Input string
* @param[in] low Lower bound index
* @param[in] upper Upper bound index
* @param[in] len Length of array (max)
* @param[out] found Integer found (can also be negative)
* @retval 0 Not found
* @retval 1 Found with "found" value set.
* @note Assumes sorted strings, tree search
*/
static int
str2int_search1(const map_str2int *mstab,
char *str,
int low,
int upper,
int len,
int *found)
{
const struct map_str2int *ms;
int mid;
int cmp;
if (upper < low)
return 0; /* not found */
mid = (low + upper) / 2;
if (mid >= len) /* beyond range */
return 0; /* not found */
ms = &mstab[mid];
if ((cmp = strcmp(str, ms->ms_str)) == 0){
*found = ms->ms_int;
return 1; /* found */
}
else if (cmp < 0)
return str2int_search1(mstab, str, low, mid-1, len, found);
else
return str2int_search1(mstab, str, mid+1, upper, len, found);
}
/*! Map from string to int using str2int map
* @param[in] ms String, integer map
* @param[in] str Input string
* @retval int Value
* @retval -1 Error, not found
* @note Assumes sorted strings, tree search
* @note -1 can not be value
*/
int
clicon_str2int_search(const map_str2int *mstab,
char *str,
int len)
{
int found;
if (str2int_search1(mstab, str, 0, len, len, &found))
return found;
return -1; /* not found */
}
/*! Split colon-separated node identifier into prefix and name
* @param[in] node-id
* @param[out] prefix Malloced string. May be NULL.