mirror of
https://github.com/tursodatabase/libsql.git
synced 2025-03-08 23:41:50 +00:00
d3a156caf5
A common complain with libSQL is how to run extensions. The main mechanism, with a .so, has a lot of issues around how those .so are distributed. The most common extensions are the ones in the sqlean package. We can improve this experience by bundling them in our sqlite build. Not all SQLean extensions are kosher: some of them, like fileio, use the vfs. Others, are deemed too complex. The extensions included here are a subset that we deem important enough, and low risk enough, to just be a part of the main bundle.
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
// Copyright (c) 2014 Ross Bayer, MIT License
|
|
// https://github.com/Rostepher/libstrcmp
|
|
|
|
#include <assert.h>
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
|
|
#include "fuzzy/common.h"
|
|
|
|
/// Computes and returns the hamming distance between two strings. Both strings
|
|
/// must have the same length and not be NULL. More information about the
|
|
/// algorithm can be found here:
|
|
/// http://en.wikipedia.org/wiki/Hamming_distance
|
|
///
|
|
/// @param str1 first non NULL string
|
|
/// @param str2 second non NULL string
|
|
///
|
|
/// @returns hamming distance or -1 if str1 and st2 did not have the same
|
|
/// length or if one or both str1 and str2 were NULL
|
|
int hamming(const char* str1, const char* str2) {
|
|
// strings cannot be NULL
|
|
assert(str1 != NULL);
|
|
assert(str2 != NULL);
|
|
|
|
size_t str1_len = strlen(str1);
|
|
size_t str2_len = strlen(str2);
|
|
|
|
// handle cases where strings have different lengths
|
|
if (str1_len != str2_len) {
|
|
return -1;
|
|
}
|
|
|
|
// return 0 if strings are both empty, but not NULL
|
|
if (str1_len == 0 && str2_len == 0) {
|
|
return 0;
|
|
}
|
|
|
|
int dist = 0;
|
|
while (str1_len > 0 && str2_len > 0) {
|
|
dist += (NOT_EQ(*str1, *str2));
|
|
str1++, str2++;
|
|
str1_len--, str2_len--;
|
|
}
|
|
|
|
return dist;
|
|
}
|