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#include "prism/util/pm_strncasecmp.h"
/**
* A locale-insensitive version of `tolower(3)`
*/
static inline int
pm_tolower(int c)
{
if ('A' <= c && c <= 'Z') {
return c | 0x20;
}
return c;
}
/**
* Compare two strings, ignoring case, up to the given length. Returns 0 if the
* strings are equal, a negative number if string1 is less than string2, or a
* positive number if string1 is greater than string2.
*
* Note that this is effectively our own implementation of strncasecmp, but it's
* not available on all of the platforms we want to support so we're rolling it
* here.
*/
int
pm_strncasecmp(const uint8_t *string1, const uint8_t *string2, size_t length) {
size_t offset = 0;
int difference = 0;
while (offset < length && string1[offset] != '\0') {
if (string2[offset] == '\0') return string1[offset];
if ((difference = pm_tolower(string1[offset]) - pm_tolower(string2[offset])) != 0) return difference;
offset++;
}
return difference;
}
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