strncasecmp.c

#include "prism/internal/strncasecmp.h"
 
#include "prism/compiler/inline.h"
 
static PRISM_INLINE int
pm_tolower(int c) {
    if ('A' <= c && c <= 'Z') {
        return c | 0x20;
    }
    return c;
}
 
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;
}