libk/string.cc


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#include "string.h"

// TODO

// int strcpy(char *dst, const char *stc);
// void strcat(void *dst, const void *src);
// char* strncpy(char *dest, const char *src, int length);
// int strncmp(const char *s1, const char *s2, int c);

/* strcmp - compare two C-strings */
constexpr int strcmp(const char *s1, const char *s2)
{
    const auto s1_len = strlen(s1);
    for(size_t i = 0; i < s1_len; ++i) {
        if(s1[i] == s2[i]) continue;
        if(s1[i] > s2[i]) return 1;
        if(s1[i] < s2[i]) return -1;
    }
    return 0;
}

static_assert(strcmp("one", "one") == 0);
static_assert(strcmp("one", "two") < 0);
static_assert(strcmp("foo", "bar") > 0);