#include <stddef.h>
#include <string.h>

extern const char **__crt_environ();

char *__crt_sys_getenv(const char *name)
{
    const char **envp = __crt_environ();

    for (int i = 0; envp[i] != NULL; i++) {
        int equal = -1;
        const char *env = envp[i];

        for (int ii = 0; env[ii] != '\0'; ii++) {
            if (env[ii] == '=') {
                equal = ii;
                break;
            }
        }

        if (equal == -1) {
            continue;
        }

        char env_name[equal + 1];
        memcpy(env_name, env, equal);
        env_name[equal] = '\0';

        if (!strcmp(env_name, name)) {
            return (char *)(env + equal + 1);
        }
    }

    return NULL;
}