#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

/*
 * Append src (including its terminating NUL) to the end of dst; return dst.
 * The strings must not overlap (restrict).
 *
 * See strcpy.c: the copy loop is a recognizable pattern, so disable
 * -ftree-loop-distribute-patterns here too.
 */
__attribute__((optimize("no-tree-loop-distribute-patterns"))) char *
strcat(char *restrict dst, const char *restrict src) // NOLINT(bugprone-*)
{
    char *d = dst;

    /* Find the terminating NUL of dst. */
    while (*d != '\0')
    {
        d++;
    }

    /* Append src including its NUL. */
    for (;;)
    {
        *d++ = *src;
        if (*src == '\0')
        {
            return dst;
        }
        src++;
    }
}

/*
 * Append at most n bytes of src to dst and always NUL-terminate; return dst.
 *
 * See strcpy.c: the copy loop is a recognizable pattern, so disable
 * -ftree-loop-distribute-patterns here too.
 */
__attribute__((optimize("no-tree-loop-distribute-patterns"))) char *
strncat(char *restrict dst, const char *restrict src, size_t n) // NOLINT(bugprone-*)
{
    char *d = dst;

    /* Find the terminating NUL of dst. */
    while (*d != '\0')
    {
        d++;
    }

    /* Append at most n bytes of src, stopping early at its NUL. */
    while (n != 0 && *src != '\0')
    {
        *d++ = *src++;
        n--;
    }

    /* strncat always NUL-terminates. */
    *d = '\0';

    return dst;
}