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

#include <string.h>

/*
 * True when c appears anywhere in set (including as the NUL of set — but set
 * is a string, so scanning stops at that NUL, as intended).
 */
static int
str_in_set(const char *set, char c) // NOLINT(bugprone-easily-swappable-parameters)
{
    for (; *set != '\0'; set++)
    {
        if (*set == c)
        {
            return 1;
        }
    }
    return 0;
}

/*
 * Return the length of the initial span of s consisting entirely of bytes
 * that occur in accept.
 */
size_t
strspn(const char *s, const char *accept) // NOLINT(bugprone-easily-swappable-parameters)
{
    size_t n = 0;

    while (s[n] != '\0' && str_in_set(accept, s[n]))
    {
        n++;
    }
    return n;
}

/*
 * Return the length of the initial span of s consisting entirely of bytes
 * that do NOT occur in reject.
 */
size_t
strcspn(const char *s, const char *reject) // NOLINT(bugprone-easily-swappable-parameters)
{
    size_t n = 0;

    while (s[n] != '\0' && !str_in_set(reject, s[n]))
    {
        n++;
    }
    return n;
}

/*
 * Return a pointer to the first byte in s that also occurs in accept, or
 * NULL when none occurs.
 */
char *
strpbrk(const char *s, const char *accept) // NOLINT(bugprone-easily-swappable-parameters)
{
    for (; *s != '\0'; s++)
    {
        if (str_in_set(accept, *s))
        {
            return (char *)s;
        }
    }
    return NULL;
}