/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* https://git.datadissipation.net */
#ifndef STRLCAT_H_
 #define STRLCAT_H_     1

 #ifdef STRLCAT_INCLUDE_LIBC
  #include <stdio.h>
  #include <string.h>
 #endif /* !STRLCAT_INCLUDE_LIBC */

 #ifndef HAVE_STRLCAT
  #define HAVE_STRLCAT  1
  #define strlcat       i_strlcat_
  #define strlcpy       i_strlcpy_
size_t i_strlcat_(char *dst, const char *src, size_t siz);
size_t i_strlcpy_(char *dst, const char *src, size_t siz);
 #endif /* !HAVE_STRLCAT */

 #ifdef STRLCAT_IMPLEMENTATION
/*
 * Appends src to string dst of size siz (unlike strncat, siz is the
 * full size of dst, not space left). At most siz-1 characters
 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
 * If retval >= siz, truncation occurred.
 */
size_t
i_strlcat_(char *dst, const char *src, size_t siz)
{
	char *d = dst;
	const char *s = src;
	size_t n = siz;
	size_t dlen;
	/* Find the end of dst and adjust bytes left but don't go past end */
	while (n-- != 0 && *d != '\0')
		d++;
	dlen = d - dst;
	n = siz - dlen;
	if (n == 0)
		return (dlen + strlen(s));
	while (*s != '\0') {
		if (n != 1) {
			*d++ = *s;
			n--;
		}
		s++;
	}
	*d = '\0';
	return (dlen + (s - src)); /* count does not include NUL */
}

/*
 * Copy src to string dst of size siz. At most siz-1 characters
 * will be copied. Always NUL terminates (unless siz == 0).
 * Returns strlen(src); if retval >= siz, truncation occurred.
 */
size_t
i_strlcpy_(char *dst, const char *src, size_t siz)
{
	char *d = dst;
	const char *s = src;
	size_t n = siz;
	/* Copy as many bytes as will fit */
	if (n != 0) {
		while (--n != 0) {
			if ((*d++ = *s++) == '\0')
				break;
		}
	}
	/* Not enough room in dst, add NUL and traverse rest of src */
	if (n == 0) {
		if (siz != 0)
			*d = '\0'; /* NUL-terminate dst */
		while (*s++)
			;
	}
	return(s - src - 1); /* count does not include NUL */
}
 #endif /* STRLCAT_IMPLEMENTATION */
#endif /* !STRLCAT_H_ */