#include "libft.h"

/**
 * Concatenates an array of strings into a pre-allocated destination buffer.
 *
 * @param dst      Destination buffer.
 * @param dst_size Size of the destination buffer (including space for null terminator).
 * @param srcs     Array of source strings to concatenate.
 * @param n        Number of strings in `srcs`.
 * @return         The total length of the concatenated string (excluding null terminator),
 *                 or 0 if the buffer is too small.
 * @note           The caller must ensure `dst_size > 0`. If the buffer is too small,
 *                 the function returns 0 and `dst` is set to an empty string.
 */

size_t strjoin_static(char *dst, size_t dst_size, const char **srcs, size_t n)
{
    // Calculate total length needed
    size_t total_len = 0;
    for (size_t i = 0; i < n; i++)
    {
        total_len += ft_strlen(srcs[i]);
    }

    // Check if buffer is large enough (include space for '\0')
    if (total_len + 1 > dst_size)
    {
        dst[0] = '\0';
        return 0;
    }

    // Copy strings
    char *ptr = dst;
    for (size_t i = 0; i < n; i++)
    {
        size_t len = ft_strlen(srcs[i]);
        ft_memcpy(ptr, srcs[i], len);
        ptr += len;
    }
    *ptr = '\0';
    return total_len;
}