test.c

#include "darray.h"
int change_path(D_ARRAY *path, const char *change, size_t ch_len)
{
#define IS_DIR_END(path) ((path)->array[(path)->len - 1] == '/')
#define PUT_DRI(path, dir, dir_len) do {			\
	if ((path)->len == 0 || !IS_DIR_END(path))	\
		dynamic_array_put(path, "/", 1);		\
	dynamic_array_put(path, dir, dir_len);			\
} while (0);
	/* 最多可能需要添加额外两个'/' */
	if (dynamic_array_check_size(path, ch_len + 3) < 0)
		return -1;

	if (ch_len > 0 && *change == '/')
		D_ARRAY_RESET(path);

	while (ch_len > 0) {
		const char *ptr = memchr(change, '/', ch_len);
		size_t dir_len = ptr ? ptr - change : ch_len;
		if (dir_len == 0 || (dir_len == 1 && change[0] == '.'))
			goto LOOP_NEXT;
		if (dir_len == 2 && change[0] == '.' && change[1] == '.') {
			if (path->len > 0 && IS_DIR_END(path))
				path->len--;
			while (path->len > 0 && !IS_DIR_END(path))
				path->len--;
			goto LOOP_NEXT;
		}
		PUT_DRI(path, change, dir_len);
	LOOP_NEXT:
		if (ptr == NULL) 
			break;
		ch_len -= dir_len + 1, change += dir_len + 1;
	}

	return 0;
}