static void
func(void *data, struct slice *slc) {
// slice_print(slc);
struct slice s;
slice_copy(&s, slc);
struct slice *ret = data;
slice_append(ret, &s);
}
static void
recur(struct TreeNode *root, int sum, struct slice *slc, void (*func)(void *, struct slice *), void *data) {
if (root==NULL) return;
slice_append(slc, &root->val);
int save = slc->pos;
if (root->left==NULL && root->right==NULL) {
if (sum==root->val) {
func(data, slc);
} else {
slc->pos = save;
}
return;
}
sum -= root->val;
recur(root->left, sum, slc, func, data);
slc->pos = save;
recur(root->right, sum, slc, func, data);
}
char*
read_file(char *file) {
int fd = open(file, O_RDONLY);
if (fd == 0) {
return NULL;
}
char *ret = NULL;
int size = 0;
int cap = 0;
while(1) {
char buf[1024];
int n = read_all(fd, buf, 1024);
if (n < 0) return NULL;
ret = slice_append(ret, &size, &cap, buf, n);
if (n < 1024) break;
}
return ret;
}