优化了命名

C11-数据结构/ds/tree/save_load/load.c

@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+
+#define FNAME "/tmp/out"
+
+
+struct node_st
+{
+    char            data;
+    struct node_st *l, *r;
+};
+
+
+struct node_st *tree = NULL;
+
+
+static void draw_(struct node_st *root, int level)
+{
+    if (NULL == root)
+        return;
+
+    draw_(root->r, level + 1);
+
+    for (int i = 0; i < level; i++)
+        printf("    ");
+    printf("%c\n", root->data);
+
+    draw_(root->l, level + 1);
+}
+
+/**
+ * @brief    绘制树
+ * @details
+ *           躺下来，根在左，子节点在右。
+ *           这样子，深度即制表符个数。
+ *D
+ * @param    root
+ */
+static void draw(struct node_st *root)
+{
+    draw_(root, 0);
+
+    printf("\n\n");
+}
+
+static struct node_st *load_(FILE *fp)
+{
+    int             c;
+    struct node_st *root;
+
+    c = fgetc(fp);
+    /* if error */
+
+    if ('(' != c)
+    {
+        fprintf(stderr, "fgetc():error.\n");
+        exit(1);
+    }
+
+    c = fgetc(fp);
+    if (')' == c)
+        return 0;
+
+    root = malloc(sizeof(*root));
+    if (NULL == root)
+        exit(1);
+
+    root->data = c;
+    root->l    = load_(fp);
+    root->r    = load_(fp);
+
+    fgetc(fp);
+    /* if error */
+
+    return root;
+}
+
+
+
+static struct node_st *load(const char *path)
+{
+    FILE           *fp;
+    struct node_st *root;
+
+    fp = fopen(path, "r");
+    if (NULL == fp)
+        return NULL;
+
+    root = load_(fp);
+
+    fclose(fp);
+
+    return root;
+}
+
+int main()
+{
+    struct node_st *root;
+
+    root = load(FNAME);
+
+    draw(root);
+
+    exit(0);
+}