From 9a5359bcc8d47de7222d07035ae99459d49e810e Mon Sep 17 00:00:00 2001
From: JSDurand <mmemmew@gmail.com>
Date: Tue, 18 Jul 2023 11:49:43 +0800
Subject: test.c: Save the forest to a file.

This is not of much use right now, but can be helpful later.
---
 src/test.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 68 insertions(+), 4 deletions(-)

diff --git a/src/test.c b/src/test.c
index 5ec2d58..5a5118d 100644
--- a/src/test.c
+++ b/src/test.c
@@ -57,7 +57,7 @@ main(int argc, char **argv)
   }
 
   unsigned char *input = malloc (sizeof(unsigned char) * 10 * 8);
-  
+
   if (input == NULL) {
     clean_parser(parser);
     clean_signed(&error_vec, 4);
@@ -68,11 +68,11 @@ main(int argc, char **argv)
 
   int input_unenc[10] = { 3, 0, 2, 2, 2, 1, 1, 1, 0, 1 };
 
-  for (int i = 0; i < 10; i++) 
+  for (int i = 0; i < 10; i++)
     to_big_endian(input_unenc[i], input + (8 * i));
 
   unsigned char input_len[8] = { 0 };
-  input_len[7] = 8*2;
+  input_len[7] = 8*6;
 
   struct UnsignedVec input_vec =
     (struct UnsignedVec) { input_len, NULL, input };
@@ -82,7 +82,7 @@ main(int argc, char **argv)
      &input_vec,
      &error_vec,
      (unsigned char) 0);
-  
+
   error_length = from_big_endian(error_vec.len);
 
   if (error_length) {
@@ -242,6 +242,70 @@ main(int argc, char **argv)
 
     printf("the forest has the correct length according to the format\n");
 
+    printf("saving to the file \"forest.rep\"\n");
+
+    char *open_mode = "a";
+
+    if (fopen("forest.rep", "r") != NULL) {
+      printf("The file \"forest.rep\" already exists.\n"
+             "Do you want to overwrite it? [y/n] ");
+
+      fflush(stdout);
+
+      #define UNANSWERED 0
+      #define YES 1
+      #define NO 2
+
+      int yes = UNANSWERED;
+
+      while (yes == UNANSWERED) {
+        char input = getchar();
+
+        switch (input) {
+        case 'y':
+          yes = YES;
+          break;
+        case 'n':
+          yes = NO;
+          break;
+        default:
+          printf("Please answer 'y' or 'n'.\n");
+          yes = UNANSWERED;
+          break;
+        }
+      }
+
+      if (yes == NO) {
+        printf("Exiting without saving...\n");
+
+        clean_unsigned(forest_ptr, 15);
+
+        return 0;
+      }
+
+      open_mode = "w";
+
+      #undef UNANSWERED
+      #undef YES
+      #undef NO
+    }
+
+    FILE *forest_file = fopen("forest.rep", open_mode);
+
+    if (forest_file == NULL) {
+      fprintf(stderr, "Cannot open file \"forest.rep\" to write\n");
+
+      clean_unsigned(forest_ptr, 15);
+
+      return 1;
+    }
+
+    fwrite(forest, 1, forest_len, forest_file);
+
+    fclose(forest_file);
+
+    printf("Successfully saved the forest to the file \"forest.rep\"\n");
+
     clean_unsigned(forest_ptr, 15);
   } else {
     printf("no forest\n");
-- 
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