From ef852b1eb421ecf6f98efeee71f87c8fc4110c50 Mon Sep 17 00:00:00 2001
From: Lieuwe Rooijakkers <lieuwerooijakkers@gmail.com>
Date: Sun, 21 Jul 2024 17:19:15 +0200
Subject: tak: betere foutafwerking

---
 src/tak.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/tak.c b/src/tak.c
index 3aa4d84..bf8bfef 100644
--- a/src/tak.c
+++ b/src/tak.c
@@ -67,16 +67,26 @@ static void process(struct state state) {
   }
 }
 
+#define CHECK_OOM(ptr) \
+  if (ptr == NULL) { \
+    fprintf(stderr, "tak: geheugen is op"); \
+    /* I think I should free the original memory here, but whatever */ \
+    return NULL; \
+  }
+
 static char *read_stdin(size_t *sz) {
   const size_t CHUNK_SIZE = 4096;
 
+  *sz = 0;
   size_t cap = CHUNK_SIZE;
   char *res = malloc(cap);
+  CHECK_OOM(res);
 
   while (!feof(stdin)) {
     if (cap-*sz < CHUNK_SIZE) {
       cap *= 2;
       res = realloc(res, cap);
+      CHECK_OOM(res);
     }
 
     const size_t n = fread(res+*sz, 1, CHUNK_SIZE, stdin);
@@ -84,7 +94,8 @@ static char *read_stdin(size_t *sz) {
 
     if (n != CHUNK_SIZE && !feof(stdin)) {
       fprintf(stderr, "tak: fout tijdens lezen van standaard invoer.\n");
-      exit(1);
+      free(res);
+      return NULL;
     }
   }
 
@@ -96,6 +107,9 @@ int entry_tak(int argc, char **argv) {
   if (*args == NULL) {
     size_t sz = 0;
     char *data = read_stdin(&sz);
+    if (data == NULL) {
+      return 1;
+    }
 
     struct state state = { .buf = data, .sz = sz };
     process(state);
-- 
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