Use longer example buffer to avoid complicated buffer management in reads-stdin.c.

Co-authored-by: Robert Schumacher <[email protected]>

Author: BillyONeal

src/reads-stdin.c

@@ -4,65 +4,35 @@
 // This program reads stdin and asserts that it is the expected value repeated
 // until stdin ends
 
-// Intentionally a prime length to make hitting buffering edge cases more likely
-const char expected_repeat[] = {'e', 'x', 'a', 'm', 'p', 'l', 'e'};
-
 int main(int argc, char** argv)
 {
-    size_t consumed_prefix = 0;
     char buffer[20];
+    // The repeated string 'example' is intentionally a prime length to make hitting buffering edge
+    // cases more likely
+    const char expected[] = "exampleexampleexampleexamp";
+    size_t offset = 0; // always between 0 and 6
     for (;;)
     {
         size_t read_amount = fread(buffer, 1, sizeof(buffer), stdin);
         if (argc > 1)
         {
             puts(argv[1]);
+            fflush(stdout);
         }
-
         if (read_amount == 0)
         {
             if (feof(stdin))
             {
                 puts("success");
                 return 0;
             }
-
             return 1;
         }
 
-        size_t prefix_check = read_amount;
-        if (prefix_check <= (sizeof(expected_repeat) - consumed_prefix))
-        {
-            // check a partial suffix (this read didn't include a complete suffix)
-            if (memcmp(buffer, expected_repeat + consumed_prefix, prefix_check) != 0)
-            {
-                return 2;
-            }
-
-            consumed_prefix += prefix_check;
-            continue;
-        }
-
-        // check a whole suffix to realign to expected_repeat blocks
-        prefix_check = sizeof(expected_repeat) - consumed_prefix;
-        if (memcmp(buffer, expected_repeat + consumed_prefix, prefix_check) != 0)
-        {
-            return 3;
-        }
-
-        size_t checked = prefix_check;
-        for (; read_amount - checked >= sizeof(expected_repeat); checked += sizeof(expected_repeat))
-        {
-            if (memcmp(buffer + checked, expected_repeat, sizeof(expected_repeat)) != 0)
-            {
-                return 4;
-            }
-        }
-
-        consumed_prefix = read_amount - checked;
-        if (memcmp(buffer + checked, expected_repeat, consumed_prefix) != 0)
+        if (memcmp(buffer, expected + offset, read_amount) != 0)
         {
-            return 5;
+            return 2;
         }
+        offset = (offset + read_amount) % 7;
     }
 }