From 47d602cf884b14e4c529286238e2085fe97338d7 Mon Sep 17 00:00:00 2001
From: Mubashshir <ahmubashshir@gmail.com>
Date: Sat, 16 Nov 2024 00:32:45 +0600
Subject: Add util string formatter

Signed-off-by: Mubashshir <ahmubashshir@gmail.com>
---
 src/system.yy |  6 ++++--
 src/util.h    | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 src/util.h

diff --git a/src/system.yy b/src/system.yy
index cd6ddc9..0727213 100644
--- a/src/system.yy
+++ b/src/system.yy
@@ -27,6 +27,7 @@ bool legacy = true;
 #include <cstdint>
 #include "lexer.h"
 #include "location.h"
+#include "util.h"
 }
 
 //%locations
@@ -69,7 +70,8 @@ block_end:
 			ofstream f(p, ios_base::out | ios_base::binary);
 			msg.SerializeToOstream(&f);
 			f.close();
-		}
+		} else
+			throw syntax_error(string_format("Block EPOCH mismatch: begin:%llu, end:%llu", msg.epoch(), $ULONG));
 		msg.Clear();
 	}
 
@@ -275,7 +277,7 @@ namespace yy
   // Report an error to the user.
   auto parser::error (const std::string& msg) -> void
   {
-    std::cerr << msg << " on line " << lexer.lineno() << '\n';
+    std::cerr << "\nERROR: " << msg << " on line " << lexer.lineno() - 1<< '\n';
   }
 }
 
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..a54d3eb
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,19 @@
+#ifndef __UTIL_H__
+#define __UTIL_H__
+
+#include <memory>
+#include <string>
+#include <stdexcept>
+
+template<typename ... Args>
+std::string string_format( const std::string& format, Args ... args )
+{
+    int size_s = std::snprintf( nullptr, 0, format.c_str(), args ... ) + 1; // Extra space for '\0'
+    if( size_s <= 0 ){ throw std::runtime_error( "Error during formatting." ); }
+    auto size = static_cast<size_t>( size_s );
+    std::unique_ptr<char[]> buf( new char[ size ] );
+    std::snprintf( buf.get(), size, format.c_str(), args ... );
+    return std::string( buf.get(), buf.get() + size - 1 ); // We don't want the '\0' inside
+}
+
+#endif /* __UTIL_H__ */
-- 
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