tools

commit 7719829ee0a638698cfd2cb92effeec519f47949
parent c8ff0d45255189901ef41775368c4d7ec4ffb298
Author: Morel Bérenger <berengermorel76@gmail.com>
Date:   Thu,  3 Dec 2020 17:27:00 +0100

adds ungets(), based on ungetc()

Diffstat:
M
btl/src/utils.cpp
 | 
13
+++++++++++++
M
btl/src/utils.hpp
 | 
4
++++

2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/btl/src/utils.cpp b/btl/src/utils.cpp
@@ -78,3 +78,16 @@ int esc_fputs( const char *s, FILE *stream )
 	} while( chunk_start != str_end );
 	return 0;
 }
+
+int ungets( char const* const str, size_t str_sz )
+{
+	// reverse push, since otherwise one would start with EOF
+	for( size_t i = str_sz; i; --i )
+	{
+		if( EOF == ungetc( str[i-1], stdin ) )
+		{
+			return i;
+		}
+	}
+	return 0;
+}
diff --git a/btl/src/utils.hpp b/btl/src/utils.hpp
@@ -67,4 +67,8 @@ inline bool empty_array( T* arr )
 //returns 0 on success, INT_MAX on error
 int esc_fputs( const char *s, FILE *stream );
 
+// prints a string into stdin for further reading. Might not
+// be null-terminated.
+inline int ungets( char const* const str, size_t str_sz );
+
 #endif