add libc building to agbcc.

1 files changed, 44 insertions, 0 deletions

diff --git a/libc/time/difftime.c b/libc/time/difftime.c
new file mode 100644
index 0000000..93a4f00
--- /dev/null
+++ b/libc/time/difftime.c
@@ -0,0 +1,44 @@
+/*
+ * difftime.c
+ * Original Author:	G. Haley
+ */
+
+/*
+FUNCTION
+<<difftime>>---subtract two times
+
+INDEX
+	difftime
+
+ANSI_SYNOPSIS
+	#include <time.h>
+	double difftime(time_t <[tim1]>, time_t <[tim2]>);
+
+TRAD_SYNOPSIS
+	#include <time.h>
+	double difftime(<[tim1]>, <[tim2]>)
+	time_t <[tim1]>;
+	time_t <[tim2]>;
+
+DESCRIPTION
+Subtracts the two times in the arguments: `<<<[tim1]> - <[tim2]>>>'.
+
+RETURNS
+The difference (in seconds) between <[tim2]> and <[tim1]>, as a <<double>>.
+
+PORTABILITY
+ANSI C requires <<difftime>>, and defines its result to be in seconds
+in all implementations.
+
+<<difftime>> requires no supporting OS subroutines.
+*/
+
+#include <time.h>
+
+double
+_DEFUN (difftime, (tim1, tim2),
+	time_t tim1 _AND
+	time_t tim2)
+{
+  return ((double) tim1 - tim2);
+}