add libc building to agbcc.

1 files changed, 43 insertions, 0 deletions

diff --git a/libc/stdlib/abs.c b/libc/stdlib/abs.c
new file mode 100644
index 0000000..0308b57
--- /dev/null
+++ b/libc/stdlib/abs.c
@@ -0,0 +1,43 @@
+/*
+FUNCTION
+<<abs>>---integer absolute value (magnitude)
+
+INDEX
+	abs
+
+ANSI_SYNOPSIS
+	#include <stdlib.h>
+	int abs(int <[i]>);
+
+TRAD_SYNOPSIS
+	#include <stdlib.h>
+	int abs(<[i]>)
+	int <[i]>;
+
+DESCRIPTION
+<<abs>> returns
+@tex
+$|x|$,
+@end tex
+the absolute value of <[i]> (also called the magnitude
+of <[i]>).  That is, if <[i]> is negative, the result is the opposite
+of <[i]>, but if <[i]> is nonnegative the result is <[i]>.
+
+The similar function <<labs>> uses and returns <<long>> rather than <<int>> values.
+
+RETURNS
+The result is a nonnegative integer.
+
+PORTABILITY
+<<abs>> is ANSI.
+
+No supporting OS subroutines are required.
+*/
+
+#include <stdlib.h>
+
+int
+_DEFUN (abs, (i), int i)
+{
+  return (i < 0) ? -i : i;
+}