add libc building to agbcc.

1 files changed, 50 insertions, 0 deletions

diff --git a/libc/string/strlwr.c b/libc/string/strlwr.c
new file mode 100644
index 0000000..cf0d45f
--- /dev/null
+++ b/libc/string/strlwr.c
@@ -0,0 +1,50 @@
+/*
+FUNCTION
+	<<strlwr>>---force string to lower case
+	
+INDEX
+	strlwr
+
+ANSI_SYNOPSIS
+	#include <string.h>
+	char *strlwr(char *<[a]>);
+
+TRAD_SYNOPSIS
+	#include <string.h>
+	char *strlwr(<[a]>)
+	char *<[a]>;
+
+DESCRIPTION
+	<<strlwr>> converts each characters in the string at <[a]> to
+	lower case.
+
+RETURNS
+	<<strlwr>> returns its argument, <[a]>.
+
+PORTABILITY
+<<strlwr>> is not widely portable.
+
+<<strlwr>> requires no supporting OS subroutines.
+
+QUICKREF
+	strlwr
+*/
+
+#include <string.h>
+#include <ctype.h>
+
+char *
+strlwr (a)
+     char *a;
+{
+  char *ret = a;
+
+  while (*a != '\0')
+    {
+      if (isupper (*a))
+	*a = tolower (*a);
+      ++a;
+    }
+
+  return ret;
+}