1 files changed, 60 insertions, 0 deletions
diff --git a/lib/float-ok.c b/lib/float-ok.c
new file mode 100644
index 0000000..b3e81d6
--- /dev/null
+++ b/lib/float-ok.c
@@ -0,0 +1,60 @@
+/* float-ok.c: test if a string is a valid floating-point number.
+
+Copyright (C) 1992 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "config.h"
+
+#include <kpathsea/c-ctype.h>
+
+
+/* Actually, we don't worry about a trailing exponent.  */
+
+boolean
+float_ok (string str)
+{
+  boolean found_digit = false;
+  
+  if (str == NULL)
+    return false;
+    
+  /* Allow leading `-' or `+' sign (but digits must follow).  */
+  if (*str == '-' || *str == '+')
+    {
+      str++;
+    }
+  
+  /* Skip decimal digits.  */
+  while (ISDIGIT (*str))
+    {
+      str++;
+      found_digit = true;
+    }
+  
+  /* If a `.' follows, can have more digits.  */
+  if (*str == '.')
+    {
+      str++;
+      while (ISDIGIT (*str))
+        {
+          str++;
+          found_digit = true;
+	}
+    }
+  
+  return *str == 0 && found_digit;
+}
+