ieee80.c: Fix -Wmissing-prototypes warnings (create an ieee80.h header file).

README.md

 [ToFromIEEE.c.txt](http://www.realitypixels.com/turk/opensource/ToFromIEEE.c.txt)
 which has been made available for use in Open Source applications per the
 [license statement](COPYING.IEEE) on http://www.realitypixels.com/turk/opensource/.
-The only modification made to the code is to comment out the `TEST_FP` define
-to make it useable in the eSpeak NG library.
+The only modifications made to the code is to comment out the `TEST_FP` define
+to make it useable in the eSpeak NG library, and to fix compiler warnings.
 
 The `getopt.c` compatibility implementation for getopt support on Windows is
 taken from the NetBSD `getopt_long` implementation, which is licensed under a

src/libespeak-ng/ieee80.c

 
 #include	<stdio.h>
 #include	<math.h>
+#include	"ieee80.h"
 
 typedef float Single;
 
-#ifndef applec
- typedef double defdouble;
-#else applec
- typedef long double defdouble;
-#endif applec
-
 #ifndef THINK_C
  typedef double Double;
 #else THINK_C

src/libespeak-ng/ieee80.h

+/* Copyright (C) 1989-1991 Apple Computer, Inc.
+ *
+ * All rights reserved.
+ *
+ * Warranty Information
+ *  Even though Apple has reviewed this software, Apple makes no warranty
+ *  or representation, either express or implied, with respect to this
+ *  software, its quality, accuracy, merchantability, or fitness for a
+ *  particular purpose.  As a result, this software is provided "as is,"
+ *  and you, its user, are assuming the entire risk as to its quality
+ *  and accuracy.
+ *
+ * This code may be used and freely distributed as long as it includes
+ * this copyright notice and the above warranty information.
+ *
+ * Machine-independent I/O routines for IEEE floating-point numbers.
+ *
+ * NaN's and infinities are converted to HUGE_VAL or HUGE, which
+ * happens to be infinity on IEEE machines.  Unfortunately, it is
+ * impossible to preserve NaN's in a machine-independent way.
+ * Infinities are, however, preserved on IEEE machines.
+ *
+ * These routines have been tested on the following machines:
+ *	Apple Macintosh, MPW 3.1 C compiler
+ *	Apple Macintosh, THINK C compiler
+ *	Silicon Graphics IRIS, MIPS compiler
+ *	Cray X/MP and Y/MP
+ *	Digital Equipment VAX
+ *	Sequent Balance (Multiprocesor 386)
+ *	NeXT
+ *
+ *
+ * Implemented by Malcolm Slaney and Ken Turkowski.
+ *
+ * Malcolm Slaney contributions during 1988-1990 include big- and little-
+ * endian file I/O, conversion to and from Motorola's extended 80-bit
+ * floating-point format, and conversions to and from IEEE single-
+ * precision floating-point format.
+ *
+ * In 1991, Ken Turkowski implemented the conversions to and from
+ * IEEE double-precision format, added more precision to the extended
+ * conversions, and accommodated conversions involving +/- infinity,
+ * NaN's, and denormalized numbers.
+ */
+#ifndef IEEE_H
+#define IEEE_H
+
+#ifndef applec
+ typedef double defdouble;
+#else applec
+ typedef long double defdouble;
+#endif applec
+
+defdouble ConvertFromIeeeSingle(  char *bytes);
+defdouble ConvertFromIeeeDouble(  char *bytes);
+defdouble ConvertFromIeeeExtended(char *bytes);
+
+void ConvertToIeeeSingle(  defdouble num, char *bytes);
+void ConvertToIeeeDouble(  defdouble num, char *bytes);
+void ConvertToIeeeExtended(defdouble num, char *bytes);
+
+#endif

src/libespeak-ng/spect.c

 #include "voice.h"
 #include "synthesize.h"
 #include "spect.h"
-
-extern double ConvertFromIeeeExtended(unsigned char *bytes);
+#include "ieee80.h"
 
 extern unsigned char pk_shape1[];
 extern int pk_select;
 {
 	unsigned char bytes[10];
 	fread(bytes, sizeof(char), 10, stream);
-	return ConvertFromIeeeExtended(bytes);
+	return ConvertFromIeeeExtended((char *)bytes);
 }
 
 float polint(float xa[], float ya[], int n, float x)