src/libespeak-ng: Replace ieee80.c by a free software implementation

https://github.com/espeak-ng/espeak-ng/issues/1072

Signed-off-by: Ulrich Müller <ulm@gentoo.org>

CHANGELOG.md

@@ -23,6 +23,7 @@ The espeak-ng project is a fork of the espeak project.
    Use cmn-latn-pinyin for interpreting latin characters as pinyin
 *  Update list of voice varants for Android application
 *  Add Chromium extension (guest271314)
+*  Replace `ieee80.c` by a free software implementation (Ulrich Müller)
 
 bug fixes:
 *  Fix reading malformed SSML (Christopher Brannon)

COPYING.IEEE

@@ -1,17 +0,0 @@
-Source: http://www.realitypixels.com/turk/opensource/
-
-Open Source Repository
-
-courtesy of
-Ken Turkowski
-
-The source code available from this page may be freely downloaded and used in
-any applications for any purpose, as long as the code is used in its entirety
-and the copyright notice and warranty information is retained.
-
-If you make any improvements to this software, you should provide me with said
-improvements.
-
-If any of this code is incorporated into a commercial product, you should
-notify me of this by email, and provide me with a complimentary copy of said
-product. :-)

Makefile.am

@@ -15,11 +15,9 @@ SHARED_VERSION=2:51:1 # = *.so.1.1.51
 
 MKDIR=mkdir -p
 
-# -Wno-endif-labels : Needed to prevent warnings in ieee80.c.
 AM_CFLAGS = \
 	-Isrc/include -Isrc/include/compat -I$(srcdir)/src/speechPlayer/include -I$(srcdir)/src/ucd-tools/src/include \
-	-D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L \
-	-Wno-endif-labels
+	-D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L
 
 EXTRA_DIST=
 CLEANFILES = dictsource/ru_listx dictsource/cmn_listx dictsource/yue_listx

README.md

@@ -130,13 +130,6 @@ the 1.24.02 source commit.
 eSpeak NG Text-to-Speech is released under the [GPL version 3](COPYING) or
 later license.
 
-The `ieee80.c` implementation is taken directly from
-[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 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
 [2-clause BSD](COPYING.BSD2) license.

src/libespeak-ng/ieee80.h

@@ -1,63 +1 @@
-/* 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
+double ieee_extended_to_double(const unsigned char *);

src/libespeak-ng/spect.c

@@ -49,7 +49,7 @@ static double read_double(FILE *stream)
 {
 	unsigned char bytes[10];
 	fread(bytes, sizeof(char), 10, stream);
-	return ConvertFromIeeeExtended((char *)bytes);
+	return ieee_extended_to_double(bytes);
 }
 
 float polint(float xa[], float ya[], int n, float x)