c++: Update minimal libc headers

Updates the minimal libc headers for differences between the C and C++
languages.  This includes ...
   1. Conditionally defining "bool", "true" and "false" as they are
      already keywords in C++.
   2. Making the definition of NULL language dependent.
   3. Using the _Restrict macro instead of the restrict keyword as
      restrict exists in C, but not in C++.
   4. Changing the definition of size_t so that it is compatible with
      what the compiler expects when building the new operator stubs
      (as it varies by architecture).

Change-Id: I37ff058a60b90a05f96e9dd6f61d454d143041ce
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>

lib/libc/minimal/include/bits/null.h

@@ -19,5 +19,9 @@
  */
 
 #if !defined(NULL)
+#ifdef __cplusplus
+	#define NULL 0
+#else
 	#define NULL (void *)0
 #endif
+#endif

lib/libc/minimal/include/bits/restrict.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2016 Wind River Systems, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file _Restrict definition
+ *
+ * The macro "_Restrict" is intended to be private to the minimal libc library.
+ * It evaluates to the "restrict" keyword when a C99 compiler is used, and
+ * to "__restrict__" when a C++ compiler is used.
+ */
+
+#if !defined(_Restrict_defined)
+#define _Restrict_defined
+
+#ifdef __cplusplus
+	#define _Restrict __restrict__
+#else
+	#define _Restrict restrict
+#endif
+
+#endif

lib/libc/minimal/include/bits/size_t.h

@@ -21,6 +21,14 @@
 #if !defined(__size_t_defined)
 #define __size_t_defined
 
+#ifdef __i386
+typedef unsigned long int size_t;
+#elif defined(__ARM_ARCH)
 typedef unsigned int size_t;
+#elif defined(__arc__)
+typedef unsigned int size_t;
+#else
+#error "The minimal libc library does not recognize the architecture!\n"
+#endif
 
 #endif

lib/libc/minimal/include/stdbool.h

@@ -19,9 +19,11 @@
 #ifndef __INC_stdbool_h__
 #define __INC_stdbool_h__
 
+#ifndef __cplusplus
 #define bool   _Bool
 #define true   1
 #define false  0
+#endif
 
 #define __bool_true_false_are_defined  1
 

lib/libc/minimal/include/stdio.h

@@ -22,6 +22,7 @@
 #include <stdarg.h>     /* Needed to get definition of va_list */
 #include <bits/null.h>
 #include <bits/size_t.h>
+#include <bits/restrict.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -45,22 +46,22 @@ typedef int  FILE;
  * declared below.
  */
 
-int printf(const char *restrict fmt, ...);
-int snprintf(char *restrict s, size_t len, const char *restrict fmt, ...);
-int sprintf(char *restrict s, const char *restrict fmt, ...);
-int fprintf(FILE *restrict stream, const char *restrict format, ...);
+int printf(const char *_Restrict fmt, ...);
+int snprintf(char *_Restrict s, size_t len, const char *_Restrict fmt, ...);
+int sprintf(char *_Restrict s, const char *_Restrict fmt, ...);
+int fprintf(FILE *_Restrict stream, const char *_Restrict format, ...);
 
 
-int vprintf(const char *restrict fmt, va_list list);
-int vsnprintf(char *restrict s, size_t len, const char *restrict fmt, va_list list);
-int vsprintf(char *restrict s, const char *restrict fmt, va_list list);
-int vfprintf(FILE *restrict stream, const char *restrict format, va_list ap);
+int vprintf(const char *_Restrict fmt, va_list list);
+int vsnprintf(char *_Restrict s, size_t len, const char *_Restrict fmt, va_list list);
+int vsprintf(char *_Restrict s, const char *_Restrict fmt, va_list list);
+int vfprintf(FILE *_Restrict stream, const char *_Restrict format, va_list ap);
 
 int puts(const char *s);
 
 int fputc(int c, FILE *stream);
-int fputs(const char *restrict s, FILE *restrict stream);
-size_t fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream);
+int fputs(const char *_Restrict s, FILE *_Restrict stream);
+size_t fwrite(const void *_Restrict ptr, size_t size, size_t nitems, FILE *_Restrict stream);
 
 #ifdef __cplusplus
 }

lib/libc/minimal/include/string.h

@@ -21,22 +21,23 @@
 
 #include <bits/null.h>
 #include <bits/size_t.h>
+#include <bits/restrict.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-extern char  *strcpy(char *restrict d, const char *restrict s);
-extern char  *strncpy(char *restrict d, const char *restrict s, size_t n);
+extern char  *strcpy(char *_Restrict d, const char *_Restrict s);
+extern char  *strncpy(char *_Restrict d, const char *_Restrict s, size_t n);
 extern char  *strchr(const char *s, int c);
 extern size_t strlen(const char *s);
 extern int    strcmp(const char *s1, const char *s2);
 extern int    strncmp(const char *s1, const char *s2, size_t n);
-extern char *strcat(char *restrict dest, const char *restrict src);
+extern char *strcat(char *_Restrict dest, const char *_Restrict src);
 
 extern int    memcmp(const void *m1, const void *m2, size_t n);
 extern void  *memmove(void *d, const void *s, size_t n);
-extern void  *memcpy(void *restrict d, const void *restrict s, size_t n);
+extern void  *memcpy(void *_Restrict d, const void *_Restrict s, size_t n);
 extern void  *memset(void *buf, int c, size_t n);
 extern void  *memchr(const void *s, unsigned char c, size_t n);
 

lib/libc/minimal/source/stdout/fprintf.c

@@ -24,7 +24,7 @@
 extern int _prf(int (*func)(), void *dest,
 				const char *format, va_list vargs);
 
-int fprintf(FILE * restrict F, const char *restrict format, ...)
+int fprintf(FILE *_Restrict F, const char *_Restrict format, ...)
 {
 	va_list vargs;
 	int     r;
@@ -36,7 +36,7 @@ int fprintf(FILE * restrict F, const char *restrict format, ...)
 	return r;
 }
 
-int vfprintf(FILE * restrict F, const char *restrict format, va_list vargs)
+int vfprintf(FILE *_Restrict F, const char *_Restrict format, va_list vargs)
 {
 	int r;
 
@@ -45,7 +45,7 @@ int vfprintf(FILE * restrict F, const char *restrict format, va_list vargs)
 	return r;
 }
 
-int printf(const char *restrict format, ...)
+int printf(const char *_Restrict format, ...)
 {
 	va_list vargs;
 	int     r;
@@ -57,7 +57,7 @@ int printf(const char *restrict format, ...)
 	return r;
 }
 
-int vprintf(const char *restrict format, va_list vargs)
+int vprintf(const char *_Restrict format, va_list vargs)
 {
 	int r;
 

lib/libc/minimal/source/stdout/sprintf.c

@@ -37,7 +37,7 @@ static int sprintf_out(int c, struct emitter *p)
 	return 0; /* indicate keep going so we get the total count */
 }
 
-int snprintf(char *restrict s, size_t len, const char *restrict format, ...)
+int snprintf(char *_Restrict s, size_t len, const char *_Restrict format, ...)
 {
 	va_list vargs;
 
@@ -64,7 +64,7 @@ int snprintf(char *restrict s, size_t len, const char *restrict format, ...)
 	return r;
 }
 
-int sprintf(char *restrict s, const char *restrict format, ...)
+int sprintf(char *_Restrict s, const char *_Restrict format, ...)
 {
 	va_list vargs;
 
@@ -82,7 +82,7 @@ int sprintf(char *restrict s, const char *restrict format, ...)
 	return r;
 }
 
-int vsnprintf(char *restrict s, size_t len, const char *restrict format, va_list vargs)
+int vsnprintf(char *_Restrict s, size_t len, const char *_Restrict format, va_list vargs)
 {
 	struct emitter p;
 	int     r;
@@ -105,7 +105,7 @@ int vsnprintf(char *restrict s, size_t len, const char *restrict format, va_list
 	return r;
 }
 
-int vsprintf(char *restrict s, const char *restrict format, va_list vargs)
+int vsprintf(char *_Restrict s, const char *_Restrict format, va_list vargs)
 {
 	struct emitter p;
 	int     r;

lib/libc/minimal/source/stdout/stdout_console.c

@@ -37,7 +37,7 @@ int fputc(int c, FILE *stream)
 	return (stdout == stream) ? _stdout_hook(c) : EOF;
 }
 
-int fputs(const char *restrict string, FILE *restrict stream)
+int fputs(const char *_Restrict string, FILE *_Restrict stream)
 {
 	if (stream != stdout) {
 		return EOF;
@@ -53,8 +53,8 @@ int fputs(const char *restrict string, FILE *restrict stream)
 	return 0;
 }
 
-size_t fwrite(const void *restrict ptr, size_t size, size_t nitems,
-			  FILE *restrict stream)
+size_t fwrite(const void *_Restrict ptr, size_t size, size_t nitems,
+			  FILE *_Restrict stream)
 {
 	size_t i;
 	size_t j;

lib/libc/minimal/source/string/string.c

@@ -25,7 +25,7 @@
  * @return pointer to destination buffer <d>
  */
 
-char *strcpy(char *restrict d, const char *restrict s)
+char *strcpy(char *_Restrict d, const char *_Restrict s)
 {
 	char *dest = d;
 
@@ -47,7 +47,7 @@ char *strcpy(char *restrict d, const char *restrict s)
  * @return pointer to destination buffer <d>
  */
 
-char *strncpy(char *restrict d, const char *restrict s, size_t n)
+char *strncpy(char *_Restrict d, const char *_Restrict s, size_t n)
 {
 	char *dest = d;
 
@@ -138,7 +138,7 @@ int strncmp(const char *s1, const char *s2, size_t n)
 	return (n == 0) ? 0 : (*s1 - *s2);
 }
 
-char *strcat(char *restrict dest, const char *restrict src)
+char *strcat(char *_Restrict dest, const char *_Restrict src)
 {
 	strcpy(dest + strlen(dest), src);
 	return dest;
@@ -208,7 +208,7 @@ void *memmove(void *d, const void *s, size_t n)
  * @return pointer to start of destination buffer
  */
 
-void *memcpy(void *restrict d, const void *restrict s, size_t n)
+void *memcpy(void *_Restrict d, const void *_Restrict s, size_t n)
 {
 	/* attempt word-sized copying only if buffers have identical alignment */