tiny C support; cosmetic improvements for the docs

1 files changed, 85 insertions, 0 deletions

diff --git a/tinyc/win32/include/fenv.h b/tinyc/win32/include/fenv.h
new file mode 100755
index 000000000..ddc43dfc8
--- /dev/null
+++ b/tinyc/win32/include/fenv.h
@@ -0,0 +1,85 @@
+#ifndef _FENV_H
+#define _FENV_H
+
+/*
+  For now, support only for the basic abstraction of flags that are
+  either set or clear. fexcept_t could be  structure that holds more info
+  about the fp environment.
+*/
+typedef unsigned short fexcept_t;
+
+/* This 28-byte struct represents the entire floating point
+   environment as stored by fnstenv or fstenv */
+typedef struct
+{
+  unsigned short __control_word;
+  unsigned short __unused0;
+  unsigned short __status_word;
+  unsigned short __unused1;
+  unsigned short __tag_word;
+  unsigned short __unused2;  
+  unsigned int	 __ip_offset;    /* instruction pointer offset */
+  unsigned short __ip_selector;  
+  unsigned short __opcode;
+  unsigned int	 __data_offset;
+  unsigned short __data_selector;  
+  unsigned short __unused3;
+} fenv_t;
+
+
+/* FPU status word exception flags */
+#define FE_INVALID	0x01
+#define FE_DENORMAL	0x02
+#define FE_DIVBYZERO	0x04
+#define FE_OVERFLOW	0x08
+#define FE_UNDERFLOW	0x10
+#define FE_INEXACT	0x20
+#define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO \
+		       | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
+
+/* FPU control word rounding flags */
+#define FE_TONEAREST	0x0000
+#define FE_DOWNWARD	0x0400
+#define FE_UPWARD	0x0800
+#define FE_TOWARDZERO	0x0c00
+
+
+/* The default floating point environment */
+#define FE_DFL_ENV ((const fenv_t *)-1)
+
+
+#ifndef RC_INVOKED
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/*TODO: Some of these could be inlined */
+/* 7.6.2 Exception */
+
+extern int feclearexcept (int);
+extern int fegetexceptflag (fexcept_t * flagp, int excepts);
+extern int feraiseexcept (int excepts );
+extern int fesetexceptflag (const fexcept_t *, int);
+extern int fetestexcept (int excepts);
+
+
+/* 7.6.3 Rounding */
+
+extern int fegetround (void);
+extern int fesetround (int mode);
+
+
+/* 7.6.4 Environment */
+
+extern int fegetenv (fenv_t * envp);
+extern int fesetenv (const fenv_t * );
+extern int feupdateenv (const fenv_t *);
+extern int feholdexcept (fenv_t *);
+
+#ifdef __cplusplus
+}
+#endif
+#endif	/* Not RC_INVOKED */
+
+#endif /* ndef _FENV_H */