diff --git a/library/amiga.lib_rev.h b/library/amiga.lib_rev.h
index cb96262..3e7f384 100644
--- a/library/amiga.lib_rev.h
+++ b/library/amiga.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"amiga.lib 1.171"
-#define VSTRING		"amiga.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: amiga.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"amiga.lib 1.172"
+#define VSTRING		"amiga.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: amiga.lib 1.172 (21.8.2004)"
diff --git a/library/amiga.lib_rev.rev b/library/amiga.lib_rev.rev
index b34c321..730a054 100644
--- a/library/amiga.lib_rev.rev
+++ b/library/amiga.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/c.lib_rev.h b/library/c.lib_rev.h
index eb9bcbc..8fcf3e9 100644
--- a/library/c.lib_rev.h
+++ b/library/c.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"c.lib 1.171"
-#define VSTRING		"c.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: c.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"c.lib 1.172"
+#define VSTRING		"c.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: c.lib 1.172 (21.8.2004)"
diff --git a/library/c.lib_rev.rev b/library/c.lib_rev.rev
index b34c321..730a054 100644
--- a/library/c.lib_rev.rev
+++ b/library/c.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/changes b/library/changes
index 064b482..015530b 100644
--- a/library/changes
+++ b/library/changes
@@ -1,3 +1,20 @@
+c.lib 1.172 (21.8.2004)
+
+- acos() now returns 0 for a domain error.
+
+- asin() now returns 0 for a domain error.
+
+- atan2() now returns 0 for a domain error.
+
+- fmod() now returns x if y == 0 and sets a
+  domain error.
+
+- sqrt() now returns 0 for a domain error.
+
+- Added NaN and +Inf constants to the math library
+  initialization code which could come in handy later.
+
+
 c.lib 1.171 (16.8.2004)
 
 - Added "math_hypot.c"
diff --git a/library/debug.lib_rev.h b/library/debug.lib_rev.h
index 6820439..9a59ea3 100644
--- a/library/debug.lib_rev.h
+++ b/library/debug.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"debug.lib 1.171"
-#define VSTRING		"debug.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: debug.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"debug.lib 1.172"
+#define VSTRING		"debug.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: debug.lib 1.172 (21.8.2004)"
diff --git a/library/debug.lib_rev.rev b/library/debug.lib_rev.rev
index b34c321..730a054 100644
--- a/library/debug.lib_rev.rev
+++ b/library/debug.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/m.lib_rev.h b/library/m.lib_rev.h
index 97ebf78..62d39e9 100644
--- a/library/m.lib_rev.h
+++ b/library/m.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"m.lib 1.171"
-#define VSTRING		"m.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: m.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"m.lib 1.172"
+#define VSTRING		"m.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: m.lib 1.172 (21.8.2004)"
diff --git a/library/m.lib_rev.rev b/library/m.lib_rev.rev
index b34c321..730a054 100644
--- a/library/m.lib_rev.rev
+++ b/library/m.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/m881.lib_rev.h b/library/m881.lib_rev.h
index 2874f84..dd44538 100644
--- a/library/m881.lib_rev.h
+++ b/library/m881.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"m881.lib 1.171"
-#define VSTRING		"m881.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: m881.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"m881.lib 1.172"
+#define VSTRING		"m881.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: m881.lib 1.172 (21.8.2004)"
diff --git a/library/m881.lib_rev.rev b/library/m881.lib_rev.rev
index b34c321..730a054 100644
--- a/library/m881.lib_rev.rev
+++ b/library/m881.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/math_acos.c b/library/math_acos.c
index d920ff5..c034077 100644
--- a/library/math_acos.c
+++ b/library/math_acos.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_acos.c,v 1.1.1.1 2004-07-26 16:30:37 obarthel Exp $
+ * $Id: math_acos.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -226,7 +226,7 @@ acos(double x)
 	}
 	else
 	{
-		result = HUGE_VAL;
+		result = 0;
 		errno = EDOM;
 	}
 
diff --git a/library/math_asin.c b/library/math_asin.c
index 8237047..44ceca6 100644
--- a/library/math_asin.c
+++ b/library/math_asin.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_asin.c,v 1.1.1.1 2004-07-26 16:30:38 obarthel Exp $
+ * $Id: math_asin.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -237,7 +237,7 @@ asin(double x)
 	}
 	else
 	{
-		result = HUGE_VAL;
+		result = 0;
 		errno = EDOM;
 	}
 
diff --git a/library/math_atan2.c b/library/math_atan2.c
index 00a8ae7..5a0fce2 100644
--- a/library/math_atan2.c
+++ b/library/math_atan2.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_atan2.c,v 1.1.1.1 2004-07-26 16:30:39 obarthel Exp $
+ * $Id: math_atan2.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -107,7 +107,7 @@ __atan2(double x,double y)
 			}
 			else
 			{
-				result = HUGE_VAL;
+				result = 0;
 				errno = EDOM;
 			}
 		}
@@ -186,7 +186,7 @@ __atan2(double x,double y)
 			}
 			else
 			{
-				result = HUGE_VAL;
+				result = 0;
 				errno = EDOM;
 			}
 		}
@@ -201,9 +201,6 @@ __atan2(double x,double y)
 
 #if defined(PPC_FLOATING_POINT_SUPPORT)
 
-
-
-
 static const double 
 tiny  = 1.0e-300,
 zero  = 0.0,
@@ -326,15 +323,7 @@ atan2(double x,double y)
 {
 	double result;
 
-	if(x != 0.0 && y != 0.0)
-	{
-		result = __atan2(x,y);
-	}
-	else
-	{
-		result = HUGE_VAL;
-		errno = EDOM;
-	}
+	result = __atan2(x,y);
 
 	return(result);
 }
diff --git a/library/math_data.c b/library/math_data.c
index c946510..4d19d4a 100644
--- a/library/math_data.c
+++ b/library/math_data.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_data.c,v 1.1.1.1 2004-07-26 16:30:40 obarthel Exp $
+ * $Id: math_data.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -48,3 +48,5 @@ struct Library * MathIeeeDoubTransBase;
 /****************************************************************************/
 
 double __huge_val;
+double __not_a_number;
+double __infinity;
diff --git a/library/math_fmod.c b/library/math_fmod.c
index d20564d..b4cdbc6 100644
--- a/library/math_fmod.c
+++ b/library/math_fmod.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_fmod.c,v 1.1.1.1 2004-07-26 16:30:44 obarthel Exp $
+ * $Id: math_fmod.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -284,7 +284,7 @@ fmod(double x,double y)
 	}
 	else
 	{
-		result = HUGE_VAL;
+		result = x;
 		errno = EDOM;
 	}
 
diff --git a/library/math_headers.h b/library/math_headers.h
index 7a2cfb0..04a566b 100644
--- a/library/math_headers.h
+++ b/library/math_headers.h
@@ -1,5 +1,5 @@
 /*
- * $Id: math_headers.h,v 1.2 2004-08-12 12:31:16 obarthel Exp $
+ * $Id: math_headers.h,v 1.3 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -165,4 +165,9 @@ extern double __scalbn(double x, int n);
 
 /****************************************************************************/
 
+extern double __not_a_number;
+extern double __infinity;
+
+/****************************************************************************/
+
 #endif /* _MATH_HEADERS_H */
diff --git a/library/math_init_exit.c b/library/math_init_exit.c
index 3fb5edb..19ec455 100644
--- a/library/math_init_exit.c
+++ b/library/math_init_exit.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_init_exit.c,v 1.2 2004-08-08 10:55:57 obarthel Exp $
+ * $Id: math_init_exit.c,v 1.3 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -130,9 +130,23 @@ __math_init(void)
 			0x7f7fffff
 		};
 
+		static const unsigned long not_a_number[1] =
+		{
+			/* Exponent = 255 and fraction != 0.0 */
+			0x7fffffff
+		};
+
+		static const unsigned long infinity[1] =
+		{
+			/* Exponent = 255 and fraction = 0.0 */
+			0x7f800000
+		};
+
 		assert( sizeof(largest_fp_value) == sizeof(__huge_val) );
 
 		memmove((void *)&__huge_val,largest_fp_value,sizeof(largest_fp_value));
+		memmove((void *)&__not_a_number,not_a_number,sizeof(not_a_number));
+		memmove((void *)&__infinity,infinity,sizeof(infinity));
 	}
 	else if (sizeof(__huge_val) == 8) /* double precision */
 	{
@@ -142,9 +156,23 @@ __math_init(void)
 			0x7fefffff,0xffffffff
 		};
 
+		static const unsigned long not_a_number[2] =
+		{
+			/* Exponent = 2047 and fraction != 0.0 */
+			0x7fffffff,0xffffffff
+		};
+
+		static const unsigned long infinity[2] =
+		{
+			/* Exponent = 2047 and fraction = 0.0 */
+			0x7ff00000,0x00000000
+		};
+
 		assert( sizeof(largest_fp_value) == sizeof(__huge_val) );
 
 		memmove((void *)&__huge_val,largest_fp_value,sizeof(largest_fp_value));
+		memmove((void *)&__not_a_number,not_a_number,sizeof(not_a_number));
+		memmove((void *)&__infinity,infinity,sizeof(infinity));
 	}
 #if defined(USE_LONG_DOUBLE)
 	else if (sizeof(__huge_val) == 12) /* extended precision */
@@ -155,9 +183,23 @@ __math_init(void)
 			0x7ffe0000,0xffffffff,0xffffffff
 		};
 
+		static const unsigned long not_a_number[3] =
+		{
+			/* Exponent = 32767 and fraction != 0.0 */
+			0x7fff0000,0xffffffff,0xffffffff
+		};
+
+		static const unsigned long infinity[3] =
+		{
+			/* Exponent = 32767 and fraction = 0.0 */
+			0x7fff0000,0x00000000,0x00000000
+		};
+
 		assert( sizeof(largest_fp_value) == sizeof(__huge_val) );
 
 		memmove((void *)&__huge_val,largest_fp_value,sizeof(largest_fp_value));
+		memmove((void *)&__not_a_number,not_a_number,sizeof(not_a_number));
+		memmove((void *)&__infinity,infinity,sizeof(infinity));
 	}
 #endif /* USE_LONG_DOUBLE */
 
diff --git a/library/math_sqrt.c b/library/math_sqrt.c
index 59b5bae..a898606 100644
--- a/library/math_sqrt.c
+++ b/library/math_sqrt.c
@@ -1,5 +1,5 @@
 /*
- * $Id: math_sqrt.c,v 1.1.1.1 2004-07-26 16:30:53 obarthel Exp $
+ * $Id: math_sqrt.c,v 1.2 2004-08-21 18:57:40 obarthel Exp $
  *
  * :ts=4
  *
@@ -251,7 +251,7 @@ sqrt(double x)
 	}
 	else
 	{
-		result = HUGE_VAL;
+		result = 0;
 		errno = EDOM;
 	}
 
diff --git a/library/net.lib_rev.h b/library/net.lib_rev.h
index ad0d9c3..4eec714 100644
--- a/library/net.lib_rev.h
+++ b/library/net.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"net.lib 1.171"
-#define VSTRING		"net.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: net.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"net.lib 1.172"
+#define VSTRING		"net.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: net.lib 1.172 (21.8.2004)"
diff --git a/library/net.lib_rev.rev b/library/net.lib_rev.rev
index b34c321..730a054 100644
--- a/library/net.lib_rev.rev
+++ b/library/net.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/releasenotes b/library/releasenotes
index c78b103..9248488 100644
--- a/library/releasenotes
+++ b/library/releasenotes
@@ -1,3 +1,12 @@
+c.lib 1.172 (21.8.2004)
+
+- Changed the values which the acos(), asin(), atan2(), fmod()
+  and sqrt() functions return when they find that their parameters
+  are invalid.
+
+- The atan2() function failed to perform a correct parameter check.
+
+
 c.lib 1.171 (16.8.2004)
 
 - Added hypot()
diff --git a/library/stack.lib_rev.h b/library/stack.lib_rev.h
index 9cf0edd..c14d349 100644
--- a/library/stack.lib_rev.h
+++ b/library/stack.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"stack.lib 1.171"
-#define VSTRING		"stack.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: stack.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"stack.lib 1.172"
+#define VSTRING		"stack.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: stack.lib 1.172 (21.8.2004)"
diff --git a/library/stack.lib_rev.rev b/library/stack.lib_rev.rev
index b34c321..730a054 100644
--- a/library/stack.lib_rev.rev
+++ b/library/stack.lib_rev.rev
@@ -1 +1 @@
-171
+172
diff --git a/library/unix.lib_rev.h b/library/unix.lib_rev.h
index ad22adb..bef4051 100644
--- a/library/unix.lib_rev.h
+++ b/library/unix.lib_rev.h
@@ -1,6 +1,6 @@
 #define VERSION		1
-#define REVISION	171
-#define DATE		"16.8.2004"
-#define VERS		"unix.lib 1.171"
-#define VSTRING		"unix.lib 1.171 (16.8.2004)\r\n"
-#define VERSTAG		"\0$VER: unix.lib 1.171 (16.8.2004)"
+#define REVISION	172
+#define DATE		"21.8.2004"
+#define VERS		"unix.lib 1.172"
+#define VSTRING		"unix.lib 1.172 (21.8.2004)\r\n"
+#define VERSTAG		"\0$VER: unix.lib 1.172 (21.8.2004)"
diff --git a/library/unix.lib_rev.rev b/library/unix.lib_rev.rev
index b34c321..730a054 100644
--- a/library/unix.lib_rev.rev
+++ b/library/unix.lib_rev.rev
@@ -1 +1 @@
-171
+172