diff --git a/doc/funcref.sgml b/doc/funcref.sgml
index 60b69409c..ea04ad701 100644
--- a/doc/funcref.sgml
+++ b/doc/funcref.sgml
@@ -2321,9 +2321,9 @@ to undefined behaviour.
 <tag/Function/Check if a given character is a letter or digit.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isalnum (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a letter or digit. The return value is non zero if the character
-is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a letter or digit. The return value is zero if the character is anything 
+else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2359,8 +2359,8 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a letter.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isalpha (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a letter. The return value is non zero if the character is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a letter. The return value is zero if the character is anything else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2396,9 +2396,8 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is in the ASCII (0..127) range.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isascii (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is in the range 0..127 (the range of valid ASCII characters) and a non zero
-value if not.
+<tag/Description/The function returns a non zero value if the given argument
+is in the range 0..127 (the range of valid ASCII characters) and zero if not.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2434,9 +2433,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a space or tab.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isblank (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a space or tab character. The return value is non zero if the character
-is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a space or tab character. The return value is zero if the character is
+anything else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2472,9 +2471,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a control character.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ iscntrl (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a control character. The return value is non zero if the character
-is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a control character. The return value is zero if the character is anything
+else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2510,8 +2509,8 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a digit.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isdigit (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a digit. The return value is non zero if the character is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a digit. The return value is zero if the character is anything else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2548,9 +2547,9 @@ fastcall function, so it may only be used in presence of a prototype.
 space).
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isgraph (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a printable character with the exception of space. The return value is non
-zero if the character is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a printable character with the exception of space. The return value is zero
+if the character is anything else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2586,9 +2585,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a lower case letter.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ islower (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a lower case letter. The return value is non zero if the character is
-anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a lower case letter. The return value is zero if the character is anything 
+else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2624,9 +2623,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a printable character.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isprint (int c);/
-<tag/Description/The function returns a value of zero if the given argument
+<tag/Description/The function returns a non zero value if the given argument
 is a printable character (this includes the space character). The return value
-is non zero if the character is anything else.
+is zero if the character is anything else.         
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2663,9 +2662,9 @@ fastcall function, so it may only be used in presence of a prototype.
 space or an alphanumeric character.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ ispunct (int c);/
-<tag/Description/The function returns a value of zero if the given argument
+<tag/Description/The function returns a non zero value if the given argument
 is a printable character, but not a space or anything alphanumeric. The return
-value is non zero if the character is anything else.
+value is zero if the character is anything else.   
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2701,8 +2700,8 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a a white-space character.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isspace (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a white space character. The return value is non zero if the character is
+<tag/Description/The function returns a non zero value if the given argument
+is a white space character. The return value is zero if the character is
 anything else. The standard white space characters are: space, formfeed ('\f'),
 newline ('\n'), carriage return ('\r'), horizontal tab ('\t'), and vertical tab
 ('\v').
@@ -2741,9 +2740,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is an upper case letter.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isupper (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is an upper case letter. The return value is non zero if the character is
-anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is an upper case letter. The return value is zero if the character is anything 
+else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values
@@ -2779,9 +2778,9 @@ fastcall function, so it may only be used in presence of a prototype.
 <tag/Function/Check if a given character is a hexadecimal digit.
 <tag/Header/<tt/<ref id="ctype.h" name="ctype.h">/
 <tag/Declaration/<tt/int __fastcall__ isxdigit (int c);/
-<tag/Description/The function returns a value of zero if the given argument
-is a hexadecimal digit (0..9, a..f and A..F). The return value is non zero
-if the character is anything else.
+<tag/Description/The function returns a non zero value if the given argument
+is a hexadecimal digit (0..9, a..f and A..F). The return value is zero if the 
+character is anything else.
 <tag/Limits/<itemize>
 <item>When compiling with <tt/-Os/ the function is actually a macro. The
 inline sequence generated by the macro will not work correctly for values