The current description in the memccpy.3 man page:
The memccpy() function copies no more than n bytes from memory
area src to memory area dest, stopping when the character c is found.
If the memory areas overlap, the results are undefined.
doesn't clearly say whether the final character c is copied or not. (It is.)
This patch copies the description from POSIX
https://pubs.opengroup.org/onlinepubs/9699919799/functions/memccpy.html
with the parameter names and added paragraph break retained from the
current version. The updated description is:
The memccpy() function copies bytes from memory area src into
dest, stopping after the first occurrence of byte c (converted to an
unsigned char) is copied, or after n bytes are copied, whichever comes
first.
If copying takes place between objects that overlap, the
behavior is undefined.
I have not (yet) checked whether there are similar ambiguities in
other man pages.
Patch follows:
diff --git man/man3/memccpy.3 man/man3/memccpy.3
index 0ba805176..057890f7e 100644
--- man/man3/memccpy.3
+++ man/man3/memccpy.3
@@ -23,20 +23,22 @@ Standard C library
.fi
.SH DESCRIPTION
The
-.BR memccpy ()
-function copies no more than
-.I n
-bytes from
-memory area
+.BR memccpy()
+function copies bytes from memory area
.I src
-to memory area
+into
.IR dest ,
-stopping when the
-character
+stopping after the first occurrence of byte
.I c
-is found.
+(converted to an
+.BR "unsigned char" )
+is copied, or after
+.I n
+bytes are copied, whichever
+comes first.
.P
-If the memory areas overlap, the results are undefined.
+If copying takes place between objects that overlap,
+the behavior is undefined.
.SH RETURN VALUE
The
.BR memccpy ()
