[PATCH] manual: Document %m instead of %a for formatted input.

[OndÅej BÃlka <neleai at seznam dot cz>]

Hi, this is one of patches that sit in bugzilla. It is relatively
straightforward improvement, only thing that I changed here is ommiting
that %m is GNU extension.

Comments?


2013-12-30  Ville Skytta  <ville.skytta@iki.fi>

	* manual/stdio.texi (Dynamic String Input): Recommend %m modifier instead of %a.

---
 manual/stdio.texi | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/manual/stdio.texi b/manual/stdio.texi
index 7957a2a..78bea79 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -3730,18 +3730,19 @@ input with a comprehensible error message, not with a crash.
 @node Dynamic String Input
 @subsection Dynamically Allocating String Conversions
 
-A GNU extension to formatted input lets you safely read a string with no
-maximum size.  Using this feature, you don't supply a buffer; instead,
-@code{scanf} allocates a buffer big enough to hold the data and gives
-you its address.  To use this feature, write @samp{a} as a flag
-character, as in @samp{%as} or @samp{%a[0-9a-z]}.
+A POSIX.1-2008 extension to formatted input lets you safely
+read a string with no maximum size.  Using this feature, you don't
+supply a buffer; instead, @code{scanf} allocates a buffer big enough
+to hold the data and gives you its address.  To use this feature,
+write @samp{m} as a flag character, as in @samp{%ms} or
+@samp{%m[0-9a-z]}.
 
 The pointer argument you supply for where to store the input should have
 type @code{char **}.  The @code{scanf} function allocates a buffer and
 stores its address in the word that the argument points to.  You should
 free the buffer with @code{free} when you no longer need it.
 
-Here is an example of using the @samp{a} flag with the @samp{%[@dots{}]}
+Here is an example of using the @samp{m} flag with the @samp{%[@dots{}]}
 conversion specification to read a ``variable assignment'' of the form
 @samp{@var{variable} = @var{value}}.
 
@@ -3749,7 +3750,7 @@ conversion specification to read a ``variable assignment'' of the form
 @{
   char *variable, *value;
 
-  if (2 > scanf ("%a[a-zA-Z0-9] = %a[^\n]\n",
+  if (2 > scanf ("%m[a-zA-Z0-9] = %m[^\n]\n",
 		 &variable, &value))
     @{
       invalid_input_error ();
-- 
1.8.3.1