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Diffstat (limited to 'manual/stdio.texi')
| -rw-r--r-- | manual/stdio.texi | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/manual/stdio.texi b/manual/stdio.texi index 5c37698fc6..e3e3918731 100644 --- a/manual/stdio.texi +++ b/manual/stdio.texi @@ -2098,11 +2098,13 @@ The function to register a new output conversion is @comment GNU @deftypefun int register_printf_function (int @var{spec}, printf_function @var{handler-function}, printf_arginfo_function @var{arginfo-function}) This function defines the conversion specifier character @var{spec}. -Thus, if @var{spec} is @code{'z'}, it defines the conversion @samp{%z}. +Thus, if @var{spec} is @code{'Y'}, it defines the conversion @samp{%Y}. You can redefine the built-in conversions like @samp{%s}, but flag characters like @samp{#} and type modifiers like @samp{l} can never be used as conversions; calling @code{register_printf_function} for those -characters has no effect. +characters has no effect. It is advisable not to use lowercase letters, +since the ISO C standard warns that additional lowercase letters may be +standardized in future editions of the standard. The @var{handler-function} is the function called by @code{printf} and friends when this conversion appears in a template string. |