diff options
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/stdio.texi | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/manual/stdio.texi b/manual/stdio.texi index f9529a098d..8517653507 100644 --- a/manual/stdio.texi +++ b/manual/stdio.texi @@ -904,20 +904,16 @@ This function is a GNU extension. @standards{ISO, stdio.h} @safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{} @aculock{}}} This is just like @code{fputc}, except that it may be implemented as -a macro, making it faster. One consequence is that it may evaluate the -@var{stream} argument more than once, which is an exception to the -general rule for macros. Therefore, @var{stream} should never be an -expression with side-effects. +a macro and may evaluate the @var{stream} argument more than once. +Therefore, @var{stream} should never be an expression with side-effects. @end deftypefun @deftypefun wint_t putwc (wchar_t @var{wc}, FILE *@var{stream}) @standards{ISO, wchar.h} @safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{}}@acunsafe{@acucorrupt{} @aculock{}}} This is just like @code{fputwc}, except that it may be implemented as -a macro, making it faster. One consequence is that it may evaluate the -@var{stream} argument more than once, which is an exception to the -general rule for macros. Therefore, @var{stream} should never be an -expression with side-effects. +a macro and may evaluate the @var{stream} argument more than once. +Therefore, @var{stream} should never be an expression with side-effects. @end deftypefun @deftypefun int putc_unlocked (int @var{c}, FILE *@var{stream}) @@ -1110,20 +1106,17 @@ This function is a GNU extension. @deftypefun int getc (FILE *@var{stream}) @standards{ISO, stdio.h} @safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{}}@acunsafe{@aculock{} @acucorrupt{}}} -This is just like @code{fgetc}, except that it is permissible (and -typical) for it to be implemented as a macro that evaluates the -@var{stream} argument more than once. @code{getc} is often highly -optimized, so it is usually the best function to use to read a single -character. +This is just like @code{fgetc}, except that it may be implemented as +a macro and may evaluate the @var{stream} argument more than once. +Therefore, @var{stream} should never be an expression with side-effects. @end deftypefun @deftypefun wint_t getwc (FILE *@var{stream}) @standards{ISO, wchar.h} @safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{}}@acunsafe{@aculock{} @acucorrupt{}}} -This is just like @code{fgetwc}, except that it is permissible for it to -be implemented as a macro that evaluates the @var{stream} argument more -than once. @code{getwc} can be highly optimized, so it is usually the -best function to use to read a single wide character. +This is just like @code{fgetwc}, except that it may be implemented as +a macro and may evaluate the @var{stream} argument more than once. +Therefore, @var{stream} should never be an expression with side-effects. @end deftypefun @deftypefun int getc_unlocked (FILE *@var{stream}) |