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Fix manual regarding switch from read to write on streams.

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This commit is contained in:
Per Inge Mathisen 2011-05-11 23:43:26 -04:00 committed by Ulrich Drepper
parent e1fb097f44
commit 162ba701c2
2 changed files with 67 additions and 69 deletions
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6
NEWS
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@ -11,9 +11,9 @@ Version 2.14
386, 11257, 11258, 11487, 11532, 11578, 11653, 11668, 11724, 11945, 11947,
12158, 12178, 12200, 12346, 12393, 12420, 12445, 12449, 12454, 12460,
12469, 12489, 12509, 12510, 12518, 12541, 12545, 12551, 12583, 12587,
12597, 12611, 12625, 12631, 12650, 12653, 12655, 12660, 12681, 12685,
12711, 12713, 12714, 12717, 12723, 12734, 12738
12469, 12489, 12509, 12510, 12518, 12527, 12541, 12545, 12551, 12583,
12587, 12597, 12611, 12625, 12631, 12650, 12653, 12655, 12660, 12681,
12685, 12711, 12713, 12714, 12717, 12723, 12734, 12738
* The RPC implementation in libc is obsoleted. Old programs keep working
but new programs cannot be linked with the routines in libc anymore.

130
manual/stdio.texi
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@ -14,7 +14,7 @@ representing a communications channel to a file, device, or process.
@menu
* Streams:: About the data type representing a stream.
* Standard Streams:: Streams to the standard input and output
devices are created for you.
devices are created for you.
* Opening Streams:: How to create a stream to talk to a file.
* Closing Streams:: Close a stream when you are finished with it.
* Streams and Threads:: Issues with streams in threaded programs.
@ -26,17 +26,17 @@ representing a communications channel to a file, device, or process.
* Block Input/Output:: Input and output operations on blocks of data.
* Formatted Output:: @code{printf} and related functions.
* Customizing Printf:: You can define new conversion specifiers for
@code{printf} and friends.
@code{printf} and friends.
* Formatted Input:: @code{scanf} and related functions.
* EOF and Errors:: How you can tell if an I/O error happens.
* Error Recovery:: What you can do about errors.
* Binary Streams:: Some systems distinguish between text files
and binary files.
and binary files.
* File Positioning:: About random-access streams.
* Portable Positioning:: Random access on peculiar ISO C systems.
* Stream Buffering:: How to control buffering of streams.
* Other Kinds of Streams:: Streams that do not necessarily correspond
to an open file.
to an open file.
* Formatted Messages:: Print strictly formatted messages.
@end menu
@ -186,13 +186,11 @@ but output is always appended to the end of the file.
@end table
As you can see, @samp{+} requests a stream that can do both input and
output. The ISO standard says that when using such a stream, you must
call @code{fflush} (@pxref{Stream Buffering}) or a file positioning
function such as @code{fseek} (@pxref{File Positioning}) when switching
from reading to writing or vice versa. Otherwise, internal buffers
might not be emptied properly. The GNU C library does not have this
limitation; you can do arbitrary reading and writing operations on a
stream in whatever order.
output. When using such a stream, you must call @code{fflush}
(@pxref{Stream Buffering}) or a file positioning function such as
@code{fseek} (@pxref{File Positioning}) when switching from reading
to writing or vice versa. Otherwise, internal buffers might not be
emptied properly.
Additional characters may appear after these to specify flags for the
call. Always put the mode (@samp{r}, @samp{w+}, etc.) first; that is
@ -1109,17 +1107,17 @@ y_or_n_p (const char *question)
/* @r{Write a space to separate answer from question.} */
fputc (' ', stdout);
/* @r{Read the first character of the line.}
@r{This should be the answer character, but might not be.} */
@r{This should be the answer character, but might not be.} */
c = tolower (fgetc (stdin));
answer = c;
/* @r{Discard rest of input line.} */
while (c != '\n' && c != EOF)
c = fgetc (stdin);
c = fgetc (stdin);
/* @r{Obey the answer if it was valid.} */
if (answer == 'y')
return 1;
return 1;
if (answer == 'n')
return 0;
return 0;
/* @r{Answer was invalid: ask for valid answer.} */
fputs ("Please answer y or n:", stdout);
@}
@ -1328,7 +1326,7 @@ situation looks like this:
@smallexample
f o o b a r
^
^
@end smallexample
@noindent
@ -1340,7 +1338,7 @@ situation like this:
@smallexample
f o o b a r
|
|
o--
^
@end smallexample
@ -1354,7 +1352,7 @@ If you unread @samp{9} instead of @samp{o}, you get this situation:
@smallexample
f o o b a r
|
|
9--
^
@end smallexample
@ -1527,19 +1525,19 @@ useful for printing error messages, tables of data, and the like.
@menu
* Formatted Output Basics:: Some examples to get you started.
* Output Conversion Syntax:: General syntax of conversion
specifications.
specifications.
* Table of Output Conversions:: Summary of output conversions and
what they do.
what they do.
* Integer Conversions:: Details about formatting of integers.
* Floating-Point Conversions:: Details about formatting of
floating-point numbers.
floating-point numbers.
* Other Output Conversions:: Details about formatting of strings,
characters, pointers, and the like.
characters, pointers, and the like.
* Formatted Output Functions:: Descriptions of the actual functions.
* Dynamic Output:: Functions that allocate memory for the output.
* Variable Arguments Output:: @code{vprintf} and friends.
* Parsing a Template String:: What kinds of args does a given template
call for?
call for?
* Example of Parsing:: Sample program using @code{parse_printf_format}.
@end menu
@ -1561,7 +1559,7 @@ formatted and written to the output stream. For example,
int pct = 37;
char filename[] = "foo.txt";
printf ("Processing of `%s' is %d%% finished.\nPlease be patient.\n",
filename, pct);
filename, pct);
@end smallexample
@noindent
@ -2350,20 +2348,20 @@ make_message (char *name, char *value)
/* @r{Try to print in the allocated space.} */
nchars = snprintf (buffer, size, "value of %s is %s",
name, value);
name, value);
@end group
@group
if (nchars >= size)
@{
/* @r{Reallocate buffer now that we know
how much space is needed.} */
how much space is needed.} */
size = nchars + 1;
buffer = (char *) xrealloc (buffer, size);
if (buffer != NULL)
/* @r{Try again.} */
snprintf (buffer, size, "value of %s is %s",
name, value);
/* @r{Try again.} */
snprintf (buffer, size, "value of %s is %s",
name, value);
@}
/* @r{The last call worked, return the string.} */
return buffer;
@ -2452,7 +2450,7 @@ For example:
@smallexample
#define myprintf(a, b, c, d, e, rest...) \
printf (mytemplate , ## rest)
printf (mytemplate , ## rest)
@end smallexample
@noindent
@ -2594,7 +2592,7 @@ For example, take this declaration of @code{eprintf}:
@smallexample
void eprintf (const char *template, ...)
__attribute__ ((format (printf, 1, 2)));
__attribute__ ((format (printf, 1, 2)));
@end smallexample
@noindent
@ -2781,30 +2779,30 @@ validate_args (char *format, int nargs, OBJECT *args)
int wanted;
if (argtypes[i] & PA_FLAG_PTR)
wanted = STRUCTURE;
wanted = STRUCTURE;
else
switch (argtypes[i] & ~PA_FLAG_MASK)
@{
case PA_INT:
case PA_FLOAT:
case PA_DOUBLE:
wanted = NUMBER;
break;
case PA_CHAR:
wanted = CHAR;
break;
case PA_STRING:
wanted = STRING;
break;
case PA_POINTER:
wanted = STRUCTURE;
break;
@}
switch (argtypes[i] & ~PA_FLAG_MASK)
@{
case PA_INT:
case PA_FLOAT:
case PA_DOUBLE:
wanted = NUMBER;
break;
case PA_CHAR:
wanted = CHAR;
break;
case PA_STRING:
wanted = STRING;
break;
case PA_POINTER:
wanted = STRUCTURE;
break;
@}
if (TYPE (args[i]) != wanted)
@{
error ("type mismatch for arg number %d", i);
return 0;
@}
@{
error ("type mismatch for arg number %d", i);
return 0;
@}
@}
return 1;
@}
@ -2835,15 +2833,15 @@ The facilities of this section are declared in the header file
@menu
* Registering New Conversions:: Using @code{register_printf_function}
to register a new output conversion.
to register a new output conversion.
* Conversion Specifier Options:: The handler must be able to get
the options specified in the
template when it is called.
the options specified in the
template when it is called.
* Defining the Output Handler:: Defining the handler and arginfo
functions that are passed as arguments
to @code{register_printf_function}.
functions that are passed as arguments
to @code{register_printf_function}.
* Printf Extension Example:: How to define a @code{printf}
handler function.
handler function.
* Predefined Printf Handlers:: Predefined @code{printf} handlers.
@end menu
@ -3010,7 +3008,7 @@ You should define your handler functions with a prototype like:
@smallexample
int @var{function} (FILE *stream, const struct printf_info *info,
const void *const *args)
const void *const *args)
@end smallexample
The @var{stream} argument passed to the handler function is the stream to
@ -3058,7 +3056,7 @@ You have to define these functions with a prototype like:
@smallexample
int @var{function} (const struct printf_info *info,
size_t n, int *argtypes)
size_t n, int *argtypes)
@end smallexample
The return value from the function should be the number of arguments the
@ -3728,7 +3726,7 @@ conversion specification to read a ``variable assignment'' of the form
char *variable, *value;
if (2 > scanf ("%a[a-zA-Z0-9] = %a[^\n]\n",
&variable, &value))
&variable, &value))
@{
invalid_input_error ();
return 0;
@ -4781,10 +4779,10 @@ provide equivalent functionality.
@menu
* String Streams:: Streams that get data from or put data in
a string or memory buffer.
a string or memory buffer.
* Obstack Streams:: Streams that store data in an obstack.
* Custom Streams:: Defining your own streams with an arbitrary
input data source and/or output data sink.
input data source and/or output data sink.
@end menu
@node String Streams
@ -4958,9 +4956,9 @@ and types described here are all GNU extensions.
@menu
* Streams and Cookies:: The @dfn{cookie} records where to fetch or
store data that is read or written.
store data that is read or written.
* Hook Functions:: How you should define the four @dfn{hook
functions} that a custom stream needs.
functions} that a custom stream needs.
@end menu
@node Streams and Cookies