sprintf.h File Reference

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Our own private printf(3). More...

#include "ruby/internal/attr/format.h"
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"

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Functions
VALUE	rb_f_sprintf (int argc, const VALUE *argv)
	Identical to rb_str_format(), except how the arguments are arranged.
VALUE	rb_sprintf (const char *fmt,...)
	Ruby's extended sprintf(3).
VALUE	rb_vsprintf (const char *fmt, va_list ap)
	Identical to rb_sprintf(), except it takes a va_list.
VALUE	rb_str_catf (VALUE dst, const char *fmt,...)
	Identical to rb_sprintf(), except it renders the output to the specified object rather than creating a new one.
VALUE	rb_str_vcatf (VALUE dst, const char *fmt, va_list ap)
	Identical to rb_str_catf(), except it takes a va_list.
VALUE	rb_str_format (int argc, const VALUE *argv, VALUE fmt)
	Formats a string.

Detailed Description

Our own private printf(3).

Author

Ruby developers ruby-.nosp@m.core.nosp@m.@ruby.nosp@m.-lan.nosp@m.g.org

Copyright

This file is a part of the programming language Ruby. Permission is hereby granted, to either redistribute and/or modify this file, provided that the conditions mentioned in the file COPYING are met. Consult the file for details.

Warning

Symbols prefixed with either RBIMPL or rbimpl are implementation details. Don't take them as canon. They could rapidly appear then vanish. The name (path) of this header file is also an implementation detail. Do not expect it to persist at the place it is now. Developers are free to move it anywhere anytime at will.

Note

To ruby-core: remember that this header can be possibly recursively included from extension libraries written in C++. Do not expect for instance __VA_ARGS__ is always available. We assume C99 for ruby itself but we don't assume languages of extension libraries. They could be written in C++98.

Definition in file sprintf.h.

Function Documentation

rb_f_sprintf()

VALUE rb_f_sprintf	(	int	argc,
		const VALUE *	argv
	)

Identical to rb_str_format(), except how the arguments are arranged.

Parameters

[in]	argc	Number of objects of argv.
[in]	argv	A format string, followed by its arguments.

Returns

A rendered new instance of rb_cString.

Definition at line 209 of file sprintf.c.

Referenced by rb_f_sprintf(), and rb_io_printf().

rb_sprintf()

VALUE rb_sprintf	(	const char *	fmt,
			...
	)

Ruby's extended sprintf(3).

We ended up reinventing the entire printf business because we don't want to depend on locales. OS-provided printf routines might or might not, which caused instabilities of the result strings.

The format sequence is a mixture of format specifiers and other verbatim contents. Each format specifier starts with a %, and has the following structure:

%[flags][width][.precision][length]conversion

This function supports flags of , #, +, -, 0, width of non-negative decimal integer and *, precision of non-negative decimal integers and *, length of L, h, t, z, l, ll, q, conversions of A, D, E, G, O, U, X, a, c, d, e, f, g, i, n, o, p, s, u, x, and %. In case of _WIN32 it also supports I. And additionally, it supports magical PRIsVALUE macro that can stringise arbitrary Ruby objects:

rb_sprintf("|%"PRIsVALUE"|", RUBY_Qtrue); // => "|true|"
rb_sprintf("%+"PRIsVALUE, rb_stdin);      // => "#<IO:<STDIN>>"

Parameters

[in]	fmt	A printf-like format specifier.
[in]	...	Variadic number of contents to format.

Returns

A rendered new instance of rb_cString.

Definition at line 1217 of file sprintf.c.

rb_str_catf()

VALUE rb_str_catf	(	VALUE	dst,
		const char *	fmt,
			...
	)

Identical to rb_sprintf(), except it renders the output to the specified object rather than creating a new one.

Parameters

[out]	dst	String to modify.
[in]	fmt	A printf-like format specifier.
[in]	...	Variadic number of contents to format.

Exceptions

rb_eTypeError

`dst` is not a String.

Returns

Passed dst.

Postcondition

dst has the rendered output appended to its end.

Definition at line 1240 of file sprintf.c.

rb_str_format()

VALUE rb_str_format	(	int	argc,
		const VALUE *	argv,
		VALUE	fmt
	)

Formats a string.

Returns the string resulting from applying fmt to argv. The format sequence is a mixture of format specifiers and other verbatim contents. Each format specifier starts with a %, and has the following structure:

%[flags][width][.precision]type

... which is different from that of rb_sprintf(). Because ruby has no short or long, there is no way to specify a "length" of an argument.

This function supports flags of , #, +, -, <>, {}, with of non-negative decimal integer and $, *, precision of non-negative decimal integer and $, *, type of A, B, E, G, X, a, b, c, d, e, f, g, i, o, p, s, u, x, %. This list is also (largely the same but) not identical to that of rb_sprintf().

Parameters

[in]	argc	Number of objects in argv.
[in]	argv	Format arguments.
[in]	fmt	A printf-like format specifier.

Exceptions

rb_eTypeError	`fmt` is not a string.
rb_eArgError	Failed to parse `fmt`.

Returns

A rendered new instance of rb_cString.

Note

Everything it takes must be Ruby objects.

Definition at line 215 of file sprintf.c.

Referenced by rb_f_sprintf(), and rb_str_format().

rb_str_vcatf()

VALUE rb_str_vcatf	(	VALUE	dst,
		const char *	fmt,
		va_list	ap
	)

Identical to rb_str_catf(), except it takes a va_list.

It can also be seen as a routine identical to rb_vsprintf(), except it renders the output to the specified object rather than creating a new one.

Parameters

[out]	dst	String to modify.
[in]	fmt	A printf-like format specifier.
[in]	ap	Contents to format.

Exceptions

rb_eTypeError

`dst` is not a String.

Returns

Passed dst.

Postcondition

dst has the rendered output appended to its end.

Definition at line 1230 of file sprintf.c.

rb_vsprintf()

VALUE rb_vsprintf	(	const char *	fmt,
		va_list	ap
	)

Identical to rb_sprintf(), except it takes a va_list.

Parameters

[in]	fmt	A printf-like format specifier.
[in]	ap	Contents to format.

Returns

A rendered new instance of rb_cString.

Definition at line 1211 of file sprintf.c.

Referenced by rb_fatal(), rb_frozen_error_raise(), rb_name_error(), rb_name_error_str(), rb_raise(), and rb_sprintf().