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#ifndef RBIMPL_INTERN_SPRINTF_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERN_SPRINTF_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.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.
* @brief Our own private `printf(3)`.
*/
#include "ruby/internal/attr/format.h"
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
/* sprintf.c */
/**
* Identical to rb_str_format(), except how the arguments are arranged.
*
* @param[in] argc Number of objects of `argv`.
* @param[in] argv A format string, followed by its arguments.
* @return A rendered new instance of ::rb_cString.
*
* @internal
*
* You can safely pass NULL to `argv`. Doesn't make any sense though.
*/
VALUE rb_f_sprintf(int argc, const VALUE *argv);
RBIMPL_ATTR_NONNULL((1))
RBIMPL_ATTR_FORMAT(RBIMPL_PRINTF_FORMAT, 1, 2)
/**
* 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:
*
* ```CXX
* rb_sprintf("|%"PRIsVALUE"|", RUBY_Qtrue); // => "|true|"
* rb_sprintf("%+"PRIsVALUE, rb_stdin); // => "#<IO:<STDIN>>"
* ```
*
* @param[in] fmt A `printf`-like format specifier.
* @param[in] ... Variadic number of contents to format.
* @return A rendered new instance of ::rb_cString.
*
* @internal
*
* :FIXME: We can improve this document.
*/
VALUE rb_sprintf(const char *fmt, ...);
RBIMPL_ATTR_NONNULL((1))
RBIMPL_ATTR_FORMAT(RBIMPL_PRINTF_FORMAT, 1, 0)
/**
* Identical to rb_sprintf(), except it takes a `va_list`.
*
* @param[in] fmt A `printf`-like format specifier.
* @param[in] ap Contents to format.
* @return A rendered new instance of ::rb_cString.
*/
VALUE rb_vsprintf(const char *fmt, va_list ap);
RBIMPL_ATTR_NONNULL((2))
RBIMPL_ATTR_FORMAT(RBIMPL_PRINTF_FORMAT, 2, 3)
/**
* Identical to rb_sprintf(), except it renders the output to the specified
* object rather than creating a new one.
*
* @param[out] dst String to modify.
* @param[in] fmt A `printf`-like format specifier.
* @param[in] ... Variadic number of contents to format.
* @exception rb_eTypeError `dst` is not a String.
* @return Passed `dst`.
* @post `dst` has the rendered output appended to its end.
*/
VALUE rb_str_catf(VALUE dst, const char *fmt, ...);
RBIMPL_ATTR_NONNULL((2))
RBIMPL_ATTR_FORMAT(RBIMPL_PRINTF_FORMAT, 2, 0)
/**
* 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.
*
* @param[out] dst String to modify.
* @param[in] fmt A `printf`-like format specifier.
* @param[in] ap Contents to format.
* @exception rb_eTypeError `dst` is not a String.
* @return Passed `dst`.
* @post `dst` has the rendered output appended to its end.
*/
VALUE rb_str_vcatf(VALUE dst, const char *fmt, va_list ap);
/**
* 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().
*
* @param[in] argc Number of objects in `argv`.
* @param[in] argv Format arguments.
* @param[in] fmt A printf-like format specifier.
* @exception rb_eTypeError `fmt` is not a string.
* @exception rb_eArgError Failed to parse `fmt`.
* @return A rendered new instance of ::rb_cString.
* @note Everything it takes must be Ruby objects.
*
*/
VALUE rb_str_format(int argc, const VALUE *argv, VALUE fmt);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_INTERN_SPRINTF_H */