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sprintf.h
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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 */