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#ifndef RUBY_UTIL_H /*-*-C++-*-vi:se ft=cpp:*/ #define RUBY_UTIL_H 1 /** * @file * @author $Author$ * @date Thu Mar 9 11:55:53 JST 1995 * @copyright Copyright (C) 1993-2007 Yukihiro Matsumoto * @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 DO NOT ADD RANDOM GARBAGES IN THIS FILE! Contents of this file * reside here for historical reasons. Find a right place for your * API! */ #include "ruby/internal/config.h" #ifdef STDC_HEADERS # include <stddef.h> /* size_t */ #endif #if HAVE_SYS_TYPES_H # include <sys/types.h> /* ssize_t */ #endif #include "ruby/internal/attr/noalias.h" #include "ruby/internal/attr/nodiscard.h" #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/attr/restrict.h" #include "ruby/internal/attr/returns_nonnull.h" #include "ruby/internal/dllexport.h" #include "ruby/defines.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /** an approximation of ceil(n * log10(2)), up to 65536 at least */ #define DECIMAL_SIZE_OF_BITS(n) (((n) * 3010 + 9998) / 9999) /** * Character to number mapping like `'a'` -> `10`, `'b'` -> `11` etc. For * punctuation etc., the value is -1. "36" terminology comes from the fact * that this is the table behind `str.to_i(36)`. */ RUBY_EXTERN const signed char ruby_digit36_to_number_table[]; /** * Characters that Ruby accepts as hexadecimal digits. This is `/\h/` expanded * into an array. */ RUBY_EXTERN const char ruby_hexdigits[]; /** * Scans the passed string, assuming the string is a textual representation of * an integer. Stops when encountering something non-digit for the passed * base. * * @note This does not understand minus sign. * @note This does not understand e.g. `0x` prefix. * @note It is a failure to pass `0` to `base`, unlike ruby_strtoul(). * @param[in] str Target string of digits to interpret. * @param[in] len Number of bytes of `str`, or -1 to detect `NUL`. * @param[in] base Base, `2` to `36` inclusive. * @param[out] retlen Return value buffer. * @param[out] overflow Return value buffer. * @return Interpreted numeric representation of `str`. * @post `retlen` is the number of bytes scanned so far. * @post `overflow` is set to true if the string represents something * bigger than `ULONG_MAX`. Something meaningful still returns; * which is the designed belabour of C's unsigned arithmetic. */ unsigned long ruby_scan_digits(const char *str, ssize_t len, int base, size_t *retlen, int *overflow); /** @old{ruby_scan_oct} */ #define scan_oct(s,l,e) ((int)ruby_scan_oct((s),(l),(e))) RBIMPL_ATTR_NOALIAS() RBIMPL_ATTR_NONNULL(()) /** * Interprets the passed string as an octal unsigned integer. Stops when * encounters something not understood. * * @param[in] str C string to scan. * @param[in] len Length of `str`. * @param[out] consumed Return value buffer. * @return Parsed integer. * @post `ret` is the number of characters read. * * @internal * * No consideration is made for integer overflows. As the return value is * unsigned this function has fully defined behaviour, but you cannot know if * there was an integer wrap-around or not. */ unsigned long ruby_scan_oct(const char *str, size_t len, size_t *consumed); /** @old{ruby_scan_hex} */ #define scan_hex(s,l,e) ((int)ruby_scan_hex((s),(l),(e))) RBIMPL_ATTR_NONNULL(()) /** * Interprets the passed string a hexadecimal unsigned integer. Stops when * encounters something not understood. * * @param[in] str C string to scan. * @param[in] len Length of `str`. * @param[out] ret Return value buffer. * @return Parsed integer. * @post `ret` is the number of characters read. * * @internal * * No consideration is made for integer overflows. As the return value is * unsigned this function has fully defined behaviour, but you cannot know if * there was an integer wrap-around or not. */ unsigned long ruby_scan_hex(const char *str, size_t len, size_t *ret); /** * Reentrant implementation of quick sort. If your system provides something * (like C11 qsort_s), this is a thin wrapper of that routine. Otherwise * resorts to our own version. */ #ifdef HAVE_GNU_QSORT_R # define ruby_qsort qsort_r #else void ruby_qsort(void *, const size_t, const size_t, int (*)(const void *, const void *, void *), void *); #endif RBIMPL_ATTR_NONNULL((1)) /** * Sets an environment variable. In case of POSIX this is a wrapper of * `setenv(3)`. But there are systems which lack one. We try hard emulating. * * @param[in] key An environment variable. * @param[in] val A value to be associated with `key`, or 0. * @exception rb_eSystemCallError `setenv(3)` failed for some reason. * @post Environment variable `key` is created if necessary. Its value * is updated to be `val`. */ void ruby_setenv(const char *key, const char *val); RBIMPL_ATTR_NONNULL(()) /** * Deletes the passed environment variable, if any. * * @param[in] key An environment variable. * @exception rb_eSystemCallError `unsetenv(3)` failed for some reason. * @post Environment variable `key` does not exist. */ void ruby_unsetenv(const char *key); RBIMPL_ATTR_NODISCARD() RBIMPL_ATTR_RESTRICT() RBIMPL_ATTR_RETURNS_NONNULL() RBIMPL_ATTR_NONNULL(()) /** * This is our own version of `strdup(3)` that uses ruby_xmalloc() instead of * system malloc (benefits our GC). * * @param[in] str Target C string to duplicate. * @return An allocated C string holding the identical contents. * @note Return value must be discarded using ruby_xfree(). */ char *ruby_strdup(const char *str); #undef strdup /** * @alias{ruby_strdup} * * @internal * * @shyouhei doesn't think it is a wise idea. ruby_strdup()'s return value * must be passed to ruby_xfree(), but this macro makes it almost impossible. */ #define strdup(s) ruby_strdup(s) RBIMPL_ATTR_NODISCARD() RBIMPL_ATTR_RESTRICT() RBIMPL_ATTR_RETURNS_NONNULL() /** * This is our own version of `getcwd(3)` that uses ruby_xmalloc() instead of * system malloc (benefits our GC). * * @return An allocated C string holding the process working directory. * @note Return value must be discarded using ruby_xfree(). */ char *ruby_getcwd(void); RBIMPL_ATTR_NONNULL((1)) /** * Our own locale-insensitive version of `strtod(3)`. The conversion is done * as if the current locale is set to the "C" locale, no matter actual runtime * locale settings. * * @param[in] str Decimal or hexadecimal representation of a floating * point number. * @param[out] endptr NULL, or an arbitrary pointer (overwritten on return). * @return Converted number. * @post If `endptr` is not NULL, it is updated to point the first such * byte where conversion failed. * @note This function sets `errno` on failure. * - `ERANGE`: Converted integer is out of range of `double`. * @see William D. Clinger, "How to Read Floating Point Numbers * Accurately" in Proc. ACM SIGPLAN '90, pp. 92-101. * https://doi.org/10.1145/93542.93557 */ double ruby_strtod(const char *str, char **endptr); #undef strtod /** @alias{ruby_strtod} */ #define strtod(s,e) ruby_strtod((s),(e)) RBIMPL_ATTR_NONNULL((2)) /** * Scans the passed string, with calling the callback function every time it * encounters a "word". A word here is a series of characters separated by * either a space (of IEEE 1003.1 section 7.3.1.1), or a `','`. * * @param[in] str Target string to split into each words. * @param[in] func Callback function. * @param[in,out] argv Passed as-is to `func`. */ void ruby_each_words(const char *str, void (*func)(const char *word, int len, void *argv), void *argv); RBIMPL_SYMBOL_EXPORT_END() #endif /* RUBY_UTIL_H */