diff options
Diffstat (limited to 'include/ruby/util.h')
| -rw-r--r-- | include/ruby/util.h | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h index b2bc1a09f6..12e69c4b80 100644 --- a/include/ruby/util.h +++ b/include/ruby/util.h @@ -19,7 +19,7 @@ # include <stddef.h> /* size_t */ #endif -#if HAVE_SYS_TYPES_H +#ifdef HAVE_SYS_TYPES_H # include <sys/types.h> /* ssize_t */ #endif @@ -33,9 +33,20 @@ RBIMPL_SYMBOL_EXPORT_BEGIN() -/** an approximation of ceil(n * log10(2)), up to 65536 at least */ +/** an approximation of ceil(n * log10(2)), up to 1,048,576 (1<<20) + * without overflow within 32-bit calculation + */ #define DECIMAL_SIZE_OF_BITS(n) (((n) * 3010 + 9998) / 9999) +/** an approximation of decimal representation size for n-bytes */ +#define DECIMAL_SIZE_OF_BYTES(n) DECIMAL_SIZE_OF_BITS((n) * CHAR_BIT) + +/** + * An approximation of decimal representation size. `expr` may be a + * type name + */ +#define DECIMAL_SIZE_OF(expr) DECIMAL_SIZE_OF_BYTES(sizeof(expr)) + /** * Character to number mapping like `'a'` -> `10`, `'b'` -> `11` etc. For * punctuation etc., the value is -1. "36" terminology comes from the fact @@ -124,7 +135,7 @@ unsigned long ruby_scan_hex(const char *str, size_t len, size_t *ret); # define ruby_qsort qsort_r #else void ruby_qsort(void *, const size_t, const size_t, - int (*)(const void *, const void *, void *), void *); + int (*)(const void *, const void *, void *), void *); #endif RBIMPL_ATTR_NONNULL((1)) |