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string.c: add mrb_utf8_to_buf() to consolidate UTF-8 encoding

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Extract duplicated UTF-8 codepoint-to-bytes encoding into a shared
function in src/string.c. Update all gems to use it:

- mruby-sprintf: %c specifier
- mruby-io: putc
- mruby-string-ext: Integer#chr
- mruby-pack: pack("U")
- mruby-compiler: Unicode escapes in parser

Also use existing mrb_utf8len() in io.c for character length detection.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2025-12-18 16:30:03 +09:00
parent 53fce124e6
commit 7e28e68dca
8 changed files with 50 additions and 142 deletions
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include/mruby/internal.h
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@@ -166,6 +166,7 @@ mrb_value mrb_str_aref(mrb_state *mrb, mrb_value str, mrb_value idx, mrb_value l
uint32_t mrb_byte_hash(const uint8_t*, mrb_int);
uint32_t mrb_byte_hash_step(const uint8_t*, mrb_int, uint32_t);
mrb_int mrb_utf8_to_buf(char *buf, uint32_t cp);
#ifdef MRB_UTF8_STRING
mrb_int mrb_utf8len(const char *str, const char *end);
mrb_int mrb_utf8_strlen(const char *str, mrb_int byte_len);