diff options
Diffstat (limited to 'mrbgems/mruby-string-utf8/src')
| -rw-r--r-- | mrbgems/mruby-string-utf8/src/string.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/mrbgems/mruby-string-utf8/src/string.c b/mrbgems/mruby-string-utf8/src/string.c index 5379dd3aa..c377726a2 100644 --- a/mrbgems/mruby-string-utf8/src/string.c +++ b/mrbgems/mruby-string-utf8/src/string.c @@ -247,6 +247,38 @@ mrb_str_aref_m(mrb_state *mrb, mrb_value str) return mrb_str_aref(mrb, str, a1); } +static mrb_value +mrb_str_reverse_bang(mrb_state *mrb, mrb_value str) +{ + int utf8_len = mrb_utf8_strlen(str); + if (utf8_len > 1) { + int len = RSTRING_LEN(str); + char *buf = (char *)mrb_malloc(mrb, len); + unsigned char* p = (unsigned char*)buf; + unsigned char* e = (unsigned char*)buf + len; + unsigned char* r = (unsigned char*)RSTRING_END(str); + + memcpy(buf, RSTRING_PTR(str), len); + mrb_str_modify(mrb, mrb_str_ptr(str)); + + while (p<e) { + int clen = utf8len(p); + r -= clen; + memcpy(r, p, clen); + p += clen; + } + mrb_free(mrb, buf); + } + + return str; +} + +static mrb_value +mrb_str_reverse(mrb_state *mrb, mrb_value str) +{ + return mrb_str_reverse_bang(mrb, mrb_str_dup(mrb, str)); +} + void mrb_mruby_string_utf8_gem_init(mrb_state* mrb) { @@ -255,6 +287,8 @@ mrb_mruby_string_utf8_gem_init(mrb_state* mrb) mrb_define_method(mrb, s, "size", mrb_str_size, MRB_ARGS_NONE()); mrb_define_method(mrb, s, "[]", mrb_str_aref_m, MRB_ARGS_ANY()); mrb_define_method(mrb, s, "slice", mrb_str_aref_m, MRB_ARGS_ANY()); + mrb_define_method(mrb, s, "reverse", mrb_str_reverse, MRB_ARGS_NONE()); + mrb_define_method(mrb, s, "reverse!", mrb_str_reverse_bang, MRB_ARGS_NONE()); } void |