diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/string.c | 64 |
1 files changed, 29 insertions, 35 deletions
diff --git a/src/string.c b/src/string.c index 7b58705dd..b980ee760 100644 --- a/src/string.c +++ b/src/string.c @@ -1674,6 +1674,18 @@ mrb_ptr_to_str(mrb_state *mrb, void *p) return mrb_obj_value(p_str); } +static inline void +str_reverse(char *p, char *e) +{ + char c; + + while (p < e) { + c = *p; + *p++ = *e; + *e-- = c; + } +} + /* 15.2.10.5.30 */ /* * call-seq: @@ -1684,53 +1696,35 @@ mrb_ptr_to_str(mrb_state *mrb, void *p) static mrb_value mrb_str_reverse_bang(mrb_state *mrb, mrb_value str) { + struct RString *s = mrb_str_ptr(str); + char *p, *e; + #ifdef MRB_UTF8_STRING mrb_int utf8_len = RSTRING_CHAR_LEN(str); - mrb_int len = RSTRING_LEN(str); - - if (utf8_len == len) goto bytes; - if (utf8_len > 1) { - char *buf; - char *p, *e, *r; - - mrb_str_modify(mrb, mrb_str_ptr(str)); - len = RSTRING_LEN(str); - buf = (char*)mrb_malloc(mrb, (size_t)len); - p = buf; - e = buf + len; - - memcpy(buf, RSTRING_PTR(str), len); - r = RSTRING_PTR(str) + len; + mrb_int len = RSTR_LEN(s); + if (utf8_len < 2) return str; + if (utf8_len < len) { + mrb_str_modify(mrb, s); + p = RSTR_PTR(s); + e = p + RSTR_LEN(s); while (p<e) { mrb_int clen = utf8len(p, e); - r -= clen; - memcpy(r, p, clen); + str_reverse(p, p + clen - 1); p += clen; } - mrb_free(mrb, buf); + goto bytes; } - return str; - - bytes: #endif - { - struct RString *s = mrb_str_ptr(str); - char *p, *e; - char c; + if (RSTR_LEN(s) > 1) { mrb_str_modify(mrb, s); - if (RSTR_LEN(s) > 1) { - p = RSTR_PTR(s); - e = p + RSTR_LEN(s) - 1; - while (p < e) { - c = *p; - *p++ = *e; - *e-- = c; - } - } - return str; + bytes: + p = RSTR_PTR(s); + e = p + RSTR_LEN(s) - 1; + str_reverse(p, e); } + return str; } /* ---------------------------------- */ |