onigenc_step_back  217 include/ruby/encoding.h #define rb_enc_step_back(s,p,e,n,enc) ((char *)onigenc_step_back((enc),(UChar*)(s),(UChar*)(p),(UChar*)(e),(int)(n)))
onigenc_step_back  296 include/ruby/oniguruma.h         onigenc_step_back((enc),(start),(s),(end),(n))
onigenc_step_back  360 include/ruby/oniguruma.h OnigUChar* onigenc_step_back P_((OnigEncoding enc, const OnigUChar* start, const OnigUChar* s, const OnigUChar* end, int n));