-- Copyright (C) Yichun Zhang (agentzh) local ffi = require "ffi" local base = require "resty.core.base" local C = ffi.C local ffi_str = ffi.string local ffi_copy = ffi.copy local byte = string.byte local str_find = string.find local get_string_buf = base.get_string_buf local subsystem = ngx.config.subsystem local _M = { version = base.version } if subsystem == "http" then ffi.cdef[[ void ngx_http_lua_ffi_str_replace_char(unsigned char *buf, size_t len, const unsigned char find, const unsigned char replace); ]] function _M.str_replace_char(str, find, replace) if not str_find(str, find, nil, true) then return str end local len = #str local buf = get_string_buf(len) ffi_copy(buf, str, len) C.ngx_http_lua_ffi_str_replace_char(buf, len, byte(find), byte(replace)) return ffi_str(buf, len) end end return _M