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But the struct library will raise an error. --actboy168 发件人: Dirk Laurie Op Ma., 3 Sep. 2018 om 04:29 het actboy168 <actboy168@gmail.com> geskryf: > Lua 5.3.5 Copyright (C) 1994-2018 Lua.org, PUC-Rio > > > print(string.unpack('z', 'ABC')) > ABC 5 > This is not a zero-terminated string, so I think lua should raise an error. You are right that 'ABC' is not a zero-terminated string, but I do not agree that Lua should raise an error. The manual says 'All integral options check overflows; ... string.unpack checks whether the read value fits in a Lua integer.' There is no risk of overflow here, so an error should not be raised, and the manual almost says so: 'Options "c" and "z" are not aligned'. The string pack/unpack routines are taken from Roberto's 'struct' library http://www.inf.puc-rio.br/~roberto/struct/, which has been in existence for at least six years (timestamp on the makefile). BTW that library is a beautiful example of how to write C API code that compiles on all Lua versions from 5.0 to 5.4 with only this version-dependent test: #if (LUA_VERSION_NUM >= 502) #define luaL_register(L,n,f) luaL_newlib(L,f) #endif |