jbe@79: 
jbe@79: #include <stdlib.h>
jbe@79: #include <unistd.h>
jbe@79: #include <stdint.h>
jbe@79: #include <errno.h>
jbe@79: #include <string.h>
jbe@79: #include <stdio.h>
jbe@79: #include <time.h>
jbe@79: #include <sys/time.h>
jbe@79: #include <sys/socket.h>
jbe@79: #include <sys/select.h>
jbe@81: #include <fcntl.h>
jbe@79: 
jbe@79: #include <lua.h>
jbe@79: #include <lauxlib.h>
jbe@79: #include <lualib.h>
jbe@79: 
jbe@80: #define MOONBR_IO_MAXSTRERRORLEN 80
jbe@80: #define MOONBR_IO_WRITEBUFLEN 4096
jbe@80: 
jbe@80: #define moonbr_io_errmsg() \
jbe@80:   char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \
jbe@80:   strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)
jbe@80: 
jbe@80: 
jbe@79: #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"
jbe@79: #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"
jbe@79: 
jbe@79: typedef struct {
jbe@79:   int fd;
jbe@84:   int issocket;
jbe@81:   int nonblocking;
jbe@81:   int writeerr;
jbe@83:   size_t writeleft;
jbe@83: #if LUA_VERSION_NUM >= 503
jbe@83:   lua_Integer writeqin;
jbe@83:   lua_Integer writeqout;
jbe@83: #else
jbe@83:   int writeqin;
jbe@83:   int writeqout;
jbe@83: #endif
jbe@83:   size_t writeqoff;
jbe@81:   int writebufcnt;
jbe@80:   char writebuf[MOONBR_IO_WRITEBUFLEN];
jbe@79: } moonbr_io_handle_t;
jbe@79: 
jbe@81: static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {
jbe@81:   if (handle->nonblocking != nonblocking) {
jbe@81:     int flags;
jbe@81:     flags = fcntl(handle->fd, F_GETFL, 0);
jbe@81:     if (flags == -1) {
jbe@81:       moonbr_io_errmsg();
jbe@81:       luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81:     }
jbe@81:     if (nonblocking) flags |= O_NONBLOCK;
jbe@81:     else flags &= ~O_NONBLOCK;
jbe@81:     if (fcntl(handle->fd, F_SETFL, flags) == -1) {
jbe@81:       moonbr_io_errmsg();
jbe@81:       luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81:     }
jbe@81:   }
jbe@81: }
jbe@81: 
jbe@81: static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {
jbe@80:   moonbr_io_handle_t *handle;
jbe@80:   int i, top;
jbe@80:   const char *str;
jbe@81:   size_t strlen, strpos;
jbe@80:   size_t written;
jbe@80:   ssize_t result;
jbe@80:   handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83:   if (handle->fd < 0) luaL_error(L, "Attempt to write to a closed I/O handle");
jbe@81:   if (handle->writeerr) {
jbe@80:     lua_pushnil(L);
jbe@80:     lua_pushliteral(L, "Previous write error");
jbe@80:     return 2;
jbe@80:   }
jbe@81:   moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
jbe@84:   top = lua_gettop(L);
jbe@81:   lua_getuservalue(L, 1);
jbe@81:   lua_getfield(L, -1, "writebuf");
jbe@84:   for (i=2; i<=top; i++) {
jbe@84:     luaL_checklstring(L, i, &strlen);
jbe@84:     lua_pushvalue(L, i);
jbe@84:     lua_rawseti(L, -2, handle->writeqin++);
jbe@84:     handle->writeleft += strlen;
jbe@81:   }
jbe@83:   while (handle->writeqout != handle->writeqin) {
jbe@83:     lua_rawgeti(L, -1, handle->writeqout);
jbe@81:     str = lua_tolstring(L, -1, &strlen);
jbe@81:     strpos = handle->writeqoff;
jbe@81:     while (strpos < strlen) {
jbe@81:       if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {
jbe@81:         memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);
jbe@81:         handle->writebufcnt += strlen - strpos;
jbe@80:         break;
jbe@80:       } else {
jbe@80:         written = 0;
jbe@81:         memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);
jbe@81:         strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;
jbe@80:         while (written < MOONBR_IO_WRITEBUFLEN) {
jbe@80:           result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);
jbe@80:           if (result < 0) {
jbe@81:             if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81:               if (written) {
jbe@81:                 handle->writebufcnt -= written;
jbe@81:                 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81:               }
jbe@81:               handle->writeqoff = strpos;
jbe@81:               goto moonbr_io_write_impl_block;
jbe@81:             } else if (errno != EINTR) {
jbe@80:               moonbr_io_errmsg();
jbe@81:               handle->writeerr = 1;
jbe@80:               lua_pushnil(L);
jbe@80:               lua_pushstring(L, errmsg);
jbe@80:               return 2;
jbe@80:             }
jbe@80:           } else {
jbe@80:             written += result;
jbe@81:             handle->writeleft -= result;
jbe@80:           }
jbe@80:         }
jbe@81:         handle->writebufcnt = 0;
jbe@80:       }
jbe@80:     }
jbe@81:     handle->writeqoff = 0;
jbe@81:     lua_pop(L, 1);
jbe@81:     lua_pushnil(L);
jbe@83:     lua_rawseti(L, -2, handle->writeqout++);
jbe@80:   }
jbe@81:   if (flush) {
jbe@81:     written = 0;
jbe@81:     while (written < handle->writebufcnt) {
jbe@81:       result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);
jbe@81:       if (result < 0) {
jbe@81:         if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81:           if (written) {
jbe@81:             handle->writebufcnt -= written;
jbe@81:             memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81:           }
jbe@81:           goto moonbr_io_write_impl_block;
jbe@81:         } else if (errno != EINTR) {
jbe@81:           moonbr_io_errmsg();
jbe@81:           handle->writeerr = -1;
jbe@81:           lua_pushnil(L);
jbe@81:           lua_pushstring(L, errmsg);
jbe@81:           return 2;
jbe@81:         }
jbe@81:       } else {
jbe@81:         written += result;
jbe@81:         handle->writeleft -= result;
jbe@81:       }
jbe@81:     }
jbe@81:     handle->writebufcnt = 0;
jbe@82:     if (nonblocking) lua_pushinteger(L, 0);
jbe@81:   } else {
jbe@82:     if (nonblocking) lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81:   }
jbe@82:   if (!nonblocking) lua_pushvalue(L, 1);
jbe@80:   return 1;
jbe@81:   moonbr_io_write_impl_block:
jbe@81:   if (flush) lua_pushinteger(L, handle->writeleft);
jbe@81:   else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81:   return 1;
jbe@81: }
jbe@81: 
jbe@81: static int moonbr_io_write(lua_State *L) {
jbe@81:   return moonbr_io_write_impl(L, 0, 0);
jbe@81: }
jbe@81: 
jbe@81: static int moonbr_io_write_nb(lua_State *L) {
jbe@81:   return moonbr_io_write_impl(L, 1, 0);
jbe@80: }
jbe@80: 
jbe@80: static int moonbr_io_flush(lua_State *L) {
jbe@81:   return moonbr_io_write_impl(L, 0, 1);
jbe@81: }
jbe@81: 
jbe@81: static int moonbr_io_flush_nb(lua_State *L) {
jbe@81:   return moonbr_io_write_impl(L, 1, 1);
jbe@80: }
jbe@80: 
jbe@84: static int moonbr_io_close_impl(lua_State *L, int clean) {
jbe@83:   moonbr_io_handle_t *handle;
jbe@83:   handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83:   if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");
jbe@84:   if (clean && handle->writeleft) {
jbe@83:     lua_pushcfunction(L, moonbr_io_flush);
jbe@83:     lua_pushvalue(L, 1);
jbe@83:     lua_call(L, 1, 2);
jbe@83:     if (!lua_toboolean(L, -2)) {
jbe@83:       close(handle->fd);
jbe@83:       handle->fd = -1;
jbe@83:       return 2;
jbe@83:     }
jbe@83:   }
jbe@83:   if (close(handle->fd)) {
jbe@83:     moonbr_io_errmsg();
jbe@83:     handle->fd = -1;
jbe@83:     lua_pushnil(L);
jbe@83:     lua_pushstring(L, errmsg);
jbe@83:     return 2;
jbe@83:   }
jbe@83:   handle->fd = -1;
jbe@83:   lua_pushboolean(L, 1);
jbe@83:   return 1;
jbe@84: 
jbe@83: }
jbe@83: 
jbe@84: static int moonbr_io_reset(lua_State *L) {
jbe@84:   return moonbr_io_close_impl(L, 0);
jbe@84: }
jbe@84: 
jbe@84: static int moonbr_io_close(lua_State *L) {
jbe@84:   return moonbr_io_close_impl(L, 1);
jbe@84: }
jbe@84: 
jbe@84: void moonbr_io_pushhandle(lua_State *L, int fd, int issocket) {
jbe@79:   moonbr_io_handle_t *handle;
jbe@79:   handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
jbe@79:   handle->fd = fd;
jbe@84:   handle->issocket = issocket;
jbe@81:   handle->nonblocking = -1;
jbe@81:   handle->writeerr = 0;
jbe@81:   handle->writeleft = 0;
jbe@83:   handle->writeqin = 0;
jbe@83:   handle->writeqout = 0;
jbe@81:   handle->writeqoff = 0;
jbe@81:   handle->writebufcnt = 0;
jbe@79:   luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79:   lua_setmetatable(L, -2);
jbe@79:   lua_newtable(L);  // uservalue
jbe@81:   lua_newtable(L);
jbe@81:   lua_setfield(L, -2, "writebuf");
jbe@79:   lua_newtable(L);  // public
jbe@79:   luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79:   lua_setmetatable(L, -2);
jbe@79:   lua_setfield(L, -2, "public");
jbe@79:   lua_setuservalue(L, -2);
jbe@79: }
jbe@79: 
jbe@79: static int moonbr_io_handleindex(lua_State *L) {
jbe@80:   luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79:   lua_getuservalue(L, 1);
jbe@79:   lua_getfield(L, -1, "public");
jbe@79:   lua_pushvalue(L, 2);
jbe@79:   lua_gettable(L, -2);
jbe@79:   return 1;
jbe@79: }
jbe@79: 
jbe@79: static int moonbr_io_handlenewindex(lua_State *L) {
jbe@80:   luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79:   lua_getuservalue(L, 1);
jbe@79:   lua_getfield(L, -1, "public");
jbe@79:   lua_pushvalue(L, 2);
jbe@79:   lua_pushvalue(L, 3);
jbe@79:   lua_settable(L, -3);
jbe@79:   return 0;
jbe@79: }
jbe@79: 
jbe@80: static int moonbr_io_handlegc(lua_State *L) {
jbe@80:   moonbr_io_handle_t *handle;
jbe@80:   handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80:   if (handle->fd >= 0) {
jbe@80:     lua_getuservalue(L, 1);
jbe@80:     lua_getfield(L, -1, "gc");
jbe@80:     lua_pushvalue(L, 1);
jbe@80:     lua_call(L, 1, 0);
jbe@80:   }
jbe@80:   return 0;
jbe@80: }
jbe@80: 
jbe@79: static int moonbr_io_getdummy(lua_State *L) {
jbe@80:   moonbr_io_pushhandle(L, 2, 0);
jbe@79:   return 1;
jbe@79: }
jbe@79: 
jbe@79: static const struct luaL_Reg moonbr_io_handle_methods[] = {
jbe@84:   {"reset", moonbr_io_reset},
jbe@80:   {"close", moonbr_io_close},
jbe@80:   {"write", moonbr_io_write},
jbe@81:   {"write_nb", moonbr_io_write_nb},
jbe@80:   {"flush", moonbr_io_flush},
jbe@81:   {"flush_nb", moonbr_io_flush_nb},
jbe@79:   {NULL, NULL}
jbe@79: };
jbe@79: 
jbe@79: static const struct luaL_Reg moonbr_io_handle_metamethods[] = {
jbe@79:   {"__index", moonbr_io_handleindex},
jbe@79:   {"__newindex", moonbr_io_handlenewindex},
jbe@80:   {"__gc", moonbr_io_handlegc},
jbe@79:   {NULL, NULL}
jbe@79: };
jbe@79: 
jbe@79: static const struct luaL_Reg moonbr_io_module_funcs[] = {
jbe@79:   {"getdummy", moonbr_io_getdummy},
jbe@79:   {NULL, NULL}
jbe@79: };
jbe@79: 
jbe@79: int luaopen_moonbridge_io(lua_State *L) {
jbe@79: 
jbe@80:   lua_newtable(L);  // module
jbe@80: 
jbe@79:   lua_newtable(L);  // public metatable
jbe@79:   lua_newtable(L);  // handle methods
jbe@79:   luaL_setfuncs(L, moonbr_io_handle_methods, 0);
jbe@80:   lua_pushvalue(L, -1);
jbe@80:   lua_setfield(L, -4, "handle");
jbe@79:   lua_setfield(L, -2, "__index");
jbe@79:   lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79: 
jbe@79:   lua_newtable(L);  // handle metatable
jbe@79:   luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);
jbe@79:   lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79: 
jbe@79:   luaL_setfuncs(L, moonbr_io_module_funcs, 0);
jbe@79:   return 1;
jbe@79: 
jbe@79: }
jbe@79: