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@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@80:   int writecnt;
jbe@80:   char writebuf[MOONBR_IO_WRITEBUFLEN];
jbe@79: } moonbr_io_handle_t;
jbe@79: 
jbe@80: static int moonbr_io_close(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) luaL_error(L, "Attempt to close a closed I/O handle");
jbe@80:   if (close(handle->fd)) {
jbe@80:     handle->fd = -1;
jbe@80:     moonbr_io_errmsg();
jbe@80:     lua_pushnil(L);
jbe@80:     lua_pushstring(L, errmsg);
jbe@80:     return 2;
jbe@80:   }
jbe@80:   handle->fd = -1;
jbe@80:   lua_pushboolean(L, 1);
jbe@80:   return 1;
jbe@80: }
jbe@80: 
jbe@80: static int moonbr_io_write(lua_State *L) {
jbe@80:   moonbr_io_handle_t *handle;
jbe@80:   int i, top;
jbe@80:   const char *str;
jbe@80:   size_t strlen;
jbe@80:   size_t written;
jbe@80:   ssize_t result;
jbe@80:   handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80:   if (handle->writecnt < 0) {
jbe@80:     lua_pushnil(L);
jbe@80:     lua_pushliteral(L, "Previous write error");
jbe@80:     return 2;
jbe@80:   }
jbe@80:   top = lua_gettop(L);
jbe@80:   for (i=2; i<=top; i++) {
jbe@80:     str = luaL_checklstring(L, i, &strlen);
jbe@80:     while (strlen) {
jbe@80:       if (strlen < MOONBR_IO_WRITEBUFLEN - handle->writecnt) {
jbe@80:         memcpy(handle->writebuf + handle->writecnt, str, strlen);
jbe@80:         handle->writecnt += strlen;
jbe@80:         break;
jbe@80:       } else {
jbe@80:         written = 0;
jbe@80:         memcpy(handle->writebuf + handle->writecnt, str, MOONBR_IO_WRITEBUFLEN - handle->writecnt);
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@80:             if (errno != EINTR) {
jbe@80:               moonbr_io_errmsg();
jbe@80:               handle->writecnt = -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@80:           }
jbe@80:         }
jbe@80:         str += MOONBR_IO_WRITEBUFLEN - handle->writecnt;
jbe@80:         strlen -= MOONBR_IO_WRITEBUFLEN - handle->writecnt;
jbe@80:         handle->writecnt = 0;
jbe@80:       }
jbe@80:     }
jbe@80:   }
jbe@80:   lua_settop(L, 1);
jbe@80:   return 1;
jbe@80: }
jbe@80: 
jbe@80: static int moonbr_io_flush(lua_State *L) {
jbe@80:   moonbr_io_handle_t *handle;
jbe@80:   size_t written;
jbe@80:   ssize_t result;
jbe@80:   handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80:   if (handle->writecnt < 0) {
jbe@80:     lua_pushnil(L);
jbe@80:     lua_pushliteral(L, "Previous write error");
jbe@80:     return 2;
jbe@80:   }
jbe@80:   written = 0;
jbe@80:   while (written < handle->writecnt) {
jbe@80:     result = write(handle->fd, handle->writebuf + written, handle->writecnt - written);
jbe@80:     if (result < 0) {
jbe@80:       if (errno != EINTR) {
jbe@80:         moonbr_io_errmsg();
jbe@80:         handle->writecnt = -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@80:     }
jbe@80:   }
jbe@80:   handle->writecnt = 0;
jbe@80:   lua_settop(L, 1);
jbe@80:   return 1;
jbe@80: }
jbe@80: 
jbe@80: void moonbr_io_pushhandle(lua_State *L, int fd, int gc_idx) {
jbe@79:   moonbr_io_handle_t *handle;
jbe@79:   handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
jbe@79:   handle->fd = fd;
jbe@80:   handle->writecnt = 0;
jbe@79:   luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79:   lua_setmetatable(L, -2);
jbe@79:   lua_newtable(L);  // uservalue
jbe@80:   if (gc_idx) lua_pushvalue(L, gc_idx);
jbe@80:   else lua_pushcfunction(L, moonbr_io_close);
jbe@80:   lua_setfield(L, -2, "gc");
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@80:   {"close", moonbr_io_close},
jbe@80:   {"write", moonbr_io_write},
jbe@80:   {"flush", moonbr_io_flush},
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: