diff options
Diffstat (limited to 'src/term.c')
| -rw-r--r-- | src/term.c | 822 |
1 files changed, 817 insertions, 5 deletions
@@ -1,37 +1,849 @@ /// @submodule system + +// Unix: see https://blog.nelhage.com/2009/12/a-brief-introduction-to-termios-termios3-and-stty/ +// Windows: see https://learn.microsoft.com/en-us/windows/console/console-reference + #include <lua.h> #include <lauxlib.h> #include <lualib.h> #include "compat.h" +#include "bitflags.h" #ifndef _MSC_VER # include <unistd.h> #endif +#ifdef _WIN32 +# include <windows.h> +#else +# include <termios.h> +# include <string.h> +# include <errno.h> +# include <fcntl.h> +# include <sys/ioctl.h> +# include <unistd.h> +#endif + +#ifdef _WIN32 +// after an error is returned, GetLastError() result can be passed to this function to get a string +// representation of the error on the stack. +// result will be nil+error on the stack, always 2 results. +static void termFormatError(lua_State *L, DWORD errorCode, const char* prefix) { +//static void FormatErrorAndReturn(lua_State *L, DWORD errorCode, const char* prefix) { + LPSTR messageBuffer = NULL; + FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, + NULL, errorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL); + + lua_pushnil(L); + if (messageBuffer) { + if (prefix) { + lua_pushfstring(L, "%s: %s", prefix, messageBuffer); + } else { + lua_pushstring(L, messageBuffer); + } + LocalFree(messageBuffer); + } else { + lua_pushfstring(L, "%sError code %d", prefix ? prefix : "", errorCode); + } +} +#else +static int pusherror(lua_State *L, const char *info) +{ + lua_pushnil(L); + if (info==NULL) + lua_pushstring(L, strerror(errno)); + else + lua_pushfstring(L, "%s: %s", info, strerror(errno)); + lua_pushinteger(L, errno); + return 3; +} +#endif /*** Checks if a file-handle is a TTY. @function isatty -@tparam file file the file-handle to check +@tparam file file the file-handle to check, one of `io.stdin`, `io.stdout`, `io.stderr`. @treturn boolean true if the file is a tty +@usage +local system = require('system') +if system.isatty(io.stdin) then + -- enable ANSI coloring etc on Windows, does nothing in Posix. + local flags = system.getconsoleflags(io.stdout) + system.setconsoleflags(io.stdout, flags + sys.COF_VIRTUAL_TERMINAL_PROCESSING) +end */ -static int lua_isatty(lua_State* L) { +static int lst_isatty(lua_State* L) { FILE **fh = (FILE **) luaL_checkudata(L, 1, LUA_FILEHANDLE); lua_pushboolean(L, isatty(fileno(*fh))); return 1; } +/*------------------------------------------------------------------------- + * Windows Get/SetConsoleMode functions + *-------------------------------------------------------------------------*/ -static luaL_Reg func[] = { - { "isatty", lua_isatty }, - { NULL, NULL } +typedef struct ls_RegConst { + const char *name; + DWORD value; +} ls_RegConst; + +// Define a macro to check if a constant is defined and set it to 0 if not. +// This is needed because some flags are not defined on all platforms. So we +// still export the constants, but they will be all 0, and hence not do anything. +#ifdef _WIN32 +#define CHECK_WIN_FLAG_OR_ZERO(flag) flag +#define CHECK_NIX_FLAG_OR_ZERO(flag) 0 +#else +#define CHECK_WIN_FLAG_OR_ZERO(flag) 0 +#define CHECK_NIX_FLAG_OR_ZERO(flag) flag +#endif + +// Export Windows constants to Lua +static const struct ls_RegConst win_console_in_flags[] = { + // Console Input Flags + {"CIF_ECHO_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_ECHO_INPUT)}, + {"CIF_INSERT_MODE", CHECK_WIN_FLAG_OR_ZERO(ENABLE_INSERT_MODE)}, + {"CIF_LINE_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_LINE_INPUT)}, + {"CIF_MOUSE_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_MOUSE_INPUT)}, + {"CIF_PROCESSED_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_PROCESSED_INPUT)}, + {"CIF_QUICK_EDIT_MODE", CHECK_WIN_FLAG_OR_ZERO(ENABLE_QUICK_EDIT_MODE)}, + {"CIF_WINDOW_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_WINDOW_INPUT)}, + {"CIF_VIRTUAL_TERMINAL_INPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_VIRTUAL_TERMINAL_INPUT)}, + {"CIF_EXTENDED_FLAGS", CHECK_WIN_FLAG_OR_ZERO(ENABLE_EXTENDED_FLAGS)}, + {"CIF_AUTO_POSITION", CHECK_WIN_FLAG_OR_ZERO(ENABLE_AUTO_POSITION)}, + {NULL, 0} +}; + +static const struct ls_RegConst win_console_out_flags[] = { + // Console Output Flags + {"COF_PROCESSED_OUTPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_PROCESSED_OUTPUT)}, + {"COF_WRAP_AT_EOL_OUTPUT", CHECK_WIN_FLAG_OR_ZERO(ENABLE_WRAP_AT_EOL_OUTPUT)}, + {"COF_VIRTUAL_TERMINAL_PROCESSING", CHECK_WIN_FLAG_OR_ZERO(ENABLE_VIRTUAL_TERMINAL_PROCESSING)}, + {"COF_DISABLE_NEWLINE_AUTO_RETURN", CHECK_WIN_FLAG_OR_ZERO(DISABLE_NEWLINE_AUTO_RETURN)}, + {"COF_ENABLE_LVB_GRID_WORLDWIDE", CHECK_WIN_FLAG_OR_ZERO(ENABLE_LVB_GRID_WORLDWIDE)}, + {NULL, 0} +}; + + +// Export Unix constants to Lua +static const struct ls_RegConst nix_tcsetattr_actions[] = { + // The optional actions for tcsetattr + {"TCSANOW", CHECK_NIX_FLAG_OR_ZERO(TCSANOW)}, + {"TCSADRAIN", CHECK_NIX_FLAG_OR_ZERO(TCSADRAIN)}, + {"TCSAFLUSH", CHECK_NIX_FLAG_OR_ZERO(TCSAFLUSH)}, + {NULL, 0} +}; + +static const struct ls_RegConst nix_console_i_flags[] = { + // Input flags (c_iflag) + {"I_IGNBRK", CHECK_NIX_FLAG_OR_ZERO(IGNBRK)}, + {"I_BRKINT", CHECK_NIX_FLAG_OR_ZERO(BRKINT)}, + {"I_IGNPAR", CHECK_NIX_FLAG_OR_ZERO(IGNPAR)}, + {"I_PARMRK", CHECK_NIX_FLAG_OR_ZERO(PARMRK)}, + {"I_INPCK", CHECK_NIX_FLAG_OR_ZERO(INPCK)}, + {"I_ISTRIP", CHECK_NIX_FLAG_OR_ZERO(ISTRIP)}, + {"I_INLCR", CHECK_NIX_FLAG_OR_ZERO(INLCR)}, + {"I_IGNCR", CHECK_NIX_FLAG_OR_ZERO(IGNCR)}, + {"I_ICRNL", CHECK_NIX_FLAG_OR_ZERO(ICRNL)}, +#ifndef __APPLE__ + {"I_IUCLC", CHECK_NIX_FLAG_OR_ZERO(IUCLC)}, // Might not be available on all systems +#else + {"I_IUCLC", 0}, +#endif + {"I_IXON", CHECK_NIX_FLAG_OR_ZERO(IXON)}, + {"I_IXANY", CHECK_NIX_FLAG_OR_ZERO(IXANY)}, + {"I_IXOFF", CHECK_NIX_FLAG_OR_ZERO(IXOFF)}, + {"I_IMAXBEL", CHECK_NIX_FLAG_OR_ZERO(IMAXBEL)}, + {NULL, 0} }; +static const struct ls_RegConst nix_console_o_flags[] = { + // Output flags (c_oflag) + {"O_OPOST", CHECK_NIX_FLAG_OR_ZERO(OPOST)}, +#ifndef __APPLE__ + {"O_OLCUC", CHECK_NIX_FLAG_OR_ZERO(OLCUC)}, // Might not be available on all systems +#else + {"O_OLCUC", 0}, +#endif + {"O_ONLCR", CHECK_NIX_FLAG_OR_ZERO(ONLCR)}, + {"O_OCRNL", CHECK_NIX_FLAG_OR_ZERO(OCRNL)}, + {"O_ONOCR", CHECK_NIX_FLAG_OR_ZERO(ONOCR)}, + {"O_ONLRET", CHECK_NIX_FLAG_OR_ZERO(ONLRET)}, + {"O_OFILL", CHECK_NIX_FLAG_OR_ZERO(OFILL)}, + {"O_OFDEL", CHECK_NIX_FLAG_OR_ZERO(OFDEL)}, + {"O_NLDLY", CHECK_NIX_FLAG_OR_ZERO(NLDLY)}, + {"O_CRDLY", CHECK_NIX_FLAG_OR_ZERO(CRDLY)}, + {"O_TABDLY", CHECK_NIX_FLAG_OR_ZERO(TABDLY)}, + {"O_BSDLY", CHECK_NIX_FLAG_OR_ZERO(BSDLY)}, + {"O_VTDLY", CHECK_NIX_FLAG_OR_ZERO(VTDLY)}, + {"O_FFDLY", CHECK_NIX_FLAG_OR_ZERO(FFDLY)}, + {NULL, 0} +}; + +static const struct ls_RegConst nix_console_l_flags[] = { + // Local flags (c_lflag) + {"L_ISIG", CHECK_NIX_FLAG_OR_ZERO(ISIG)}, + {"L_ICANON", CHECK_NIX_FLAG_OR_ZERO(ICANON)}, +#ifndef __APPLE__ + {"L_XCASE", CHECK_NIX_FLAG_OR_ZERO(XCASE)}, // Might not be available on all systems +#else + {"L_XCASE", 0}, +#endif + {"L_ECHO", CHECK_NIX_FLAG_OR_ZERO(ECHO)}, + {"L_ECHOE", CHECK_NIX_FLAG_OR_ZERO(ECHOE)}, + {"L_ECHOK", CHECK_NIX_FLAG_OR_ZERO(ECHOK)}, + {"L_ECHONL", CHECK_NIX_FLAG_OR_ZERO(ECHONL)}, + {"L_NOFLSH", CHECK_NIX_FLAG_OR_ZERO(NOFLSH)}, + {"L_TOSTOP", CHECK_NIX_FLAG_OR_ZERO(TOSTOP)}, + {"L_ECHOCTL", CHECK_NIX_FLAG_OR_ZERO(ECHOCTL)}, // Might not be available on all systems + {"L_ECHOPRT", CHECK_NIX_FLAG_OR_ZERO(ECHOPRT)}, // Might not be available on all systems + {"L_ECHOKE", CHECK_NIX_FLAG_OR_ZERO(ECHOKE)}, // Might not be available on all systems + {"L_FLUSHO", CHECK_NIX_FLAG_OR_ZERO(FLUSHO)}, + {"L_PENDIN", CHECK_NIX_FLAG_OR_ZERO(PENDIN)}, + {"L_IEXTEN", CHECK_NIX_FLAG_OR_ZERO(IEXTEN)}, + {NULL, 0} +}; + +static DWORD win_valid_in_flags = 0; +static DWORD win_valid_out_flags = 0; +static DWORD nix_valid_i_flags = 0; +static DWORD nix_valid_o_flags = 0; +static DWORD nix_valid_l_flags = 0; +static void initialize_valid_flags() +{ + win_valid_in_flags = 0; + for (int i = 0; win_console_in_flags[i].name != NULL; i++) + { + win_valid_in_flags |= win_console_in_flags[i].value; + } + win_valid_out_flags = 0; + for (int i = 0; win_console_out_flags[i].name != NULL; i++) + { + win_valid_out_flags |= win_console_out_flags[i].value; + } + nix_valid_i_flags = 0; + for (int i = 0; nix_console_i_flags[i].name != NULL; i++) + { + nix_valid_i_flags |= nix_console_i_flags[i].value; + } + nix_valid_o_flags = 0; + for (int i = 0; nix_console_o_flags[i].name != NULL; i++) + { + nix_valid_o_flags |= nix_console_o_flags[i].value; + } + nix_valid_l_flags = 0; + for (int i = 0; nix_console_l_flags[i].name != NULL; i++) + { + nix_valid_l_flags |= nix_console_l_flags[i].value; + } +} + +#ifdef _WIN32 +// first item on the stack should be io.stdin, io.stderr, or io.stdout, second item +// should be the flags to validate. +// If it returns NULL, then it leaves nil+err on the stack +static HANDLE get_console_handle(lua_State *L, int flags_optional) +{ + if (lua_gettop(L) < 1) { + luaL_argerror(L, 1, "expected file handle"); + } + + HANDLE handle; + DWORD valid; + FILE *file = *(FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE); + if (file == stdin && file != NULL) { + handle = GetStdHandle(STD_INPUT_HANDLE); + valid = win_valid_in_flags; + + } else if (file == stdout && file != NULL) { + handle = GetStdHandle(STD_OUTPUT_HANDLE); + valid = win_valid_out_flags; + + } else if (file == stderr && file != NULL) { + handle = GetStdHandle(STD_ERROR_HANDLE); + valid = win_valid_out_flags; + + } else { + luaL_argerror(L, 1, "invalid file handle"); // does not return + } + + if (handle == INVALID_HANDLE_VALUE) { + termFormatError(L, GetLastError(), "failed to retrieve std handle"); + lua_error(L); // does not return + } + + if (handle == NULL) { + lua_pushnil(L); + lua_pushliteral(L, "failed to get console handle"); + return NULL; + } + + if (flags_optional && lua_gettop(L) < 2) { + return handle; + } + + if (lua_gettop(L) < 2) { + luaL_argerror(L, 2, "expected flags"); + } + + LSBF_BITFLAG flags = lsbf_checkbitflags(L, 2); + if ((flags & ~valid) != 0) { + luaL_argerror(L, 2, "invalid flags"); + } + + return handle; +} +#else +// first item on the stack should be io.stdin, io.stderr, or io.stdout. Throws a +// Lua error if the file is not one of these. +static int get_console_handle(lua_State *L) +{ + FILE **file = (FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE); + if (file == NULL || *file == NULL) { + return luaL_argerror(L, 1, "expected file handle"); // call doesn't return + } + + // Check if the file is stdin, stdout, or stderr + if (*file == stdin || *file == stdout || *file == stderr) { + // Push the file descriptor onto the Lua stack + return fileno(*file); + } + + return luaL_argerror(L, 1, "invalid file handle"); // does not return +} +#endif + + + +/*** +Sets the console flags (Windows). +The `CIF_` and `COF_` constants are available on the module table. Where `CIF` are the +input flags (for use with `io.stdin`) and `COF` are the output flags (for use with +`io.stdout`/`io.stderr`). + +To see flag status and constant names check `listconsoleflags`. + +Note: not all combinations of flags are allowed, as some are mutually exclusive or mutually required. +See [setconsolemode documentation](https://learn.microsoft.com/en-us/windows/console/setconsolemode) +@function setconsoleflags +@tparam file file the file-handle to set the flags on +@tparam bitflags bitflags the flags to set/unset +@treturn[1] boolean `true` on success +@treturn[2] nil +@treturn[2] string error message +@usage +local system = require('system') +system.listconsoleflags(io.stdout) -- List all the available flags and their current status + +local flags = system.getconsoleflags(io.stdout) +assert(system.setconsoleflags(io.stdout, + flags + system.COF_VIRTUAL_TERMINAL_PROCESSING) + +system.listconsoleflags(io.stdout) -- List again to check the differences +*/ +static int lst_setconsoleflags(lua_State *L) +{ +#ifdef _WIN32 + HANDLE console_handle = get_console_handle(L, 0); + if (console_handle == NULL) { + return 2; // error message is already on the stack + } + LSBF_BITFLAG new_console_mode = lsbf_checkbitflags(L, 2); + + DWORD prev_console_mode; + if (GetConsoleMode(console_handle, &prev_console_mode) == 0) + { + termFormatError(L, GetLastError(), "failed to get console mode"); + return 2; + } + + int success = SetConsoleMode(console_handle, new_console_mode) != 0; + if (!success) + { + termFormatError(L, GetLastError(), "failed to set console mode"); + return 2; + } + +#endif + lua_pushboolean(L, 1); + return 1; +} + + + +/*** +Gets console flags (Windows). +@function getconsoleflags +@tparam file file the file-handle to get the flags from. +@treturn[1] bitflags the current console flags. +@treturn[2] nil +@treturn[2] string error message +@usage +local system = require('system') + +local flags = system.getconsoleflags(io.stdout) +print("Current stdout flags:", tostring(flags)) + +if flags:has(system.COF_VIRTUAL_TERMINAL_PROCESSING + system.COF_PROCESSED_OUTPUT) then + print("Both flags are set") +else + print("At least one flag is not set") +end +*/ +static int lst_getconsoleflags(lua_State *L) +{ + DWORD console_mode = 0; + +#ifdef _WIN32 + HANDLE console_handle = get_console_handle(L, 1); + if (console_handle == NULL) { + return 2; // error message is already on the stack + } + + if (GetConsoleMode(console_handle, &console_mode) == 0) + { + lua_pushnil(L); + lua_pushliteral(L, "failed to get console mode"); + return 2; + } + +#endif + lsbf_pushbitflags(L, console_mode); + return 1; +} + + + +/*------------------------------------------------------------------------- + * Unix tcgetattr/tcsetattr functions + *-------------------------------------------------------------------------*/ +// Code modified from the LuaPosix library by Gary V. Vaughan +// see https://github.com/luaposix/luaposix + +/*** +Get termios state. +The terminal attributes is a table with the following fields: + +- `iflag` input flags +- `oflag` output flags +- `cflag` control flags +- `lflag` local flags +- `ispeed` input speed +- `ospeed` output speed +- `cc` control characters + +@function tcgetattr +@tparam file fd file handle to operate on, one of `io.stdin`, `io.stdout`, `io.stderr` +@treturn[1] termios terminal attributes, if successful. On Windows the bitflags are all 0, and the `cc` table is empty. +@treturn[2] nil +@treturn[2] string error message +@treturn[2] int errnum +@return error message if failed +@usage +local system = require('system') + +local status = assert(tcgetattr(io.stdin)) +if status.iflag:has(system.I_IGNBRK) then + print("Ignoring break condition") +end +*/ +static int lst_tcgetattr(lua_State *L) +{ +#ifndef _WIN32 + int r, i; + struct termios t; + int fd = get_console_handle(L); + + r = tcgetattr(fd, &t); + if (r == -1) return pusherror(L, NULL); + + lua_newtable(L); + lsbf_pushbitflags(L, t.c_iflag); + lua_setfield(L, -2, "iflag"); + + lsbf_pushbitflags(L, t.c_oflag); + lua_setfield(L, -2, "oflag"); + + lsbf_pushbitflags(L, t.c_lflag); + lua_setfield(L, -2, "lflag"); + + lsbf_pushbitflags(L, t.c_cflag); + lua_setfield(L, -2, "cflag"); + + lua_pushinteger(L, cfgetispeed(&t)); + lua_setfield(L, -2, "ispeed"); + + lua_pushinteger(L, cfgetospeed(&t)); + lua_setfield(L, -2, "ospeed"); + + lua_newtable(L); + for (i=0; i<NCCS; i++) + { + lua_pushinteger(L, i); + lua_pushinteger(L, t.c_cc[i]); + lua_settable(L, -3); + } + lua_setfield(L, -2, "cc"); + +#else + lua_newtable(L); + lsbf_pushbitflags(L, 0); + lua_setfield(L, -2, "iflag"); + lsbf_pushbitflags(L, 0); + lua_setfield(L, -2, "oflag"); + lsbf_pushbitflags(L, 0); + lua_setfield(L, -2, "lflag"); + lsbf_pushbitflags(L, 0); + lua_setfield(L, -2, "cflag"); + lua_pushinteger(L, 0); + lua_setfield(L, -2, "ispeed"); + lua_pushinteger(L, 0); + lua_setfield(L, -2, "ospeed"); + lua_newtable(L); + lua_setfield(L, -2, "cc"); + +#endif + return 1; +} + + + +/*** +Set termios state. +This function will set the flags as given. + +The `I_`, `O_`, and `L_` constants are available on the module table. They are the respective +flags for the `iflags`, `oflags`, and `lflags` bitmasks. + +To see flag status and constant names check `listtermflags`. For their meaning check +[the manpage](https://www.man7.org/linux/man-pages/man3/termios.3.html). + +_Note_: not all combinations of flags are allowed, as some are mutually exclusive or mutually required. +See [setconsolemode documentation](https://learn.microsoft.com/en-us/windows/console/setconsolemode) + +_Note_: only `iflag`, `oflag`, and `lflag` are supported at the moment. The other fields are ignored. +@function tcsetattr +@tparam file fd file handle to operate on, one of `io.stdin`, `io.stdout`, `io.stderr` +@int actions one of `TCSANOW`, `TCSADRAIN`, `TCSAFLUSH` +@tparam table termios a table with bitflag fields: +@tparam[opt] bitflags termios.iflag if given will set the input flags +@tparam[opt] bitflags termios.oflag if given will set the output flags +@tparam[opt] bitflags termios.lflag if given will set the local flags +@treturn[1] bool `true`, if successful. Always returns `true` on Windows. +@return[2] nil +@treturn[2] string error message +@treturn[2] int errnum +@usage +local system = require('system') + +local status = assert(tcgetattr(io.stdin)) +if not status.lflag:has(system.L_ECHO) then + -- if echo is off, turn echoing newlines on + tcsetattr(io.stdin, system.TCSANOW, { lflag = status.lflag + system.L_ECHONL })) +end +*/ +static int lst_tcsetattr(lua_State *L) +{ +#ifndef _WIN32 + struct termios t; + int r, i; + int fd = get_console_handle(L); // first is the console handle + int act = luaL_checkinteger(L, 2); // second is the action to take + luaL_checktype(L, 3, LUA_TTABLE); // third is the termios table with fields + + r = tcgetattr(fd, &t); + if (r == -1) return pusherror(L, NULL); + + lua_getfield(L, 3, "iflag"); + if (!lua_isnil(L, -1)) { + t.c_iflag = lsbf_checkbitflags(L, -1); + } + lua_pop(L, 1); + + lua_getfield(L, 3, "oflag"); + if (!lua_isnil(L, -1)) { + t.c_oflag = lsbf_checkbitflags(L, -1); + } + lua_pop(L, 1); + + lua_getfield(L, 3, "lflag"); + if (!lua_isnil(L, -1)) { + t.c_lflag = lsbf_checkbitflags(L, -1); + } + lua_pop(L, 1); + + // Skipping the others for now + + // lua_getfield(L, 3, "cflag"); t.c_cflag = optint(L, -1, 0); lua_pop(L, 1); + // lua_getfield(L, 3, "ispeed"); cfsetispeed( &t, optint(L, -1, B0) ); lua_pop(L, 1); + // lua_getfield(L, 3, "ospeed"); cfsetospeed( &t, optint(L, -1, B0) ); lua_pop(L, 1); + + // lua_getfield(L, 3, "cc"); + // for (i=0; i<NCCS; i++) + // { + // lua_pushinteger(L, i); + // lua_gettable(L, -2); + // t.c_cc[i] = optint(L, -1, 0); + // lua_pop(L, 1); + // } + + r = tcsetattr(fd, act, &t); + if (r == -1) return pusherror(L, NULL); +#endif + + lua_pushboolean(L, 1); + return 1; +} + + + +/*** +Enables or disables non-blocking mode for a file (Posix). +@function setnonblock +@tparam file fd file handle to operate on, one of `io.stdin`, `io.stdout`, `io.stderr` +@tparam boolean make_non_block a truthy value will enable non-blocking mode, a falsy value will disable it. +@treturn[1] bool `true`, if successful +@treturn[2] nil +@treturn[2] string error message +@treturn[2] int errnum +@see getnonblock +@usage +local sys = require('system') + +-- set io.stdin to non-blocking mode +local old_setting = sys.getnonblock(io.stdin) +sys.setnonblock(io.stdin, true) + +-- do stuff + +-- restore old setting +sys.setnonblock(io.stdin, old_setting) +*/ +static int lst_setnonblock(lua_State *L) +{ +#ifndef _WIN32 + + int fd = get_console_handle(L); + + int flags = fcntl(fd, F_GETFL, 0); + if (flags == -1) { + return pusherror(L, "Error getting handle flags: "); + } + if (lua_toboolean(L, 2)) { + // truthy: set non-blocking + flags |= O_NONBLOCK; + } else { + // falsy: set disable non-blocking + flags &= ~O_NONBLOCK; + } + if (fcntl(fd, F_SETFL, flags) == -1) { + return pusherror(L, "Error changing O_NONBLOCK: "); + } + +#endif + + lua_pushboolean(L, 1); + return 1; +} + + + +/*** +Gets non-blocking mode status for a file (Posix). +@function getnonblock +@tparam file fd file handle to operate on, one of `io.stdin`, `io.stdout`, `io.stderr` +@treturn[1] bool `true` if set to non-blocking, `false` if not. Always returns `false` on Windows. +@treturn[2] nil +@treturn[2] string error message +@treturn[2] int errnum +*/ +static int lst_getnonblock(lua_State *L) +{ +#ifndef _WIN32 + + int fd = get_console_handle(L); + + // Set O_NONBLOCK + int flags = fcntl(fd, F_GETFL, 0); + if (flags == -1) { + return pusherror(L, "Error getting handle flags: "); + } + if (flags & O_NONBLOCK) { + lua_pushboolean(L, 1); + } else { + lua_pushboolean(L, 0); + } + +#else + lua_pushboolean(L, 0); + +#endif + return 1; +} + + + +/*------------------------------------------------------------------------- + * Reading keyboard input + *-------------------------------------------------------------------------*/ + +/*** +Reads a key from the console non-blocking. +On Posix, `io.stdin` must be set to non-blocking mode using `setnonblock` +before calling this function. Otherwise it will block. + +@function readkey +@treturn[1] integer the key code of the key that was pressed +@treturn[2] nil if no key was pressed +*/ +static int lst_readkey(lua_State *L) { +#ifdef _WIN32 + if (_kbhit()) { + lua_pushinteger(L, _getch()); + return 1; + } + return 0; + +#else + char ch; + if (read(STDIN_FILENO, &ch, 1) > 0) { + lua_pushinteger(L, ch); + return 1; + } + return 0; + +#endif +} + +/*** +Checks if a key has been pressed without reading it. +On Posix, `io.stdin` must be set to non-blocking mode using `setnonblock` +before calling this function. Otherwise it will block. + +@function keypressed +@treturn boolean true if a key has been pressed, nil if not. +*/ +static int lst_keypressed(lua_State *L) { +#ifdef _WIN32 + if (kbhit()) { + lua_pushboolean(L, 1); + return 1; + } + return 0; + +#else + char ch; + if (read(STDIN_FILENO, &ch, 1) > 0) { + // key was read, push back to stdin + ungetc(ch, stdin); + lua_pushboolean(L, 1); + return 1; + } + return 0; + +#endif +} + +/*------------------------------------------------------------------------- + * Retrieve terminal size + *-------------------------------------------------------------------------*/ + + +/*** +Get the size of the terminal in columns and rows. +@function termsize +@treturn[1] int the number of columns +@treturn[1] int the number of rows +@treturn[2] nil +@treturn[2] string error message +*/ +static int lst_termsize(lua_State *L) { + int columns, rows; + +#ifdef _WIN32 + CONSOLE_SCREEN_BUFFER_INFO csbi; + if (!GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi)) { + termFormatError(L, GetLastError(), "Failed to get terminal size."); + return 2; + } + columns = csbi.srWindow.Right - csbi.srWindow.Left + 1; + rows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1; + +#else + struct winsize ws; + if (ioctl(1, TIOCGWINSZ, &ws) == -1) { + return pusherror(L, "Failed to get terminal size."); + } + columns = ws.ws_col; + rows = ws.ws_row; + +#endif + lua_pushinteger(L, columns); + lua_pushinteger(L, rows); + return 2; +} + + + /*------------------------------------------------------------------------- * Initializes module *-------------------------------------------------------------------------*/ + +static luaL_Reg func[] = { + { "isatty", lst_isatty }, + { "getconsoleflags", lst_getconsoleflags }, + { "setconsoleflags", lst_setconsoleflags }, + { "tcgetattr", lst_tcgetattr }, + { "tcsetattr", lst_tcsetattr }, + { "getnonblock", lst_setnonblock }, + { "setnonblock", lst_setnonblock }, + { "readkey", lst_readkey }, + { "keypressed", lst_keypressed }, + { "termsize", lst_termsize }, + { NULL, NULL } +}; + + + void term_open(lua_State *L) { + // set up constants and export the constants in module table + initialize_valid_flags(); + // Windows flags + for (int i = 0; win_console_in_flags[i].name != NULL; i++) + { + lsbf_pushbitflags(L, win_console_in_flags[i].value); + lua_setfield(L, -2, win_console_in_flags[i].name); + } + for (int i = 0; win_console_out_flags[i].name != NULL; i++) + { + lsbf_pushbitflags(L, win_console_out_flags[i].value); + lua_setfield(L, -2, win_console_out_flags[i].name); + } + // Unix flags + for (int i = 0; nix_console_i_flags[i].name != NULL; i++) + { + lsbf_pushbitflags(L, nix_console_i_flags[i].value); + lua_setfield(L, -2, nix_console_i_flags[i].name); + } + for (int i = 0; nix_console_o_flags[i].name != NULL; i++) + { + lsbf_pushbitflags(L, nix_console_o_flags[i].value); + lua_setfield(L, -2, nix_console_o_flags[i].name); + } + for (int i = 0; nix_console_l_flags[i].name != NULL; i++) + { + lsbf_pushbitflags(L, nix_console_l_flags[i].value); + lua_setfield(L, -2, nix_console_l_flags[i].name); + } + // Unix tcsetattr actions + for (int i = 0; nix_tcsetattr_actions[i].name != NULL; i++) + { + lua_pushinteger(L, nix_tcsetattr_actions[i].value); + lua_setfield(L, -2, nix_tcsetattr_actions[i].name); + } + + // export functions luaL_setfuncs(L, func, 0); } |