diff options
Diffstat (limited to 'src/library_tty.js')
| -rw-r--r-- | src/library_tty.js | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/library_tty.js b/src/library_tty.js new file mode 100644 index 00000000..bf4a2472 --- /dev/null +++ b/src/library_tty.js @@ -0,0 +1,146 @@ +mergeInto(LibraryManager.library, { + $TTY__deps: ['$FS'], + $TTY__postset: '__ATINIT__.unshift({ func: function() { TTY.init() } });' + + '__ATEXIT__.push({ func: function() { TTY.shutdown() } });' + + 'TTY.utf8 = new Runtime.UTF8Processor();', + $TTY: { + ttys: [], + init: function () { + // https://github.com/kripken/emscripten/pull/1555 + // if (ENVIRONMENT_IS_NODE) { + // // currently, FS.init does not distinguish if process.stdin is a file or TTY + // // device, it always assumes it's a TTY device. because of this, we're forcing + // // process.stdin to UTF8 encoding to at least make stdin reading compatible + // // with text files until FS.init can be refactored. + // process['stdin']['setEncoding']('utf8'); + // } + }, + shutdown: function() { + // https://github.com/kripken/emscripten/pull/1555 + // if (ENVIRONMENT_IS_NODE) { + // // inolen: any idea as to why node -e 'process.stdin.read()' wouldn't exit immediately (with process.stdin being a tty)? + // // isaacs: because now it's reading from the stream, you've expressed interest in it, so that read() kicks off a _read() which creates a ReadReq operation + // // inolen: I thought read() in that case was a synchronous operation that just grabbed some amount of buffered data if it exists? + // // isaacs: it is. but it also triggers a _read() call, which calls readStart() on the handle + // // isaacs: do process.stdin.pause() and i'd think it'd probably close the pending call + // process['stdin']['pause'](); + // } + }, + register: function(dev, ops) { + TTY.ttys[dev] = { input: [], output: [], ops: ops }; + FS.registerDevice(dev, TTY.stream_ops); + }, + stream_ops: { + open: function(stream) { + var tty = TTY.ttys[stream.node.rdev]; + if (!tty) { + throw new FS.ErrnoError(ERRNO_CODES.ENODEV); + } + stream.tty = tty; + stream.seekable = false; + }, + close: function(stream) { + // flush any pending line data + if (stream.tty.output.length) { + stream.tty.ops.put_char(stream.tty, {{{ charCode('\n') }}}); + } + }, + read: function(stream, buffer, offset, length, pos /* ignored */) { + if (!stream.tty || !stream.tty.ops.get_char) { + throw new FS.ErrnoError(ERRNO_CODES.ENXIO); + } + var bytesRead = 0; + for (var i = 0; i < length; i++) { + var result; + try { + result = stream.tty.ops.get_char(stream.tty); + } catch (e) { + throw new FS.ErrnoError(ERRNO_CODES.EIO); + } + if (result === undefined && bytesRead === 0) { + throw new FS.ErrnoError(ERRNO_CODES.EAGAIN); + } + if (result === null || result === undefined) break; + bytesRead++; + buffer[offset+i] = result; + } + if (bytesRead) { + stream.node.timestamp = Date.now(); + } + return bytesRead; + }, + write: function(stream, buffer, offset, length, pos) { + if (!stream.tty || !stream.tty.ops.put_char) { + throw new FS.ErrnoError(ERRNO_CODES.ENXIO); + } + for (var i = 0; i < length; i++) { + try { + stream.tty.ops.put_char(stream.tty, buffer[offset+i]); + } catch (e) { + throw new FS.ErrnoError(ERRNO_CODES.EIO); + } + } + if (length) { + stream.node.timestamp = Date.now(); + } + return i; + } + }, + default_tty_ops: { + // get_char has 3 particular return values: + // a.) the next character represented as an integer + // b.) undefined to signal that no data is currently available + // c.) null to signal an EOF + get_char: function(tty) { + if (!tty.input.length) { + var result = null; + if (ENVIRONMENT_IS_NODE) { + result = process['stdin']['read'](); + if (!result) { + if (process['stdin']['_readableState'] && process['stdin']['_readableState']['ended']) { + return null; // EOF + } + return undefined; // no data available + } + } else if (typeof window != 'undefined' && + typeof window.prompt == 'function') { + // Browser. + result = window.prompt('Input: '); // returns null on cancel + if (result !== null) { + result += '\n'; + } + } else if (typeof readline == 'function') { + // Command line. + result = readline(); + if (result !== null) { + result += '\n'; + } + } + if (!result) { + return null; + } + tty.input = intArrayFromString(result, true); + } + return tty.input.shift(); + }, + put_char: function(tty, val) { + if (val === null || val === {{{ charCode('\n') }}}) { + Module['print'](tty.output.join('')); + tty.output = []; + } else { + tty.output.push(TTY.utf8.processCChar(val)); + } + } + }, + default_tty1_ops: { + put_char: function(tty, val) { + if (val === null || val === {{{ charCode('\n') }}}) { + Module['printErr'](tty.output.join('')); + tty.output = []; + } else { + tty.output.push(TTY.utf8.processCChar(val)); + } + } + } + } +});
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