| paul@529 | 1 | #!/usr/bin/env python |
| paul@529 | 2 | |
| paul@529 | 3 | """ |
| paul@529 | 4 | C library input/output. |
| paul@529 | 5 | |
| paul@529 | 6 | Copyright (C) 2016, 2017 Paul Boddie <paul@boddie.org.uk> |
| paul@529 | 7 | |
| paul@529 | 8 | This program is free software; you can redistribute it and/or modify it under |
| paul@529 | 9 | the terms of the GNU General Public License as published by the Free Software |
| paul@529 | 10 | Foundation; either version 3 of the License, or (at your option) any later |
| paul@529 | 11 | version. |
| paul@529 | 12 | |
| paul@529 | 13 | This program is distributed in the hope that it will be useful, but WITHOUT |
| paul@529 | 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| paul@529 | 15 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| paul@529 | 16 | details. |
| paul@529 | 17 | |
| paul@529 | 18 | You should have received a copy of the GNU General Public License along with |
| paul@529 | 19 | this program. If not, see <http://www.gnu.org/licenses/>. |
| paul@529 | 20 | """ |
| paul@529 | 21 | |
| paul@529 | 22 | from __builtins__.stream import filestream |
| paul@529 | 23 | from __builtins__.types import check_int, check_string |
| paul@529 | 24 | |
| paul@529 | 25 | import locale |
| paul@529 | 26 | |
| paul@529 | 27 | from native import ( |
| paul@529 | 28 | close as _close, |
| paul@529 | 29 | fdopen as _fdopen, |
| paul@529 | 30 | read as _read, |
| paul@529 | 31 | write as _write |
| paul@529 | 32 | ) |
| paul@529 | 33 | |
| paul@529 | 34 | # Abstractions for system-level files and streams. |
| paul@529 | 35 | |
| paul@529 | 36 | class sysfile: |
| paul@529 | 37 | |
| paul@529 | 38 | "A system-level file object." |
| paul@529 | 39 | |
| paul@529 | 40 | def __init__(self, fd): |
| paul@529 | 41 | |
| paul@529 | 42 | "Initialise the file with the given 'fd'." |
| paul@529 | 43 | |
| paul@529 | 44 | self.fd = fd |
| paul@529 | 45 | |
| paul@529 | 46 | def read(self, n): |
| paul@529 | 47 | |
| paul@529 | 48 | "Read 'n' bytes from the file, returning a string." |
| paul@529 | 49 | |
| paul@529 | 50 | return read(self.fd, n) |
| paul@529 | 51 | |
| paul@529 | 52 | def write(self, s): |
| paul@529 | 53 | |
| paul@529 | 54 | "Write string 's' to the file." |
| paul@529 | 55 | |
| paul@529 | 56 | return write(self.fd, s) |
| paul@529 | 57 | |
| paul@529 | 58 | def close(self): |
| paul@529 | 59 | |
| paul@529 | 60 | "Close the file." |
| paul@529 | 61 | |
| paul@529 | 62 | close(self.fd) |
| paul@529 | 63 | |
| paul@529 | 64 | class sysstream(filestream): |
| paul@529 | 65 | |
| paul@529 | 66 | "A system-level stream object." |
| paul@529 | 67 | |
| paul@529 | 68 | def __init__(self, fd, mode="r", encoding=None, bufsize=1024): |
| paul@529 | 69 | |
| paul@529 | 70 | """ |
| paul@529 | 71 | Initialise the stream with the given 'fd', 'mode', 'encoding' and |
| paul@529 | 72 | 'bufsize'. |
| paul@529 | 73 | """ |
| paul@529 | 74 | |
| paul@529 | 75 | check_int(fd) |
| paul@529 | 76 | check_string(mode) |
| paul@529 | 77 | |
| paul@529 | 78 | get_using(filestream.__init__, self)(encoding, bufsize) |
| paul@529 | 79 | self.__data__ = _fdopen(fd, mode) |
| paul@529 | 80 | |
| paul@529 | 81 | # Standard streams. |
| paul@529 | 82 | |
| paul@529 | 83 | stdin = sysstream(0) |
| paul@529 | 84 | stdout = sysstream(1, "w") |
| paul@529 | 85 | stderr = sysstream(2, "w") |
| paul@529 | 86 | |
| paul@529 | 87 | # Localised streams. |
| paul@529 | 88 | # Perform locale initialisation explicitly to ensure that the locale module |
| paul@529 | 89 | # and various function defaults have been initialised. |
| paul@529 | 90 | |
| paul@529 | 91 | locale.initlocale() |
| paul@529 | 92 | lstdin = sysstream(0, "r", locale.getpreferredencoding()) |
| paul@529 | 93 | |
| paul@529 | 94 | # Input/output functions. |
| paul@529 | 95 | |
| paul@529 | 96 | def close(fd): |
| paul@529 | 97 | |
| paul@529 | 98 | "Close the file descriptor 'fd'." |
| paul@529 | 99 | |
| paul@529 | 100 | _close(fd) |
| paul@529 | 101 | |
| paul@529 | 102 | def fdopen(fd, mode="r"): |
| paul@529 | 103 | |
| paul@529 | 104 | """ |
| paul@529 | 105 | Open a stream for the given file descriptor 'fd', operating in the given |
| paul@529 | 106 | 'mode'. |
| paul@529 | 107 | """ |
| paul@529 | 108 | |
| paul@529 | 109 | return sysstream(fd, mode) |
| paul@529 | 110 | |
| paul@529 | 111 | def read(fd, n): |
| paul@529 | 112 | |
| paul@529 | 113 | """ |
| paul@529 | 114 | Read using the low-level file descriptor 'fd' the given number of bytes 'n'. |
| paul@529 | 115 | """ |
| paul@529 | 116 | |
| paul@529 | 117 | check_int(fd) |
| paul@529 | 118 | check_int(n) |
| paul@529 | 119 | return _read(fd, n) |
| paul@529 | 120 | |
| paul@529 | 121 | def write(fd, s): |
| paul@529 | 122 | |
| paul@529 | 123 | "Write using the low-level file descriptor 'fd' the given string 's'." |
| paul@529 | 124 | |
| paul@529 | 125 | check_int(fd) |
| paul@529 | 126 | check_string(s) |
| paul@529 | 127 | return _write(fd, s) |
| paul@529 | 128 | |
| paul@529 | 129 | # vim: tabstop=4 expandtab shiftwidth=4 |
