Author: Maciej Fijalkowski <[email protected]>
Branch: fileops2
Changeset: r67182:d55b0202cef0
Date: 2013-10-07 17:16 +0200
http://bitbucket.org/pypy/pypy/changeset/d55b0202cef0/
Log: ftruncate
diff --git a/rpython/rlib/rfile.py b/rpython/rlib/rfile.py
--- a/rpython/rlib/rfile.py
+++ b/rpython/rlib/rfile.py
@@ -6,18 +6,27 @@
import os
from rpython.rtyper.lltypesystem import rffi, lltype
+from rpython.rtyper.tool import rffi_platform as platform
from rpython.translator.tool.cbuild import ExternalCompilationInfo
from rpython.rlib.rarithmetic import r_uint, intmask
from rpython.rlib import rposix
from rpython.rlib.rstring import StringBuilder
-eci = ExternalCompilationInfo(includes=['stdio.h'])
+eci = ExternalCompilationInfo(includes=['stdio.h', 'unistd.h', 'sys/types.h'])
def llexternal(*args):
return rffi.llexternal(*args, compilation_info=eci)
FILE = lltype.Struct('FILE') # opaque type maybe
+class CConfig(object):
+ _compilation_info_ = eci
+
+ off_t = platform.SimpleType('off_t')
+
+CC = platform.configure(CConfig)
+OFF_T = CC['off_t']
+
c_open = llexternal('fopen', [rffi.CCHARP, rffi.CCHARP], lltype.Ptr(FILE))
c_close = llexternal('fclose', [lltype.Ptr(FILE)], rffi.INT)
c_write = llexternal('fwrite', [rffi.CCHARP, rffi.SIZE_T, rffi.SIZE_T,
@@ -32,7 +41,8 @@
c_tmpfile = llexternal('tmpfile', [], lltype.Ptr(FILE))
c_fileno = llexternal('fileno', [lltype.Ptr(FILE)], rffi.INT)
c_ftell = llexternal('ftell', [lltype.Ptr(FILE)], lltype.Signed)
-c_fflush = llexternal('fflush', [lltype.Ptr(FILE)], lltype.Signed)
+c_fflush = llexternal('fflush', [lltype.Ptr(FILE)], rffi.INT)
+c_ftruncate = llexternal('ftruncate', [rffi.INT, OFF_T], rffi.INT)
BASE_BUF_SIZE = 4096
@@ -166,6 +176,17 @@
return
raise ValueError("I/O operation on closed file")
+ def truncate(self, arg=-1):
+ if self.ll_file:
+ if arg == -1:
+ arg = self.tell()
+ res = c_ftruncate(self.fileno(), arg)
+ if res == -1:
+ errno = rposix.get_errno()
+ raise OSError(errno, os.strerror(errno))
+ return
+ raise ValueError("I/O operation on closed file")
+
def __del__(self):
self.close()
diff --git a/rpython/rlib/test/test_rfile.py b/rpython/rlib/test/test_rfile.py
--- a/rpython/rlib/test/test_rfile.py
+++ b/rpython/rlib/test/test_rfile.py
@@ -107,7 +107,7 @@
assert res == 3
def test_flush(self):
- fname = str(self.tmpdir.join('file_trunc'))
+ fname = str(self.tmpdir.join('file_flush'))
def f():
f = open(fname, "w")
@@ -119,3 +119,19 @@
f.close()
self.interpret(f, [])
+
+ def test_truncate(self):
+ fname = str(self.tmpdir.join('file_trunc'))
+
+ def f():
+ f = open(fname, "w")
+ f.write("xyz")
+ f.seek(0)
+ f.truncate(2)
+ f.close()
+ f2 = open(fname)
+ assert f2.read() == "xy"
+ f2.close()
+
+ f()
+ self.interpret(f, [])
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