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Band-aid solution to SF bug #470634: readlines() on linux requires 2 ^D's.

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The problem is that if fread() returns a short count, we attempt
another fread() the next time through the loop, and apparently glibc
clears or ignores the eof condition so the second fread() requires
another ^D to make it see the eof condition.

According to the man page (and the C std, I hope) fread() can only
return a short count on error or eof.  I'm using that in the band-aid
solution to avoid calling fread() a second time after a short read.

Note that xreadlines() still has this problem: it calls
readlines(sizehint) until it gets a zero-length return.  Since
xreadlines() is mostly used for reading real files, I won't worry
about this until we get a bug report.
This commit is contained in:
Guido van Rossum 2001-10-12 20:01:53 +00:00
parent c65b3d95b6
commit 79fd0fcae4
1 changed files with 11 additions and 4 deletions
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15
Objects/fileobject.c
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@ -1045,6 +1045,7 @@ file_readlines(PyFileObject *f, PyObject *args)
size_t totalread = 0;
char *p, *q, *end;
int err;
int shortread = 0;
if (f->f_fp == NULL)
return err_closed();
@ -1053,10 +1054,16 @@ file_readlines(PyFileObject *f, PyObject *args)
if ((list = PyList_New(0)) == NULL)
return NULL;
for (;;) {
Py_BEGIN_ALLOW_THREADS
errno = 0;
nread = fread(buffer+nfilled, 1, buffersize-nfilled, f->f_fp);
Py_END_ALLOW_THREADS
if (shortread)
nread = 0;
else {
Py_BEGIN_ALLOW_THREADS
errno = 0;
nread = fread(buffer+nfilled, 1,
buffersize-nfilled, f->f_fp);
Py_END_ALLOW_THREADS
shortread = (nread < buffersize-nfilled);
}
if (nread == 0) {
sizehint = 0;
if (!ferror(f->f_fp))