On 2010-04-01 11:06 AM, Brebner, Gavin wrote:
We hit a problem in a code, and narrowed it down to a test case that does :
while (cnt) {
f=fopen(host_file, "a+");
if (!f)
perror("dup_host_file: Could not open hostfile");
/* rewind(f); */
while (cnt) {
int ret=fscanf(f, "%s", line);
if (ret != EOF) {
fprintf(f, "%s\n", line);
cnt--;
dup++;
}
}
fclose(f);
In earlier versions of cygwin we have, this works fine, however in the recently
installed
versions, it no longer works. It seems that fopen(host_file, "a+") is NOT
positioning the
read position at the start of the file as it should. Adding an explicit
rewind(f) is a
work around.
Well if that worked previously it was a bug.
From the manual for fopen:
``a+'' Open for reading and writing. The file is created if it does
not exist. The stream is positioned at the
end of the file. Subsequent writes to the file will
always end up at the then current end of file, irre-
spective of any intervening fseek(3) or similar.
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