#1006: r.terraflow fails to stat() stream file on Windows
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Reporter: marisn | Owner: grass-dev@lists.osgeo.org
Type: defect | Status: new
Priority: critical | Milestone: 6.4.0
Component: Raster | Version: svn-releasebranch64
Resolution: | Keywords: wxgui, wingrass, terraflow
Platform: MSWindows Vista | Cpu: x86-32
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Comment (by glynn):
Replying to [comment:14 hamish]:
> is stat() on Windows the same as it is on UNIX?
Sort of. '''However''': if the file is open, it reports the size as zero
bytes (or possibly the original size if the file was opened for update
without truncation). Once the file is closed, it reports the correct size.
Also, fstat() works correctly on open files.
Test case:
{{{
$ cat test.c
#include <stdio.h>
#include <sys/stat.h>
int main(void)
{
char buf[1024];
struct stat st;
FILE *fp;
int i;
fp = fopen("test.dat", "wb");
for (i = 0; i < 64; i++)
fwrite(buf, 1, sizeof(buf), fp);
fflush(fp);
stat("test.dat", &st);
printf("%d\n", (int)st.st_size);
fstat(fileno(fp), &st);
printf("%d\n", (int)st.st_size);
fclose(fp);
stat("test.dat", &st);
printf("%d\n", (int)st.st_size);
return 0;
}
$ gcc -Wall test.c
$ ./a.exe
0
65536
65536
}}}
A more portable way to determine the length of a file is to use
fseek(SEEK_END), e.g.:
{{{
long save = ftell(fp);
fseek(fp, 0, SEEK_END);
long size = ftell(fp);
fseek(fp, save, SEEK_SET);
return size;
}}}
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/1006#comment:22>
GRASS GIS <http://grass.osgeo.org>
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