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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-04-26 17:40:25 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2016-04-26 17:40:25 -0300
commitf9123b5003e62b6e54996076e860f23aee9a0593 (patch)
treec32d506730558f13d1c93c3296c698a6a61cd7a0 /libio
parent085bbece2c6afc5f13698b52fac0299445c4317f (diff)
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libio: Update internal fmemopen position after write (BZ #20005)
Current GLIBC fmemopen fails with a simple testcase: char buffer[500] = "x"; FILE *stream; stream = fmemopen(buffer, 500, "r+"); fwrite("fish",sizeof(char),5,stream); printf("pos-1:%ld\n",ftell(stream)); fflush(stream); printf("pos-2:%ld\n",ftell(stream)); It returns: pos-1:5 pos-2:0 Where it should return: pos-1:5 pos-2:5 This is due the internal write function does not correctly update the internal object position state and then the seek operation returns a wrong value. This patch fixes it. It fixes both BZ #20005 and BZ #19230 (marked as duplicated). A new test is added to check for such case. Tested on x86_64 and i686. * libio/fmemopen.c (fmemopen_write): Update internal position after write. * stdio-common/Makefile (tests): Add tst-fmemopen4.c. * stdio-common/tst-fmemopen4.c: New file..
Diffstat (limited to 'libio')
-rw-r--r--libio/fmemopen.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/libio/fmemopen.c b/libio/fmemopen.c
index 23b5c5f..9264b72 100644
--- a/libio/fmemopen.c
+++ b/libio/fmemopen.c
@@ -86,10 +86,10 @@ fmemopen_write (void *cookie, const char *b, size_t s)
memcpy (&(c->buffer[pos]), b, s);
- pos += s;
- if ((size_t) pos > c->maxpos)
+ c->pos += s;
+ if ((size_t) c->pos > c->maxpos)
{
- c->maxpos = pos;
+ c->maxpos = c->pos;
if (addnullc)
c->buffer[c->maxpos] = '\0';
}