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authorUlrich Drepper <drepper@redhat.com>2006-08-14 22:16:14 +0000
committerUlrich Drepper <drepper@redhat.com>2006-08-14 22:16:14 +0000
commit107b8a922a9f72bae8d066549c675062bee0897f (patch)
treefd03a2fabf180e1abd1cfaef284447bdf63cad6f /libio/bug-memstream1.c
parent899937348376faa9092f123ffe7f000df0604b36 (diff)
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[BZ #1996]
2006-08-14 Ulrich Drepper <drepper@redhat.com> [BZ #1996] * libio/memstream.c (open_memstream): Allocate initial buffer with calloc. * libio/wmemstream.c (open_wmemstream): Likewise. * libio/strops.c: Pretty printing. (_IO_str_overflow): Clear uninitialized part of the new buffer. (enlarge_userbuf): New function. (_IO_str_seekoff): Call it if seek position is larger than current buffer. * libio/wstrops.c: Likewise. * libio/vasprintf.c: Add comment as to why we do not have to use calloc instead of malloc to allocate initial buffer. * libio/Makefile (tests): Add bug-memstream1 and bug-wmemstream1. * libio/bug-memstream1.c: New file. * libio/bug-wmemstream1.c: New file.
Diffstat (limited to 'libio/bug-memstream1.c')
-rw-r--r--libio/bug-memstream1.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/libio/bug-memstream1.c b/libio/bug-memstream1.c
new file mode 100644
index 0000000..8af36fe
--- /dev/null
+++ b/libio/bug-memstream1.c
@@ -0,0 +1,133 @@
+#include <stdio.h>
+#include <string.h>
+
+
+static int
+do_test (void)
+{
+ size_t size;
+ char *buf;
+ FILE *fp = open_memstream (&buf, &size);
+ if (fp == NULL)
+ {
+ puts ("open_memstream failed");
+ return 1;
+ }
+
+ off64_t off = ftello64 (fp);
+ if (off != 0)
+ {
+ puts ("initial position wrong");
+ return 1;
+ }
+
+ if (fseek (fp, 32768, SEEK_SET) != 0)
+ {
+ puts ("fseek failed");
+ return 1;
+ }
+
+ if (fputs ("foo", fp) == EOF)
+ {
+ puts ("fputs failed");
+ return 1;
+ }
+
+ if (fclose (fp) == EOF)
+ {
+ puts ("fclose failed");
+ return 1;
+ }
+
+ if (size != 32768 + 3)
+ {
+ printf ("expected size %d, got %zu\n", 32768 + 3, size);
+ return 1;
+ }
+
+ for (int i = 0; i < 32768; ++i)
+ if (buf[i] != '\0')
+ {
+ printf ("byte at offset %d is %#hhx\n", i, buf[i]);
+ return 1;
+ }
+
+ if (memcmp (buf + 32768, "foo", 3) != 0)
+ {
+ puts ("written string incorrect");
+ return 1;
+ }
+
+ /* Mark the buffer. */
+ memset (buf, 'A', size);
+ free (buf);
+
+ /* Try again, this time with write mode enabled before the seek. */
+ fp = open_memstream (&buf, &size);
+ if (fp == NULL)
+ {
+ puts ("2nd open_memstream failed");
+ return 1;
+ }
+
+ off = ftello64 (fp);
+ if (off != 0)
+ {
+ puts ("2nd initial position wrong");
+ return 1;
+ }
+
+ if (fputs ("bar", fp) == EOF)
+ {
+ puts ("2nd fputs failed");
+ return 1;
+ }
+
+ if (fseek (fp, 32768, SEEK_SET) != 0)
+ {
+ puts ("2nd fseek failed");
+ return 1;
+ }
+
+ if (fputs ("foo", fp) == EOF)
+ {
+ puts ("3rd fputs failed");
+ return 1;
+ }
+
+ if (fclose (fp) == EOF)
+ {
+ puts ("2nd fclose failed");
+ return 1;
+ }
+
+ if (size != 32768 + 3)
+ {
+ printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
+ return 1;
+ }
+
+ if (memcmp (buf, "bar", 3) != 0)
+ {
+ puts ("initial string incorrect in 2nd try");
+ return 1;
+ }
+
+ for (int i = 3; i < 32768; ++i)
+ if (buf[i] != '\0')
+ {
+ printf ("byte at offset %d is %#hhx in 2nd try\n", i, buf[i]);
+ return 1;
+ }
+
+ if (memcmp (buf + 32768, "foo", 3) != 0)
+ {
+ puts ("written string incorrect in 2nd try");
+ return 1;
+ }
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"