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| author | Richard Levitte <levitte@openssl.org> | 2020-10-20 06:48:10 +0200 |
|---|---|---|
| committer | Richard Levitte <levitte@openssl.org> | 2020-10-21 08:02:55 +0200 |
| commit | 8300a8742b2abc487594a09b5e6ee726dbd30771 (patch) | |
| tree | 19cb8eac9282c4a21607f648fc226c84c25366c3 | |
| parent | 0a737e16b2bc333cc3a8727458acc5460be10e0e (diff) | |
| download | openssl-8300a8742b2abc487594a09b5e6ee726dbd30771.zip openssl-8300a8742b2abc487594a09b5e6ee726dbd30771.tar.gz openssl-8300a8742b2abc487594a09b5e6ee726dbd30771.tar.bz2 | |
Work around Windows ftell() bug as per Microsoft engineering's suggestion
See
https://developercommunity.visualstudio.com/content/problem/425878/fseek-ftell-fail-in-text-mode-for-unix-style-text.html
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13190)
| -rw-r--r-- | crypto/bio/bss_file.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/crypto/bio/bss_file.c b/crypto/bio/bss_file.c index a57bd97..986fba8 100644 --- a/crypto/bio/bss_file.c +++ b/crypto/bio/bss_file.c @@ -237,6 +237,15 @@ static long file_ctrl(BIO *b, int cmd, long num, void *ptr) _setmode(fd, _O_TEXT); else _setmode(fd, _O_BINARY); + /* + * Reports show that ftell() isn't trustable in text mode. + * This has been confirmed as a bug in the Universal C RTL, see + * https://developercommunity.visualstudio.com/content/problem/425878/fseek-ftell-fail-in-text-mode-for-unix-style-text.html + * The suggested work-around from Microsoft engineering is to + * turn off buffering until the bug is resolved. + */ + if ((num & BIO_FP_TEXT) != 0) + setvbuf((FILE *)ptr, NULL, _IONBF, 0); # elif defined(OPENSSL_SYS_MSDOS) int fd = fileno((FILE *)ptr); /* Set correct text/binary mode */ |