ghelmer@dsuvax.uucp (Guy Helmer) (04/15/91)
Here's a quick change to Earl Chew's stdio that I believe mimics the
behavior of other stdio implementations, at least the BSD and Microsoft C
environments, if nothing else. When a file is fopen'ed with the "a"
option, ftell() would return incorrect values for the location of
the file pointer until a write from the stdio buffer was forced.
This change corrects the behavior for the case of a single process
appending a file. To account for multiple writers appending to a file
through stdio, much more work would be required; I've chosen to not
concern myself with this more general case yet (right now I just need the
functionality for a single process).
Here's the straight fix. It's small enough that BITNET and other
mail-munching networks shouldn't render it unreadable even though it's
in source form:
*** _fopen.c.orig Thu Aug 9 03:06:05 1990
--- _fopen.c Thu Apr 4 18:56:47 1991
***************
*** 68,73 ****
if (fd < 0)
fd = open(name, openmode, CREATMODE);
}
!
return fd;
}
--- 68,74 ----
if (fd < 0)
fd = open(name, openmode, CREATMODE);
}
! if (fd > -1 && (openmode & O_APPEND) != 0)
! lseek(fd, 0L, SEEK_END);
return fd;
}
--
Guy Helmer, Dakota State University Computing Services
helmer@sdnet.bitnet, dsuvax!ghelmer@wunoc.wustl.edu, wupost!dsuvax!ghelmer
"I'm a cowboy, on a keyboard I ride..."
-- with apologies to Bon Jovi