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author | gshapiro <gshapiro@FreeBSD.org> | 2002-02-17 21:56:45 +0000 |
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committer | gshapiro <gshapiro@FreeBSD.org> | 2002-02-17 21:56:45 +0000 |
commit | 8449595fe97f4474b9b9a7e4edee1ef35dcff393 (patch) | |
tree | e7a33b132264d449a512ddf4a8685df097669c1d /contrib/sendmail/libsm/wbuf.c | |
parent | 289b381b31415647269c7520d881017e2dcb27f1 (diff) | |
download | FreeBSD-src-8449595fe97f4474b9b9a7e4edee1ef35dcff393.zip FreeBSD-src-8449595fe97f4474b9b9a7e4edee1ef35dcff393.tar.gz |
Import sendmail 8.12.2
Diffstat (limited to 'contrib/sendmail/libsm/wbuf.c')
-rw-r--r-- | contrib/sendmail/libsm/wbuf.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/wbuf.c b/contrib/sendmail/libsm/wbuf.c new file mode 100644 index 0000000..8385535 --- /dev/null +++ b/contrib/sendmail/libsm/wbuf.c @@ -0,0 +1,88 @@ +/* + * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. + * All rights reserved. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * By using this file, you agree to the terms and conditions set + * forth in the LICENSE file which can be found at the top level of + * the sendmail distribution. + */ + +#include <sm/gen.h> +SM_RCSID("@(#)$Id: wbuf.c,v 1.21 2001/09/11 04:04:49 gshapiro Exp $") +#include <errno.h> +#include <sm/io.h> +#include "local.h" + +/* Note: This function is called from a macro located in <sm/io.h> */ + +/* +** SM_WBUF -- write character to and flush (likely now full) buffer +** +** Write the given character into the (probably full) buffer for +** the given file. Flush the buffer out if it is or becomes full, +** or if c=='\n' and the file is line buffered. +** +** Parameters: +** fp -- the file pointer +** timeout -- time to complete operation (milliseconds) +** c -- int representation of the character to add +** +** Results: +** Failure: -1 and sets errno +** Success: int value of 'c' +*/ + +int +sm_wbuf(fp, timeout, c) + register SM_FILE_T *fp; + int timeout; + register int c; +{ + register int n; + + /* + ** In case we cannot write, or longjmp takes us out early, + ** make sure w is 0 (if fully- or un-buffered) or -bf.smb_size + ** (if line buffered) so that we will get called again. + ** If we did not do this, a sufficient number of sm_io_putc() + ** calls might wrap w from negative to positive. + */ + + fp->f_w = fp->f_lbfsize; + if (cantwrite(fp)) + { + errno = EBADF; + return SM_IO_EOF; + } + c = (unsigned char)c; + + /* + ** If it is completely full, flush it out. Then, in any case, + ** stuff c into the buffer. If this causes the buffer to fill + ** completely, or if c is '\n' and the file is line buffered, + ** flush it (perhaps a second time). The second flush will always + ** happen on unbuffered streams, where bf.smb_size==1; sm_io_flush() + ** guarantees that sm_io_putc() will always call sm_wbuf() by setting + ** w to 0, so we need not do anything else. + ** Note for the timeout, only one of the sm_io_flush's will get called. + */ + + n = fp->f_p - fp->f_bf.smb_base; + if (n >= fp->f_bf.smb_size) + { + if (sm_io_flush(fp, timeout)) + return SM_IO_EOF; /* sm_io_flush() sets errno */ + n = 0; + } + fp->f_w--; + *fp->f_p++ = c; + if (++n == fp->f_bf.smb_size || (fp->f_flags & SMLBF && c == '\n')) + if (sm_io_flush(fp, timeout)) + return SM_IO_EOF; /* sm_io_flush() sets errno */ + return c; +} |