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📁 ..
📄 Makefile(346 B)
📄 Makefile.m4(1.92 KB)
📄 README(4.42 KB)
📄 assert.c(4.13 KB)
📄 assert.html(13.86 KB)
📄 b-strcmp.c(3.4 KB)
📄 b-strl.c(5 KB)
📄 cdefs.html(2.39 KB)
📄 cf.c(1.97 KB)
📄 clock.c(13.89 KB)
📄 clrerr.c(872 B)
📄 config.c(4.47 KB)
📄 debug.c(8.91 KB)
📄 debug.html(7.68 KB)
📄 errstring.c(6.03 KB)
📄 exc.c(13.05 KB)
📄 exc.html(23.27 KB)
📄 fclose.c(3.13 KB)
📄 feof.c(961 B)
📄 ferror.c(932 B)
📄 fflush.c(3.1 KB)
📄 fget.c(2.37 KB)
📄 findfp.c(10.65 KB)
📄 flags.c(1.27 KB)
📄 fopen.c(8.3 KB)
📄 fpos.c(3.12 KB)
📄 fprintf.c(1.35 KB)
📄 fpurge.c(1.15 KB)
📄 fput.c(1.25 KB)
📄 fread.c(2.28 KB)
📄 fscanf.c(1.34 KB)
📄 fseek.c(7.25 KB)
📄 fvwrite.c(6.24 KB)
📄 fvwrite.h(740 B)
📄 fwalk.c(1.41 KB)
📄 fwrite.c(1.54 KB)
📄 gen.html(910 B)
📄 get.c(1.12 KB)
📄 glue.h(731 B)
📄 heap.c(17.29 KB)
📄 heap.html(13.07 KB)
📄 index.html(5.95 KB)
📄 inet6_ntop.c(1.1 KB)
📄 io.html(26.6 KB)
📄 ldap.c(35.72 KB)
📄 local.h(9.42 KB)
📄 makebuf.c(3.36 KB)
📄 match.c(2.77 KB)
📄 mbdb.c(16.61 KB)
📄 memstat.c(5.13 KB)
📄 mpeix.c(13.84 KB)
📄 niprop.c(4.64 KB)
📄 notify.c(3.32 KB)
📄 put.c(1.61 KB)
📄 refill.c(7.09 KB)
📄 rewind.c(1.08 KB)
📄 rpool.c(11.54 KB)
📄 rpool.html(6.08 KB)
📄 sem.c(4.41 KB)
📄 setvbuf.c(4.2 KB)
📄 shm.c(2.62 KB)
📄 signal.c(6.75 KB)
📄 smstdio.c(6.14 KB)
📄 snprintf.c(2.29 KB)
📄 sscanf.c(2.26 KB)
📄 stdio.c(9.7 KB)
📄 strcasecmp.c(3.14 KB)
📄 strdup.c(2.79 KB)
📄 strerror.c(1.27 KB)
📄 strexit.c(2.76 KB)
📄 string.c(1.29 KB)
📄 stringf.c(1.77 KB)
📄 strio.c(9.18 KB)
📄 strl.c(7.52 KB)
📄 strrevcmp.c(1.61 KB)
📄 strto.c(5.45 KB)
📄 syslogio.c(4.11 KB)
📄 t-cf.c(934 B)
📄 t-event.c(1.79 KB)
📄 t-exc.c(2.75 KB)
📄 t-fget.c(1.71 KB)
📄 t-float.c(1.78 KB)
📄 t-fopen.c(875 B)
📄 t-heap.c(1.3 KB)
📄 t-inet6_ntop.c(1.4 KB)
📄 t-match.c(1.1 KB)
📄 t-memstat.c(2.17 KB)
📄 t-notify.c(1.81 KB)
📄 t-path.c(742 B)
📄 t-qic.c(5.43 KB)
📄 t-rpool.c(1.5 KB)
📄 t-scanf.c(1.38 KB)
📄 t-sem.c(5.85 KB)
📄 t-shm.c(4.42 KB)
📄 t-smstdio.c(1.55 KB)
📄 t-string.c(968 B)
📄 t-strio.c(775 B)
📄 t-strl.c(3.53 KB)
📄 t-strrevcmp.c(994 B)
📄 t-types.c(2.7 KB)
📄 test.c(2.73 KB)
📄 ungetc.c(3.93 KB)
📄 util.c(4.46 KB)
📄 vasprintf.c(2.91 KB)
📄 vfprintf.c(24.09 KB)
📄 vfscanf.c(18.76 KB)
📄 vprintf.c(999 B)
📄 vsnprintf.c(1.87 KB)
📄 wbuf.c(2.51 KB)
📄 wsetup.c(1.88 KB)
📄 xtrap.c(653 B)

Editing: makebuf.c

/*
 * Copyright (c) 2000-2001 Proofpoint, 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: makebuf.c,v 1.27 2013-11-22 20:51:43 ca Exp $")
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sm/io.h>
#include <sm/heap.h>
#include <sm/conf.h>
#include "local.h"

/*
**  SM_MAKEBUF -- make a buffer for the file
**
**	Parameters:
**		fp -- the file to be buffered
**
**	Returns:
**		nothing
**
**	Allocate a file buffer, or switch to unbuffered I/O.
**	By default tty devices default to line buffered.
*/

void
sm_makebuf(fp)
	register SM_FILE_T *fp;
{
	register void *p;
	register int flags;
	size_t size;
	int couldbetty;

if (fp->f_flags & SMNBF)
	{
		fp->f_bf.smb_base = fp->f_p = fp->f_nbuf;
		fp->f_bf.smb_size = 1;
		return;
	}
	flags = sm_whatbuf(fp, &size, &couldbetty);
	if ((p = sm_malloc(size)) == NULL)
	{
		fp->f_flags |= SMNBF;
		fp->f_bf.smb_base = fp->f_p = fp->f_nbuf;
		fp->f_bf.smb_size = 1;
		return;
	}
	if (!Sm_IO_DidInit)
		sm_init();
	flags |= SMMBF;
	fp->f_bf.smb_base = fp->f_p = p;
	fp->f_bf.smb_size = size;
	if (couldbetty && isatty(fp->f_file))
		flags |= SMLBF;
	fp->f_flags |= flags;
}

/*
**  SM_WHATBUF -- determine proper buffer for a file (internal)
**
**  Plus it fills in 'bufsize' for recommended buffer size and
**  fills in flag to indicate if 'fp' could be a tty (nothing
**  to do with "betty" :-) ).
**
**	Parameters:
**		fp -- file pointer to be buffered
**		bufsize -- new buffer size (a return)
**		couldbetty -- could be a tty (returns)
**
**	Returns:
**		Success:
**		on error:
**			SMNPT -- not seek opimized
**			SMOPT -- seek opimized
*/

int
sm_whatbuf(fp, bufsize, couldbetty)
	register SM_FILE_T *fp;
	size_t *bufsize;
	int *couldbetty;
{
	struct stat st;

if (fp->f_file < 0 || fstat(fp->f_file, &st) < 0)
	{
		*couldbetty = 0;
		*bufsize = SM_IO_BUFSIZ;
		return SMNPT;
	}

/* could be a tty iff it is a character device */
	*couldbetty = S_ISCHR(st.st_mode);
	if (st.st_blksize == 0)
	{
		*bufsize = SM_IO_BUFSIZ;
		return SMNPT;
	}

#if SM_IO_MAX_BUF_FILE > 0
	if (S_ISREG(st.st_mode) && st.st_blksize > SM_IO_MAX_BUF_FILE)
		st.st_blksize = SM_IO_MAX_BUF_FILE;
#endif

#if SM_IO_MAX_BUF > 0 || SM_IO_MIN_BUF > 0
	if (!S_ISREG(st.st_mode))
	{
# if SM_IO_MAX_BUF > 0
		if (st.st_blksize > SM_IO_MAX_BUF)
			st.st_blksize = SM_IO_MAX_BUF;
#  if SM_IO_MIN_BUF > 0
		else
#  endif /* SM_IO_MIN_BUF > 0 */
# endif /* SM_IO_MAX_BUF > 0 */
# if SM_IO_MIN_BUF > 0
		if (st.st_blksize < SM_IO_MIN_BUF)
			st.st_blksize = SM_IO_MIN_BUF;
# endif
	}
#endif /* SM_IO_MAX_BUF > 0 || SM_IO_MIN_BUF > 0 */

/*
	**  Optimise fseek() only if it is a regular file.  (The test for
	**  sm_std_seek is mainly paranoia.)  It is safe to set _blksize
	**  unconditionally; it will only be used if SMOPT is also set.
	*/

if ((fp->f_flags & SMSTR) == 0)
	{
		*bufsize = st.st_blksize;
		fp->f_blksize = st.st_blksize;
	}
	else
		*bufsize = SM_IO_BUFSIZ;
	if ((st.st_mode & S_IFMT) == S_IFREG &&
	    fp->f_seek == sm_stdseek)
		return SMOPT;
	else
		return SMNPT;
}

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Editing: makebuf.c

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