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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: ungetc.c

/*
 * Copyright (c) 2000-2001, 2004 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_IDSTR(id, "@(#)$Id: ungetc.c,v 1.31 2013-11-22 20:51:44 ca Exp $")

#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sm/time.h>
#include <errno.h>
#include <sm/io.h>
#include <sm/heap.h>
#include <sm/assert.h>
#include <sm/conf.h>
#include "local.h"

static void	sm_submore_x __P((SM_FILE_T *));

/*
**  SM_SUBMORE_X -- expand ungetc buffer
**
**  Expand the ungetc buffer `in place'.  That is, adjust fp->f_p when
**  the buffer moves, so that it points the same distance from the end,
**  and move the bytes in the buffer around as necessary so that they
**  are all at the end (stack-style).
**
**	Parameters:
**		fp -- the file pointer
**
**	Results:
**		none.
**
**	Exceptions:
**		F:sm_heap -- out of memory
*/

static void
sm_submore_x(fp)
	SM_FILE_T *fp;
{
	register int i;
	register unsigned char *p;

if (fp->f_ub.smb_base == fp->f_ubuf)
	{
		/* Get a buffer; f_ubuf is fixed size. */
		p = sm_malloc_x((size_t) SM_IO_BUFSIZ);
		fp->f_ub.smb_base = p;
		fp->f_ub.smb_size = SM_IO_BUFSIZ;
		p += SM_IO_BUFSIZ - sizeof(fp->f_ubuf);
		for (i = sizeof(fp->f_ubuf); --i >= 0;)
			p[i] = fp->f_ubuf[i];
		fp->f_p = p;
		return;
	}
	i = fp->f_ub.smb_size;
	p = sm_realloc_x(fp->f_ub.smb_base, i << 1);

/* no overlap (hence can use memcpy) because we doubled the size */
	(void) memcpy((void *) (p + i), (void *) p, (size_t) i);
	fp->f_p = p + i;
	fp->f_ub.smb_base = p;
	fp->f_ub.smb_size = i << 1;
}

/*
**  SM_IO_UNGETC -- place a character back into the buffer just read
**
**	Parameters:
**		fp -- the file pointer affected
**		timeout -- time to complete ungetc
**		c -- the character to place back
**
**	Results:
**		On success, returns value of character placed back, 0-255.
**		Returns SM_IO_EOF if c == SM_IO_EOF or if last operation
**		was a write and flush failed.
**
**	Exceptions:
**		F:sm_heap -- out of memory
*/

int
sm_io_ungetc(fp, timeout, c)
	register SM_FILE_T *fp;
	int timeout;
	int c;
{
	SM_REQUIRE_ISA(fp, SmFileMagic);
	if (c == SM_IO_EOF)
		return SM_IO_EOF;
	if (timeout == SM_TIME_IMMEDIATE)
	{
		/*
		**  Ungetting the buffer will take time and we are wanted to
		**  return immediately. So...
		*/

errno = EAGAIN;
		return SM_IO_EOF;
	}

if (!Sm_IO_DidInit)
		sm_init();
	if ((fp->f_flags & SMRD) == 0)
	{
		/*
		**  Not already reading: no good unless reading-and-writing.
		**  Otherwise, flush any current write stuff.
		*/

if ((fp->f_flags & SMRW) == 0)
			return SM_IO_EOF;
		if (fp->f_flags & SMWR)
		{
			if (sm_flush(fp, &timeout))
				return SM_IO_EOF;
			fp->f_flags &= ~SMWR;
			fp->f_w = 0;
			fp->f_lbfsize = 0;
		}
		fp->f_flags |= SMRD;
	}
	c = (unsigned char) c;

/*
	**  If we are in the middle of ungetc'ing, just continue.
	**  This may require expanding the current ungetc buffer.
	*/

if (HASUB(fp))
	{
		if (fp->f_r >= fp->f_ub.smb_size)
			sm_submore_x(fp);
		*--fp->f_p = c;
		fp->f_r++;
		return c;
	}
	fp->f_flags &= ~SMFEOF;

/*
	**  If we can handle this by simply backing up, do so,
	**  but never replace the original character.
	**  (This makes sscanf() work when scanning `const' data.)
	*/

if (fp->f_bf.smb_base != NULL && fp->f_p > fp->f_bf.smb_base &&
	    fp->f_p[-1] == c)
	{
		fp->f_p--;
		fp->f_r++;
		return c;
	}

/*
	**  Create an ungetc buffer.
	**  Initially, we will use the `reserve' buffer.
	*/

fp->f_ur = fp->f_r;
	fp->f_up = fp->f_p;
	fp->f_ub.smb_base = fp->f_ubuf;
	fp->f_ub.smb_size = sizeof(fp->f_ubuf);
	fp->f_ubuf[sizeof(fp->f_ubuf) - 1] = c;
	fp->f_p = &fp->f_ubuf[sizeof(fp->f_ubuf) - 1];
	fp->f_r = 1;

return c;
}

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Editing: ungetc.c

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