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📁 ..
📄 Makefile.inc(3.9 KB)
📄 Symbol.map(2.58 KB)
📄 _flock_stub.c(3.65 KB)
📄 asprintf.c(2.34 KB)
📄 clrerr.c(2.13 KB)
📄 dprintf.c(1.68 KB)
📄 fclose.3(4.04 KB)
📄 fclose.c(3.66 KB)
📄 fcloseall.c(1.55 KB)
📄 fdopen.c(3.41 KB)
📄 feof.c(2.14 KB)
📄 ferror.3(3.67 KB)
📄 ferror.c(2.16 KB)
📄 fflush.3(3.67 KB)
📄 fflush.c(4.15 KB)
📄 fgetc.c(2.18 KB)
📄 fgetln.3(4.45 KB)
📄 fgetln.c(4.62 KB)
📄 fgetpos.c(2.07 KB)
📄 fgets.3(3.76 KB)
📄 fgets.c(3.37 KB)
📄 fgetwc.c(3.02 KB)
📄 fgetwln.3(3.49 KB)
📄 fgetwln.c(2.74 KB)
📄 fgetws.3(3.47 KB)
📄 fgetws.c(3.46 KB)
📄 fileno.c(2.16 KB)
📄 findfp.c(6.1 KB)
📄 flags.c(3.1 KB)
📄 floatio.h(2.43 KB)
📄 flockfile.3(3.05 KB)
📄 fmemopen.c(5.74 KB)
📄 fopen.3(7.66 KB)
📄 fopen.c(3.33 KB)
📄 fopencookie.3(3.9 KB)
📄 fopencookie.c(4.04 KB)
📄 fprintf.c(2.52 KB)
📄 fpurge.c(2.41 KB)
📄 fputc.c(2.29 KB)
📄 fputs.3(3.2 KB)
📄 fputs.c(2.63 KB)
📄 fputwc.c(2.52 KB)
📄 fputws.3(2.71 KB)
📄 fputws.c(2.64 KB)
📄 fread.3(3.77 KB)
📄 fread.c(3.53 KB)
📄 freopen.c(7.35 KB)
📄 fscanf.c(2.71 KB)
📄 fseek.3(6.03 KB)
📄 fseek.c(7.46 KB)
📄 fsetpos.c(2.03 KB)
📄 ftell.c(3.78 KB)
📄 funopen.3(4.71 KB)
📄 funopen.c(2.59 KB)
📄 fvwrite.c(5.7 KB)
📄 fvwrite.h(1.96 KB)
📄 fwalk.c(2.48 KB)
📄 fwide.3(2.58 KB)
📄 fwide.c(1.83 KB)
📄 fwprintf.c(2.06 KB)
📄 fwrite.c(3.45 KB)
📄 fwscanf.c(2.04 KB)
📄 getc.3(4.41 KB)
📄 getc.c(2.27 KB)
📄 getchar.c(2.34 KB)
📄 getdelim.c(4.17 KB)
📄 getline.3(3.56 KB)
📄 getline.c(1.6 KB)
📄 gets.c(2.56 KB)
📄 gets_s.c(3.03 KB)
📄 getw.c(1.97 KB)
📄 getwc.3(3.31 KB)
📄 getwc.c(2.01 KB)
📄 getwchar.c(1.93 KB)
📄 glue.h(1.95 KB)
📄 local.h(5.46 KB)
📄 makebuf.c(3.61 KB)
📄 mktemp.3(7.46 KB)
📄 mktemp.c(5.04 KB)
📄 open_memstream.3(4.61 KB)
📄 open_memstream.c(4.79 KB)
📄 open_wmemstream.c(6.34 KB)
📄 perror.c(2.55 KB)
📄 printf-pos.c(17.48 KB)
📄 printf.3(22.15 KB)
📄 printf.c(2.43 KB)
📄 printf_l.3(3.15 KB)
📄 printfcommon.h(7.42 KB)
📄 printflocal.h(3.3 KB)
📄 putc.3(4.1 KB)
📄 putc.c(2.29 KB)
📄 putchar.c(2.36 KB)
📄 puts.c(2.49 KB)
📄 putw.c(2.28 KB)
📄 putwc.3(2.79 KB)
📄 putwc.c(2.09 KB)
📄 putwchar.c(2 KB)
📄 refill.c(4.04 KB)
📄 remove.3(2.52 KB)
📄 remove.c(2.11 KB)
📄 rewind.c(2.26 KB)
📄 rget.c(2.12 KB)
📄 scanf.3(11.79 KB)
📄 scanf.c(2.68 KB)
📄 scanf_l.3(2.7 KB)
📄 setbuf.3(5.54 KB)
📄 setbuf.c(2.02 KB)
📄 setbuffer.c(2.11 KB)
📄 setvbuf.c(4.71 KB)
📄 snprintf.c(3.12 KB)
📄 sprintf.c(2.54 KB)
📄 sscanf.c(2.52 KB)
📄 stdio.3(10.54 KB)
📄 stdio.c(4.27 KB)
📄 swprintf.c(2.09 KB)
📄 swscanf.c(2.07 KB)
📄 tempnam.c(2.86 KB)
📄 tmpfile.c(2.83 KB)
📄 tmpnam.3(6.08 KB)
📄 tmpnam.c(2.27 KB)
📄 ungetc.3(3.19 KB)
📄 ungetc.c(4.5 KB)
📄 ungetwc.3(3.13 KB)
📄 ungetwc.c(2.57 KB)
📄 vasprintf.c(2.52 KB)
📄 vdprintf.c(2.23 KB)
📄 vfprintf.c(26.28 KB)
📄 vfscanf.c(24.59 KB)
📄 vfwprintf.c(27.54 KB)
📄 vfwscanf.c(21.37 KB)
📄 vprintf.c(2.3 KB)
📄 vscanf.c(2.54 KB)
📄 vsnprintf.c(2.91 KB)
📄 vsprintf.c(2.58 KB)
📄 vsscanf.c(2.72 KB)
📄 vswprintf.c(3.32 KB)
📄 vswscanf.c(3.36 KB)
📄 vwprintf.c(1.9 KB)
📄 vwscanf.c(1.9 KB)
📄 wbuf.c(3.25 KB)
📄 wprintf.3(15.62 KB)
📄 wprintf.c(2.02 KB)
📄 wscanf.3(11.31 KB)
📄 wscanf.c(2 KB)
📄 wsetup.c(3.05 KB)
📄 xprintf.c(16.71 KB)
📄 xprintf_errno.c(2.18 KB)
📄 xprintf_float.c(11.33 KB)
📄 xprintf_hexdump.c(2.65 KB)
📄 xprintf_int.c(10.47 KB)
📄 xprintf_quote.c(2.83 KB)
📄 xprintf_str.c(5.04 KB)
📄 xprintf_time.c(3.46 KB)
📄 xprintf_vis.c(2.41 KB)

Editing: ungetc.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ungetc.c	8.2 (Berkeley) 11/3/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "namespace.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "un-namespace.h"
#include "local.h"
#include "libc_private.h"

static int __submore(FILE *);

/*
 * Expand the ungetc buffer `in place'.  That is, adjust fp->_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).
 */
static int
__submore(FILE *fp)
{
	int i;
	unsigned char *p;

if (fp->_ub._base == fp->_ubuf) {
		/*
		 * Get a new buffer (rather than expanding the old one).
		 */
		if ((p = malloc((size_t)BUFSIZ)) == NULL)
			return (EOF);
		fp->_ub._base = p;
		fp->_ub._size = BUFSIZ;
		p += BUFSIZ - sizeof(fp->_ubuf);
		for (i = sizeof(fp->_ubuf); --i >= 0;)
			p[i] = fp->_ubuf[i];
		fp->_p = p;
		return (0);
	}
	i = fp->_ub._size;
	p = reallocarray(fp->_ub._base, i, 2);
	if (p == NULL)
		return (EOF);
	/* no overlap (hence can use memcpy) because we doubled the size */
	(void)memcpy((void *)(p + i), (void *)p, (size_t)i);
	fp->_p = p + i;
	fp->_ub._base = p;
	fp->_ub._size = i * 2;
	return (0);
}

/*
 * MT-safe version
 */
int
ungetc(int c, FILE *fp)
{
	int ret;

if (!__sdidinit)
		__sinit();
	FLOCKFILE_CANCELSAFE(fp);
	ORIENT(fp, -1);
	ret = __ungetc(c, fp);
	FUNLOCKFILE_CANCELSAFE();
	return (ret);
}

/*
 * Non-MT-safe version
 */
int
__ungetc(int c, FILE *fp)
{

if (c == EOF)
		return (EOF);
	if ((fp->_flags & __SRD) == 0) {
		/*
		 * Not already reading: no good unless reading-and-writing.
		 * Otherwise, flush any current write stuff.
		 */
		if ((fp->_flags & __SRW) == 0)
			return (EOF);
		if (fp->_flags & __SWR) {
			if (__sflush(fp))
				return (EOF);
			fp->_flags &= ~__SWR;
			fp->_w = 0;
			fp->_lbfsize = 0;
		}
		fp->_flags |= __SRD;
	}
	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->_r >= fp->_ub._size && __submore(fp))
			return (EOF);
		*--fp->_p = c;
		fp->_r++;
		return (c);
	}
	fp->_flags &= ~__SEOF;

/*
	 * 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->_bf._base != NULL && fp->_p > fp->_bf._base &&
	    fp->_p[-1] == c) {
		fp->_p--;
		fp->_r++;
		return (c);
	}

/*
	 * Create an ungetc buffer.
	 * Initially, we will use the `reserve' buffer.
	 */
	fp->_ur = fp->_r;
	fp->_up = fp->_p;
	fp->_ub._base = fp->_ubuf;
	fp->_ub._size = sizeof(fp->_ubuf);
	fp->_ubuf[sizeof(fp->_ubuf) - 1] = c;
	fp->_p = &fp->_ubuf[sizeof(fp->_ubuf) - 1];
	fp->_r = 1;
	return (c);
}

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Editing: ungetc.c

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