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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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.
*/
#include <sys/types.h>
#include <capsicum_helpers.h>
#include <err.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include "extern.h"
int
c_special(int fd1, const char *file1, off_t skip1,
int fd2, const char *file2, off_t skip2, off_t limit)
{
int ch1, ch2;
off_t byte, line;
FILE *fp1, *fp2;
int dfound;
if (caph_limit_stream(fd1, CAPH_READ) < 0)
err(ERR_EXIT, "caph_limit_stream(%s)", file1);
if (caph_limit_stream(fd2, CAPH_READ) < 0)
err(ERR_EXIT, "caph_limit_stream(%s)", file2);
if (caph_enter() < 0)
err(ERR_EXIT, "unable to enter capability mode");
if ((fp1 = fdopen(fd1, "r")) == NULL)
err(ERR_EXIT, "%s", file1);
(void)setvbuf(fp1, NULL, _IOFBF, 65536);
if ((fp2 = fdopen(fd2, "r")) == NULL)
err(ERR_EXIT, "%s", file2);
(void)setvbuf(fp2, NULL, _IOFBF, 65536);
dfound = 0;
while (skip1--)
if (getc(fp1) == EOF)
goto eof;
while (skip2--)
if (getc(fp2) == EOF)
goto eof;
for (byte = line = 1; limit == 0 || byte <= limit; ++byte) {
#ifdef SIGINFO
if (info) {
(void)fprintf(stderr, "%s %s char %zu line %zu\n",
file1, file2, (size_t)byte, (size_t)line);
info = 0;
}
#endif
ch1 = getc(fp1);
ch2 = getc(fp2);
if (ch1 == EOF || ch2 == EOF)
break;
if (ch1 != ch2) {
if (xflag) {
dfound = 1;
(void)printf("%08llx %02x %02x\n",
(long long)byte - 1, ch1, ch2);
} else if (lflag) {
dfound = 1;
if (bflag)
(void)printf("%6lld %3o %c %3o %c\n",
(long long)byte, ch1, ch1, ch2,
ch2);
else
(void)printf("%6lld %3o %3o\n",
(long long)byte, ch1, ch2);
} else {
diffmsg(file1, file2, byte, line, ch1, ch2);
return (DIFF_EXIT);
}
}
if (ch1 == '\n')
++line;
}
eof: if (ferror(fp1))
err(ERR_EXIT, "%s", file1);
if (ferror(fp2))
err(ERR_EXIT, "%s", file2);
if (feof(fp1)) {
if (!feof(fp2)) {
eofmsg(file1);
return (DIFF_EXIT);
}
} else {
if (feof(fp2)) {
eofmsg(file2);
return (DIFF_EXIT);
}
}
fclose(fp2);
fclose(fp1);
return (dfound ? DIFF_EXIT : 0);
}
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