1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char sccsid[] = "@(#)special.c 8.3 (Berkeley) 4/2/94"; 35 #endif 36 #endif 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/types.h> 42 43 #include <capsicum_helpers.h> 44 #include <err.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 48 #include "extern.h" 49 50 void 51 c_special(int fd1, const char *file1, off_t skip1, 52 int fd2, const char *file2, off_t skip2, off_t limit) 53 { 54 int ch1, ch2; 55 off_t byte, line; 56 FILE *fp1, *fp2; 57 int dfound; 58 59 if (caph_limit_stream(fd1, CAPH_READ) < 0) 60 err(ERR_EXIT, "caph_limit_stream(%s)", file1); 61 if (caph_limit_stream(fd2, CAPH_READ) < 0) 62 err(ERR_EXIT, "caph_limit_stream(%s)", file2); 63 if (caph_enter() < 0) 64 err(ERR_EXIT, "unable to enter capability mode"); 65 66 if ((fp1 = fdopen(fd1, "r")) == NULL) 67 err(ERR_EXIT, "%s", file1); 68 (void)setvbuf(fp1, NULL, _IOFBF, 65536); 69 if ((fp2 = fdopen(fd2, "r")) == NULL) 70 err(ERR_EXIT, "%s", file2); 71 (void)setvbuf(fp2, NULL, _IOFBF, 65536); 72 73 dfound = 0; 74 while (skip1--) 75 if (getc(fp1) == EOF) 76 goto eof; 77 while (skip2--) 78 if (getc(fp2) == EOF) 79 goto eof; 80 81 for (byte = line = 1; limit == 0 || byte <= limit; ++byte) { 82 #ifdef SIGINFO 83 if (info) { 84 (void)fprintf(stderr, "%s %s char %zu line %zu\n", 85 file1, file2, (size_t)byte, (size_t)line); 86 info = 0; 87 } 88 #endif 89 ch1 = getc(fp1); 90 ch2 = getc(fp2); 91 if (ch1 == EOF || ch2 == EOF) 92 break; 93 if (ch1 != ch2) { 94 if (xflag) { 95 dfound = 1; 96 (void)printf("%08llx %02x %02x\n", 97 (long long)byte - 1, ch1, ch2); 98 } else if (lflag) { 99 dfound = 1; 100 if (bflag) 101 (void)printf("%6lld %3o %c %3o %c\n", 102 (long long)byte, ch1, ch1, ch2, 103 ch2); 104 else 105 (void)printf("%6lld %3o %3o\n", 106 (long long)byte, ch1, ch2); 107 } else { 108 diffmsg(file1, file2, byte, line, ch1, ch2); 109 /* NOTREACHED */ 110 } 111 } 112 if (ch1 == '\n') 113 ++line; 114 } 115 116 eof: if (ferror(fp1)) 117 err(ERR_EXIT, "%s", file1); 118 if (ferror(fp2)) 119 err(ERR_EXIT, "%s", file2); 120 if (feof(fp1)) { 121 if (!feof(fp2)) 122 eofmsg(file1); 123 } else 124 if (feof(fp2)) 125 eofmsg(file2); 126 fclose(fp2); 127 fclose(fp1); 128 if (dfound) 129 exit(DIFF_EXIT); 130 } 131