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 #include <sys/types.h> 33 34 #include <capsicum_helpers.h> 35 #include <err.h> 36 #include <stdlib.h> 37 #include <stdio.h> 38 39 #include "extern.h" 40 41 void 42 c_special(int fd1, const char *file1, off_t skip1, 43 int fd2, const char *file2, off_t skip2, off_t limit) 44 { 45 int ch1, ch2; 46 off_t byte, line; 47 FILE *fp1, *fp2; 48 int dfound; 49 50 if (caph_limit_stream(fd1, CAPH_READ) < 0) 51 err(ERR_EXIT, "caph_limit_stream(%s)", file1); 52 if (caph_limit_stream(fd2, CAPH_READ) < 0) 53 err(ERR_EXIT, "caph_limit_stream(%s)", file2); 54 if (caph_enter() < 0) 55 err(ERR_EXIT, "unable to enter capability mode"); 56 57 if ((fp1 = fdopen(fd1, "r")) == NULL) 58 err(ERR_EXIT, "%s", file1); 59 (void)setvbuf(fp1, NULL, _IOFBF, 65536); 60 if ((fp2 = fdopen(fd2, "r")) == NULL) 61 err(ERR_EXIT, "%s", file2); 62 (void)setvbuf(fp2, NULL, _IOFBF, 65536); 63 64 dfound = 0; 65 while (skip1--) 66 if (getc(fp1) == EOF) 67 goto eof; 68 while (skip2--) 69 if (getc(fp2) == EOF) 70 goto eof; 71 72 for (byte = line = 1; limit == 0 || byte <= limit; ++byte) { 73 #ifdef SIGINFO 74 if (info) { 75 (void)fprintf(stderr, "%s %s char %zu line %zu\n", 76 file1, file2, (size_t)byte, (size_t)line); 77 info = 0; 78 } 79 #endif 80 ch1 = getc(fp1); 81 ch2 = getc(fp2); 82 if (ch1 == EOF || ch2 == EOF) 83 break; 84 if (ch1 != ch2) { 85 if (xflag) { 86 dfound = 1; 87 (void)printf("%08llx %02x %02x\n", 88 (long long)byte - 1, ch1, ch2); 89 } else if (lflag) { 90 dfound = 1; 91 if (bflag) 92 (void)printf("%6lld %3o %c %3o %c\n", 93 (long long)byte, ch1, ch1, ch2, 94 ch2); 95 else 96 (void)printf("%6lld %3o %3o\n", 97 (long long)byte, ch1, ch2); 98 } else { 99 diffmsg(file1, file2, byte, line, ch1, ch2); 100 /* NOTREACHED */ 101 } 102 } 103 if (ch1 == '\n') 104 ++line; 105 } 106 107 eof: if (ferror(fp1)) 108 err(ERR_EXIT, "%s", file1); 109 if (ferror(fp2)) 110 err(ERR_EXIT, "%s", file2); 111 if (feof(fp1)) { 112 if (!feof(fp2)) 113 eofmsg(file1); 114 } else 115 if (feof(fp2)) 116 eofmsg(file2); 117 fclose(fp2); 118 fclose(fp1); 119 if (dfound) 120 exit(DIFF_EXIT); 121 } 122