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 <stdbool.h> 37 #include <stdlib.h> 38 #include <stdio.h> 39 40 #include "extern.h" 41 42 int 43 c_special(int fd1, const char *file1, off_t skip1, 44 int fd2, const char *file2, off_t skip2, off_t limit) 45 { 46 int ch1, ch2; 47 off_t byte, line; 48 FILE *fp1, *fp2; 49 int dfound; 50 51 if (caph_limit_stream(fd1, CAPH_READ) < 0) 52 err(ERR_EXIT, "caph_limit_stream(%s)", file1); 53 if (caph_limit_stream(fd2, CAPH_READ) < 0) 54 err(ERR_EXIT, "caph_limit_stream(%s)", file2); 55 if (caph_enter() < 0) 56 err(ERR_EXIT, "unable to enter capability mode"); 57 58 if ((fp1 = fdopen(fd1, "r")) == NULL) 59 err(ERR_EXIT, "%s", file1); 60 (void)setvbuf(fp1, NULL, _IOFBF, 65536); 61 if ((fp2 = fdopen(fd2, "r")) == NULL) 62 err(ERR_EXIT, "%s", file2); 63 (void)setvbuf(fp2, NULL, _IOFBF, 65536); 64 65 dfound = 0; 66 while (skip1--) 67 if (getc(fp1) == EOF) 68 goto eof; 69 while (skip2--) 70 if (getc(fp2) == EOF) 71 goto eof; 72 73 for (byte = line = 1; limit == 0 || byte <= limit; ++byte) { 74 #ifdef SIGINFO 75 if (info) { 76 (void)fprintf(stderr, "%s %s char %zu line %zu\n", 77 file1, file2, (size_t)byte, (size_t)line); 78 info = 0; 79 } 80 #endif 81 ch1 = getc(fp1); 82 ch2 = getc(fp2); 83 if (ch1 == EOF || ch2 == EOF) 84 break; 85 if (ch1 != ch2) { 86 if (xflag) { 87 dfound = 1; 88 (void)printf("%08llx %02x %02x\n", 89 (long long)byte - 1, ch1, ch2); 90 } else if (lflag) { 91 dfound = 1; 92 if (bflag) 93 (void)printf("%6lld %3o %c %3o %c\n", 94 (long long)byte, ch1, ch1, ch2, 95 ch2); 96 else 97 (void)printf("%6lld %3o %3o\n", 98 (long long)byte, ch1, ch2); 99 } else { 100 diffmsg(file1, file2, byte, line, ch1, ch2); 101 return (DIFF_EXIT); 102 } 103 } 104 if (ch1 == '\n') 105 ++line; 106 } 107 108 eof: if (ferror(fp1)) 109 err(ERR_EXIT, "%s", file1); 110 if (ferror(fp2)) 111 err(ERR_EXIT, "%s", file2); 112 if (feof(fp1)) { 113 if (!feof(fp2)) { 114 eofmsg(file1); 115 return (DIFF_EXIT); 116 } 117 } else { 118 if (feof(fp2)) { 119 eofmsg(file2); 120 return (DIFF_EXIT); 121 } 122 } 123 fclose(fp2); 124 fclose(fp1); 125 return (dfound ? DIFF_EXIT : 0); 126 } 127