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Annotation of src/usr.bin/cmp/regular.c, Revision 1.7

1.7     ! millert     1: /*      $OpenBSD: regular.c,v 1.6 2001/07/12 05:16:58 deraadt Exp $      */
1.1       deraadt     2: /*      $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $      */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1991, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
1.7     ! millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: #if 0
                     35: static char sccsid[] = "@(#)regular.c  8.3 (Berkeley) 4/2/94";
                     36: #else
1.7     ! millert    37: static char rcsid[] = "$OpenBSD: regular.c,v 1.6 2001/07/12 05:16:58 deraadt Exp $";
1.1       deraadt    38: #endif
                     39: #endif /* not lint */
                     40:
                     41: #include <sys/param.h>
                     42: #include <sys/mman.h>
                     43: #include <sys/stat.h>
                     44:
                     45: #include <err.h>
                     46: #include <limits.h>
                     47: #include <stdlib.h>
                     48: #include <stdio.h>
                     49: #include <string.h>
                     50:
                     51: #include "extern.h"
                     52:
                     53: void
                     54: c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
                     55:        int fd1, fd2;
                     56:        char *file1, *file2;
                     57:        off_t skip1, len1, skip2, len2;
                     58: {
                     59:        u_char ch, *p1, *p2;
                     60:        off_t byte, length, line;
                     61:        int dfound;
                     62:
                     63:        if (sflag && len1 != len2)
                     64:                exit(1);
                     65:
                     66:        if (skip1 > len1)
                     67:                eofmsg(file1);
                     68:        len1 -= skip1;
                     69:        if (skip2 > len2)
                     70:                eofmsg(file2);
                     71:        len2 -= skip2;
                     72:
                     73:        length = MIN(len1, len2);
1.4       kevlo      74:        if (length > SIZE_T_MAX) {
                     75:        mmap_failed:
                     76:                c_special(fd1, file1, skip1, fd2, file2, skip2);
                     77:                return;
                     78:        }
1.1       deraadt    79:
1.3       mickey     80:        if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
1.5       deraadt    81:            MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
                     82:                goto mmap_failed;
1.3       mickey     83:        if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
1.5       deraadt    84:            MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
1.4       kevlo      85:                munmap(p1, (size_t)length);
                     86:                goto mmap_failed;
                     87:        }
1.1       deraadt    88:
                     89:        dfound = 0;
                     90:        for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
1.3       mickey     91:                if ((ch = *p1) != *p2) {
1.1       deraadt    92:                        if (lflag) {
                     93:                                dfound = 1;
1.6       deraadt    94:                                (void)printf("%6lld %3o %3o\n", (long long)byte,
                     95:                                    ch, *p2);
1.1       deraadt    96:                        } else
                     97:                                diffmsg(file1, file2, byte, line);
                     98:                                /* NOTREACHED */
1.3       mickey     99:                }
1.1       deraadt   100:                if (ch == '\n')
                    101:                        ++line;
                    102:        }
                    103:
                    104:        if (len1 != len2)
                    105:                eofmsg (len1 > len2 ? file2 : file1);
                    106:        if (dfound)
                    107:                exit(DIFF_EXIT);
                    108: }