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Annotation of src/usr.bin/cmp/regular.c, Revision 1.11

1.11    ! deraadt     1: /*      $OpenBSD: regular.c,v 1.10 2011/01/19 13:01:25 okan 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: #include <sys/mman.h>
                     34: #include <sys/stat.h>
                     35:
                     36: #include <err.h>
                     37: #include <limits.h>
                     38: #include <stdlib.h>
                     39: #include <stdio.h>
                     40: #include <string.h>
                     41:
                     42: #include "extern.h"
                     43:
1.11    ! deraadt    44: #define        MINIMUM(a, b)   (((a) < (b)) ? (a) : (b))
        !            45:
1.1       deraadt    46: void
1.10      okan       47: c_regular(int fd1, char *file1, off_t skip1, off_t len1,
                     48:     int fd2, char *file2, off_t skip2, off_t len2)
1.1       deraadt    49: {
                     50:        u_char ch, *p1, *p2;
                     51:        off_t byte, length, line;
                     52:        int dfound;
                     53:
                     54:        if (sflag && len1 != len2)
                     55:                exit(1);
                     56:
                     57:        if (skip1 > len1)
                     58:                eofmsg(file1);
                     59:        len1 -= skip1;
                     60:        if (skip2 > len2)
                     61:                eofmsg(file2);
                     62:        len2 -= skip2;
                     63:
1.11    ! deraadt    64:        length = MINIMUM(len1, len2);
1.4       kevlo      65:        if (length > SIZE_T_MAX) {
                     66:        mmap_failed:
                     67:                c_special(fd1, file1, skip1, fd2, file2, skip2);
                     68:                return;
                     69:        }
1.1       deraadt    70:
1.3       mickey     71:        if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
1.5       deraadt    72:            MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
                     73:                goto mmap_failed;
1.3       mickey     74:        if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
1.5       deraadt    75:            MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
1.4       kevlo      76:                munmap(p1, (size_t)length);
                     77:                goto mmap_failed;
1.8       mickey     78:        }
                     79:        if (length) {
                     80:                madvise(p1, length, MADV_SEQUENTIAL);
                     81:                madvise(p2, length, MADV_SEQUENTIAL);
1.4       kevlo      82:        }
1.1       deraadt    83:
                     84:        dfound = 0;
                     85:        for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
1.3       mickey     86:                if ((ch = *p1) != *p2) {
1.1       deraadt    87:                        if (lflag) {
                     88:                                dfound = 1;
1.6       deraadt    89:                                (void)printf("%6lld %3o %3o\n", (long long)byte,
                     90:                                    ch, *p2);
1.1       deraadt    91:                        } else
                     92:                                diffmsg(file1, file2, byte, line);
                     93:                                /* NOTREACHED */
1.3       mickey     94:                }
1.1       deraadt    95:                if (ch == '\n')
                     96:                        ++line;
                     97:        }
                     98:
                     99:        if (len1 != len2)
                    100:                eofmsg (len1 > len2 ? file2 : file1);
                    101:        if (dfound)
                    102:                exit(DIFF_EXIT);
                    103: }