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Annotation of src/usr.bin/cmp/regular.c, Revision 1.1.1.1

1.1       deraadt     1: /*      $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $      */
                      2:
                      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. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: #if 0
                     38: static char sccsid[] = "@(#)regular.c  8.3 (Berkeley) 4/2/94";
                     39: #else
                     40: static char rcsid[] = "$NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $";
                     41: #endif
                     42: #endif /* not lint */
                     43:
                     44: #include <sys/param.h>
                     45: #include <sys/mman.h>
                     46: #include <sys/stat.h>
                     47:
                     48: #include <err.h>
                     49: #include <limits.h>
                     50: #include <stdlib.h>
                     51: #include <stdio.h>
                     52: #include <string.h>
                     53:
                     54: #include "extern.h"
                     55:
                     56: void
                     57: c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
                     58:        int fd1, fd2;
                     59:        char *file1, *file2;
                     60:        off_t skip1, len1, skip2, len2;
                     61: {
                     62:        u_char ch, *p1, *p2;
                     63:        off_t byte, length, line;
                     64:        int dfound;
                     65:
                     66:        if (sflag && len1 != len2)
                     67:                exit(1);
                     68:
                     69:        if (skip1 > len1)
                     70:                eofmsg(file1);
                     71:        len1 -= skip1;
                     72:        if (skip2 > len2)
                     73:                eofmsg(file2);
                     74:        len2 -= skip2;
                     75:
                     76:        length = MIN(len1, len2);
                     77:        if (length > SIZE_T_MAX)
                     78:                return (c_special(fd1, file1, skip1, fd2, file2, skip2));
                     79:
                     80:        if ((p1 = (u_char *)mmap(NULL,
                     81:            (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1)
                     82:                err(ERR_EXIT, "%s", file1);
                     83:        if ((p2 = (u_char *)mmap(NULL,
                     84:            (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1)
                     85:                err(ERR_EXIT, "%s", file2);
                     86:
                     87:        dfound = 0;
                     88:        for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
                     89:                if ((ch = *p1) != *p2)
                     90:                        if (lflag) {
                     91:                                dfound = 1;
                     92:                                (void)printf("%6qd %3o %3o\n", byte, ch, *p2);
                     93:                        } else
                     94:                                diffmsg(file1, file2, byte, line);
                     95:                                /* NOTREACHED */
                     96:                if (ch == '\n')
                     97:                        ++line;
                     98:        }
                     99:
                    100:        if (len1 != len2)
                    101:                eofmsg (len1 > len2 ? file2 : file1);
                    102:        if (dfound)
                    103:                exit(DIFF_EXIT);
                    104: }