159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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static u_char *remmap __P((u_char *, int, off_t));
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#define MMAP_CHUNK (8*1024*1024)
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#define ROUNDPAGE(i) ((i) & ~pagemask)
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void
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c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
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int fd1, fd2;
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const char *file1, *file2;
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off_t skip1, len1, skip2, len2;
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{
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u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
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off_t byte, length, line;
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int dfound;
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off_t pagemask, off1, off2;
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size_t pagesize;
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if (skip1 > len1)
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eofmsg(file1);
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len1 -= skip1;
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if (skip2 > len2)
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eofmsg(file2);
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len2 -= skip2;
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if (sflag && len1 != len2)
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exit(DIFF_EXIT);
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pagesize = getpagesize();
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pagemask = (off_t)pagesize - 1;
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off1 = ROUNDPAGE(skip1);
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off2 = ROUNDPAGE(skip2);
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length = MIN(len1, len2);
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if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
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c_special(fd1, file1, skip1, fd2, file2, skip2);
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return;
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}
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if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
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munmap(m1, MMAP_CHUNK);
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c_special(fd1, file1, skip1, fd2, file2, skip2);
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return;
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}
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dfound = 0;
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e1 = m1 + MMAP_CHUNK;
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e2 = m2 + MMAP_CHUNK;
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p1 = m1 + (skip1 - off1);
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p2 = m2 + (skip2 - off2);
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for (byte = line = 1; length--; ++byte) {
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if ((ch = *p1) != *p2) {
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if (xflag) {
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dfound = 1;
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(void)printf("%08qx %02x %02x\n", byte - 1, ch, *p2);
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} else if (lflag) {
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dfound = 1;
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(void)printf("%6qd %3o %3o\n", byte, ch, *p2);
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} else
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diffmsg(file1, file2, byte, line);
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/* NOTREACHED */
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}
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if (ch == '\n')
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++line;
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if (++p1 == e1) {
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off1 += MMAP_CHUNK;
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if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
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munmap(m2, MMAP_CHUNK);
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err(ERR_EXIT, "remmap %s", file1);
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}
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e1 = m1 + MMAP_CHUNK;
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}
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if (++p2 == e2) {
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off2 += MMAP_CHUNK;
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if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
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munmap(m1, MMAP_CHUNK);
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err(ERR_EXIT, "remmap %s", file2);
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}
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e2 = m2 + MMAP_CHUNK;
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}
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}
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munmap(m1, MMAP_CHUNK);
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munmap(m2, MMAP_CHUNK);
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if (len1 != len2)
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eofmsg (len1 > len2 ? file2 : file1);
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if (dfound)
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exit(DIFF_EXIT);
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}
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static u_char *
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remmap(mem, fd, offset)
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u_char *mem;
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int fd;
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off_t offset;
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{
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if (mem != NULL)
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munmap(mem, MMAP_CHUNK);
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mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
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if (mem == MAP_FAILED)
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return (NULL);
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madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);
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return (mem);
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}
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