1631 lines
39 KiB
C
1631 lines
39 KiB
C
/* $OpenBSD: diffreg.c,v 1.91 2016/03/01 20:57:35 natano Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (C) Caldera International Inc. 2001-2002.
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* 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 and documentation must retain the above
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* copyright 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 or owned by Caldera
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* International, Inc.
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* 4. Neither the name of Caldera International, Inc. nor the names of other
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
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* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT,
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* INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1991, 1993
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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. 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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* @(#)diffreg.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/capsicum.h>
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#include <sys/procdesc.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/wait.h>
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#include <capsicum_helpers.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <regex.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <signal.h>
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#include "diff.h"
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#include "xmalloc.h"
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#define _PATH_PR "/usr/bin/pr"
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/*
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* diff - compare two files.
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*/
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/*
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* Uses an algorithm due to Harold Stone, which finds
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* a pair of longest identical subsequences in the two
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* files.
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*
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* The major goal is to generate the match vector J.
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* J[i] is the index of the line in file1 corresponding
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* to line i file0. J[i] = 0 if there is no
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* such line in file1.
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*
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* Lines are hashed so as to work in core. All potential
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* matches are located by sorting the lines of each file
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* on the hash (called ``value''). In particular, this
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* collects the equivalence classes in file1 together.
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* Subroutine equiv replaces the value of each line in
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* file0 by the index of the first element of its
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* matching equivalence in (the reordered) file1.
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* To save space equiv squeezes file1 into a single
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* array member in which the equivalence classes
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* are simply concatenated, except that their first
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* members are flagged by changing sign.
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*
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* Next the indices that point into member are unsorted into
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* array class according to the original order of file0.
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*
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* The cleverness lies in routine stone. This marches
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* through the lines of file0, developing a vector klist
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* of "k-candidates". At step i a k-candidate is a matched
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* pair of lines x,y (x in file0 y in file1) such that
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* there is a common subsequence of length k
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* between the first i lines of file0 and the first y
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* lines of file1, but there is no such subsequence for
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* any smaller y. x is the earliest possible mate to y
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* that occurs in such a subsequence.
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*
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* Whenever any of the members of the equivalence class of
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* lines in file1 matable to a line in file0 has serial number
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* less than the y of some k-candidate, that k-candidate
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* with the smallest such y is replaced. The new
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* k-candidate is chained (via pred) to the current
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* k-1 candidate so that the actual subsequence can
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* be recovered. When a member has serial number greater
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* that the y of all k-candidates, the klist is extended.
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* At the end, the longest subsequence is pulled out
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* and placed in the array J by unravel
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*
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* With J in hand, the matches there recorded are
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* check'ed against reality to assure that no spurious
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* matches have crept in due to hashing. If they have,
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* they are broken, and "jackpot" is recorded--a harmless
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* matter except that a true match for a spuriously
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* mated line may now be unnecessarily reported as a change.
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*
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* Much of the complexity of the program comes simply
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* from trying to minimize core utilization and
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* maximize the range of doable problems by dynamically
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* allocating what is needed and reusing what is not.
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* The core requirements for problems larger than somewhat
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* are (in words) 2*length(file0) + length(file1) +
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* 3*(number of k-candidates installed), typically about
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* 6n words for files of length n.
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*/
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struct cand {
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int x;
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int y;
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int pred;
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};
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static struct line {
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int serial;
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int value;
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} *file[2];
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/*
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* The following struct is used to record change information when
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* doing a "context" or "unified" diff. (see routine "change" to
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* understand the highly mnemonic field names)
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*/
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struct context_vec {
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int a; /* start line in old file */
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int b; /* end line in old file */
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int c; /* start line in new file */
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int d; /* end line in new file */
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};
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#define diff_output printf
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static FILE *opentemp(const char *);
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static void output(char *, FILE *, char *, FILE *, int);
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static void check(FILE *, FILE *, int);
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static void range(int, int, const char *);
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static void uni_range(int, int);
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static void dump_context_vec(FILE *, FILE *, int);
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static void dump_unified_vec(FILE *, FILE *, int);
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static void prepare(int, FILE *, size_t, int);
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static void prune(void);
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static void equiv(struct line *, int, struct line *, int, int *);
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static void unravel(int);
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static void unsort(struct line *, int, int *);
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static void change(char *, FILE *, char *, FILE *, int, int, int, int, int *);
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static void sort(struct line *, int);
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static void print_header(const char *, const char *);
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static int ignoreline(char *);
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static int asciifile(FILE *);
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static int fetch(long *, int, int, FILE *, int, int, int);
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static int newcand(int, int, int);
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static int search(int *, int, int);
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static int skipline(FILE *);
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static int isqrt(int);
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static int stone(int *, int, int *, int *, int);
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static int readhash(FILE *, int);
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static int files_differ(FILE *, FILE *, int);
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static char *match_function(const long *, int, FILE *);
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static char *preadline(int, size_t, off_t);
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static int *J; /* will be overlaid on class */
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static int *class; /* will be overlaid on file[0] */
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static int *klist; /* will be overlaid on file[0] after class */
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static int *member; /* will be overlaid on file[1] */
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static int clen;
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static int inifdef; /* whether or not we are in a #ifdef block */
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static int len[2];
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static int pref, suff; /* length of prefix and suffix */
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static int slen[2];
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static int anychange;
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static long *ixnew; /* will be overlaid on file[1] */
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static long *ixold; /* will be overlaid on klist */
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static struct cand *clist; /* merely a free storage pot for candidates */
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static int clistlen; /* the length of clist */
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static struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
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static int (*chrtran)(int); /* translation table for case-folding */
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static struct context_vec *context_vec_start;
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static struct context_vec *context_vec_end;
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static struct context_vec *context_vec_ptr;
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#define FUNCTION_CONTEXT_SIZE 55
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static char lastbuf[FUNCTION_CONTEXT_SIZE];
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static int lastline;
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static int lastmatchline;
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static int
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clow2low(int c)
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{
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return (c);
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}
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static int
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cup2low(int c)
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{
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return tolower(c);
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}
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int
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diffreg(char *file1, char *file2, int flags, int capsicum)
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{
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FILE *f1, *f2;
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int i, rval;
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int ostdout = -1;
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int pr_pd, kq;
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struct kevent *e;
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cap_rights_t rights_ro;
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e = NULL;
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kq = -1;
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f1 = f2 = NULL;
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rval = D_SAME;
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anychange = 0;
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lastline = 0;
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lastmatchline = 0;
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context_vec_ptr = context_vec_start - 1;
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if (flags & D_IGNORECASE)
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chrtran = cup2low;
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else
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chrtran = clow2low;
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if (S_ISDIR(stb1.st_mode) != S_ISDIR(stb2.st_mode))
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return (S_ISDIR(stb1.st_mode) ? D_MISMATCH1 : D_MISMATCH2);
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if (strcmp(file1, "-") == 0 && strcmp(file2, "-") == 0)
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goto closem;
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if (flags & D_EMPTY1)
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f1 = fopen(_PATH_DEVNULL, "r");
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else {
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if (!S_ISREG(stb1.st_mode)) {
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if ((f1 = opentemp(file1)) == NULL ||
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fstat(fileno(f1), &stb1) < 0) {
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warn("%s", file1);
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status |= 2;
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goto closem;
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}
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} else if (strcmp(file1, "-") == 0)
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f1 = stdin;
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else
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f1 = fopen(file1, "r");
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}
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if (f1 == NULL) {
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warn("%s", file1);
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status |= 2;
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goto closem;
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}
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if (flags & D_EMPTY2)
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f2 = fopen(_PATH_DEVNULL, "r");
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else {
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if (!S_ISREG(stb2.st_mode)) {
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if ((f2 = opentemp(file2)) == NULL ||
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fstat(fileno(f2), &stb2) < 0) {
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warn("%s", file2);
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status |= 2;
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goto closem;
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}
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} else if (strcmp(file2, "-") == 0)
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f2 = stdin;
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else
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f2 = fopen(file2, "r");
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}
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if (f2 == NULL) {
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warn("%s", file2);
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status |= 2;
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goto closem;
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}
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if (lflag) {
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/* redirect stdout to pr */
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int pfd[2];
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pid_t pid;
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char *header;
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xasprintf(&header, "%s %s %s", diffargs, file1, file2);
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signal(SIGPIPE, SIG_IGN);
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fflush(stdout);
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rewind(stdout);
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pipe(pfd);
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switch ((pid = pdfork(&pr_pd, PD_CLOEXEC))) {
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case -1:
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status |= 2;
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free(header);
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err(2, "No more processes");
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case 0:
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/* child */
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if (pfd[0] != STDIN_FILENO) {
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dup2(pfd[0], STDIN_FILENO);
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close(pfd[0]);
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}
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close(pfd[1]);
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execl(_PATH_PR, _PATH_PR, "-h", header, (char *)0);
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_exit(127);
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default:
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/* parent */
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if (pfd[1] != STDOUT_FILENO) {
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ostdout = dup(STDOUT_FILENO);
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dup2(pfd[1], STDOUT_FILENO);
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close(pfd[1]);
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}
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close(pfd[0]);
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rewind(stdout);
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free(header);
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kq = kqueue();
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if (kq == -1)
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err(2, "kqueue");
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e = xmalloc(sizeof(struct kevent));
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EV_SET(e, pr_pd, EVFILT_PROCDESC, EV_ADD, NOTE_EXIT, 0,
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NULL);
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if (kevent(kq, e, 1, NULL, 0, NULL) == -1)
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err(2, "kevent");
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}
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}
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if (capsicum) {
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cap_rights_init(&rights_ro, CAP_READ, CAP_FSTAT, CAP_SEEK);
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if (cap_rights_limit(fileno(f1), &rights_ro) < 0
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&& errno != ENOSYS)
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err(2, "unable to limit rights on: %s", file1);
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if (cap_rights_limit(fileno(f2), &rights_ro) < 0 &&
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errno != ENOSYS)
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err(2, "unable to limit rights on: %s", file2);
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if (fileno(f1) == STDIN_FILENO || fileno(f2) == STDIN_FILENO) {
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/* stding has already been limited */
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if (caph_limit_stderr() == -1)
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err(2, "unable to limit stderr");
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if (caph_limit_stdout() == -1)
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err(2, "unable to limit stdout");
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} else if (caph_limit_stdio() == -1)
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err(2, "unable to limit stdio");
|
|
|
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caph_cache_catpages();
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caph_cache_tzdata();
|
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if (cap_enter() < 0 && errno != ENOSYS)
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err(2, "unable to enter capability mode");
|
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}
|
|
|
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switch (files_differ(f1, f2, flags)) {
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case 0:
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goto closem;
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case 1:
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break;
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default:
|
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/* error */
|
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status |= 2;
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goto closem;
|
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}
|
|
|
|
if ((flags & D_FORCEASCII) == 0 &&
|
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(!asciifile(f1) || !asciifile(f2))) {
|
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rval = D_BINARY;
|
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status |= 1;
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goto closem;
|
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}
|
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prepare(0, f1, stb1.st_size, flags);
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prepare(1, f2, stb2.st_size, flags);
|
|
|
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prune();
|
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sort(sfile[0], slen[0]);
|
|
sort(sfile[1], slen[1]);
|
|
|
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member = (int *)file[1];
|
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equiv(sfile[0], slen[0], sfile[1], slen[1], member);
|
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member = xreallocarray(member, slen[1] + 2, sizeof(*member));
|
|
|
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class = (int *)file[0];
|
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unsort(sfile[0], slen[0], class);
|
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class = xreallocarray(class, slen[0] + 2, sizeof(*class));
|
|
|
|
klist = xcalloc(slen[0] + 2, sizeof(*klist));
|
|
clen = 0;
|
|
clistlen = 100;
|
|
clist = xcalloc(clistlen, sizeof(*clist));
|
|
i = stone(class, slen[0], member, klist, flags);
|
|
free(member);
|
|
free(class);
|
|
|
|
J = xreallocarray(J, len[0] + 2, sizeof(*J));
|
|
unravel(klist[i]);
|
|
free(clist);
|
|
free(klist);
|
|
|
|
ixold = xreallocarray(ixold, len[0] + 2, sizeof(*ixold));
|
|
ixnew = xreallocarray(ixnew, len[1] + 2, sizeof(*ixnew));
|
|
check(f1, f2, flags);
|
|
output(file1, f1, file2, f2, flags);
|
|
if (ostdout != -1 && e != NULL) {
|
|
/* close the pipe to pr and restore stdout */
|
|
int wstatus;
|
|
|
|
fflush(stdout);
|
|
if (ostdout != STDOUT_FILENO) {
|
|
close(STDOUT_FILENO);
|
|
dup2(ostdout, STDOUT_FILENO);
|
|
close(ostdout);
|
|
}
|
|
if (kevent(kq, NULL, 0, e, 1, NULL) == -1)
|
|
err(2, "kevent");
|
|
wstatus = e[0].data;
|
|
close(kq);
|
|
if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != 0)
|
|
errx(2, "pr exited abnormally");
|
|
else if (WIFSIGNALED(wstatus))
|
|
errx(2, "pr killed by signal %d",
|
|
WTERMSIG(wstatus));
|
|
}
|
|
|
|
closem:
|
|
if (anychange) {
|
|
status |= 1;
|
|
if (rval == D_SAME)
|
|
rval = D_DIFFER;
|
|
}
|
|
if (f1 != NULL)
|
|
fclose(f1);
|
|
if (f2 != NULL)
|
|
fclose(f2);
|
|
|
|
return (rval);
|
|
}
|
|
|
|
/*
|
|
* Check to see if the given files differ.
|
|
* Returns 0 if they are the same, 1 if different, and -1 on error.
|
|
* XXX - could use code from cmp(1) [faster]
|
|
*/
|
|
static int
|
|
files_differ(FILE *f1, FILE *f2, int flags)
|
|
{
|
|
char buf1[BUFSIZ], buf2[BUFSIZ];
|
|
size_t i, j;
|
|
|
|
if ((flags & (D_EMPTY1|D_EMPTY2)) || stb1.st_size != stb2.st_size ||
|
|
(stb1.st_mode & S_IFMT) != (stb2.st_mode & S_IFMT))
|
|
return (1);
|
|
for (;;) {
|
|
i = fread(buf1, 1, sizeof(buf1), f1);
|
|
j = fread(buf2, 1, sizeof(buf2), f2);
|
|
if ((!i && ferror(f1)) || (!j && ferror(f2)))
|
|
return (-1);
|
|
if (i != j)
|
|
return (1);
|
|
if (i == 0)
|
|
return (0);
|
|
if (memcmp(buf1, buf2, i) != 0)
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
static FILE *
|
|
opentemp(const char *f)
|
|
{
|
|
char buf[BUFSIZ], tempfile[PATH_MAX];
|
|
ssize_t nread;
|
|
int ifd, ofd;
|
|
|
|
if (strcmp(f, "-") == 0)
|
|
ifd = STDIN_FILENO;
|
|
else if ((ifd = open(f, O_RDONLY, 0644)) < 0)
|
|
return (NULL);
|
|
|
|
(void)strlcpy(tempfile, _PATH_TMP "/diff.XXXXXXXX", sizeof(tempfile));
|
|
|
|
if ((ofd = mkstemp(tempfile)) < 0) {
|
|
close(ifd);
|
|
return (NULL);
|
|
}
|
|
unlink(tempfile);
|
|
while ((nread = read(ifd, buf, BUFSIZ)) > 0) {
|
|
if (write(ofd, buf, nread) != nread) {
|
|
close(ifd);
|
|
close(ofd);
|
|
return (NULL);
|
|
}
|
|
}
|
|
close(ifd);
|
|
lseek(ofd, (off_t)0, SEEK_SET);
|
|
return (fdopen(ofd, "r"));
|
|
}
|
|
|
|
char *
|
|
splice(char *dir, char *path)
|
|
{
|
|
char *tail, *buf;
|
|
size_t dirlen;
|
|
|
|
dirlen = strlen(dir);
|
|
while (dirlen != 0 && dir[dirlen - 1] == '/')
|
|
dirlen--;
|
|
if ((tail = strrchr(path, '/')) == NULL)
|
|
tail = path;
|
|
else
|
|
tail++;
|
|
xasprintf(&buf, "%.*s/%s", (int)dirlen, dir, tail);
|
|
return (buf);
|
|
}
|
|
|
|
static void
|
|
prepare(int i, FILE *fd, size_t filesize, int flags)
|
|
{
|
|
struct line *p;
|
|
int h;
|
|
size_t sz, j;
|
|
|
|
rewind(fd);
|
|
|
|
sz = MIN(filesize, SIZE_MAX) / 25;
|
|
if (sz < 100)
|
|
sz = 100;
|
|
|
|
p = xcalloc(sz + 3, sizeof(*p));
|
|
for (j = 0; (h = readhash(fd, flags));) {
|
|
if (j == sz) {
|
|
sz = sz * 3 / 2;
|
|
p = xreallocarray(p, sz + 3, sizeof(*p));
|
|
}
|
|
p[++j].value = h;
|
|
}
|
|
len[i] = j;
|
|
file[i] = p;
|
|
}
|
|
|
|
static void
|
|
prune(void)
|
|
{
|
|
int i, j;
|
|
|
|
for (pref = 0; pref < len[0] && pref < len[1] &&
|
|
file[0][pref + 1].value == file[1][pref + 1].value;
|
|
pref++)
|
|
;
|
|
for (suff = 0; suff < len[0] - pref && suff < len[1] - pref &&
|
|
file[0][len[0] - suff].value == file[1][len[1] - suff].value;
|
|
suff++)
|
|
;
|
|
for (j = 0; j < 2; j++) {
|
|
sfile[j] = file[j] + pref;
|
|
slen[j] = len[j] - pref - suff;
|
|
for (i = 0; i <= slen[j]; i++)
|
|
sfile[j][i].serial = i;
|
|
}
|
|
}
|
|
|
|
static void
|
|
equiv(struct line *a, int n, struct line *b, int m, int *c)
|
|
{
|
|
int i, j;
|
|
|
|
i = j = 1;
|
|
while (i <= n && j <= m) {
|
|
if (a[i].value < b[j].value)
|
|
a[i++].value = 0;
|
|
else if (a[i].value == b[j].value)
|
|
a[i++].value = j;
|
|
else
|
|
j++;
|
|
}
|
|
while (i <= n)
|
|
a[i++].value = 0;
|
|
b[m + 1].value = 0;
|
|
j = 0;
|
|
while (++j <= m) {
|
|
c[j] = -b[j].serial;
|
|
while (b[j + 1].value == b[j].value) {
|
|
j++;
|
|
c[j] = b[j].serial;
|
|
}
|
|
}
|
|
c[j] = -1;
|
|
}
|
|
|
|
/* Code taken from ping.c */
|
|
static int
|
|
isqrt(int n)
|
|
{
|
|
int y, x = 1;
|
|
|
|
if (n == 0)
|
|
return (0);
|
|
|
|
do { /* newton was a stinker */
|
|
y = x;
|
|
x = n / x;
|
|
x += y;
|
|
x /= 2;
|
|
} while ((x - y) > 1 || (x - y) < -1);
|
|
|
|
return (x);
|
|
}
|
|
|
|
static int
|
|
stone(int *a, int n, int *b, int *c, int flags)
|
|
{
|
|
int i, k, y, j, l;
|
|
int oldc, tc, oldl, sq;
|
|
u_int numtries, bound;
|
|
|
|
if (flags & D_MINIMAL)
|
|
bound = UINT_MAX;
|
|
else {
|
|
sq = isqrt(n);
|
|
bound = MAX(256, sq);
|
|
}
|
|
|
|
k = 0;
|
|
c[0] = newcand(0, 0, 0);
|
|
for (i = 1; i <= n; i++) {
|
|
j = a[i];
|
|
if (j == 0)
|
|
continue;
|
|
y = -b[j];
|
|
oldl = 0;
|
|
oldc = c[0];
|
|
numtries = 0;
|
|
do {
|
|
if (y <= clist[oldc].y)
|
|
continue;
|
|
l = search(c, k, y);
|
|
if (l != oldl + 1)
|
|
oldc = c[l - 1];
|
|
if (l <= k) {
|
|
if (clist[c[l]].y <= y)
|
|
continue;
|
|
tc = c[l];
|
|
c[l] = newcand(i, y, oldc);
|
|
oldc = tc;
|
|
oldl = l;
|
|
numtries++;
|
|
} else {
|
|
c[l] = newcand(i, y, oldc);
|
|
k++;
|
|
break;
|
|
}
|
|
} while ((y = b[++j]) > 0 && numtries < bound);
|
|
}
|
|
return (k);
|
|
}
|
|
|
|
static int
|
|
newcand(int x, int y, int pred)
|
|
{
|
|
struct cand *q;
|
|
|
|
if (clen == clistlen) {
|
|
clistlen = clistlen * 11 / 10;
|
|
clist = xreallocarray(clist, clistlen, sizeof(*clist));
|
|
}
|
|
q = clist + clen;
|
|
q->x = x;
|
|
q->y = y;
|
|
q->pred = pred;
|
|
return (clen++);
|
|
}
|
|
|
|
static int
|
|
search(int *c, int k, int y)
|
|
{
|
|
int i, j, l, t;
|
|
|
|
if (clist[c[k]].y < y) /* quick look for typical case */
|
|
return (k + 1);
|
|
i = 0;
|
|
j = k + 1;
|
|
for (;;) {
|
|
l = (i + j) / 2;
|
|
if (l <= i)
|
|
break;
|
|
t = clist[c[l]].y;
|
|
if (t > y)
|
|
j = l;
|
|
else if (t < y)
|
|
i = l;
|
|
else
|
|
return (l);
|
|
}
|
|
return (l + 1);
|
|
}
|
|
|
|
static void
|
|
unravel(int p)
|
|
{
|
|
struct cand *q;
|
|
int i;
|
|
|
|
for (i = 0; i <= len[0]; i++)
|
|
J[i] = i <= pref ? i :
|
|
i > len[0] - suff ? i + len[1] - len[0] : 0;
|
|
for (q = clist + p; q->y != 0; q = clist + q->pred)
|
|
J[q->x + pref] = q->y + pref;
|
|
}
|
|
|
|
/*
|
|
* Check does double duty:
|
|
* 1. ferret out any fortuitous correspondences due
|
|
* to confounding by hashing (which result in "jackpot")
|
|
* 2. collect random access indexes to the two files
|
|
*/
|
|
static void
|
|
check(FILE *f1, FILE *f2, int flags)
|
|
{
|
|
int i, j, jackpot, c, d;
|
|
long ctold, ctnew;
|
|
|
|
rewind(f1);
|
|
rewind(f2);
|
|
j = 1;
|
|
ixold[0] = ixnew[0] = 0;
|
|
jackpot = 0;
|
|
ctold = ctnew = 0;
|
|
for (i = 1; i <= len[0]; i++) {
|
|
if (J[i] == 0) {
|
|
ixold[i] = ctold += skipline(f1);
|
|
continue;
|
|
}
|
|
while (j < J[i]) {
|
|
ixnew[j] = ctnew += skipline(f2);
|
|
j++;
|
|
}
|
|
if (flags & (D_FOLDBLANKS|D_IGNOREBLANKS|D_IGNORECASE|D_STRIPCR)) {
|
|
for (;;) {
|
|
c = getc(f1);
|
|
d = getc(f2);
|
|
/*
|
|
* GNU diff ignores a missing newline
|
|
* in one file for -b or -w.
|
|
*/
|
|
if (flags & (D_FOLDBLANKS|D_IGNOREBLANKS)) {
|
|
if (c == EOF && d == '\n') {
|
|
ctnew++;
|
|
break;
|
|
} else if (c == '\n' && d == EOF) {
|
|
ctold++;
|
|
break;
|
|
}
|
|
}
|
|
ctold++;
|
|
ctnew++;
|
|
if (flags & D_STRIPCR) {
|
|
if (c == '\r') {
|
|
if ((c = getc(f1)) == '\n') {
|
|
ctnew++;
|
|
break;
|
|
}
|
|
}
|
|
if (d == '\r') {
|
|
if ((d = getc(f2)) == '\n') {
|
|
ctold++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if ((flags & D_FOLDBLANKS) && isspace(c) &&
|
|
isspace(d)) {
|
|
do {
|
|
if (c == '\n')
|
|
break;
|
|
ctold++;
|
|
} while (isspace(c = getc(f1)));
|
|
do {
|
|
if (d == '\n')
|
|
break;
|
|
ctnew++;
|
|
} while (isspace(d = getc(f2)));
|
|
} else if ((flags & D_IGNOREBLANKS)) {
|
|
while (isspace(c) && c != '\n') {
|
|
c = getc(f1);
|
|
ctold++;
|
|
}
|
|
while (isspace(d) && d != '\n') {
|
|
d = getc(f2);
|
|
ctnew++;
|
|
}
|
|
}
|
|
if (chrtran(c) != chrtran(d)) {
|
|
jackpot++;
|
|
J[i] = 0;
|
|
if (c != '\n' && c != EOF)
|
|
ctold += skipline(f1);
|
|
if (d != '\n' && c != EOF)
|
|
ctnew += skipline(f2);
|
|
break;
|
|
}
|
|
if (c == '\n' || c == EOF)
|
|
break;
|
|
}
|
|
} else {
|
|
for (;;) {
|
|
ctold++;
|
|
ctnew++;
|
|
if ((c = getc(f1)) != (d = getc(f2))) {
|
|
/* jackpot++; */
|
|
J[i] = 0;
|
|
if (c != '\n' && c != EOF)
|
|
ctold += skipline(f1);
|
|
if (d != '\n' && c != EOF)
|
|
ctnew += skipline(f2);
|
|
break;
|
|
}
|
|
if (c == '\n' || c == EOF)
|
|
break;
|
|
}
|
|
}
|
|
ixold[i] = ctold;
|
|
ixnew[j] = ctnew;
|
|
j++;
|
|
}
|
|
for (; j <= len[1]; j++) {
|
|
ixnew[j] = ctnew += skipline(f2);
|
|
}
|
|
/*
|
|
* if (jackpot)
|
|
* fprintf(stderr, "jackpot\n");
|
|
*/
|
|
}
|
|
|
|
/* shellsort CACM #201 */
|
|
static void
|
|
sort(struct line *a, int n)
|
|
{
|
|
struct line *ai, *aim, w;
|
|
int j, m = 0, k;
|
|
|
|
if (n == 0)
|
|
return;
|
|
for (j = 1; j <= n; j *= 2)
|
|
m = 2 * j - 1;
|
|
for (m /= 2; m != 0; m /= 2) {
|
|
k = n - m;
|
|
for (j = 1; j <= k; j++) {
|
|
for (ai = &a[j]; ai > a; ai -= m) {
|
|
aim = &ai[m];
|
|
if (aim < ai)
|
|
break; /* wraparound */
|
|
if (aim->value > ai[0].value ||
|
|
(aim->value == ai[0].value &&
|
|
aim->serial > ai[0].serial))
|
|
break;
|
|
w.value = ai[0].value;
|
|
ai[0].value = aim->value;
|
|
aim->value = w.value;
|
|
w.serial = ai[0].serial;
|
|
ai[0].serial = aim->serial;
|
|
aim->serial = w.serial;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
unsort(struct line *f, int l, int *b)
|
|
{
|
|
int *a, i;
|
|
|
|
a = xcalloc(l + 1, sizeof(*a));
|
|
for (i = 1; i <= l; i++)
|
|
a[f[i].serial] = f[i].value;
|
|
for (i = 1; i <= l; i++)
|
|
b[i] = a[i];
|
|
free(a);
|
|
}
|
|
|
|
static int
|
|
skipline(FILE *f)
|
|
{
|
|
int i, c;
|
|
|
|
for (i = 1; (c = getc(f)) != '\n' && c != EOF; i++)
|
|
continue;
|
|
return (i);
|
|
}
|
|
|
|
static void
|
|
output(char *file1, FILE *f1, char *file2, FILE *f2, int flags)
|
|
{
|
|
int m, i0, i1, j0, j1;
|
|
|
|
rewind(f1);
|
|
rewind(f2);
|
|
m = len[0];
|
|
J[0] = 0;
|
|
J[m + 1] = len[1] + 1;
|
|
if (diff_format != D_EDIT) {
|
|
for (i0 = 1; i0 <= m; i0 = i1 + 1) {
|
|
while (i0 <= m && J[i0] == J[i0 - 1] + 1)
|
|
i0++;
|
|
j0 = J[i0 - 1] + 1;
|
|
i1 = i0 - 1;
|
|
while (i1 < m && J[i1 + 1] == 0)
|
|
i1++;
|
|
j1 = J[i1 + 1] - 1;
|
|
J[i1] = j1;
|
|
change(file1, f1, file2, f2, i0, i1, j0, j1, &flags);
|
|
}
|
|
} else {
|
|
for (i0 = m; i0 >= 1; i0 = i1 - 1) {
|
|
while (i0 >= 1 && J[i0] == J[i0 + 1] - 1 && J[i0] != 0)
|
|
i0--;
|
|
j0 = J[i0 + 1] - 1;
|
|
i1 = i0 + 1;
|
|
while (i1 > 1 && J[i1 - 1] == 0)
|
|
i1--;
|
|
j1 = J[i1 - 1] + 1;
|
|
J[i1] = j1;
|
|
change(file1, f1, file2, f2, i1, i0, j1, j0, &flags);
|
|
}
|
|
}
|
|
if (m == 0)
|
|
change(file1, f1, file2, f2, 1, 0, 1, len[1], &flags);
|
|
if (diff_format == D_IFDEF || diff_format == D_GFORMAT) {
|
|
for (;;) {
|
|
#define c i0
|
|
if ((c = getc(f1)) == EOF)
|
|
return;
|
|
diff_output("%c", c);
|
|
}
|
|
#undef c
|
|
}
|
|
if (anychange != 0) {
|
|
if (diff_format == D_CONTEXT)
|
|
dump_context_vec(f1, f2, flags);
|
|
else if (diff_format == D_UNIFIED)
|
|
dump_unified_vec(f1, f2, flags);
|
|
}
|
|
}
|
|
|
|
static void
|
|
range(int a, int b, const char *separator)
|
|
{
|
|
diff_output("%d", a > b ? b : a);
|
|
if (a < b)
|
|
diff_output("%s%d", separator, b);
|
|
}
|
|
|
|
static void
|
|
uni_range(int a, int b)
|
|
{
|
|
if (a < b)
|
|
diff_output("%d,%d", a, b - a + 1);
|
|
else if (a == b)
|
|
diff_output("%d", b);
|
|
else
|
|
diff_output("%d,0", b);
|
|
}
|
|
|
|
static char *
|
|
preadline(int fd, size_t rlen, off_t off)
|
|
{
|
|
char *line;
|
|
ssize_t nr;
|
|
|
|
line = xmalloc(rlen + 1);
|
|
if ((nr = pread(fd, line, rlen, off)) < 0)
|
|
err(2, "preadline");
|
|
if (nr > 0 && line[nr-1] == '\n')
|
|
nr--;
|
|
line[nr] = '\0';
|
|
return (line);
|
|
}
|
|
|
|
static int
|
|
ignoreline(char *line)
|
|
{
|
|
int ret;
|
|
|
|
ret = regexec(&ignore_re, line, 0, NULL, 0);
|
|
free(line);
|
|
return (ret == 0); /* if it matched, it should be ignored. */
|
|
}
|
|
|
|
/*
|
|
* Indicate that there is a difference between lines a and b of the from file
|
|
* to get to lines c to d of the to file. If a is greater then b then there
|
|
* are no lines in the from file involved and this means that there were
|
|
* lines appended (beginning at b). If c is greater than d then there are
|
|
* lines missing from the to file.
|
|
*/
|
|
static void
|
|
change(char *file1, FILE *f1, char *file2, FILE *f2, int a, int b, int c, int d,
|
|
int *pflags)
|
|
{
|
|
static size_t max_context = 64;
|
|
long curpos;
|
|
int i, nc, f;
|
|
const char *walk;
|
|
|
|
restart:
|
|
if ((diff_format != D_IFDEF || diff_format == D_GFORMAT) &&
|
|
a > b && c > d)
|
|
return;
|
|
if (ignore_pats != NULL) {
|
|
char *line;
|
|
/*
|
|
* All lines in the change, insert, or delete must
|
|
* match an ignore pattern for the change to be
|
|
* ignored.
|
|
*/
|
|
if (a <= b) { /* Changes and deletes. */
|
|
for (i = a; i <= b; i++) {
|
|
line = preadline(fileno(f1),
|
|
ixold[i] - ixold[i - 1], ixold[i - 1]);
|
|
if (!ignoreline(line))
|
|
goto proceed;
|
|
}
|
|
}
|
|
if (a > b || c <= d) { /* Changes and inserts. */
|
|
for (i = c; i <= d; i++) {
|
|
line = preadline(fileno(f2),
|
|
ixnew[i] - ixnew[i - 1], ixnew[i - 1]);
|
|
if (!ignoreline(line))
|
|
goto proceed;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
proceed:
|
|
if (*pflags & D_HEADER && diff_format != D_BRIEF) {
|
|
diff_output("%s %s %s\n", diffargs, file1, file2);
|
|
*pflags &= ~D_HEADER;
|
|
}
|
|
if (diff_format == D_CONTEXT || diff_format == D_UNIFIED) {
|
|
/*
|
|
* Allocate change records as needed.
|
|
*/
|
|
if (context_vec_ptr == context_vec_end - 1) {
|
|
ptrdiff_t offset = context_vec_ptr - context_vec_start;
|
|
max_context <<= 1;
|
|
context_vec_start = xreallocarray(context_vec_start,
|
|
max_context, sizeof(*context_vec_start));
|
|
context_vec_end = context_vec_start + max_context;
|
|
context_vec_ptr = context_vec_start + offset;
|
|
}
|
|
if (anychange == 0) {
|
|
/*
|
|
* Print the context/unidiff header first time through.
|
|
*/
|
|
print_header(file1, file2);
|
|
anychange = 1;
|
|
} else if (a > context_vec_ptr->b + (2 * diff_context) + 1 &&
|
|
c > context_vec_ptr->d + (2 * diff_context) + 1) {
|
|
/*
|
|
* If this change is more than 'diff_context' lines from the
|
|
* previous change, dump the record and reset it.
|
|
*/
|
|
if (diff_format == D_CONTEXT)
|
|
dump_context_vec(f1, f2, *pflags);
|
|
else
|
|
dump_unified_vec(f1, f2, *pflags);
|
|
}
|
|
context_vec_ptr++;
|
|
context_vec_ptr->a = a;
|
|
context_vec_ptr->b = b;
|
|
context_vec_ptr->c = c;
|
|
context_vec_ptr->d = d;
|
|
return;
|
|
}
|
|
if (anychange == 0)
|
|
anychange = 1;
|
|
switch (diff_format) {
|
|
case D_BRIEF:
|
|
return;
|
|
case D_NORMAL:
|
|
case D_EDIT:
|
|
range(a, b, ",");
|
|
diff_output("%c", a > b ? 'a' : c > d ? 'd' : 'c');
|
|
if (diff_format == D_NORMAL)
|
|
range(c, d, ",");
|
|
diff_output("\n");
|
|
break;
|
|
case D_REVERSE:
|
|
diff_output("%c", a > b ? 'a' : c > d ? 'd' : 'c');
|
|
range(a, b, " ");
|
|
diff_output("\n");
|
|
break;
|
|
case D_NREVERSE:
|
|
if (a > b)
|
|
diff_output("a%d %d\n", b, d - c + 1);
|
|
else {
|
|
diff_output("d%d %d\n", a, b - a + 1);
|
|
if (!(c > d))
|
|
/* add changed lines */
|
|
diff_output("a%d %d\n", b, d - c + 1);
|
|
}
|
|
break;
|
|
}
|
|
if (diff_format == D_GFORMAT) {
|
|
curpos = ftell(f1);
|
|
/* print through if append (a>b), else to (nb: 0 vs 1 orig) */
|
|
nc = ixold[a > b ? b : a - 1] - curpos;
|
|
for (i = 0; i < nc; i++)
|
|
diff_output("%c", getc(f1));
|
|
for (walk = group_format; *walk != '\0'; walk++) {
|
|
if (*walk == '%') {
|
|
walk++;
|
|
switch (*walk) {
|
|
case '<':
|
|
fetch(ixold, a, b, f1, '<', 1, *pflags);
|
|
break;
|
|
case '>':
|
|
fetch(ixnew, c, d, f2, '>', 0, *pflags);
|
|
break;
|
|
default:
|
|
diff_output("%%%c", *walk);
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
diff_output("%c", *walk);
|
|
}
|
|
}
|
|
if (diff_format == D_NORMAL || diff_format == D_IFDEF) {
|
|
fetch(ixold, a, b, f1, '<', 1, *pflags);
|
|
if (a <= b && c <= d && diff_format == D_NORMAL)
|
|
diff_output("---\n");
|
|
}
|
|
f = 0;
|
|
if (diff_format != D_GFORMAT)
|
|
f = fetch(ixnew, c, d, f2, diff_format == D_NORMAL ? '>' : '\0', 0, *pflags);
|
|
if (f != 0 && diff_format == D_EDIT) {
|
|
/*
|
|
* A non-zero return value for D_EDIT indicates that the
|
|
* last line printed was a bare dot (".") that has been
|
|
* escaped as ".." to prevent ed(1) from misinterpreting
|
|
* it. We have to add a substitute command to change this
|
|
* back and restart where we left off.
|
|
*/
|
|
diff_output(".\n");
|
|
diff_output("%ds/.//\n", a + f - 1);
|
|
b = a + f - 1;
|
|
a = b + 1;
|
|
c += f;
|
|
goto restart;
|
|
}
|
|
if ((diff_format == D_EDIT || diff_format == D_REVERSE) && c <= d)
|
|
diff_output(".\n");
|
|
if (inifdef) {
|
|
diff_output("#endif /* %s */\n", ifdefname);
|
|
inifdef = 0;
|
|
}
|
|
}
|
|
|
|
static int
|
|
fetch(long *f, int a, int b, FILE *lb, int ch, int oldfile, int flags)
|
|
{
|
|
int i, j, c, lastc, col, nc;
|
|
int newcol;
|
|
|
|
/*
|
|
* When doing #ifdef's, copy down to current line
|
|
* if this is the first file, so that stuff makes it to output.
|
|
*/
|
|
if ((diff_format == D_IFDEF) && oldfile) {
|
|
long curpos = ftell(lb);
|
|
/* print through if append (a>b), else to (nb: 0 vs 1 orig) */
|
|
nc = f[a > b ? b : a - 1] - curpos;
|
|
for (i = 0; i < nc; i++)
|
|
diff_output("%c", getc(lb));
|
|
}
|
|
if (a > b)
|
|
return (0);
|
|
if (diff_format == D_IFDEF) {
|
|
if (inifdef) {
|
|
diff_output("#else /* %s%s */\n",
|
|
oldfile == 1 ? "!" : "", ifdefname);
|
|
} else {
|
|
if (oldfile)
|
|
diff_output("#ifndef %s\n", ifdefname);
|
|
else
|
|
diff_output("#ifdef %s\n", ifdefname);
|
|
}
|
|
inifdef = 1 + oldfile;
|
|
}
|
|
for (i = a; i <= b; i++) {
|
|
fseek(lb, f[i - 1], SEEK_SET);
|
|
nc = f[i] - f[i - 1];
|
|
if ((diff_format != D_IFDEF && diff_format != D_GFORMAT) &&
|
|
ch != '\0') {
|
|
diff_output("%c", ch);
|
|
if (Tflag && (diff_format == D_NORMAL || diff_format == D_CONTEXT
|
|
|| diff_format == D_UNIFIED))
|
|
diff_output("\t");
|
|
else if (diff_format != D_UNIFIED)
|
|
diff_output(" ");
|
|
}
|
|
col = 0;
|
|
for (j = 0, lastc = '\0'; j < nc; j++, lastc = c) {
|
|
if ((c = getc(lb)) == EOF) {
|
|
if (diff_format == D_EDIT || diff_format == D_REVERSE ||
|
|
diff_format == D_NREVERSE)
|
|
warnx("No newline at end of file");
|
|
else
|
|
diff_output("\n\\ No newline at end of "
|
|
"file\n");
|
|
return (0);
|
|
}
|
|
if (c == '\t' && (flags & D_EXPANDTABS)) {
|
|
newcol = ((col/tabsize)+1)*tabsize;
|
|
do {
|
|
diff_output(" ");
|
|
} while (++col < newcol);
|
|
} else {
|
|
if (diff_format == D_EDIT && j == 1 && c == '\n'
|
|
&& lastc == '.') {
|
|
/*
|
|
* Don't print a bare "." line
|
|
* since that will confuse ed(1).
|
|
* Print ".." instead and return,
|
|
* giving the caller an offset
|
|
* from which to restart.
|
|
*/
|
|
diff_output(".\n");
|
|
return (i - a + 1);
|
|
}
|
|
diff_output("%c", c);
|
|
col++;
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
|
|
*/
|
|
static int
|
|
readhash(FILE *f, int flags)
|
|
{
|
|
int i, t, space;
|
|
int sum;
|
|
|
|
sum = 1;
|
|
space = 0;
|
|
if ((flags & (D_FOLDBLANKS|D_IGNOREBLANKS)) == 0) {
|
|
if (flags & D_IGNORECASE)
|
|
for (i = 0; (t = getc(f)) != '\n'; i++) {
|
|
if (flags & D_STRIPCR && t == '\r') {
|
|
t = getc(f);
|
|
if (t == '\n')
|
|
break;
|
|
ungetc(t, f);
|
|
}
|
|
if (t == EOF) {
|
|
if (i == 0)
|
|
return (0);
|
|
break;
|
|
}
|
|
sum = sum * 127 + chrtran(t);
|
|
}
|
|
else
|
|
for (i = 0; (t = getc(f)) != '\n'; i++) {
|
|
if (flags & D_STRIPCR && t == '\r') {
|
|
t = getc(f);
|
|
if (t == '\n')
|
|
break;
|
|
ungetc(t, f);
|
|
}
|
|
if (t == EOF) {
|
|
if (i == 0)
|
|
return (0);
|
|
break;
|
|
}
|
|
sum = sum * 127 + t;
|
|
}
|
|
} else {
|
|
for (i = 0;;) {
|
|
switch (t = getc(f)) {
|
|
case '\r':
|
|
case '\t':
|
|
case '\v':
|
|
case '\f':
|
|
case ' ':
|
|
space++;
|
|
continue;
|
|
default:
|
|
if (space && (flags & D_IGNOREBLANKS) == 0) {
|
|
i++;
|
|
space = 0;
|
|
}
|
|
sum = sum * 127 + chrtran(t);
|
|
i++;
|
|
continue;
|
|
case EOF:
|
|
if (i == 0)
|
|
return (0);
|
|
/* FALLTHROUGH */
|
|
case '\n':
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* There is a remote possibility that we end up with a zero sum.
|
|
* Zero is used as an EOF marker, so return 1 instead.
|
|
*/
|
|
return (sum == 0 ? 1 : sum);
|
|
}
|
|
|
|
static int
|
|
asciifile(FILE *f)
|
|
{
|
|
unsigned char buf[BUFSIZ];
|
|
size_t cnt;
|
|
|
|
if (f == NULL)
|
|
return (1);
|
|
|
|
rewind(f);
|
|
cnt = fread(buf, 1, sizeof(buf), f);
|
|
return (memchr(buf, '\0', cnt) == NULL);
|
|
}
|
|
|
|
#define begins_with(s, pre) (strncmp(s, pre, sizeof(pre)-1) == 0)
|
|
|
|
static char *
|
|
match_function(const long *f, int pos, FILE *fp)
|
|
{
|
|
unsigned char buf[FUNCTION_CONTEXT_SIZE];
|
|
size_t nc;
|
|
int last = lastline;
|
|
const char *state = NULL;
|
|
|
|
lastline = pos;
|
|
while (pos > last) {
|
|
fseek(fp, f[pos - 1], SEEK_SET);
|
|
nc = f[pos] - f[pos - 1];
|
|
if (nc >= sizeof(buf))
|
|
nc = sizeof(buf) - 1;
|
|
nc = fread(buf, 1, nc, fp);
|
|
if (nc > 0) {
|
|
buf[nc] = '\0';
|
|
buf[strcspn(buf, "\n")] = '\0';
|
|
if (isalpha(buf[0]) || buf[0] == '_' || buf[0] == '$') {
|
|
if (begins_with(buf, "private:")) {
|
|
if (!state)
|
|
state = " (private)";
|
|
} else if (begins_with(buf, "protected:")) {
|
|
if (!state)
|
|
state = " (protected)";
|
|
} else if (begins_with(buf, "public:")) {
|
|
if (!state)
|
|
state = " (public)";
|
|
} else {
|
|
strlcpy(lastbuf, buf, sizeof lastbuf);
|
|
if (state)
|
|
strlcat(lastbuf, state,
|
|
sizeof lastbuf);
|
|
lastmatchline = pos;
|
|
return lastbuf;
|
|
}
|
|
}
|
|
}
|
|
pos--;
|
|
}
|
|
return lastmatchline > 0 ? lastbuf : NULL;
|
|
}
|
|
|
|
/* dump accumulated "context" diff changes */
|
|
static void
|
|
dump_context_vec(FILE *f1, FILE *f2, int flags)
|
|
{
|
|
struct context_vec *cvp = context_vec_start;
|
|
int lowa, upb, lowc, upd, do_output;
|
|
int a, b, c, d;
|
|
char ch, *f;
|
|
|
|
if (context_vec_start > context_vec_ptr)
|
|
return;
|
|
|
|
b = d = 0; /* gcc */
|
|
lowa = MAX(1, cvp->a - diff_context);
|
|
upb = MIN(len[0], context_vec_ptr->b + diff_context);
|
|
lowc = MAX(1, cvp->c - diff_context);
|
|
upd = MIN(len[1], context_vec_ptr->d + diff_context);
|
|
|
|
diff_output("***************");
|
|
if ((flags & D_PROTOTYPE)) {
|
|
f = match_function(ixold, lowa-1, f1);
|
|
if (f != NULL)
|
|
diff_output(" %s", f);
|
|
}
|
|
diff_output("\n*** ");
|
|
range(lowa, upb, ",");
|
|
diff_output(" ****\n");
|
|
|
|
/*
|
|
* Output changes to the "old" file. The first loop suppresses
|
|
* output if there were no changes to the "old" file (we'll see
|
|
* the "old" lines as context in the "new" list).
|
|
*/
|
|
do_output = 0;
|
|
for (; cvp <= context_vec_ptr; cvp++)
|
|
if (cvp->a <= cvp->b) {
|
|
cvp = context_vec_start;
|
|
do_output++;
|
|
break;
|
|
}
|
|
if (do_output) {
|
|
while (cvp <= context_vec_ptr) {
|
|
a = cvp->a;
|
|
b = cvp->b;
|
|
c = cvp->c;
|
|
d = cvp->d;
|
|
|
|
if (a <= b && c <= d)
|
|
ch = 'c';
|
|
else
|
|
ch = (a <= b) ? 'd' : 'a';
|
|
|
|
if (ch == 'a')
|
|
fetch(ixold, lowa, b, f1, ' ', 0, flags);
|
|
else {
|
|
fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
|
|
fetch(ixold, a, b, f1,
|
|
ch == 'c' ? '!' : '-', 0, flags);
|
|
}
|
|
lowa = b + 1;
|
|
cvp++;
|
|
}
|
|
fetch(ixold, b + 1, upb, f1, ' ', 0, flags);
|
|
}
|
|
/* output changes to the "new" file */
|
|
diff_output("--- ");
|
|
range(lowc, upd, ",");
|
|
diff_output(" ----\n");
|
|
|
|
do_output = 0;
|
|
for (cvp = context_vec_start; cvp <= context_vec_ptr; cvp++)
|
|
if (cvp->c <= cvp->d) {
|
|
cvp = context_vec_start;
|
|
do_output++;
|
|
break;
|
|
}
|
|
if (do_output) {
|
|
while (cvp <= context_vec_ptr) {
|
|
a = cvp->a;
|
|
b = cvp->b;
|
|
c = cvp->c;
|
|
d = cvp->d;
|
|
|
|
if (a <= b && c <= d)
|
|
ch = 'c';
|
|
else
|
|
ch = (a <= b) ? 'd' : 'a';
|
|
|
|
if (ch == 'd')
|
|
fetch(ixnew, lowc, d, f2, ' ', 0, flags);
|
|
else {
|
|
fetch(ixnew, lowc, c - 1, f2, ' ', 0, flags);
|
|
fetch(ixnew, c, d, f2,
|
|
ch == 'c' ? '!' : '+', 0, flags);
|
|
}
|
|
lowc = d + 1;
|
|
cvp++;
|
|
}
|
|
fetch(ixnew, d + 1, upd, f2, ' ', 0, flags);
|
|
}
|
|
context_vec_ptr = context_vec_start - 1;
|
|
}
|
|
|
|
/* dump accumulated "unified" diff changes */
|
|
static void
|
|
dump_unified_vec(FILE *f1, FILE *f2, int flags)
|
|
{
|
|
struct context_vec *cvp = context_vec_start;
|
|
int lowa, upb, lowc, upd;
|
|
int a, b, c, d;
|
|
char ch, *f;
|
|
|
|
if (context_vec_start > context_vec_ptr)
|
|
return;
|
|
|
|
b = d = 0; /* gcc */
|
|
lowa = MAX(1, cvp->a - diff_context);
|
|
upb = MIN(len[0], context_vec_ptr->b + diff_context);
|
|
lowc = MAX(1, cvp->c - diff_context);
|
|
upd = MIN(len[1], context_vec_ptr->d + diff_context);
|
|
|
|
diff_output("@@ -");
|
|
uni_range(lowa, upb);
|
|
diff_output(" +");
|
|
uni_range(lowc, upd);
|
|
diff_output(" @@");
|
|
if ((flags & D_PROTOTYPE)) {
|
|
f = match_function(ixold, lowa-1, f1);
|
|
if (f != NULL)
|
|
diff_output(" %s", f);
|
|
}
|
|
diff_output("\n");
|
|
|
|
/*
|
|
* Output changes in "unified" diff format--the old and new lines
|
|
* are printed together.
|
|
*/
|
|
for (; cvp <= context_vec_ptr; cvp++) {
|
|
a = cvp->a;
|
|
b = cvp->b;
|
|
c = cvp->c;
|
|
d = cvp->d;
|
|
|
|
/*
|
|
* c: both new and old changes
|
|
* d: only changes in the old file
|
|
* a: only changes in the new file
|
|
*/
|
|
if (a <= b && c <= d)
|
|
ch = 'c';
|
|
else
|
|
ch = (a <= b) ? 'd' : 'a';
|
|
|
|
switch (ch) {
|
|
case 'c':
|
|
fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
|
|
fetch(ixold, a, b, f1, '-', 0, flags);
|
|
fetch(ixnew, c, d, f2, '+', 0, flags);
|
|
break;
|
|
case 'd':
|
|
fetch(ixold, lowa, a - 1, f1, ' ', 0, flags);
|
|
fetch(ixold, a, b, f1, '-', 0, flags);
|
|
break;
|
|
case 'a':
|
|
fetch(ixnew, lowc, c - 1, f2, ' ', 0, flags);
|
|
fetch(ixnew, c, d, f2, '+', 0, flags);
|
|
break;
|
|
}
|
|
lowa = b + 1;
|
|
lowc = d + 1;
|
|
}
|
|
fetch(ixnew, d + 1, upd, f2, ' ', 0, flags);
|
|
|
|
context_vec_ptr = context_vec_start - 1;
|
|
}
|
|
|
|
static void
|
|
print_header(const char *file1, const char *file2)
|
|
{
|
|
const char *time_format;
|
|
char buf1[256];
|
|
char buf2[256];
|
|
char end1[10];
|
|
char end2[10];
|
|
struct tm tm1, tm2, *tm_ptr1, *tm_ptr2;
|
|
int nsec1 = stb1.st_mtim.tv_nsec;
|
|
int nsec2 = stb2.st_mtim.tv_nsec;
|
|
|
|
time_format = "%Y-%m-%d %H:%M:%S";
|
|
|
|
if (cflag)
|
|
time_format = "%c";
|
|
tm_ptr1 = localtime_r(&stb1.st_mtime, &tm1);
|
|
tm_ptr2 = localtime_r(&stb2.st_mtime, &tm2);
|
|
strftime(buf1, 256, time_format, tm_ptr1);
|
|
strftime(buf2, 256, time_format, tm_ptr2);
|
|
if (!cflag) {
|
|
strftime(end1, 10, "%z", tm_ptr1);
|
|
strftime(end2, 10, "%z", tm_ptr2);
|
|
sprintf(buf1, "%s.%.9d %s", buf1, nsec1, end1);
|
|
sprintf(buf2, "%s.%.9d %s", buf2, nsec2, end2);
|
|
}
|
|
if (label[0] != NULL)
|
|
diff_output("%s %s\n", diff_format == D_CONTEXT ? "***" : "---",
|
|
label[0]);
|
|
else
|
|
diff_output("%s %s\t%s\n", diff_format == D_CONTEXT ? "***" : "---",
|
|
file1, buf1);
|
|
if (label[1] != NULL)
|
|
diff_output("%s %s\n", diff_format == D_CONTEXT ? "---" : "+++",
|
|
label[1]);
|
|
else
|
|
diff_output("%s %s\t%s\n", diff_format == D_CONTEXT ? "---" : "+++",
|
|
file2, buf2);
|
|
}
|