1 
2 
3 /*ROR
4  * Copyright (c) 1991, 1993
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. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	@(#)diff.h	8.1 (Berkeley) 6/6/93
32  */
33 
34 #include <sys/types.h>
35 #include <regex.h>
36 
37 /*
38  * Output format options
39  */
40 #define	D_UNIFIED	3	/* Unified context diff */
41 #define	D_BRIEF		6	/* Say if the files differ */
42 
43 /*
44  * Output flags
45  */
46 #define	D_HEADER	0x001	/* Print a header/footer between files */
47 #define	D_EMPTY1	0x002	/* Treat first file as empty (/dev/null) */
48 #define	D_EMPTY2	0x004	/* Treat second file as empty (/dev/null) */
49 
50 /*
51  * Command line flags
52  */
53 #define D_FORCEASCII	0x008	/* Treat file as ascii regardless of content */
54 #define D_FOLDBLANKS	0x010	/* Treat all white space as equal */
55 #define D_MINIMAL	0x020	/* Make diff as small as possible */
56 #define D_IGNORECASE	0x040	/* Case-insensitive matching */
57 #define D_PROTOTYPE	0x080	/* Display C function prototype */
58 #define D_EXPANDTABS	0x100	/* Expand tabs to spaces */
59 #define D_IGNOREBLANKS	0x200	/* Ignore white space changes */
60 
61 /*
62  * Status values for got_diffreg() return values
63  */
64 #define	D_SAME		0	/* Files are the same */
65 #define	D_DIFFER	1	/* Files are different */
66 #define	D_BINARY	2	/* Binary files are different */
67 #define	D_MISMATCH1	3	/* path1 was a dir, path2 a file */
68 #define	D_MISMATCH2	4	/* path1 was a file, path2 a dir */
69 #define	D_SKIPPED1	5	/* path1 was a special file */
70 #define	D_SKIPPED2	6	/* path2 was a special file */
71 
72 struct excludes {
73 	char *pattern;
74 	struct excludes *next;
75 };
76 
77 /*
78  * The following struct is used to record change information when
79  * doing a "context" or "unified" diff.  (see routine "change" to
80  * understand the highly mnemonic field names)
81  */
82 struct context_vec {
83 	int	a;		/* start line in old file */
84 	int	b;		/* end line in old file */
85 	int	c;		/* start line in new file */
86 	int	d;		/* end line in new file */
87 };
88 
89 struct got_diff_change {
90 	SIMPLEQ_ENTRY(got_diff_change) entry;
91 	struct context_vec cv;
92 };
93 
94 struct got_diff_changes {
95 	size_t nchanges;
96 	SIMPLEQ_HEAD(, got_diff_change) entries;
97 };
98 
99 struct got_diff_state {
100 	int  *J;			/* will be overlaid on class */
101 	int  *class;		/* will be overlaid on file[0] */
102 	int  *klist;		/* will be overlaid on file[0] after class */
103 	int  *member;		/* will be overlaid on file[1] */
104 	int   clen;
105 	int   len[2];
106 	int   pref, suff;	/* length of prefix and suffix */
107 	int   slen[2];
108 	int   anychange;
109 	long *ixnew;		/* will be overlaid on file[1] */
110 	long *ixold;		/* will be overlaid on klist */
111 	struct cand *clist;	/* merely a free storage pot for candidates */
112 	int   clistlen;		/* the length of clist */
113 	struct line *sfile[2];	/* shortened by pruning common prefix/suffix */
114 	u_char *chrtran;		/* translation table for case-folding */
115 	struct context_vec *context_vec_start;
116 	struct context_vec *context_vec_end;
117 	struct context_vec *context_vec_ptr;
118 	struct line *file[2];
119 #define FUNCTION_CONTEXT_SIZE	55
120 	char lastbuf[FUNCTION_CONTEXT_SIZE];
121 	int lastline;
122 	int lastmatchline;
123 	struct stat stb1, stb2;
124 	size_t max_context;
125 };
126 
127 struct got_diff_args {
128 	int	 Tflag;
129 	int	 diff_format, diff_context, status;
130 	char	 *diffargs;
131 	const char *label[2];
132 };
133 
134 const struct got_error *got_diffreg(int *, FILE *,
135     FILE *, int, struct got_diff_args *, struct got_diff_state *, FILE *,
136     struct got_diff_changes *);
137 
138 const struct got_error *got_diff_blob_lines_changed(struct got_diff_changes **,
139     struct got_blob_object *, struct got_blob_object *);
140 void got_diff_free_changes(struct got_diff_changes *);