git-apply: add "--check" option to check that the diff makes sense
[git/git.git] / diffcore.h
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#ifndef _DIFFCORE_H_
5#define _DIFFCORE_H_
6
7/* This header file is internal between diff.c and its diff transformers
8 * (e.g. diffcore-rename, diffcore-pickaxe). Never include this header
9 * in anything else.
10 */
11#define MAX_SCORE 10000
12#define DEFAULT_MINIMUM_SCORE 5000
13
14#define RENAME_DST_MATCHED 01
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15
16struct diff_filespec {
17 unsigned char sha1[20];
18 char *path;
19 void *data;
20 unsigned long size;
21 int xfrm_flags; /* for use by the xfrm */
22 unsigned short mode; /* file mode */
23 unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
24 * if false, use the name and read from
25 * the filesystem.
26 */
81e50eab 27#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
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28 unsigned should_free : 1; /* data should be free()'ed */
29 unsigned should_munmap : 1; /* data should be munmap()'ed */
30};
31
32extern struct diff_filespec *alloc_filespec(const char *);
33extern void fill_filespec(struct diff_filespec *, const unsigned char *,
34 unsigned short);
35
36extern int diff_populate_filespec(struct diff_filespec *);
37extern void diff_free_filespec_data(struct diff_filespec *);
38
52e95789 39struct diff_filepair {
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40 struct diff_filespec *one;
41 struct diff_filespec *two;
f7c1512a 42 int score; /* only valid when one and two are different paths */
b6d8f309 43 int status; /* M C R N D U (see Documentation/diff-format.txt) */
427dcb4b 44};
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45#define DIFF_PAIR_UNMERGED(p) \
46 (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
427dcb4b 47
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48#define DIFF_PAIR_TYPE_CHANGED(p) \
49 ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
50
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51extern int diff_unmodified_pair(struct diff_filepair *);
52
427dcb4b 53struct diff_queue_struct {
52e95789 54 struct diff_filepair **queue;
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55 int alloc;
56 int nr;
57};
58
38c6f780 59extern struct diff_queue_struct diff_queued_diff;
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60extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
61 struct diff_filespec *,
62 struct diff_filespec *);
6b14d7fa 63extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
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64
65extern int diff_needs_to_stay(struct diff_queue_struct *, int,
66 struct diff_filespec *);
427dcb4b 67
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68#define DIFF_DEBUG 0
69#if DIFF_DEBUG
70void diff_debug_filespec(struct diff_filespec *, int, const char *);
71void diff_debug_filepair(const struct diff_filepair *, int);
72void diff_debug_queue(const char *, struct diff_queue_struct *);
73#else
74#define diff_debug_filespec(a,b,c) do {} while(0)
75#define diff_debug_filepair(a,b) do {} while(0)
76#define diff_debug_queue(a,b) do {} while(0)
77#endif
78
427dcb4b 79#endif