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1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "xdiff-interface.h" | |
4 | #include "ll-merge.h" | |
5 | #include "blob.h" | |
6 | ||
7 | static int fill_mmfile_blob(mmfile_t *f, struct blob *obj) | |
8 | { | |
9 | void *buf; | |
10 | unsigned long size; | |
11 | enum object_type type; | |
12 | ||
13 | buf = read_sha1_file(obj->object.sha1, &type, &size); | |
14 | if (!buf) | |
15 | return -1; | |
16 | if (type != OBJ_BLOB) | |
17 | return -1; | |
18 | f->ptr = buf; | |
19 | f->size = size; | |
20 | return 0; | |
21 | } | |
22 | ||
23 | static void free_mmfile(mmfile_t *f) | |
24 | { | |
25 | free(f->ptr); | |
26 | } | |
27 | ||
28 | static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size) | |
29 | { | |
30 | int merge_status; | |
31 | mmbuffer_t res; | |
32 | ||
33 | /* | |
34 | * This function is only used by cmd_merge_tree, which | |
35 | * does not respect the merge.conflictstyle option. | |
36 | * There is no need to worry about a label for the | |
37 | * common ancestor. | |
38 | */ | |
39 | merge_status = ll_merge(&res, path, base, NULL, | |
40 | our, ".our", their, ".their", NULL); | |
41 | if (merge_status < 0) | |
42 | return NULL; | |
43 | ||
44 | *size = res.size; | |
45 | return res.ptr; | |
46 | } | |
47 | ||
48 | static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf) | |
49 | { | |
50 | int i; | |
51 | mmfile_t *dst = priv_; | |
52 | ||
53 | for (i = 0; i < nbuf; i++) { | |
54 | memcpy(dst->ptr + dst->size, mb[i].ptr, mb[i].size); | |
55 | dst->size += mb[i].size; | |
56 | } | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2) | |
61 | { | |
62 | unsigned long size = f1->size < f2->size ? f1->size : f2->size; | |
63 | void *ptr = xmalloc(size); | |
64 | xpparam_t xpp; | |
65 | xdemitconf_t xecfg; | |
66 | xdemitcb_t ecb; | |
67 | ||
68 | memset(&xpp, 0, sizeof(xpp)); | |
69 | xpp.flags = 0; | |
70 | memset(&xecfg, 0, sizeof(xecfg)); | |
71 | xecfg.ctxlen = 3; | |
72 | xecfg.flags = XDL_EMIT_COMMON; | |
73 | ecb.outf = common_outf; | |
74 | ||
75 | res->ptr = ptr; | |
76 | res->size = 0; | |
77 | ||
78 | ecb.priv = res; | |
79 | return xdi_diff(f1, f2, &xpp, &xecfg, &ecb); | |
80 | } | |
81 | ||
82 | void *merge_file(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size) | |
83 | { | |
84 | void *res = NULL; | |
85 | mmfile_t f1, f2, common; | |
86 | ||
87 | /* | |
88 | * Removed in either branch? | |
89 | * | |
90 | * NOTE! This depends on the caller having done the | |
91 | * proper warning about removing a file that got | |
92 | * modified in the other branch! | |
93 | */ | |
94 | if (!our || !their) { | |
95 | enum object_type type; | |
96 | if (base) | |
97 | return NULL; | |
98 | if (!our) | |
99 | our = their; | |
100 | return read_sha1_file(our->object.sha1, &type, size); | |
101 | } | |
102 | ||
103 | if (fill_mmfile_blob(&f1, our) < 0) | |
104 | goto out_no_mmfile; | |
105 | if (fill_mmfile_blob(&f2, their) < 0) | |
106 | goto out_free_f1; | |
107 | ||
108 | if (base) { | |
109 | if (fill_mmfile_blob(&common, base) < 0) | |
110 | goto out_free_f2_f1; | |
111 | } else { | |
112 | if (generate_common_file(&common, &f1, &f2) < 0) | |
113 | goto out_free_f2_f1; | |
114 | } | |
115 | res = three_way_filemerge(path, &common, &f1, &f2, size); | |
116 | free_mmfile(&common); | |
117 | out_free_f2_f1: | |
118 | free_mmfile(&f2); | |
119 | out_free_f1: | |
120 | free_mmfile(&f1); | |
121 | out_no_mmfile: | |
122 | return res; | |
123 | } |