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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 | #include "merge-blobs.h" | |
7 | ||
8 | static int fill_mmfile_blob(mmfile_t *f, struct blob *obj) | |
9 | { | |
10 | void *buf; | |
11 | unsigned long size; | |
12 | enum object_type type; | |
13 | ||
14 | buf = read_sha1_file(obj->object.sha1, &type, &size); | |
15 | if (!buf) | |
16 | return -1; | |
17 | if (type != OBJ_BLOB) | |
18 | return -1; | |
19 | f->ptr = buf; | |
20 | f->size = size; | |
21 | return 0; | |
22 | } | |
23 | ||
24 | static void free_mmfile(mmfile_t *f) | |
25 | { | |
26 | free(f->ptr); | |
27 | } | |
28 | ||
29 | static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size) | |
30 | { | |
31 | int merge_status; | |
32 | mmbuffer_t res; | |
33 | ||
34 | /* | |
35 | * This function is only used by cmd_merge_tree, which | |
36 | * does not respect the merge.conflictstyle option. | |
37 | * There is no need to worry about a label for the | |
38 | * common ancestor. | |
39 | */ | |
40 | merge_status = ll_merge(&res, path, base, NULL, | |
41 | our, ".our", their, ".their", NULL); | |
42 | if (merge_status < 0) | |
43 | return NULL; | |
44 | ||
45 | *size = res.size; | |
46 | return res.ptr; | |
47 | } | |
48 | ||
49 | static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf) | |
50 | { | |
51 | int i; | |
52 | mmfile_t *dst = priv_; | |
53 | ||
54 | for (i = 0; i < nbuf; i++) { | |
55 | memcpy(dst->ptr + dst->size, mb[i].ptr, mb[i].size); | |
56 | dst->size += mb[i].size; | |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2) | |
62 | { | |
63 | unsigned long size = f1->size < f2->size ? f1->size : f2->size; | |
64 | void *ptr = xmalloc(size); | |
65 | xpparam_t xpp; | |
66 | xdemitconf_t xecfg; | |
67 | xdemitcb_t ecb; | |
68 | ||
69 | memset(&xpp, 0, sizeof(xpp)); | |
70 | xpp.flags = 0; | |
71 | memset(&xecfg, 0, sizeof(xecfg)); | |
72 | xecfg.ctxlen = 3; | |
73 | xecfg.flags = XDL_EMIT_COMMON; | |
74 | ecb.outf = common_outf; | |
75 | ||
76 | res->ptr = ptr; | |
77 | res->size = 0; | |
78 | ||
79 | ecb.priv = res; | |
80 | return xdi_diff(f1, f2, &xpp, &xecfg, &ecb); | |
81 | } | |
82 | ||
83 | void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size) | |
84 | { | |
85 | void *res = NULL; | |
86 | mmfile_t f1, f2, common; | |
87 | ||
88 | /* | |
89 | * Removed in either branch? | |
90 | * | |
91 | * NOTE! This depends on the caller having done the | |
92 | * proper warning about removing a file that got | |
93 | * modified in the other branch! | |
94 | */ | |
95 | if (!our || !their) { | |
96 | enum object_type type; | |
97 | if (base) | |
98 | return NULL; | |
99 | if (!our) | |
100 | our = their; | |
101 | return read_sha1_file(our->object.sha1, &type, size); | |
102 | } | |
103 | ||
104 | if (fill_mmfile_blob(&f1, our) < 0) | |
105 | goto out_no_mmfile; | |
106 | if (fill_mmfile_blob(&f2, their) < 0) | |
107 | goto out_free_f1; | |
108 | ||
109 | if (base) { | |
110 | if (fill_mmfile_blob(&common, base) < 0) | |
111 | goto out_free_f2_f1; | |
112 | } else { | |
113 | if (generate_common_file(&common, &f1, &f2) < 0) | |
114 | goto out_free_f2_f1; | |
115 | } | |
116 | res = three_way_filemerge(path, &common, &f1, &f2, size); | |
117 | free_mmfile(&common); | |
118 | out_free_f2_f1: | |
119 | free_mmfile(&f2); | |
120 | out_free_f1: | |
121 | free_mmfile(&f1); | |
122 | out_no_mmfile: | |
123 | return res; | |
124 | } |