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Commit | Line | Data |
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6c510bee | 1 | #include "cache.h" |
35ebfd6a JH |
2 | #include "attr.h" |
3 | ||
6c510bee LT |
4 | /* |
5 | * convert.c - convert a file when checking it out and checking it in. | |
6 | * | |
7 | * This should use the pathname to decide on whether it wants to do some | |
8 | * more interesting conversions (automatic gzip/unzip, general format | |
9 | * conversions etc etc), but by default it just does automatic CRLF<->LF | |
10 | * translation when the "auto_crlf" option is set. | |
11 | */ | |
12 | ||
13 | struct text_stat { | |
14 | /* CR, LF and CRLF counts */ | |
15 | unsigned cr, lf, crlf; | |
16 | ||
17 | /* These are just approximations! */ | |
18 | unsigned printable, nonprintable; | |
19 | }; | |
20 | ||
21 | static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) | |
22 | { | |
23 | unsigned long i; | |
24 | ||
25 | memset(stats, 0, sizeof(*stats)); | |
26 | ||
27 | for (i = 0; i < size; i++) { | |
28 | unsigned char c = buf[i]; | |
29 | if (c == '\r') { | |
30 | stats->cr++; | |
31 | if (i+1 < size && buf[i+1] == '\n') | |
32 | stats->crlf++; | |
33 | continue; | |
34 | } | |
35 | if (c == '\n') { | |
36 | stats->lf++; | |
37 | continue; | |
38 | } | |
39 | if (c == 127) | |
40 | /* DEL */ | |
41 | stats->nonprintable++; | |
42 | else if (c < 32) { | |
43 | switch (c) { | |
44 | /* BS, HT, ESC and FF */ | |
45 | case '\b': case '\t': case '\033': case '\014': | |
46 | stats->printable++; | |
47 | break; | |
48 | default: | |
49 | stats->nonprintable++; | |
50 | } | |
51 | } | |
52 | else | |
53 | stats->printable++; | |
54 | } | |
55 | } | |
56 | ||
57 | /* | |
58 | * The same heuristics as diff.c::mmfile_is_binary() | |
59 | */ | |
60 | static int is_binary(unsigned long size, struct text_stat *stats) | |
61 | { | |
62 | ||
63 | if ((stats->printable >> 7) < stats->nonprintable) | |
64 | return 1; | |
65 | /* | |
66 | * Other heuristics? Average line length might be relevant, | |
67 | * as might LF vs CR vs CRLF counts.. | |
68 | * | |
69 | * NOTE! It might be normal to have a low ratio of CRLF to LF | |
70 | * (somebody starts with a LF-only file and edits it with an editor | |
71 | * that adds CRLF only to lines that are added..). But do we | |
72 | * want to support CR-only? Probably not. | |
73 | */ | |
74 | return 0; | |
75 | } | |
76 | ||
201ac8ef | 77 | static int crlf_to_git(const char *path, char **bufp, unsigned long *sizep, int guess) |
6c510bee LT |
78 | { |
79 | char *buffer, *nbuf; | |
80 | unsigned long size, nsize; | |
81 | struct text_stat stats; | |
82 | ||
201ac8ef | 83 | if (guess && !auto_crlf) |
6c510bee LT |
84 | return 0; |
85 | ||
86 | size = *sizep; | |
87 | if (!size) | |
88 | return 0; | |
89 | buffer = *bufp; | |
90 | ||
91 | gather_stats(buffer, size, &stats); | |
92 | ||
93 | /* No CR? Nothing to convert, regardless. */ | |
94 | if (!stats.cr) | |
95 | return 0; | |
96 | ||
201ac8ef JH |
97 | if (guess) { |
98 | /* | |
99 | * We're currently not going to even try to convert stuff | |
100 | * that has bare CR characters. Does anybody do that crazy | |
101 | * stuff? | |
102 | */ | |
103 | if (stats.cr != stats.crlf) | |
104 | return 0; | |
105 | ||
106 | /* | |
107 | * And add some heuristics for binary vs text, of course... | |
108 | */ | |
109 | if (is_binary(size, &stats)) | |
110 | return 0; | |
111 | } | |
6c510bee LT |
112 | |
113 | /* | |
114 | * Ok, allocate a new buffer, fill it in, and return true | |
115 | * to let the caller know that we switched buffers on it. | |
116 | */ | |
117 | nsize = size - stats.crlf; | |
118 | nbuf = xmalloc(nsize); | |
119 | *bufp = nbuf; | |
120 | *sizep = nsize; | |
201ac8ef JH |
121 | |
122 | if (guess) { | |
123 | do { | |
124 | unsigned char c = *buffer++; | |
125 | if (c != '\r') | |
126 | *nbuf++ = c; | |
127 | } while (--size); | |
128 | } else { | |
129 | do { | |
130 | unsigned char c = *buffer++; | |
131 | if (! (c == '\r' && (1 < size && *buffer == '\n'))) | |
132 | *nbuf++ = c; | |
133 | } while (--size); | |
134 | } | |
6c510bee LT |
135 | |
136 | return 1; | |
137 | } | |
138 | ||
201ac8ef JH |
139 | static int autocrlf_to_git(const char *path, char **bufp, unsigned long *sizep) |
140 | { | |
141 | return crlf_to_git(path, bufp, sizep, 1); | |
142 | } | |
143 | ||
144 | static int forcecrlf_to_git(const char *path, char **bufp, unsigned long *sizep) | |
145 | { | |
146 | return crlf_to_git(path, bufp, sizep, 0); | |
147 | } | |
148 | ||
149 | static int crlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep, int guess) | |
6c510bee LT |
150 | { |
151 | char *buffer, *nbuf; | |
152 | unsigned long size, nsize; | |
153 | struct text_stat stats; | |
154 | unsigned char last; | |
155 | ||
201ac8ef | 156 | if (guess && auto_crlf <= 0) |
6c510bee LT |
157 | return 0; |
158 | ||
159 | size = *sizep; | |
160 | if (!size) | |
161 | return 0; | |
162 | buffer = *bufp; | |
163 | ||
164 | gather_stats(buffer, size, &stats); | |
165 | ||
166 | /* No LF? Nothing to convert, regardless. */ | |
167 | if (!stats.lf) | |
168 | return 0; | |
169 | ||
170 | /* Was it already in CRLF format? */ | |
171 | if (stats.lf == stats.crlf) | |
172 | return 0; | |
173 | ||
201ac8ef JH |
174 | if (guess) { |
175 | /* If we have any bare CR characters, we're not going to touch it */ | |
176 | if (stats.cr != stats.crlf) | |
177 | return 0; | |
6c510bee | 178 | |
201ac8ef JH |
179 | if (is_binary(size, &stats)) |
180 | return 0; | |
181 | } | |
6c510bee LT |
182 | |
183 | /* | |
184 | * Ok, allocate a new buffer, fill it in, and return true | |
185 | * to let the caller know that we switched buffers on it. | |
186 | */ | |
187 | nsize = size + stats.lf - stats.crlf; | |
188 | nbuf = xmalloc(nsize); | |
189 | *bufp = nbuf; | |
190 | *sizep = nsize; | |
191 | last = 0; | |
192 | do { | |
193 | unsigned char c = *buffer++; | |
194 | if (c == '\n' && last != '\r') | |
195 | *nbuf++ = '\r'; | |
196 | *nbuf++ = c; | |
197 | last = c; | |
198 | } while (--size); | |
199 | ||
200 | return 1; | |
201 | } | |
35ebfd6a | 202 | |
201ac8ef JH |
203 | static int autocrlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep) |
204 | { | |
205 | return crlf_to_working_tree(path, bufp, sizep, 1); | |
206 | } | |
207 | ||
208 | static int forcecrlf_to_working_tree(const char *path, char **bufp, unsigned long *sizep) | |
209 | { | |
210 | return crlf_to_working_tree(path, bufp, sizep, 0); | |
211 | } | |
212 | ||
35ebfd6a JH |
213 | static void setup_crlf_check(struct git_attr_check *check) |
214 | { | |
215 | static struct git_attr *attr_crlf; | |
216 | ||
217 | if (!attr_crlf) | |
218 | attr_crlf = git_attr("crlf", 4); | |
219 | check->attr = attr_crlf; | |
220 | } | |
221 | ||
201ac8ef | 222 | static int git_path_check_crlf(const char *path) |
35ebfd6a JH |
223 | { |
224 | struct git_attr_check attr_crlf_check; | |
225 | ||
226 | setup_crlf_check(&attr_crlf_check); | |
227 | ||
201ac8ef JH |
228 | if (git_checkattr(path, 1, &attr_crlf_check)) |
229 | return -1; | |
230 | return attr_crlf_check.isset; | |
35ebfd6a JH |
231 | } |
232 | ||
233 | int convert_to_git(const char *path, char **bufp, unsigned long *sizep) | |
234 | { | |
201ac8ef JH |
235 | switch (git_path_check_crlf(path)) { |
236 | case 0: | |
35ebfd6a | 237 | return 0; |
201ac8ef JH |
238 | case 1: |
239 | return forcecrlf_to_git(path, bufp, sizep); | |
240 | default: | |
241 | return autocrlf_to_git(path, bufp, sizep); | |
242 | } | |
35ebfd6a JH |
243 | } |
244 | ||
245 | int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep) | |
246 | { | |
201ac8ef JH |
247 | switch (git_path_check_crlf(path)) { |
248 | case 0: | |
35ebfd6a | 249 | return 0; |
201ac8ef JH |
250 | case 1: |
251 | return forcecrlf_to_working_tree(path, bufp, sizep); | |
252 | default: | |
253 | return autocrlf_to_working_tree(path, bufp, sizep); | |
254 | } | |
35ebfd6a | 255 | } |