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Commit | Line | Data |
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6c510bee LT |
1 | #include "cache.h" |
2 | /* | |
3 | * convert.c - convert a file when checking it out and checking it in. | |
4 | * | |
5 | * This should use the pathname to decide on whether it wants to do some | |
6 | * more interesting conversions (automatic gzip/unzip, general format | |
7 | * conversions etc etc), but by default it just does automatic CRLF<->LF | |
8 | * translation when the "auto_crlf" option is set. | |
9 | */ | |
10 | ||
11 | struct text_stat { | |
12 | /* CR, LF and CRLF counts */ | |
13 | unsigned cr, lf, crlf; | |
14 | ||
15 | /* These are just approximations! */ | |
16 | unsigned printable, nonprintable; | |
17 | }; | |
18 | ||
19 | static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats) | |
20 | { | |
21 | unsigned long i; | |
22 | ||
23 | memset(stats, 0, sizeof(*stats)); | |
24 | ||
25 | for (i = 0; i < size; i++) { | |
26 | unsigned char c = buf[i]; | |
27 | if (c == '\r') { | |
28 | stats->cr++; | |
29 | if (i+1 < size && buf[i+1] == '\n') | |
30 | stats->crlf++; | |
31 | continue; | |
32 | } | |
33 | if (c == '\n') { | |
34 | stats->lf++; | |
35 | continue; | |
36 | } | |
37 | if (c == 127) | |
38 | /* DEL */ | |
39 | stats->nonprintable++; | |
40 | else if (c < 32) { | |
41 | switch (c) { | |
42 | /* BS, HT, ESC and FF */ | |
43 | case '\b': case '\t': case '\033': case '\014': | |
44 | stats->printable++; | |
45 | break; | |
46 | default: | |
47 | stats->nonprintable++; | |
48 | } | |
49 | } | |
50 | else | |
51 | stats->printable++; | |
52 | } | |
53 | } | |
54 | ||
55 | /* | |
56 | * The same heuristics as diff.c::mmfile_is_binary() | |
57 | */ | |
58 | static int is_binary(unsigned long size, struct text_stat *stats) | |
59 | { | |
60 | ||
61 | if ((stats->printable >> 7) < stats->nonprintable) | |
62 | return 1; | |
63 | /* | |
64 | * Other heuristics? Average line length might be relevant, | |
65 | * as might LF vs CR vs CRLF counts.. | |
66 | * | |
67 | * NOTE! It might be normal to have a low ratio of CRLF to LF | |
68 | * (somebody starts with a LF-only file and edits it with an editor | |
69 | * that adds CRLF only to lines that are added..). But do we | |
70 | * want to support CR-only? Probably not. | |
71 | */ | |
72 | return 0; | |
73 | } | |
74 | ||
75 | int convert_to_git(const char *path, char **bufp, unsigned long *sizep) | |
76 | { | |
77 | char *buffer, *nbuf; | |
78 | unsigned long size, nsize; | |
79 | struct text_stat stats; | |
80 | ||
81 | /* | |
82 | * FIXME! Other pluggable conversions should go here, | |
83 | * based on filename patterns. Right now we just do the | |
84 | * stupid auto-CRLF one. | |
85 | */ | |
86 | if (!auto_crlf) | |
87 | return 0; | |
88 | ||
89 | size = *sizep; | |
90 | if (!size) | |
91 | return 0; | |
92 | buffer = *bufp; | |
93 | ||
94 | gather_stats(buffer, size, &stats); | |
95 | ||
96 | /* No CR? Nothing to convert, regardless. */ | |
97 | if (!stats.cr) | |
98 | return 0; | |
99 | ||
100 | /* | |
101 | * We're currently not going to even try to convert stuff | |
102 | * that has bare CR characters. Does anybody do that crazy | |
103 | * stuff? | |
104 | */ | |
105 | if (stats.cr != stats.crlf) | |
106 | return 0; | |
107 | ||
108 | /* | |
109 | * And add some heuristics for binary vs text, of course... | |
110 | */ | |
111 | if (is_binary(size, &stats)) | |
112 | return 0; | |
113 | ||
114 | /* | |
115 | * Ok, allocate a new buffer, fill it in, and return true | |
116 | * to let the caller know that we switched buffers on it. | |
117 | */ | |
118 | nsize = size - stats.crlf; | |
119 | nbuf = xmalloc(nsize); | |
120 | *bufp = nbuf; | |
121 | *sizep = nsize; | |
122 | do { | |
123 | unsigned char c = *buffer++; | |
124 | if (c != '\r') | |
125 | *nbuf++ = c; | |
126 | } while (--size); | |
127 | ||
128 | return 1; | |
129 | } | |
130 | ||
131 | int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep) | |
132 | { | |
133 | char *buffer, *nbuf; | |
134 | unsigned long size, nsize; | |
135 | struct text_stat stats; | |
136 | unsigned char last; | |
137 | ||
138 | /* | |
139 | * FIXME! Other pluggable conversions should go here, | |
140 | * based on filename patterns. Right now we just do the | |
141 | * stupid auto-CRLF one. | |
142 | */ | |
d7f46334 | 143 | if (auto_crlf <= 0) |
6c510bee LT |
144 | return 0; |
145 | ||
146 | size = *sizep; | |
147 | if (!size) | |
148 | return 0; | |
149 | buffer = *bufp; | |
150 | ||
151 | gather_stats(buffer, size, &stats); | |
152 | ||
153 | /* No LF? Nothing to convert, regardless. */ | |
154 | if (!stats.lf) | |
155 | return 0; | |
156 | ||
157 | /* Was it already in CRLF format? */ | |
158 | if (stats.lf == stats.crlf) | |
159 | return 0; | |
160 | ||
161 | /* If we have any bare CR characters, we're not going to touch it */ | |
162 | if (stats.cr != stats.crlf) | |
163 | return 0; | |
164 | ||
165 | if (is_binary(size, &stats)) | |
166 | return 0; | |
167 | ||
168 | /* | |
169 | * Ok, allocate a new buffer, fill it in, and return true | |
170 | * to let the caller know that we switched buffers on it. | |
171 | */ | |
172 | nsize = size + stats.lf - stats.crlf; | |
173 | nbuf = xmalloc(nsize); | |
174 | *bufp = nbuf; | |
175 | *sizep = nsize; | |
176 | last = 0; | |
177 | do { | |
178 | unsigned char c = *buffer++; | |
179 | if (c == '\n' && last != '\r') | |
180 | *nbuf++ = '\r'; | |
181 | *nbuf++ = c; | |
182 | last = c; | |
183 | } while (--size); | |
184 | ||
185 | return 1; | |
186 | } |