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Commit | Line | Data |
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d9ea73e0 JH |
1 | #include "cache.h" |
2 | #include "xdiff-interface.h" | |
8a3f524b JH |
3 | #include "strbuf.h" |
4 | ||
5 | struct xdiff_emit_state { | |
6 | xdiff_emit_consume_fn consume; | |
7 | void *consume_callback_data; | |
8 | struct strbuf remainder; | |
9 | }; | |
d9ea73e0 | 10 | |
a0fd3146 | 11 | static int parse_num(char **cp_p, int *num_p) |
c1e335a4 JH |
12 | { |
13 | char *cp = *cp_p; | |
a0fd3146 | 14 | int num = 0; |
c1e335a4 JH |
15 | int read_some; |
16 | ||
17 | while ('0' <= *cp && *cp <= '9') | |
18 | num = num * 10 + *cp++ - '0'; | |
19 | if (!(read_some = cp - *cp_p)) | |
20 | return -1; | |
21 | *cp_p = cp; | |
22 | *num_p = num; | |
23 | return 0; | |
24 | } | |
25 | ||
26 | int parse_hunk_header(char *line, int len, | |
a0fd3146 JH |
27 | int *ob, int *on, |
28 | int *nb, int *nn) | |
c1e335a4 JH |
29 | { |
30 | char *cp; | |
31 | cp = line + 4; | |
32 | if (parse_num(&cp, ob)) { | |
33 | bad_line: | |
34 | return error("malformed diff output: %s", line); | |
35 | } | |
36 | if (*cp == ',') { | |
37 | cp++; | |
38 | if (parse_num(&cp, on)) | |
39 | goto bad_line; | |
40 | } | |
41 | else | |
42 | *on = 1; | |
43 | if (*cp++ != ' ' || *cp++ != '+') | |
44 | goto bad_line; | |
45 | if (parse_num(&cp, nb)) | |
46 | goto bad_line; | |
47 | if (*cp == ',') { | |
48 | cp++; | |
49 | if (parse_num(&cp, nn)) | |
50 | goto bad_line; | |
51 | } | |
52 | else | |
53 | *nn = 1; | |
54 | return -!!memcmp(cp, " @@", 3); | |
55 | } | |
56 | ||
d9ea73e0 JH |
57 | static void consume_one(void *priv_, char *s, unsigned long size) |
58 | { | |
59 | struct xdiff_emit_state *priv = priv_; | |
60 | char *ep; | |
61 | while (size) { | |
62 | unsigned long this_size; | |
63 | ep = memchr(s, '\n', size); | |
64 | this_size = (ep == NULL) ? size : (ep - s + 1); | |
8a3f524b | 65 | priv->consume(priv->consume_callback_data, s, this_size); |
d9ea73e0 JH |
66 | size -= this_size; |
67 | s += this_size; | |
68 | } | |
69 | } | |
70 | ||
c99db9d2 | 71 | static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf) |
d9ea73e0 JH |
72 | { |
73 | struct xdiff_emit_state *priv = priv_; | |
74 | int i; | |
75 | ||
76 | for (i = 0; i < nbuf; i++) { | |
77 | if (mb[i].ptr[mb[i].size-1] != '\n') { | |
78 | /* Incomplete line */ | |
b4637760 | 79 | strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); |
d9ea73e0 JH |
80 | continue; |
81 | } | |
82 | ||
83 | /* we have a complete line */ | |
b4637760 | 84 | if (!priv->remainder.len) { |
d9ea73e0 JH |
85 | consume_one(priv, mb[i].ptr, mb[i].size); |
86 | continue; | |
87 | } | |
b4637760 BD |
88 | strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); |
89 | consume_one(priv, priv->remainder.buf, priv->remainder.len); | |
90 | strbuf_reset(&priv->remainder); | |
d9ea73e0 | 91 | } |
b4637760 BD |
92 | if (priv->remainder.len) { |
93 | consume_one(priv, priv->remainder.buf, priv->remainder.len); | |
94 | strbuf_reset(&priv->remainder); | |
d9ea73e0 JH |
95 | } |
96 | return 0; | |
97 | } | |
7cab5883 | 98 | |
913b45f5 JH |
99 | /* |
100 | * Trim down common substring at the end of the buffers, | |
101 | * but leave at least ctx lines at the end. | |
102 | */ | |
29ab27f4 | 103 | static void trim_common_tail(mmfile_t *a, mmfile_t *b, long ctx) |
913b45f5 JH |
104 | { |
105 | const int blk = 1024; | |
52499977 | 106 | long trimmed = 0, recovered = 0; |
913b45f5 JH |
107 | char *ap = a->ptr + a->size; |
108 | char *bp = b->ptr + b->size; | |
109 | long smaller = (a->size < b->size) ? a->size : b->size; | |
110 | ||
d2f82950 LT |
111 | if (ctx) |
112 | return; | |
113 | ||
913b45f5 JH |
114 | while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) { |
115 | trimmed += blk; | |
116 | ap -= blk; | |
117 | bp -= blk; | |
118 | } | |
119 | ||
d2f82950 | 120 | while (recovered < trimmed) |
52499977 | 121 | if (ap[recovered++] == '\n') |
d2f82950 LT |
122 | break; |
123 | a->size -= trimmed - recovered; | |
124 | b->size -= trimmed - recovered; | |
913b45f5 JH |
125 | } |
126 | ||
c279d7e9 JH |
127 | int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *xecb) |
128 | { | |
913b45f5 JH |
129 | mmfile_t a = *mf1; |
130 | mmfile_t b = *mf2; | |
131 | ||
132 | trim_common_tail(&a, &b, xecfg->ctxlen); | |
133 | ||
134 | return xdl_diff(&a, &b, xpp, xecfg, xecb); | |
c279d7e9 JH |
135 | } |
136 | ||
c99db9d2 | 137 | int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2, |
8a3f524b JH |
138 | xdiff_emit_consume_fn fn, void *consume_callback_data, |
139 | xpparam_t const *xpp, | |
c99db9d2 BD |
140 | xdemitconf_t const *xecfg, xdemitcb_t *xecb) |
141 | { | |
142 | int ret; | |
8a3f524b JH |
143 | struct xdiff_emit_state state; |
144 | ||
145 | memset(&state, 0, sizeof(state)); | |
146 | state.consume = fn; | |
147 | state.consume_callback_data = consume_callback_data; | |
c99db9d2 | 148 | xecb->outf = xdiff_outf; |
8a3f524b JH |
149 | xecb->priv = &state; |
150 | strbuf_init(&state.remainder, 0); | |
c99db9d2 | 151 | ret = xdi_diff(mf1, mf2, xpp, xecfg, xecb); |
8a3f524b | 152 | strbuf_release(&state.remainder); |
c99db9d2 BD |
153 | return ret; |
154 | } | |
155 | ||
7cab5883 JS |
156 | int read_mmfile(mmfile_t *ptr, const char *filename) |
157 | { | |
158 | struct stat st; | |
159 | FILE *f; | |
dc49cd76 | 160 | size_t sz; |
7cab5883 JS |
161 | |
162 | if (stat(filename, &st)) | |
163 | return error("Could not stat %s", filename); | |
164 | if ((f = fopen(filename, "rb")) == NULL) | |
165 | return error("Could not open %s", filename); | |
dc49cd76 | 166 | sz = xsize_t(st.st_size); |
381b851c JS |
167 | ptr->ptr = xmalloc(sz ? sz : 1); |
168 | if (sz && fread(ptr->ptr, sz, 1, f) != 1) | |
7cab5883 JS |
169 | return error("Could not read %s", filename); |
170 | fclose(f); | |
dc49cd76 | 171 | ptr->size = sz; |
7cab5883 JS |
172 | return 0; |
173 | } | |
174 | ||
6bfce93e JS |
175 | #define FIRST_FEW_BYTES 8000 |
176 | int buffer_is_binary(const char *ptr, unsigned long size) | |
177 | { | |
178 | if (FIRST_FEW_BYTES < size) | |
179 | size = FIRST_FEW_BYTES; | |
180 | return !!memchr(ptr, 0, size); | |
181 | } | |
f258475a JH |
182 | |
183 | struct ff_regs { | |
184 | int nr; | |
185 | struct ff_reg { | |
186 | regex_t re; | |
187 | int negate; | |
188 | } *array; | |
189 | }; | |
190 | ||
191 | static long ff_regexp(const char *line, long len, | |
192 | char *buffer, long buffer_size, void *priv) | |
193 | { | |
194 | char *line_buffer = xstrndup(line, len); /* make NUL terminated */ | |
195 | struct ff_regs *regs = priv; | |
196 | regmatch_t pmatch[2]; | |
197 | int result = 0, i; | |
198 | ||
199 | for (i = 0; i < regs->nr; i++) { | |
200 | struct ff_reg *reg = regs->array + i; | |
201 | if (reg->negate ^ !!regexec(®->re, | |
202 | line_buffer, 2, pmatch, 0)) { | |
203 | free(line_buffer); | |
204 | return -1; | |
205 | } | |
206 | } | |
207 | i = pmatch[1].rm_so >= 0 ? 1 : 0; | |
208 | line += pmatch[i].rm_so; | |
209 | result = pmatch[i].rm_eo - pmatch[i].rm_so; | |
210 | if (result > buffer_size) | |
211 | result = buffer_size; | |
212 | else | |
213 | while (result > 0 && (isspace(line[result - 1]) || | |
214 | line[result - 1] == '\n')) | |
215 | result--; | |
216 | memcpy(buffer, line, result); | |
217 | free(line_buffer); | |
218 | return result; | |
219 | } | |
220 | ||
a013585b | 221 | void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags) |
f258475a JH |
222 | { |
223 | int i; | |
224 | struct ff_regs *regs; | |
225 | ||
226 | xecfg->find_func = ff_regexp; | |
227 | regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs)); | |
228 | for (i = 0, regs->nr = 1; value[i]; i++) | |
229 | if (value[i] == '\n') | |
230 | regs->nr++; | |
231 | regs->array = xmalloc(regs->nr * sizeof(struct ff_reg)); | |
232 | for (i = 0; i < regs->nr; i++) { | |
233 | struct ff_reg *reg = regs->array + i; | |
234 | const char *ep = strchr(value, '\n'), *expression; | |
235 | char *buffer = NULL; | |
236 | ||
237 | reg->negate = (*value == '!'); | |
238 | if (reg->negate && i == regs->nr - 1) | |
239 | die("Last expression must not be negated: %s", value); | |
240 | if (*value == '!') | |
241 | value++; | |
242 | if (ep) | |
243 | expression = buffer = xstrndup(value, ep - value); | |
244 | else | |
245 | expression = value; | |
a013585b | 246 | if (regcomp(®->re, expression, cflags)) |
f258475a | 247 | die("Invalid regexp to look for hunk header: %s", expression); |
8e0f7003 | 248 | free(buffer); |
f258475a JH |
249 | value = ep + 1; |
250 | } | |
251 | } |