1/* shared.c: global vars + some callback functions
  2 *
  3 * Copyright (C) 2006 Lars Hjemli
  4 *
  5 * Licensed under GNU General Public License v2
  6 *   (see COPYING for full license text)
  7 */
  8
  9#include "cgit.h"
 10
 11struct cgit_repolist cgit_repolist;
 12struct cgit_context ctx;
 13int cgit_cmd;
 14
 15int chk_zero(int result, char *msg)
 16{
 17	if (result != 0)
 18		die("%s: %s", msg, strerror(errno));
 19	return result;
 20}
 21
 22int chk_positive(int result, char *msg)
 23{
 24	if (result <= 0)
 25		die("%s: %s", msg, strerror(errno));
 26	return result;
 27}
 28
 29int chk_non_negative(int result, char *msg)
 30{
 31    	if (result < 0)
 32	    	die("%s: %s",msg, strerror(errno));
 33	return result;
 34}
 35
 36struct cgit_repo *cgit_add_repo(const char *url)
 37{
 38	struct cgit_repo *ret;
 39
 40	if (++cgit_repolist.count > cgit_repolist.length) {
 41		if (cgit_repolist.length == 0)
 42			cgit_repolist.length = 8;
 43		else
 44			cgit_repolist.length *= 2;
 45		cgit_repolist.repos = xrealloc(cgit_repolist.repos,
 46					       cgit_repolist.length *
 47					       sizeof(struct cgit_repo));
 48	}
 49
 50	ret = &cgit_repolist.repos[cgit_repolist.count-1];
 51	ret->url = trim_end(url, '/');
 52	ret->name = ret->url;
 53	ret->path = NULL;
 54	ret->desc = "[no description]";
 55	ret->owner = NULL;
 56	ret->group = ctx.cfg.repo_group;
 57	ret->defbranch = "master";
 58	ret->snapshots = ctx.cfg.snapshots;
 59	ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
 60	ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
 61	ret->module_link = ctx.cfg.module_link;
 62	ret->readme = NULL;
 63	return ret;
 64}
 65
 66struct cgit_repo *cgit_get_repoinfo(const char *url)
 67{
 68	int i;
 69	struct cgit_repo *repo;
 70
 71	for (i=0; i<cgit_repolist.count; i++) {
 72		repo = &cgit_repolist.repos[i];
 73		if (!strcmp(repo->url, url))
 74			return repo;
 75	}
 76	return NULL;
 77}
 78
 79void *cgit_free_commitinfo(struct commitinfo *info)
 80{
 81	free(info->author);
 82	free(info->author_email);
 83	free(info->committer);
 84	free(info->committer_email);
 85	free(info->subject);
 86	free(info->msg);
 87	free(info->msg_encoding);
 88	free(info);
 89	return NULL;
 90}
 91
 92char *trim_end(const char *str, char c)
 93{
 94	int len;
 95	char *s, *t;
 96
 97	if (str == NULL)
 98		return NULL;
 99	t = (char *)str;
100	len = strlen(t);
101	while(len > 0 && t[len - 1] == c)
102		len--;
103
104	if (len == 0)
105		return NULL;
106
107	c = t[len];
108	t[len] = '\0';
109	s = xstrdup(t);
110	t[len] = c;
111	return s;
112}
113
114char *strlpart(char *txt, int maxlen)
115{
116	char *result;
117
118	if (!txt)
119		return txt;
120
121	if (strlen(txt) <= maxlen)
122		return txt;
123	result = xmalloc(maxlen + 1);
124	memcpy(result, txt, maxlen - 3);
125	result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
126	result[maxlen] = '\0';
127	return result;
128}
129
130char *strrpart(char *txt, int maxlen)
131{
132	char *result;
133
134	if (!txt)
135		return txt;
136
137	if (strlen(txt) <= maxlen)
138		return txt;
139	result = xmalloc(maxlen + 1);
140	memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
141	result[0] = result[1] = result[2] = '.';
142	return result;
143}
144
145void cgit_add_ref(struct reflist *list, struct refinfo *ref)
146{
147	size_t size;
148
149	if (list->count >= list->alloc) {
150		list->alloc += (list->alloc ? list->alloc : 4);
151		size = list->alloc * sizeof(struct refinfo *);
152		list->refs = xrealloc(list->refs, size);
153	}
154	list->refs[list->count++] = ref;
155}
156
157struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
158{
159	struct refinfo *ref;
160
161	ref = xmalloc(sizeof (struct refinfo));
162	ref->refname = xstrdup(refname);
163	ref->object = parse_object(sha1);
164	switch (ref->object->type) {
165	case OBJ_TAG:
166		ref->tag = cgit_parse_tag((struct tag *)ref->object);
167		break;
168	case OBJ_COMMIT:
169		ref->commit = cgit_parse_commit((struct commit *)ref->object);
170		break;
171	}
172	return ref;
173}
174
175int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
176		  void *cb_data)
177{
178	struct reflist *list = (struct reflist *)cb_data;
179	struct refinfo *info = cgit_mk_refinfo(refname, sha1);
180
181	if (info)
182		cgit_add_ref(list, info);
183	return 0;
184}
185
186void cgit_diff_tree_cb(struct diff_queue_struct *q,
187		       struct diff_options *options, void *data)
188{
189	int i;
190
191	for (i = 0; i < q->nr; i++) {
192		if (q->queue[i]->status == 'U')
193			continue;
194		((filepair_fn)data)(q->queue[i]);
195	}
196}
197
198static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
199{
200	enum object_type type;
201
202	if (is_null_sha1(sha1)) {
203		file->ptr = (char *)"";
204		file->size = 0;
205	} else {
206		file->ptr = read_sha1_file(sha1, &type, 
207		                           (unsigned long *)&file->size);
208	}
209	return 1;
210}
211
212/*
213 * Receive diff-buffers from xdiff and concatenate them as
214 * needed across multiple callbacks.
215 *
216 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
217 * ripped from git and modified to use globals instead of
218 * a special callback-struct.
219 */
220char *diffbuf = NULL;
221int buflen = 0;
222
223int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
224{
225	int i;
226
227	for (i = 0; i < nbuf; i++) {
228		if (mb[i].ptr[mb[i].size-1] != '\n') {
229			/* Incomplete line */
230			diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
231			memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
232			buflen += mb[i].size;
233			continue;
234		}
235
236		/* we have a complete line */
237		if (!diffbuf) {
238			((linediff_fn)priv)(mb[i].ptr, mb[i].size);
239			continue;
240		}
241		diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
242		memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
243		((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
244		free(diffbuf);
245		diffbuf = NULL;
246		buflen = 0;
247	}
248	if (diffbuf) {
249		((linediff_fn)priv)(diffbuf, buflen);
250		free(diffbuf);
251		diffbuf = NULL;
252		buflen = 0;
253	}
254	return 0;
255}
256
257int cgit_diff_files(const unsigned char *old_sha1,
258		     const unsigned char *new_sha1,
259		     linediff_fn fn)
260{
261	mmfile_t file1, file2;
262	xpparam_t diff_params;
263	xdemitconf_t emit_params;
264	xdemitcb_t emit_cb;
265
266	if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
267		return 1;
268
269	diff_params.flags = XDF_NEED_MINIMAL;
270	emit_params.ctxlen = 3;
271	emit_params.flags = XDL_EMIT_FUNCNAMES;
272	emit_params.find_func = NULL;
273	emit_cb.outf = filediff_cb;
274	emit_cb.priv = fn;
275	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
276	return 0;
277}
278
279void cgit_diff_tree(const unsigned char *old_sha1,
280		    const unsigned char *new_sha1,
281		    filepair_fn fn, const char *prefix)
282{
283	struct diff_options opt;
284	int ret;
285	int prefixlen;
286
287	diff_setup(&opt);
288	opt.output_format = DIFF_FORMAT_CALLBACK;
289	opt.detect_rename = 1;
290	opt.rename_limit = ctx.cfg.renamelimit;
291	DIFF_OPT_SET(&opt, RECURSIVE);
292	opt.format_callback = cgit_diff_tree_cb;
293	opt.format_callback_data = fn;
294	if (prefix) {
295		opt.nr_paths = 1;
296		opt.paths = &prefix;
297		prefixlen = strlen(prefix);
298		opt.pathlens = &prefixlen;
299	}
300	diff_setup_done(&opt);
301
302	if (old_sha1 && !is_null_sha1(old_sha1))
303		ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
304	else
305		ret = diff_root_tree_sha1(new_sha1, "", &opt);
306	diffcore_std(&opt);
307	diff_flush(&opt);
308}
309
310void cgit_diff_commit(struct commit *commit, filepair_fn fn)
311{
312	unsigned char *old_sha1 = NULL;
313
314	if (commit->parents)
315		old_sha1 = commit->parents->item->object.sha1;
316	cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
317}
318
319int cgit_parse_snapshots_mask(const char *str)
320{
321	const struct cgit_snapshot_format *f;
322	static const char *delim = " \t,:/|;";
323	int tl, sl, rv = 0;
324
325	/* favor legacy setting */
326	if(atoi(str))
327		return 1;
328	for(;;) {
329		str += strspn(str,delim);
330		tl = strcspn(str,delim);
331		if (!tl)
332			break;
333		for (f = cgit_snapshot_formats; f->suffix; f++) {
334			sl = strlen(f->suffix);
335			if((tl == sl && !strncmp(f->suffix, str, tl)) ||
336			   (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
337				rv |= f->bit;
338				break;
339			}
340		}
341		str += tl;
342	}
343	return rv;
344}