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	ret->mtime = -1;
 64	return ret;
 65}
 66
 67struct cgit_repo *cgit_get_repoinfo(const char *url)
 68{
 69	int i;
 70	struct cgit_repo *repo;
 71
 72	for (i=0; i<cgit_repolist.count; i++) {
 73		repo = &cgit_repolist.repos[i];
 74		if (!strcmp(repo->url, url))
 75			return repo;
 76	}
 77	return NULL;
 78}
 79
 80void *cgit_free_commitinfo(struct commitinfo *info)
 81{
 82	free(info->author);
 83	free(info->author_email);
 84	free(info->committer);
 85	free(info->committer_email);
 86	free(info->subject);
 87	free(info->msg);
 88	free(info->msg_encoding);
 89	free(info);
 90	return NULL;
 91}
 92
 93char *trim_end(const char *str, char c)
 94{
 95	int len;
 96	char *s, *t;
 97
 98	if (str == NULL)
 99		return NULL;
100	t = (char *)str;
101	len = strlen(t);
102	while(len > 0 && t[len - 1] == c)
103		len--;
104
105	if (len == 0)
106		return NULL;
107
108	c = t[len];
109	t[len] = '\0';
110	s = xstrdup(t);
111	t[len] = c;
112	return s;
113}
114
115char *strlpart(char *txt, int maxlen)
116{
117	char *result;
118
119	if (!txt)
120		return txt;
121
122	if (strlen(txt) <= maxlen)
123		return txt;
124	result = xmalloc(maxlen + 1);
125	memcpy(result, txt, maxlen - 3);
126	result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
127	result[maxlen] = '\0';
128	return result;
129}
130
131char *strrpart(char *txt, int maxlen)
132{
133	char *result;
134
135	if (!txt)
136		return txt;
137
138	if (strlen(txt) <= maxlen)
139		return txt;
140	result = xmalloc(maxlen + 1);
141	memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
142	result[0] = result[1] = result[2] = '.';
143	return result;
144}
145
146void cgit_add_ref(struct reflist *list, struct refinfo *ref)
147{
148	size_t size;
149
150	if (list->count >= list->alloc) {
151		list->alloc += (list->alloc ? list->alloc : 4);
152		size = list->alloc * sizeof(struct refinfo *);
153		list->refs = xrealloc(list->refs, size);
154	}
155	list->refs[list->count++] = ref;
156}
157
158struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
159{
160	struct refinfo *ref;
161
162	ref = xmalloc(sizeof (struct refinfo));
163	ref->refname = xstrdup(refname);
164	ref->object = parse_object(sha1);
165	switch (ref->object->type) {
166	case OBJ_TAG:
167		ref->tag = cgit_parse_tag((struct tag *)ref->object);
168		break;
169	case OBJ_COMMIT:
170		ref->commit = cgit_parse_commit((struct commit *)ref->object);
171		break;
172	}
173	return ref;
174}
175
176int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
177		  void *cb_data)
178{
179	struct reflist *list = (struct reflist *)cb_data;
180	struct refinfo *info = cgit_mk_refinfo(refname, sha1);
181
182	if (info)
183		cgit_add_ref(list, info);
184	return 0;
185}
186
187void cgit_diff_tree_cb(struct diff_queue_struct *q,
188		       struct diff_options *options, void *data)
189{
190	int i;
191
192	for (i = 0; i < q->nr; i++) {
193		if (q->queue[i]->status == 'U')
194			continue;
195		((filepair_fn)data)(q->queue[i]);
196	}
197}
198
199static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
200{
201	enum object_type type;
202
203	if (is_null_sha1(sha1)) {
204		file->ptr = (char *)"";
205		file->size = 0;
206	} else {
207		file->ptr = read_sha1_file(sha1, &type, 
208		                           (unsigned long *)&file->size);
209	}
210	return 1;
211}
212
213/*
214 * Receive diff-buffers from xdiff and concatenate them as
215 * needed across multiple callbacks.
216 *
217 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
218 * ripped from git and modified to use globals instead of
219 * a special callback-struct.
220 */
221char *diffbuf = NULL;
222int buflen = 0;
223
224int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
225{
226	int i;
227
228	for (i = 0; i < nbuf; i++) {
229		if (mb[i].ptr[mb[i].size-1] != '\n') {
230			/* Incomplete line */
231			diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
232			memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
233			buflen += mb[i].size;
234			continue;
235		}
236
237		/* we have a complete line */
238		if (!diffbuf) {
239			((linediff_fn)priv)(mb[i].ptr, mb[i].size);
240			continue;
241		}
242		diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
243		memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
244		((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
245		free(diffbuf);
246		diffbuf = NULL;
247		buflen = 0;
248	}
249	if (diffbuf) {
250		((linediff_fn)priv)(diffbuf, buflen);
251		free(diffbuf);
252		diffbuf = NULL;
253		buflen = 0;
254	}
255	return 0;
256}
257
258int cgit_diff_files(const unsigned char *old_sha1,
259		     const unsigned char *new_sha1,
260		     linediff_fn fn)
261{
262	mmfile_t file1, file2;
263	xpparam_t diff_params;
264	xdemitconf_t emit_params;
265	xdemitcb_t emit_cb;
266
267	if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
268		return 1;
269
270	memset(&diff_params, 0, sizeof(diff_params));
271	memset(&emit_params, 0, sizeof(emit_params));
272	memset(&emit_cb, 0, sizeof(emit_cb));
273	diff_params.flags = XDF_NEED_MINIMAL;
274	emit_params.ctxlen = 3;
275	emit_params.flags = XDL_EMIT_FUNCNAMES;
276	emit_cb.outf = filediff_cb;
277	emit_cb.priv = fn;
278	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
279	return 0;
280}
281
282void cgit_diff_tree(const unsigned char *old_sha1,
283		    const unsigned char *new_sha1,
284		    filepair_fn fn, const char *prefix)
285{
286	struct diff_options opt;
287	int ret;
288	int prefixlen;
289
290	diff_setup(&opt);
291	opt.output_format = DIFF_FORMAT_CALLBACK;
292	opt.detect_rename = 1;
293	opt.rename_limit = ctx.cfg.renamelimit;
294	DIFF_OPT_SET(&opt, RECURSIVE);
295	opt.format_callback = cgit_diff_tree_cb;
296	opt.format_callback_data = fn;
297	if (prefix) {
298		opt.nr_paths = 1;
299		opt.paths = &prefix;
300		prefixlen = strlen(prefix);
301		opt.pathlens = &prefixlen;
302	}
303	diff_setup_done(&opt);
304
305	if (old_sha1 && !is_null_sha1(old_sha1))
306		ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
307	else
308		ret = diff_root_tree_sha1(new_sha1, "", &opt);
309	diffcore_std(&opt);
310	diff_flush(&opt);
311}
312
313void cgit_diff_commit(struct commit *commit, filepair_fn fn)
314{
315	unsigned char *old_sha1 = NULL;
316
317	if (commit->parents)
318		old_sha1 = commit->parents->item->object.sha1;
319	cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
320}
321
322int cgit_parse_snapshots_mask(const char *str)
323{
324	const struct cgit_snapshot_format *f;
325	static const char *delim = " \t,:/|;";
326	int tl, sl, rv = 0;
327
328	/* favor legacy setting */
329	if(atoi(str))
330		return 1;
331	for(;;) {
332		str += strspn(str,delim);
333		tl = strcspn(str,delim);
334		if (!tl)
335			break;
336		for (f = cgit_snapshot_formats; f->suffix; f++) {
337			sl = strlen(f->suffix);
338			if((tl == sl && !strncmp(f->suffix, str, tl)) ||
339			   (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
340				rv |= f->bit;
341				break;
342			}
343		}
344		str += tl;
345	}
346	return rv;
347}