summaryrefslogtreecommitdiffabout
path: root/src/lookup.c
blob: fdf1ae175a6f83494a5f2b1893203389b85bfe05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/* grecs - Gray's Extensible Configuration System
   Copyright (C) 2007-2011 Sergey Poznyakoff

   Grecs is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 3 of the License, or (at your
   option) any later version.

   Grecs is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Grecs. If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "grecs.h"
#include "wordsplit.h"

static int
_grecs_list_eq(struct grecs_value *a, struct grecs_value *b)
{
	struct grecs_list_entry *aent, *bent;
	if (grecs_list_size(a->v.list) != grecs_list_size(b->v.list))
		return 0;

	for (aent = a->v.list->head, bent = b->v.list->head;;
	     aent = aent->next, bent = bent->next) {
		if (!aent)
			return bent == NULL;
		if (!bent)
			return 0;
		if (!grecs_value_eq(aent->data, bent->data))
			return 0;
	}
	/*notreached*/
	return 1;
}

static int
_grecs_array_eq(struct grecs_value *a, struct grecs_value *b)
{
	size_t i;

	if (a->v.arg.c != b->v.arg.c)
		return 0;

	for (i = 0; i < a->v.arg.c; i++)
		if (!grecs_value_eq(&a->v.arg.v[i], &b->v.arg.v[i]))
			return 0;
	return 1;
}

/* Return 1 if configuration value A equals B */
int
grecs_value_eq(struct grecs_value *a, struct grecs_value *b)
{
	if (a->type != b->type)
		return 0;
	switch (a->type) {
	case GRECS_TYPE_STRING:
		if (a->v.string == NULL)
			return b->v.string == NULL;
		return strcmp(a->v.string, b->v.string) == 0;
      
	case GRECS_TYPE_LIST:
		return _grecs_list_eq(a, b);
      
	case GRECS_TYPE_ARRAY:
		return _grecs_array_eq(a, b);
    }
  return 0;
}


static int
split_cfg_path(const char *path, int *pargc, char ***pargv)
{
	int argc;
	char **argv;
	char *delim = ".";
	char static_delim[2] = { 0, 0 };
  
	if (path[0] == '\\') {
		argv = calloc(2, sizeof (*argv));
		if (!argv)
			return ENOMEM;
		argv[0] = strdup(path + 1);
		if (!argv[0]) {
			free(argv);
			return ENOMEM;
		}
		argv[1] = NULL;
		argc = 1;
	} else {
		struct wordsplit ws;
		
		if (ispunct(path[0])) {
			delim = static_delim;
			delim[0] = path[0];
			path++;
		}
		ws.ws_delim = delim;
      
		if (wordsplit(path, &ws, WRDSF_DEFFLAGS|WRDSF_DELIM))
			return errno;
		argc = ws.ws_wordc;
		argv = ws.ws_wordv;
		ws.ws_wordc = 0;
		ws.ws_wordv = NULL;
		wordsplit_free(&ws);
	}
  
	*pargc = argc;
	*pargv = argv;
	
	return 0;
}

static void
free_value_mem(struct grecs_value *p)
{
	switch (p->type) {
	case GRECS_TYPE_STRING:
		free((char*)p->v.string);
		break;
      
	case GRECS_TYPE_LIST:
		/* FIXME */
		break;
      
	case GRECS_TYPE_ARRAY: {
		size_t i;
		for (i = 0; i < p->v.arg.c; i++)
			free_value_mem(&p->v.arg.v[i]);
	}
    }
}

static void
destroy_value(void *p)
{
	struct grecs_value*val = p;
	if (val) {
		free_value_mem(val);
		free(val);
	}
}

static struct grecs_value *
parse_label(const char *str)
{
	struct grecs_value *val = NULL;
	size_t i;
	struct wordsplit ws;
	size_t len = strlen (str);
  
	if (len > 1 && str[0] == '(' && str[len-1] == ')') {
		struct grecs_list *lst;
      
		ws.ws_delim = ",";
		if (wordsplit_len (str + 1, len - 2, &ws,
				      WRDSF_DEFFLAGS|WRDSF_DELIM|
				      WRDSF_WS)) {
			return NULL;
		}

		lst = grecs_list_create();
		lst->free_entry = destroy_value;
		for (i = 0; i < ws.ws_wordc; i++) {
			struct grecs_value *p = grecs_malloc(sizeof(*p));
			p->type = GRECS_TYPE_STRING;
			p->v.string = ws.ws_wordv[i];
			grecs_list_append(lst, p);
		}
		val = grecs_malloc(sizeof(*val));
		val->type = GRECS_TYPE_LIST;
		val->v.list = lst;
	} else {      
		if (wordsplit(str, &ws, WRDSF_DEFFLAGS))
			return NULL;
		val = grecs_malloc(sizeof(*val));
		if (ws.ws_wordc == 1) {
			val->type = GRECS_TYPE_STRING;
			val->v.string = ws.ws_wordv[0];
		} else {
			val->type = GRECS_TYPE_ARRAY;
			val->v.arg.c = ws.ws_wordc;
			val->v.arg.v = grecs_malloc(ws.ws_wordc *
						    sizeof(val->v.arg.v[0]));
			for (i = 0; i < ws.ws_wordc; i++) {
				val->v.arg.v[i].type = GRECS_TYPE_STRING;
				val->v.arg.v[i].v.string = ws.ws_wordv[i];
			}
		}
		ws.ws_wordc = 0;
		wordsplit_free(&ws);
	}
	return val;
}


struct find_closure {
	int argc;
	char **argv;
	int tag;
	struct grecs_value *label;
	struct grecs_node *node;
};

static void
parse_tag(struct find_closure *fptr)
{
	char *p = strchr(fptr->argv[fptr->tag], '=');
	if (p) {
		*p++ = 0;
		fptr->label = parse_label(p);
	}
	else
		fptr->label = NULL;
}

static enum grecs_tree_recurse_res
node_finder(enum grecs_tree_recurse_op op, struct grecs_node *node, void *data)
{
	struct find_closure *fdptr = data;

	if (op == grecs_tree_recurse_post)
		return grecs_tree_recurse_ok;
	
	if (strcmp(fdptr->argv[fdptr->tag], node->ident) == 0
	    && (!fdptr->label || grecs_value_eq(fdptr->label, &node->value))) {
		fdptr->tag++;
		if (fdptr->tag == fdptr->argc) {
			fdptr->node = node;
			return grecs_tree_recurse_stop;
		}
		parse_tag(fdptr);
		return grecs_tree_recurse_ok;
	}
  
	return node->type == grecs_node_block ?
		grecs_tree_recurse_skip : grecs_tree_recurse_ok;
}

struct grecs_node *
grecs_find_node(struct grecs_node *node, const char *path)
{
	int rc, i;
	struct find_closure clos;
  
	rc = split_cfg_path(path, &clos.argc, &clos.argv);
	if (!clos.argc)
		return NULL;
	clos.tag = 0;
	clos.label = NULL;
	clos.node = NULL;
	parse_tag(&clos);
	grecs_tree_recurse(node, node_finder, &clos);
	for (i = 0; i < clos.argc; i++)
		free(clos.argv[i]);
	free(clos.argv);
	destroy_value(clos.label);
	return clos.node;
}
	

Return to:

Send suggestions and report system problems to the System administrator.