eal: add new i40e device id
[dpdk.git] / lib / librte_cfgfile / rte_cfgfile.c
1 /*-
2  *   BSD LICENSE
3  *
4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5  *   All rights reserved.
6  *
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8  *   modification, are permitted provided that the following conditions
9  *   are met:
10  *
11  *     * Redistributions of source code must retain the above copyright
12  *       notice, this list of conditions and the following disclaimer.
13  *     * Redistributions in binary form must reproduce the above copyright
14  *       notice, this list of conditions and the following disclaimer in
15  *       the documentation and/or other materials provided with the
16  *       distribution.
17  *     * Neither the name of Intel Corporation nor the names of its
18  *       contributors may be used to endorse or promote products derived
19  *       from this software without specific prior written permission.
20  *
21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <ctype.h>
38 #include <rte_string_fns.h>
39
40 #include "rte_cfgfile.h"
41
42 struct rte_cfgfile_section {
43         char name[CFG_NAME_LEN];
44         int num_entries;
45         struct rte_cfgfile_entry *entries[0];
46 };
47
48 struct rte_cfgfile {
49         int flags;
50         int num_sections;
51         struct rte_cfgfile_section *sections[0];
52 };
53
54 /** when we resize a file structure, how many extra entries
55  * for new sections do we add in */
56 #define CFG_ALLOC_SECTION_BATCH 8
57 /** when we resize a section structure, how many extra entries
58  * for new entries do we add in */
59 #define CFG_ALLOC_ENTRY_BATCH 16
60
61 static unsigned
62 _strip(char *str, unsigned len)
63 {
64         int newlen = len;
65         if (len == 0)
66                 return 0;
67
68         if (isspace(str[len-1])) {
69                 /* strip trailing whitespace */
70                 while (newlen > 0 && isspace(str[newlen - 1]))
71                         str[--newlen] = '\0';
72         }
73
74         if (isspace(str[0])) {
75                 /* strip leading whitespace */
76                 int i, start = 1;
77                 while (isspace(str[start]) && start < newlen)
78                         start++
79                         ; /* do nothing */
80                 newlen -= start;
81                 for (i = 0; i < newlen; i++)
82                         str[i] = str[i+start];
83                 str[i] = '\0';
84         }
85         return newlen;
86 }
87
88 struct rte_cfgfile *
89 rte_cfgfile_load(const char *filename, int flags)
90 {
91         int allocated_sections = CFG_ALLOC_SECTION_BATCH;
92         int allocated_entries = 0;
93         int curr_section = -1;
94         int curr_entry = -1;
95         char buffer[256] = {0};
96         int lineno = 0;
97         struct rte_cfgfile *cfg = NULL;
98
99         FILE *f = fopen(filename, "r");
100         if (f == NULL)
101                 return NULL;
102
103         cfg = malloc(sizeof(*cfg) + sizeof(cfg->sections[0]) *
104                 allocated_sections);
105         if (cfg == NULL)
106                 goto error2;
107
108         memset(cfg->sections, 0, sizeof(cfg->sections[0]) * allocated_sections);
109
110         while (fgets(buffer, sizeof(buffer), f) != NULL) {
111                 char *pos = NULL;
112                 size_t len = strnlen(buffer, sizeof(buffer));
113                 lineno++;
114                 if ((len >= sizeof(buffer) - 1) && (buffer[len-1] != '\n')) {
115                         printf("Error line %d - no \\n found on string. "
116                                         "Check if line too long\n", lineno);
117                         goto error1;
118                 }
119                 pos = memchr(buffer, ';', sizeof(buffer));
120                 if (pos != NULL) {
121                         *pos = '\0';
122                         len = pos -  buffer;
123                 }
124
125                 len = _strip(buffer, len);
126                 if (buffer[0] != '[' && memchr(buffer, '=', len) == NULL)
127                         continue;
128
129                 if (buffer[0] == '[') {
130                         /* section heading line */
131                         char *end = memchr(buffer, ']', len);
132                         if (end == NULL) {
133                                 printf("Error line %d - no terminating '['"
134                                         "character found\n", lineno);
135                                 goto error1;
136                         }
137                         *end = '\0';
138                         _strip(&buffer[1], end - &buffer[1]);
139
140                         /* close off old section and add start new one */
141                         if (curr_section >= 0)
142                                 cfg->sections[curr_section]->num_entries =
143                                         curr_entry + 1;
144                         curr_section++;
145
146                         /* resize overall struct if we don't have room for more
147                         sections */
148                         if (curr_section == allocated_sections) {
149                                 allocated_sections += CFG_ALLOC_SECTION_BATCH;
150                                 struct rte_cfgfile *n_cfg = realloc(cfg,
151                                         sizeof(*cfg) + sizeof(cfg->sections[0])
152                                         * allocated_sections);
153                                 if (n_cfg == NULL) {
154                                         printf("Error - no more memory\n");
155                                         goto error1;
156                                 }
157                                 cfg = n_cfg;
158                         }
159
160                         /* allocate space for new section */
161                         allocated_entries = CFG_ALLOC_ENTRY_BATCH;
162                         curr_entry = -1;
163                         cfg->sections[curr_section] = malloc(
164                                 sizeof(*cfg->sections[0]) +
165                                 sizeof(cfg->sections[0]->entries[0]) *
166                                 allocated_entries);
167                         if (cfg->sections[curr_section] == NULL) {
168                                 printf("Error - no more memory\n");
169                                 goto error1;
170                         }
171
172                         snprintf(cfg->sections[curr_section]->name,
173                                         sizeof(cfg->sections[0]->name),
174                                         "%s", &buffer[1]);
175                 } else {
176                         /* value line */
177                         if (curr_section < 0) {
178                                 printf("Error line %d - value outside of"
179                                         "section\n", lineno);
180                                 goto error1;
181                         }
182
183                         struct rte_cfgfile_section *sect =
184                                 cfg->sections[curr_section];
185                         char *split[2];
186                         if (rte_strsplit(buffer, sizeof(buffer), split, 2, '=')
187                                 != 2) {
188                                 printf("Error at line %d - cannot split "
189                                         "string\n", lineno);
190                                 goto error1;
191                         }
192
193                         curr_entry++;
194                         if (curr_entry == allocated_entries) {
195                                 allocated_entries += CFG_ALLOC_ENTRY_BATCH;
196                                 struct rte_cfgfile_section *n_sect = realloc(
197                                         sect, sizeof(*sect) +
198                                         sizeof(sect->entries[0]) *
199                                         allocated_entries);
200                                 if (n_sect == NULL) {
201                                         printf("Error - no more memory\n");
202                                         goto error1;
203                                 }
204                                 sect = cfg->sections[curr_section] = n_sect;
205                         }
206
207                         sect->entries[curr_entry] = malloc(
208                                 sizeof(*sect->entries[0]));
209                         if (sect->entries[curr_entry] == NULL) {
210                                 printf("Error - no more memory\n");
211                                 goto error1;
212                         }
213
214                         struct rte_cfgfile_entry *entry = sect->entries[
215                                 curr_entry];
216                         snprintf(entry->name, sizeof(entry->name), "%s",
217                                 split[0]);
218                         snprintf(entry->value, sizeof(entry->value), "%s",
219                                 split[1]);
220                         _strip(entry->name, strnlen(entry->name,
221                                 sizeof(entry->name)));
222                         _strip(entry->value, strnlen(entry->value,
223                                 sizeof(entry->value)));
224                 }
225         }
226         fclose(f);
227         cfg->flags = flags;
228         cfg->num_sections = curr_section + 1;
229         /* curr_section will still be -1 if we have an empty file */
230         if (curr_section >= 0)
231                 cfg->sections[curr_section]->num_entries = curr_entry + 1;
232         return cfg;
233
234 error1:
235         rte_cfgfile_close(cfg);
236 error2:
237         fclose(f);
238         return NULL;
239 }
240
241
242 int rte_cfgfile_close(struct rte_cfgfile *cfg)
243 {
244         int i, j;
245
246         if (cfg == NULL)
247                 return -1;
248
249         for (i = 0; i < cfg->num_sections; i++) {
250                 if (cfg->sections[i] != NULL) {
251                         if (cfg->sections[i]->num_entries) {
252                                 for (j = 0; j < cfg->sections[i]->num_entries;
253                                         j++) {
254                                         if (cfg->sections[i]->entries[j] !=
255                                                 NULL)
256                                                 free(cfg->sections[i]->
257                                                         entries[j]);
258                                 }
259                         }
260                         free(cfg->sections[i]);
261                 }
262         }
263         free(cfg);
264
265         return 0;
266 }
267
268 int
269 rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sectionname,
270 size_t length)
271 {
272         int i;
273         int num_sections = 0;
274         for (i = 0; i < cfg->num_sections; i++) {
275                 if (strncmp(cfg->sections[i]->name, sectionname, length) == 0)
276                         num_sections++;
277         }
278         return num_sections;
279 }
280
281 int
282 rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
283         int max_sections)
284 {
285         int i;
286
287         for (i = 0; i < cfg->num_sections && i < max_sections; i++)
288                 snprintf(sections[i], CFG_NAME_LEN, "%s",
289                 cfg->sections[i]->name);
290
291         return i;
292 }
293
294 static const struct rte_cfgfile_section *
295 _get_section(struct rte_cfgfile *cfg, const char *sectionname)
296 {
297         int i;
298         for (i = 0; i < cfg->num_sections; i++) {
299                 if (strncmp(cfg->sections[i]->name, sectionname,
300                                 sizeof(cfg->sections[0]->name)) == 0)
301                         return cfg->sections[i];
302         }
303         return NULL;
304 }
305
306 int
307 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
308 {
309         return (_get_section(cfg, sectionname) != NULL);
310 }
311
312 int
313 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
314         const char *sectionname)
315 {
316         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
317         if (s == NULL)
318                 return -1;
319         return s->num_entries;
320 }
321
322
323 int
324 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
325                 struct rte_cfgfile_entry *entries, int max_entries)
326 {
327         int i;
328         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
329         if (sect == NULL)
330                 return -1;
331         for (i = 0; i < max_entries && i < sect->num_entries; i++)
332                 entries[i] = *sect->entries[i];
333         return i;
334 }
335
336 const char *
337 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
338                 const char *entryname)
339 {
340         int i;
341         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
342         if (sect == NULL)
343                 return NULL;
344         for (i = 0; i < sect->num_entries; i++)
345                 if (strncmp(sect->entries[i]->name, entryname, CFG_NAME_LEN)
346                         == 0)
347                         return sect->entries[i]->value;
348         return NULL;
349 }
350
351 int
352 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
353                 const char *entryname)
354 {
355         return (rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL);
356 }