parse_probestring: Fix memory leak on error.
[sigrok-cli.git] / parsers.c
1 /*
2  * This file is part of the sigrok-cli project.
3  *
4  * Copyright (C) 2011 Bert Vermeulen <bert@biot.com>
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include "sigrok-cli.h"
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stdint.h>
24 #include <string.h>
25 #include <glib.h>
26
27 static struct sr_probe *find_probe(GSList *probelist, const char *probename)
28 {
29         struct sr_probe *probe;
30         GSList *l;
31
32         probe = NULL;
33         for (l = probelist; l; l = l->next) {
34                 probe = l->data;
35                 if (!strcmp(probe->name, probename))
36                         break;
37         }
38         probe = l ? l->data : NULL;
39
40         return probe;
41 }
42
43 GSList *parse_probestring(struct sr_dev_inst *sdi, const char *probestring)
44 {
45         struct sr_probe *probe;
46         GSList *probelist;
47         int ret, n, b, e, i;
48         char **tokens, **range, **names, *eptr, str[8];
49
50         if (!probestring || !probestring[0])
51                 /* All probes are enabled by default by the driver. */
52                 return NULL;
53
54         ret = SR_OK;
55         range = NULL;
56         names = NULL;
57         probelist = NULL;
58         tokens = g_strsplit(probestring, ",", 0);
59         for (i = 0; tokens[i]; i++) {
60                 if (tokens[i][0] == '\0') {
61                         g_critical("Invalid empty probe.");
62                         ret = SR_ERR;
63                         break;
64                 }
65                 if (strchr(tokens[i], '-')) {
66                         /* A range of probes in the form a-b. This will only work
67                          * if the probes are named as numbers -- so every probe
68                          * in the range must exist as a probe name string in the
69                          * device. */
70                         range = g_strsplit(tokens[i], "-", 2);
71                         if (!range[0] || !range[1] || range[2]) {
72                                 /* Need exactly two arguments. */
73                                 g_critical("Invalid probe syntax '%s'.", tokens[i]);
74                                 ret = SR_ERR;
75                                 goto range_fail;
76                         }
77
78                         b = strtol(range[0], &eptr, 10);
79                         if (eptr == range[0] || *eptr != '\0') {
80                                 g_critical("Invalid probe '%s'.", range[0]);
81                                 ret = SR_ERR;
82                                 goto range_fail;
83                         }
84                         e = strtol(range[1], NULL, 10);
85                         if (eptr == range[1] || *eptr != '\0') {
86                                 g_critical("Invalid probe '%s'.", range[1]);
87                                 ret = SR_ERR;
88                                 goto range_fail;
89                         }
90                         if (b < 0 || b >= e) {
91                                 g_critical("Invalid probe range '%s'.", tokens[i]);
92                                 ret = SR_ERR;
93                                 goto range_fail;
94                         }
95
96                         while (b <= e) {
97                                 n = snprintf(str, 8, "%d", b);
98                                 if (n < 0 || n > 8) {
99                                         g_critical("Invalid probe '%d'.", b);
100                                         ret = SR_ERR;
101                                         break;
102                                 }
103                                 probe = find_probe(sdi->probes, str);
104                                 if (!probe) {
105                                         g_critical("unknown probe '%d'.", b);
106                                         ret = SR_ERR;
107                                         break;
108                                 }
109                                 probelist = g_slist_append(probelist, probe);
110                                 b++;
111                         }
112 range_fail:
113                         if (range)
114                                 g_strfreev(range);
115
116                         if (ret != SR_OK)
117                                 break;
118                 } else {
119                         names = g_strsplit(tokens[i], "=", 2);
120                         if (!names[0] || (names[1] && names[2])) {
121                                 /* Need one or two arguments. */
122                                 g_critical("Invalid probe '%s'.", tokens[i]);
123                                 g_strfreev(names);
124                                 ret = SR_ERR;
125                                 break;
126                         }
127
128                         probe = find_probe(sdi->probes, names[0]);
129                         if (!probe) {
130                                 g_critical("unknown probe '%s'.", names[0]);
131                                 g_strfreev(names);
132                                 ret = SR_ERR;
133                                 break;
134                         }
135                         if (names[1]) {
136                                 /* Rename probe. */
137                                 g_free(probe->name);
138                                 probe->name = g_strdup(names[1]);
139                         }
140                         probelist = g_slist_append(probelist, probe);
141
142                         g_strfreev(names);
143                 }
144         }
145
146         if (ret != SR_OK) {
147                 g_slist_free(probelist);
148                 probelist = NULL;
149         }
150
151         g_strfreev(tokens);
152
153         return probelist;
154 }
155
156 GHashTable *parse_generic_arg(const char *arg, gboolean sep_first)
157 {
158         GHashTable *hash;
159         int i;
160         char **elements, *e;
161
162         if (!arg || !arg[0])
163                 return NULL;
164
165         i = 0;
166         hash = g_hash_table_new_full(g_str_hash, g_str_equal,
167                         g_free, g_free);
168         elements = g_strsplit(arg, ":", 0);
169         if (sep_first)
170                 g_hash_table_insert(hash, g_strdup("sigrok_key"),
171                                 g_strdup(elements[i++]));
172         for (; elements[i]; i++) {
173                 e = strchr(elements[i], '=');
174                 if (!e)
175                         g_hash_table_insert(hash, g_strdup(elements[i]), NULL);
176                 else {
177                         *e++ = '\0';
178                         g_hash_table_insert(hash, g_strdup(elements[i]), g_strdup(e));
179                 }
180         }
181         g_strfreev(elements);
182
183         return hash;
184 }
185
186 static char *strcanon(const char *str)
187 {
188         int p0, p1;
189         char *s;
190
191         /* Returns newly allocated string. */
192         s = g_ascii_strdown(str, -1);
193         for (p0 = p1 = 0; str[p0]; p0++) {
194                 if ((s[p0] >= 'a' && s[p0] <= 'z')
195                                 || (s[p0] >= '0' && s[p0] <= '9'))
196                         s[p1++] = s[p0];
197         }
198         s[p1] = '\0';
199
200         return s;
201 }
202
203 int canon_cmp(const char *str1, const char *str2)
204 {
205         int ret;
206         char *s1, *s2;
207
208         s1 = strcanon(str1);
209         s2 = strcanon(str2);
210         ret = g_ascii_strcasecmp(s1, s2);
211         g_free(s2);
212         g_free(s1);
213
214         return ret;
215 }