]> sigrok.org Git - libsigrok.git/blob - output/float.c
Return SR_ERR_MALLOC upon allocation errors.
[libsigrok.git] / output / float.c
1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2012 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 <stdlib.h>
21 #include <string.h>
22 #include <glib.h>
23 #include "libsigrok.h"
24 #include "libsigrok-internal.h"
25
26 struct context {
27         unsigned int num_enabled_probes;
28         GPtrArray *probelist;
29 };
30
31 static int init(struct sr_output *o)
32 {
33         struct context *ctx;
34         struct sr_probe *probe;
35         GSList *l;
36
37         if (!o)
38                 return SR_ERR_ARG;
39
40         if (!o->sdi)
41                 return SR_ERR_ARG;
42
43         if (!o->sdi->driver)
44                 return SR_ERR_ARG;
45
46         if (!(ctx = g_try_malloc0(sizeof(struct context)))) {
47                 sr_err("output/float: Context malloc failed.");
48                 return SR_ERR_MALLOC;
49         }
50
51         o->internal = ctx;
52
53         /* Get the number of probes and their names. */
54         ctx->probelist = g_ptr_array_new();
55         for (l = o->sdi->probes; l; l = l->next) {
56                 probe = l->data;
57                 if (!probe || !probe->enabled)
58                         continue;
59                 g_ptr_array_add(ctx->probelist, probe->name);
60                 ctx->num_enabled_probes++;
61         }
62
63         return SR_OK;
64 }
65
66 static int event(struct sr_output *o, int event_type, uint8_t **data_out,
67                  uint64_t *length_out)
68 {
69         struct context *ctx;
70
71         if (!o)
72                 return SR_ERR_ARG;
73
74         if (!(ctx = o->internal))
75                 return SR_ERR_ARG;
76
77         if (!data_out)
78                 return SR_ERR_ARG;
79
80         switch (event_type) {
81         case SR_DF_FRAME_BEGIN:
82                 *data_out = (uint8_t *)g_strdup("FRAME-BEGIN\n");
83                 *length_out = 12;
84                 break;
85         case SR_DF_FRAME_END:
86                 *data_out = (uint8_t *)g_strdup("FRAME-END\n");
87                 *length_out = 10;
88                 break;
89         case SR_DF_END:
90                 *data_out = NULL;
91                 *length_out = 0;
92                 g_ptr_array_free(ctx->probelist, TRUE);
93                 g_free(o->internal);
94                 o->internal = NULL;
95                 break;
96         default:
97                 /* Ignore everything else. */
98                 *data_out = NULL;
99                 *length_out = 0;
100                 break;
101         }
102
103         return SR_OK;
104 }
105
106 static int data(struct sr_output *o, const uint8_t *data_in,
107                 uint64_t length_in, uint8_t **data_out, uint64_t *length_out)
108 {
109         struct context *ctx;
110         GString *outstr;
111         float *fdata;
112         uint64_t max, i;
113         unsigned int j;
114
115         if (!o)
116                 return SR_ERR_ARG;
117
118         if (!(ctx = o->internal))
119                 return SR_ERR_ARG;
120
121         if (!data_in || !data_out)
122                 return SR_ERR_ARG;
123
124         outstr = g_string_sized_new(512);
125
126         fdata = (float *)data_in;
127         max = length_in / sizeof(float);
128         for (i = 0; i < max;) {
129                 for (j = 0; j < ctx->num_enabled_probes; j++) {
130                         g_string_append_printf(outstr, "%s: %.12f\n",
131                                         (char *)g_ptr_array_index(ctx->probelist, j),
132                                         fdata[i++]);
133                 }
134         }
135
136         *data_out = (uint8_t *)outstr->str;
137         *length_out = outstr->len;
138         g_string_free(outstr, FALSE);
139
140         return SR_OK;
141 }
142
143 SR_PRIV struct sr_output_format output_float = {
144         .id = "float",
145         .description = "Floating point",
146         .df_type = SR_DF_ANALOG,
147         .init = init,
148         .data = data,
149         .event = event,
150 };