srzip: Fix handling of analog channels with index 0

[libsigrok.git] / src / output / srzip.c

diff --git a/src/output/srzip.c b/src/output/srzip.c
index 8d01e5f612a0248c5177b0a1e2b232bbb9e60a59..bfc42b21a51b9002b9ee8f025f13000d27ecb5a8 100644 (file)
--- a/src/output/srzip.c
+++ b/src/output/srzip.c
@@ -140,8 +140,9 @@ static int zip_create(const struct sr_output *o)
        g_key_file_set_integer(meta, devgroup, "total analog", enabled_analog_channels);
 
        /* Make the array one entry larger than needed so we can use the final
-        * 0 as terminator. */
+        * entry as terminator, which is set to -1. */
        outc->analog_index_map = g_malloc0(sizeof(gint) * (enabled_analog_channels + 1));
+       outc->analog_index_map[enabled_analog_channels] = -1;
 
        index = 0;
        for (l = o->sdi->channels; l; l = l->next) {
@@ -342,10 +343,10 @@ static int zip_append_analog(const struct sr_output *o,
        /* When reading the file, analog channels must be consecutive.
         * Thus we need a global channel index map as we don't know in
         * which order the channel data comes in. */
-       for (index = 0; outc->analog_index_map[index]; index++)
+       for (index = 0; outc->analog_index_map[index] != -1; index++)
                if (outc->analog_index_map[index] == channel->index)
                        break;
-       if (!outc->analog_index_map[index])
+       if (outc->analog_index_map[index] == -1)
                return SR_ERR_ARG;  /* Channel index was not in the list */
 
        index += outc->first_analog_index;