i3status: Bugfix: Reading multiple temperature sensors not possible

This patch inlines the creation of the thermal zone string in order
to force computation on each invocation. This is necessary to be able
to read the values of several temperature sensors.

1 files changed, 17 insertions, 16 deletions

diff --git a/src/print_cpu_temperature.c b/src/print_cpu_temperature.c
index 6b8aa59..306ad1d 100644
--- a/src/print_cpu_temperature.c
+++ b/src/print_cpu_temperature.c
@@ -37,11 +37,9 @@
 #endif
 
 
-static char *thermal_zone;
-
 /*
- * Reads the CPU temperature from /sys/class/thermal/thermal_zone0/temp and
- * returns the temperature in degree celcius.
+ * Reads the CPU temperature from /sys/class/thermal/thermal_zone%d/temp (or
+ * the user provided path) and returns the temperature in degree celcius.
  *
  */
 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format, int max_threshold) {
@@ -49,16 +47,14 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
 #ifdef THERMAL_ZONE
         const char *walk;
         bool colorful_output = false;
+        char *thermal_zone;
 
-        if (thermal_zone == NULL) {
-                if (path == NULL)
-                        asprintf(&thermal_zone, THERMAL_ZONE, zone);
-                else
-                        asprintf(&thermal_zone, path, zone);
-        }
-        path = thermal_zone;
+        if (path == NULL)
+                asprintf(&thermal_zone, THERMAL_ZONE, zone);
+        else
+                asprintf(&thermal_zone, path, zone);
 
-        INSTANCE(path);
+        INSTANCE(thermal_zone);
 
         for (walk = format; *walk != '\0'; walk++) {
                 if (*walk != '%') {
@@ -70,7 +66,7 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
 #if defined(LINUX)
                         static char buf[16];
                         long int temp;
-                        if (!slurp(path, buf, sizeof(buf)))
+                        if (!slurp(thermal_zone, buf, sizeof(buf)))
                                 goto error;
                         temp = strtol(buf, NULL, 10);
                         if (temp == LONG_MIN || temp == LONG_MAX || temp <= 0)
@@ -89,7 +85,7 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
                         int sysctl_rslt;
                         size_t sysctl_size = sizeof(sysctl_rslt);
-                        if (sysctlbyname(path, &sysctl_rslt, &sysctl_size, NULL, 0))
+                        if (sysctlbyname(thermal_zone, &sysctl_rslt, &sysctl_size, NULL, 0))
                                 goto error;
 
                         if (TZ_AVG(sysctl_rslt) >= max_threshold) {
@@ -121,7 +117,7 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
                         goto error;
                 }
                 /* 'path' is the node within the full path (defaults to acpitz0). */
-                if (strncmp(sensordev.xname, path, strlen(path)) == 0) {
+                if (strncmp(sensordev.xname, thermal_zone, strlen(thermal_zone)) == 0) {
                         mib[3] = SENSOR_TEMP;
                         /* Limit to temo0, but should retrieve from a full path... */
                         for (numt = 0; numt < 1 /*sensordev.maxnumt[SENSOR_TEMP]*/; numt++) {
@@ -195,7 +191,7 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
                 while ((obj2 = prop_object_iterator_next(iter2)) != NULL) {
                         obj3 = prop_dictionary_get(obj2, "description");
                         if (obj3 &&
-                            strcmp(path, prop_string_cstring_nocopy(obj3)) == 0)
+                            strcmp(thermal_zone, prop_string_cstring_nocopy(obj3)) == 0)
                         {
                                 obj3 = prop_dictionary_get(obj2, "cur-value");
                                 float temp = MUKTOC(prop_number_integer_value(obj3));
@@ -230,10 +226,15 @@ error_netbsd1:
                         walk += strlen("degrees");
                 }
         }
+
+        free(thermal_zone);
+
         OUTPUT_FULL_TEXT(buffer);
         return;
 error:
 #endif
+        free(thermal_zone);
+
         OUTPUT_FULL_TEXT("cant read temp");
         (void)fputs("i3status: Cannot read temperature. Verify that you have a thermal zone in /sys/class/thermal or disable the cpu_temperature module in your i3status config.\n", stderr);
 }