Error handling: Never output null as full_text (JSON), prefix messages with i3status (Thanks Artemis)

The former made i3bar crash, the latter is helpful for debugging.

6 files changed, 13 insertions, 10 deletions

diff --git a/src/print_cpu_temperature.c b/src/print_cpu_temperature.c
index 7797f06..8e7d7f9 100644
--- a/src/print_cpu_temperature.c
+++ b/src/print_cpu_temperature.c
@@ -113,5 +113,6 @@ void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const
         return;
 error:
 #endif
+        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);
 }
diff --git a/src/print_cpu_usage.c b/src/print_cpu_usage.c
index 7113eae..7820840 100644
--- a/src/print_cpu_usage.c
+++ b/src/print_cpu_usage.c
@@ -92,5 +92,6 @@ void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format) {
         OUTPUT_FULL_TEXT(buffer);
         return;
 error:
-        (void)fputs("Cannot read usage\n", stderr);
+        OUTPUT_FULL_TEXT("cant read cpu usage");
+        (void)fputs("i3status: Cannot read CPU usage\n", stderr);
 }
diff --git a/src/print_ip_addr.c b/src/print_ip_addr.c
index 778427c..909a8b2 100644
--- a/src/print_ip_addr.c
+++ b/src/print_ip_addr.c
@@ -56,7 +56,7 @@ const char *get_ip_addr(const char *interface) {
 
         int ret;
         if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
-                fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
+                fprintf(stderr, "i3status: getnameinfo(): %s\n", gai_strerror(ret));
                 freeifaddrs(ifaddr);
                 return "no IP";
         }
diff --git a/src/print_ipv6_addr.c b/src/print_ipv6_addr.c
index f987b59..b7f668a 100644
--- a/src/print_ipv6_addr.c
+++ b/src/print_ipv6_addr.c
@@ -51,7 +51,7 @@ static char *get_sockname(struct addrinfo *addr) {
         if ((ret = getnameinfo((struct sockaddr*)&local, local_len,
                                buf, sizeof(buf), NULL, 0,
                                NI_NUMERICHOST)) != 0) {
-                fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
+                fprintf(stderr, "i3status: getnameinfo(): %s\n", gai_strerror(ret));
                 (void)close(fd);
                 return NULL;
         }
diff --git a/src/print_load.c b/src/print_load.c
index d0d65f7..7fd54ca 100644
--- a/src/print_load.c
+++ b/src/print_load.c
@@ -45,5 +45,6 @@ void print_load(yajl_gen json_gen, char *buffer, const char *format) {
         return;
 error:
 #endif
-        (void)fputs("Cannot read load\n", stderr);
+        OUTPUT_FULL_TEXT("cant read load");
+        (void)fputs("i3status: Cannot read system load using getloadavg()\n", stderr);
 }
diff --git a/src/print_volume.c b/src/print_volume.c
index 7b38e63..dbf5e1f 100644
--- a/src/print_volume.c
+++ b/src/print_volume.c
@@ -97,14 +97,14 @@ void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *
 		}
 
 		if ((err = snd_mixer_open(&(hdl->m), 0)) < 0) {
-			fprintf(stderr, "ALSA: Cannot open mixer: %s\n", snd_strerror(err));
+			fprintf(stderr, "i3status: ALSA: Cannot open mixer: %s\n", snd_strerror(err));
 			free_hdl(hdl);
 			return;
 		}
 
 		/* Attach this mixer handle to the given device */
 		if ((err = snd_mixer_attach(hdl->m, device)) < 0) {
-			fprintf(stderr, "ALSA: Cannot attach mixer to device: %s\n", snd_strerror(err));
+			fprintf(stderr, "i3status: ALSA: Cannot attach mixer to device: %s\n", snd_strerror(err));
 			snd_mixer_close(hdl->m);
 			free_hdl(hdl);
 			return;
@@ -112,14 +112,14 @@ void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *
 
 		/* Register this mixer */
 		if ((err = snd_mixer_selem_register(hdl->m, NULL, NULL)) < 0) {
-			fprintf(stderr, "ALSA: snd_mixer_selem_register: %s\n", snd_strerror(err));
+			fprintf(stderr, "i3status: ALSA: snd_mixer_selem_register: %s\n", snd_strerror(err));
 			snd_mixer_close(hdl->m);
 			free_hdl(hdl);
 			return;
 		}
 
 		if ((err = snd_mixer_load(hdl->m)) < 0) {
-			fprintf(stderr, "ALSA: snd_mixer_load: %s\n", snd_strerror(err));
+			fprintf(stderr, "i3status: ALSA: snd_mixer_load: %s\n", snd_strerror(err));
 			snd_mixer_close(hdl->m);
 			free_hdl(hdl);
 			return;
@@ -129,7 +129,7 @@ void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *
 		snd_mixer_selem_id_set_index(hdl->sid, mixer_idx);
 		snd_mixer_selem_id_set_name(hdl->sid, mixer);
 		if (!(hdl->elem = snd_mixer_find_selem(hdl->m, hdl->sid))) {
-			fprintf(stderr, "ALSA: Cannot find mixer %s (index %i)\n",
+			fprintf(stderr, "i3status: ALSA: Cannot find mixer %s (index %i)\n",
 				snd_mixer_selem_id_get_name(hdl->sid), snd_mixer_selem_id_get_index(hdl->sid));
 			snd_mixer_close(hdl->m);
 			free_hdl(hdl);
@@ -155,7 +155,7 @@ void print_volume(yajl_gen json_gen, char *buffer, const char *fmt, const char *
 	if (snd_mixer_selem_has_playback_switch(hdl->elem)) {
 		int pbval;
 		if ((err = snd_mixer_selem_get_playback_switch(hdl->elem, 0, &pbval)) < 0)
-			fprintf (stderr, "ALSA: playback_switch: %s\n", snd_strerror(err));
+			fprintf (stderr, "i3status: ALSA: playback_switch: %s\n", snd_strerror(err));
 		if (!pbval)
 			avg = 0;
 	}