X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/f62d626d9b7958362fcf3605bcd2280295c0a30c..7db4f5cf67df1f2cab3a69a6efe8ae8b37bc70f6:/slstatus.c

diff --git a/slstatus.c b/slstatus.c
index 21cda51..ac09c9f 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -75,7 +75,7 @@ static void usage(void);
 
 char *argv0;
 char concat[];
-static unsigned short int delay;
+static unsigned short int delay = 0;
 static unsigned short int done;
 static unsigned short int dflag, oflag;
 static Display *dpy;
@@ -164,7 +164,7 @@ cpu_perc(void)
 	fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
 	fclose(fp);
 
-	delay = (UPDATE_INTERVAL - (UPDATE_INTERVAL - 1));
+	delay++;
 	sleep(delay);
 
 	fp = fopen("/proc/stat", "r");
@@ -405,19 +405,22 @@ ram_used(void)
 static char *
 run_command(const char *cmd)
 {
+	char *nlptr;
 	FILE *fp;
-	char buf[1024] = "n/a";
+	char buf[1024] = UNKNOWN_STR;
 
 	fp = popen(cmd, "r");
 	if (fp == NULL) {
 		warn("Failed to get command output for %s", cmd);
 		return smprintf(UNKNOWN_STR);
 	}
-	fgets(buf, sizeof(buf)-1, fp);
+	fgets(buf, sizeof(buf), fp);
 	pclose(fp);
-
 	buf[strlen(buf)] = '\0';
-	strtok(buf, "\n");
+
+	if ((nlptr = strstr(buf, "\n")) != NULL) {
+		nlptr[0] = '\0';
+	}
 
 	return smprintf("%s", buf);
 }
@@ -436,21 +439,24 @@ swap_free(void)
 		warn("Failed to open file /proc/meminfo");
 		return smprintf(UNKNOWN_STR);
 	}
-	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
+		warn("swap_free: read error");
+		fclose(fp);
+		return smprintf("%s", UNKNOWN_STR);
+	}
+
 	buf[bytes_read] = '\0';
 	fclose(fp);
-	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
-		warn("Failed to read /proc/meminfo\n");
-		return smprintf(UNKNOWN_STR);
-	}
 
-	match = strstr(buf, "SwapTotal");
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-	if (total == 0) {
-		return smprintf(UNKNOWN_STR);
+	if ((match = strstr(buf, "SwapTotal")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
 	}
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-	match = strstr(buf, "SwapFree");
+	if ((match = strstr(buf, "SwapFree")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	sscanf(match, "SwapFree: %ld kB\n", &free);
 
 	return smprintf("%f", (float)free / 1024 / 1024);
@@ -470,24 +476,29 @@ swap_perc(void)
 		warn("Failed to open file /proc/meminfo");
 		return smprintf(UNKNOWN_STR);
 	}
-	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
+		warn("swap_perc: read error");
+		fclose(fp);
+		return smprintf("%s", UNKNOWN_STR);
+	}
+
 	buf[bytes_read] = '\0';
 	fclose(fp);
-	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
-		warn("Failed to read /proc/meminfo\n");
-		return smprintf(UNKNOWN_STR);
-	}
 
-	match = strstr(buf, "SwapTotal");
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-	if (total == 0) {
-		return smprintf(UNKNOWN_STR);
+	if ((match = strstr(buf, "SwapTotal")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
 	}
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-	match = strstr(buf, "SwapCached");
+	if ((match = strstr(buf, "SwapCached")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	sscanf(match, "SwapCached: %ld kB\n", &cached);
 
-	match = strstr(buf, "SwapFree");
+	if ((match = strstr(buf, "SwapFree")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	sscanf(match, "SwapFree: %ld kB\n", &free);
 
 	return smprintf("%d%%", 100 * (total - free - cached) / total);
@@ -507,19 +518,19 @@ swap_total(void)
 		warn("Failed to open file /proc/meminfo");
 		return smprintf(UNKNOWN_STR);
 	}
-	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
+		warn("swap_total: read error");
+		fclose(fp);
+		return smprintf("%s", UNKNOWN_STR);
+	}
+
 	buf[bytes_read] = '\0';
 	fclose(fp);
-	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
-		warn("Failed to read /proc/meminfo\n");
-		return smprintf(UNKNOWN_STR);
-	}
 
-	match = strstr(buf, "SwapTotal");
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-	if (total == 0) {
-		return smprintf(UNKNOWN_STR);
+	if ((match = strstr(buf, "SwapTotal")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
 	}
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
 
 	return smprintf("%f", (float)total / 1024 / 1024);
 }
@@ -538,24 +549,28 @@ swap_used(void)
 		warn("Failed to open file /proc/meminfo");
 		return smprintf(UNKNOWN_STR);
 	}
-	bytes_read = fread(buf, sizeof(char), sizeof(buf), fp);
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf), fp)) == 0) {
+		warn("swap_used: read error");
+		fclose(fp);
+		return smprintf("%s", UNKNOWN_STR);
+	}
+
 	buf[bytes_read] = '\0';
 	fclose(fp);
-	if (bytes_read == 0 || bytes_read == sizeof(buf)) {
-		warn("Failed to read /proc/meminfo\n");
-		return smprintf(UNKNOWN_STR);
-	}
 
-	match = strstr(buf, "SwapTotal");
-	sscanf(match, "SwapTotal: %ld kB\n", &total);
-	if (total == 0) {
-		return smprintf(UNKNOWN_STR);
+	if ((match = strstr(buf, "SwapTotal")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
 	}
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
 
-	match = strstr(buf, "SwapCached");
+	if ((match = strstr(buf, "SwapCached")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	sscanf(match, "SwapCached: %ld kB\n", &cached);
 
-	match = strstr(buf, "SwapFree");
+	if ((match = strstr(buf, "SwapFree")) == NULL) {
+		return smprintf("%s", UNKNOWN_STR);
+	}
 	sscanf(match, "SwapFree: %ld kB\n", &free);
 
 	return smprintf("%f", (float)(total - free - cached) / 1024 / 1024);
@@ -826,8 +841,13 @@ main(int argc, char *argv[])
 		 * subtract delay time spend in function
 		 * calls from the actual global delay time
 		 */
-		sleep(UPDATE_INTERVAL - delay);
-		delay = 0;
+		if ((UPDATE_INTERVAL - delay) <= 0) {
+			delay = 0;
+			continue;
+		} else {
+			sleep(UPDATE_INTERVAL - delay);
+			delay = 0;
+		}
 	}
 
 	if (!oflag) {