1 files changed, 138 insertions, 0 deletions
diff --git a/components/swap.c b/components/swap.c
new file mode 100644
index 0000000..f3bbeb2
--- /dev/null
+++ b/components/swap.c
@@ -0,0 +1,138 @@
+/* See LICENSE file for copyright and license details. */
+#if defined(__linux__)
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../util.h"
+
+const char *
+swap_free(void)
+{
+	long total, free;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
+		return NULL;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)free / 1024 / 1024);
+}
+
+const char *
+swap_perc(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
+		return NULL;
+	}
+
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return NULL;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%d", 100 * (total - free - cached) / total);
+}
+
+const char *
+swap_total(void)
+{
+	long total;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
+		return NULL;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	return bprintf("%f", (float)total / 1024 / 1024);
+}
+
+const char *
+swap_used(void)
+{
+	long total, free, cached;
+	FILE *fp;
+	size_t bytes_read;
+	char *match;
+
+	fp = fopen("/proc/meminfo", "r");
+	if (fp == NULL) {
+		fprintf(stderr, "fopen '/proc/meminfo': %s\n", strerror(errno));
+		return NULL;
+	}
+	if ((bytes_read = fread(buf, sizeof(char), sizeof(buf) - 1, fp)) == 0) {
+		fprintf(stderr, "fread '/proc/meminfo': %s\n", strerror(errno));
+		fclose(fp);
+		return NULL;
+	}
+	fclose(fp);
+
+	if ((match = strstr(buf, "SwapTotal")) == NULL)
+		return NULL;
+	sscanf(match, "SwapTotal: %ld kB\n", &total);
+
+	if ((match = strstr(buf, "SwapCached")) == NULL)
+		return NULL;
+	sscanf(match, "SwapCached: %ld kB\n", &cached);
+
+	if ((match = strstr(buf, "SwapFree")) == NULL)
+		return NULL;
+	sscanf(match, "SwapFree: %ld kB\n", &free);
+
+	return bprintf("%f", (float)(total - free - cached) / 1024 / 1024);
+}
+#endif