Implement disk info (%free/%used/%total)

1 files changed, 67 insertions, 0 deletions

diff --git a/src/print_disk_info.c b/src/print_disk_info.c
new file mode 100644
index 0000000..84524c3
--- /dev/null
+++ b/src/print_disk_info.c
@@ -0,0 +1,67 @@
+// vim:ts=8:expandtab
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdint.h>
+#include <sys/statvfs.h>
+#include <sys/types.h>
+
+#include "i3status.h"
+
+#define TERABYTE (1024ULL * 1024 * 1024 * 1024)
+#define GIGABYTE (1024ULL * 1024 * 1024)
+#define MEGABYTE (1024ULL * 1024)
+#define KILOBYTE (1024ULL)
+
+void print_bytes_human(uint64_t bytes) {
+        /* 1 TB */
+        if (bytes > TERABYTE)
+                printf("%f TB", (double)bytes / TERABYTE);
+        else if (bytes > GIGABYTE)
+                printf("%.01f GB", (double)bytes / GIGABYTE);
+        else if (bytes > MEGABYTE)
+                printf("%.01f MB", (double)bytes / MEGABYTE);
+        else if (bytes > KILOBYTE)
+                printf("%.01f KB", (double)bytes / KILOBYTE);
+        else {
+                printf("%.01f B", (double)bytes);
+        }
+
+}
+
+/*
+ * Just parses /proc/net/wireless looking for lines beginning with
+ * wlan_interface, extracting the quality of the link and adding the
+ * current IP address of wlan_interface.
+ *
+ */
+void print_disk_info(const char *path, const char *format) {
+        const char *walk;
+        struct statvfs buf;
+
+        if (statvfs(path, &buf) == -1)
+                return;
+
+        for (walk = format; *walk != '\0'; walk++) {
+                if (*walk != '%') {
+                        putchar(*walk);
+                        continue;
+                }
+
+                if (BEGINS_WITH(walk+1, "free")) {
+                        print_bytes_human(buf.f_bsize * buf.f_bfree);
+                        walk += strlen("free");
+                }
+
+                if (BEGINS_WITH(walk+1, "used")) {
+                        print_bytes_human(buf.f_bsize * (buf.f_blocks - buf.f_bfree));
+                        walk += strlen("used");
+                }
+
+                if (BEGINS_WITH(walk+1, "total")) {
+                        print_bytes_human(buf.f_bsize * buf.f_blocks);
+                        walk += strlen("total");
+                }
+        }
+}