1 files changed, 52 insertions, 0 deletions
diff --git a/src/memory.c b/src/memory.c
new file mode 100644
index 0000000..833fa97
--- /dev/null
+++ b/src/memory.c
@@ -0,0 +1,52 @@
+#include "memory.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+long long int run_mem_command(const char *command) {
+  char buf[128];
+  long long int res = 0;
+
+  FILE *p = popen(command, "r");
+  if (!p) {
+    fprintf(stderr, "ホストコマンドを実効に失敗: %s", command);
+    return 0;
+  }
+
+  while (fgets(buf, sizeof(buf), p) != NULL) {
+    buf[strcspn(buf, "\n")] = '\0';
+  }
+
+  res = atoll(buf);
+  pclose(p);
+
+  return res;
+}
+
+void display_memory() {
+  long long int memused = 0;
+  long long int memtotal = 0;
+#if defined(__OpenBSD__)
+  memused = run_mem_command("vmstat | awk 'END {printf $3}' | sed 's/M//'");
+  memtotal = run_mem_command("sysctl -n hw.physmem") / 1024LL / 1024LL;
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+  memtotal = run_mem_command("sysctl -n hw.physmem") / 1024LL / 1024LL;
+#elif defined(__NetBSD__)
+  memused = run_mem_command("top | grep \"Memory:\" | awk '{print $2}' | "
+      "sed 's/M//'");
+  memtotal = run_mem_command("sysctl -n hw.physmem64") / 1024LL / 1024LL;
+#elif defined(__minix)
+  memtotal = run_mem_command("sysctl -n hw.physmem") / 1024LL / 1024LL;
+#elif defined(__linux__)
+  long long int memaval = run_mem_command("cat /proc/meminfo | grep MemAvailable | "
+                                          "awk '{print $2}'") / 1024LL;
+  memtotal = run_mem_command("cat /proc/meminfo | grep MemTotal | "
+      "awk '{print $2}'") / 1024LL;
+  memused = memtotal - memaval;
+  /* memused = run_mem_command("cat /proc/meminfo | grep MemFree | "
+      "awk '{print $2}'") / 1024LL; */
+#endif
+
+  printf("%lld MiB / %lld MiB", memused, memtotal);
+}