Add getFreeSpace()

utils.cpp

@@ -13,6 +13,7 @@ See LICENSE for license details.
 #include "utils.h"
 
 #include <sys/time.h>
+#include <sys/statvfs.h>
 #include <algorithm>
 #include <cstdio>
 #include <cstring>
@@ -571,6 +572,18 @@ size_t getFileSize(const std::string &path)
     return statbuf.st_size;
 }
 
+size_t getFreeSpace(const std::string &path)
+{
+    struct statvfs statbuf;
+    memset(&statbuf, 0, sizeof(struct statvfs));
+
+    if (statvfs(path.c_str(), &statbuf) < 0)
+        throw std::runtime_error("Can't get free space of " + path);
+
+    const size_t result {statbuf.f_bsize * statbuf.f_bfree};
+    return result;
+}
+
 std::string sockaddrToString(const sockaddr *addr)
 {
     if (!addr)

utils.h

@@ -192,6 +192,7 @@ std::string_view dirnameOf(std::string_view fname);
 BindAddr getBindAddr(int family, const std::string &bindAddress, int port);
 
 size_t getFileSize(const std::string &path);
+size_t getFreeSpace(const std::string &path);
 
 std::string sockaddrToString(const struct sockaddr *addr);