From: Joel Rosdahl <joel@rosdahl.net>
Date: Sun, 13 Nov 2022 08:48:10 +0000 (+0100)
Subject: perf: Optimize util::write_file for empty data
X-Git-Tag: v4.7.4~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4905b1afacb01bff907b89dd4b05dff66b31790b;p=thirdparty%2Fccache.git

perf: Optimize util::write_file for empty data
---

diff --git a/src/util/file.cpp b/src/util/file.cpp
index db0f4e839..7b718969e 100644
--- a/src/util/file.cpp
+++ b/src/util/file.cpp
@@ -296,7 +296,7 @@ nonstd::expected<void, std::string>
 write_fd(int fd, const void* data, size_t size)
 {
   int64_t written = 0;
-  do {
+  while (static_cast<size_t>(written) < size) {
     const auto count =
       write(fd, static_cast<const uint8_t*>(data) + written, size - written);
     if (count == -1) {
@@ -306,7 +306,7 @@ write_fd(int fd, const void* data, size_t size)
     } else {
       written += count;
     }
-  } while (static_cast<size_t>(written) < size);
+  }
   return {};
 }