Add a -to-file <filename> switch to the echo command

As discussed in #2836

1 files changed, 9 insertions, 0 deletions

diff --git a/src/file.cc b/src/file.cc
index 7b49595e..52a0f288 100644
--- a/src/file.cc
+++ b/src/file.cc
@@ -257,6 +257,15 @@ void write(int fd, StringView data)
     }
 }
 
+void write_to_file(StringView filename, StringView data)
+{
+    const int fd = open(filename.zstr(), O_CREAT | O_WRONLY | O_TRUNC, 0644);
+    if (fd == -1)
+        throw file_access_error(filename, strerror(errno));
+    auto close_fd = on_scope_end([fd]{ close(fd); });
+    write(fd, data);
+}
+
 struct BufferedWriter
 {
     BufferedWriter(int fd) : fd{fd} {}