From c365aeb0721d3749bb5f94f09a3ad97ec6131805 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Wed, 27 Sep 2017 20:16:01 +0000
Subject:  Rewrite openwrite(v)nclose using mkstemp

---
 src/libstddjb/openwritenclose.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/libstddjb/openwritenclose.c

(limited to 'src/libstddjb/openwritenclose.c')

diff --git a/src/libstddjb/openwritenclose.c b/src/libstddjb/openwritenclose.c
new file mode 100644
index 0000000..427e53e
--- /dev/null
+++ b/src/libstddjb/openwritenclose.c
@@ -0,0 +1,38 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <skalibs/djbunix.h>
+
+#define SUFFIX ":skalibs-openwritenclose:XXXXXX"
+
+int openwritenclose_internal (char const *fn, char const *s, size_t n, dev_t *dev, ino_t *ino, int dosync)
+{
+  dev_t tmpdev ;
+  ino_t tmpino ;
+  size_t fnlen = strlen(fn) ;
+  int fd ;
+  char tmp[fnlen + sizeof(SUFFIX)] ;
+  memcpy(tmp, fn, fnlen) ;
+  memcpy(tmp + fnlen, SUFFIX, sizeof(SUFFIX)) ;
+  fd = mkstemp(tmp) ;
+  if (fd < 0) return 0 ;
+  if (!writenclose_unsafe_internal(fd, s, n, dev ? &tmpdev : 0, ino ? &tmpino : 0, dosync)) goto failclose ;
+  if (rename(tmp, fn) < 0) goto fail ;
+  if (dev) *dev = tmpdev ;
+  if (ino) *ino = tmpino ;
+  return 1 ;
+
+ failclose:
+  fd_close(fd) ;
+ fail:
+  {
+    int e = errno ;
+    unlink(tmp) ;
+    errno = e ;
+  }
+  return 0 ;
+}
-- 
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