This will clean up the usage. There's the slight functional change of
potentially ending up doing extra gethostname and getpid calls, but
this is neglible.
---
 notmuch-insert.c |   39 +++++++++++++++++++++++++++------------
 1 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/notmuch-insert.c b/notmuch-insert.c
index cdeeb41..a1d564c 100644
--- a/notmuch-insert.c
+++ b/notmuch-insert.c
@@ -179,6 +179,31 @@ maildir_create_folder (const void *ctx, const char 
*maildir)
     return TRUE;
 }
 
+/*
+ * Generate a temporary file basename, no path, do not create an
+ * actual file. Return the basename, or NULL on errors.
+ */
+static char *
+tempfilename (const void *ctx)
+{
+    char *filename;
+    char hostname[256];
+    struct timeval tv;
+    pid_t pid;
+
+    /* We follow the Dovecot file name generation algorithm. */
+    pid = getpid ();
+    safe_gethostname (hostname, sizeof (hostname));
+    gettimeofday (&tv, NULL);
+
+    filename = talloc_asprintf (ctx, "%ld.M%ldP%d.%s",
+                               tv.tv_sec, tv.tv_usec, pid, hostname);
+    if (! filename)
+       fprintf (stderr, "Error: %s\n", strerror (ENOMEM));
+
+    return filename;
+}
+
 /* Open a unique file in the 'tmp' sub-directory of dir.
  * Returns the file descriptor on success, or -1 on failure.
  * On success, file paths for the message in the 'tmp' and 'new'
@@ -188,23 +213,13 @@ static int
 maildir_open_tmp_file (void *ctx, const char *dir,
                       char **tmppath, char **newpath, char **newdir)
 {
-    pid_t pid;
-    char hostname[256];
-    struct timeval tv;
     char *filename;
     int fd = -1;
 
-    /* We follow the Dovecot file name generation algorithm. */
-    pid = getpid ();
-    safe_gethostname (hostname, sizeof (hostname));
     do {
-       gettimeofday (&tv, NULL);
-       filename = talloc_asprintf (ctx, "%ld.M%ldP%d.%s",
-                                   tv.tv_sec, tv.tv_usec, pid, hostname);
-       if (! filename) {
-           fprintf (stderr, "Out of memory\n");
+       filename = tempfilename (ctx);
+       if (! filename)
            return -1;
-       }
 
        *tmppath = talloc_asprintf (ctx, "%s/tmp/%s", dir, filename);
        if (! *tmppath) {
-- 
1.7.2.5

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