1 files changed, 124 insertions, 0 deletions
diff --git a/src/util/logwriter.c b/src/util/logwriter.c
new file mode 100644
index 0000000..aea2767
--- /dev/null
+++ b/src/util/logwriter.c
@@ -0,0 +1,124 @@
+/*++
+/* NAME
+/*	logwriter 3
+/* SUMMARY
+/*	logfile writer
+/* SYNOPSIS
+/*	#include <logwriter.h>
+/*
+/*	VSTREAM	*logwriter_open_or_die(
+/*	const char *path)
+/*
+/*	int	logwriter_write(
+/*	VSTREAM	*file,
+/*	const char *buffer.
+/*	ssize_t	buflen)
+/*
+/*	int	logwriter_close(
+/*	VSTREAM	*file)
+/*
+/*	int	logwriter_one_shot(
+/*	const char *path,
+/*	const char *buffer,
+/*	ssize_t	buflen)
+/* DESCRIPTION
+/*	This module manages a logfile writer.
+/*
+/*	logwriter_open_or_die() safely opens the specified file in
+/*	write+append mode. File open/create errors are fatal.
+/*
+/*	logwriter_write() writes the buffer plus newline to the
+/*	open logfile. The result is zero if successful, VSTREAM_EOF
+/*	if the operation failed.
+/*
+/*	logwriter_close() closes the logfile and destroys the VSTREAM
+/*	instance. The result is zero if there were no errors writing
+/*	the file, VSTREAM_EOF otherwise.
+/*
+/*	logwriter_one_shot() combines all the above operations. The
+/*	result is zero if successful, VSTREAM_EOF if any operation
+/*	failed.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+ /*
+  * System library.
+  */
+#include <sys_defs.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+ /*
+  * Utility library.
+  */
+#include <iostuff.h>
+#include <logwriter.h>
+#include <msg.h>
+#include <mymalloc.h>
+#include <safe_open.h>
+#include <vstream.h>
+
+ /*
+  * Application-specific.
+  */
+
+/* logwriter_open_or_die - open logfile */
+
+VSTREAM *logwriter_open_or_die(const char *path)
+{
+    VSTREAM *fp;
+    VSTRING *why = vstring_alloc(100);
+
+#define NO_STATP	((struct stat *) 0)
+#define NO_CHOWN	(-1)
+#define NO_CHGRP	(-1)
+
+    fp = safe_open(path, O_CREAT | O_WRONLY | O_APPEND, 0644,
+		   NO_STATP, NO_CHOWN, NO_CHGRP, why);
+    if (fp == 0)
+	msg_fatal("open logfile '%s': %s", path, vstring_str(why));
+    close_on_exec(vstream_fileno(fp), CLOSE_ON_EXEC);
+    vstring_free(why);
+    return (fp);
+}
+
+/* logwriter_write - append to logfile */
+
+int     logwriter_write(VSTREAM *fp, const char *buf, ssize_t len)
+{
+    if (len < 0)
+	msg_panic("logwriter_write: negative length %ld", (long) len);
+    if (vstream_fwrite(fp, buf, len) != len)
+	return (VSTREAM_EOF);
+    VSTREAM_PUTC('\n', fp);
+    return (vstream_fflush(fp));
+}
+
+/* logwriter_close - close logfile */
+
+int     logwriter_close(VSTREAM *fp)
+{
+    return (vstream_fclose(fp));
+}
+
+/* logwriter_one_shot - one-shot logwriter */
+
+int     logwriter_one_shot(const char *path, const char *buf, ssize_t len)
+{
+    VSTREAM *fp;
+    int     err;
+
+    fp = logwriter_open_or_die(path);
+    err = logwriter_write(fp, buf, len);
+    err |= logwriter_close(fp);
+    return (err ? VSTREAM_EOF : 0);
+}