--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Thu Mar 27 09:53:52 2014 +0500
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2014 Sunil Nimmagadda <sunil@nimmagadda.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+#include "pop3d.h"
+
+int debug = 0;
+
+void
+set_nonblocking(int fd)
+{
+	int	 flags;
+
+	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
+		fatal("fcntl F_GETFL");
+
+	flags |= O_NONBLOCK;
+	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
+		fatal("fcntl F_SETFL");
+}
+
+void
+log_init(int n_debug)
+{
+	extern char *__progname;
+
+	debug = n_debug;
+	if (!debug)
+		openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON);
+
+	tzset();
+}
+
+void
+fatal(const char *emsg)
+{
+	if (errno)
+		logit(LOG_CRIT, "fatal: %s: %s\n", emsg, strerror(errno));
+	else
+		logit(LOG_CRIT, "fatal: %s\n", emsg);
+
+	exit(EXIT_FAILURE);
+}
+
+void
+fatalx(const char *emsg)
+{
+	errno = 0;
+	fatal(emsg);
+}
+
+void
+logit(int pri, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vlog(pri, fmt, ap);
+	va_end(ap);
+}
+
+void
+vlog(int pri, const char *fmt, va_list ap)
+{
+	char *nfmt;
+
+	if (debug) {
+		/* best effort in out of mem situations */
+		if (asprintf(&nfmt, "%s\n", fmt) == -1) {
+			vfprintf(stderr, fmt, ap);
+			fprintf(stderr, "\n");
+		} else {
+			vfprintf(stderr, nfmt, ap);
+			free(nfmt);
+		}
+		fflush(stderr);
+	} else
+		vsyslog(pri, fmt, ap);
+}
+
+void *
+xcalloc(size_t nmemb, size_t size, const char *where)
+{
+	void	*r;
+
+	if ((r = calloc(nmemb, size)) == NULL) {
+		logit(LOG_CRIT, "%s: calloc(%zu, %zu)", where, nmemb, size);
+		err(1, "exiting");
+	}
+
+	return (r);
+}
+
+int
+imsgev_xcompose(struct imsgev *iev, u_int16_t type, u_int32_t peerid,
+    uint32_t pid, int fd, void *data, u_int16_t datalen, const char *where)
+{
+	int	r;
+	r = imsgev_compose(iev, type, peerid, pid, fd, data, datalen);
+	if (r == -1) {
+		logit(LOG_CRIT, "imsgev_xcompose: %s", where);
+		errx(1, "maildrop exiting");
+	}
+
+	return (r);
+}
+
+void
+iobuf_xfqueue(struct iobuf *io, const char *where, const char *fmt, ...)
+{
+	va_list	ap;
+	int	len;
+
+	va_start(ap, fmt);
+	len = iobuf_vfqueue(io, fmt, ap);
+	va_end(ap);
+
+	if (len == -1)
+		errx(1, "%s: iobuf_xfqueue(%p, %s, ...)", where, io, fmt);
+}
+
+void
+iobuf_xqueue(struct iobuf *io, const char *where, const void *data, size_t len)
+{
+	if (iobuf_queue(io, data, len) == -1)
+		errx(1, "%s: iobuf_xqueue(%p, data, %zu)", where, io, len);
+}
+
+int
+get_index(struct session *s, const char *args, unsigned int *idx)
+{
+	const char	*errstr;
+
+	*idx = strtonum(args, 1, UINT_MAX, &errstr);
+	if (errstr || *idx < 1 || *idx > s->nmsgs) {
+		logit(LOG_INFO, "%zu: Invalid index", s->id);
+		session_reply(s, "%s", "-ERR invalid index");
+		return (0);
+	}
+
+	*idx -= 1; /* make it zero based */
+	return (1);
+}
+
+void
+log_connect(uint32_t id, struct sockaddr_storage *s, socklen_t s_len)
+{
+	char	hbuf[NI_MAXHOST];
+	int	e;
+
+	e = getnameinfo((struct sockaddr *)s, s_len, hbuf, sizeof(hbuf),
+	    NULL, 0, NI_NUMERICHOST);
+	if (e) {
+		logit(LOG_DEBUG, "getnameinfo: %s", gai_strerror(e));
+		logit(LOG_INFO, "new session with id %u", id);
+	} else
+		logit(LOG_INFO, "new session with id %u from %s", id, hbuf);
+}