File positions are off_t nowdays, not long, so:

    fseek -> fseeko
    ftell -> ftello

    NOTE: fseek/ftell not works for >long offsets per POSIX:

    [EOVERFLOW] For fseek( ), the resulting file offset would be a value which
    cannot be represented correctly in an object of type long.

    [EOVERFLOW] For ftell ( ), the current file offset cannot be represented
    correctly in an object of type long.

4 files changed, 8 insertions, 7 deletions

diff --git a/usr.bin/mail/collect.c b/usr.bin/mail/collect.c
index 7331763..12fac37 100644
--- a/usr.bin/mail/collect.c
+++ b/usr.bin/mail/collect.c
@@ -458,7 +458,7 @@ mesedit(fp, c)
 	FILE *nf = run_editor(fp, (off_t)-1, c, 0);
 
 	if (nf != NULL) {
-		(void)fseek(nf, 0L, 2);
+		(void)fseeko(nf, (off_t)0, SEEK_END);
 		collf = nf;
 		(void)Fclose(fp);
 	}
@@ -508,7 +508,7 @@ mespipe(fp, cmd)
 	/*
 	 * Take new files.
 	 */
-	(void)fseek(nf, 0L, 2);
+	(void)fseeko(nf, (off_t)0, SEEK_END);
 	collf = nf;
 	(void)Fclose(fp);
 out:
diff --git a/usr.bin/mail/edit.c b/usr.bin/mail/edit.c
index 76d679d..e8d54de 100644
--- a/usr.bin/mail/edit.c
+++ b/usr.bin/mail/edit.c
@@ -111,8 +111,8 @@ edit1(msgvec, type)
 		sigint = signal(SIGINT, SIG_IGN);
 		fp = run_editor(setinput(mp), mp->m_size, type, readonly);
 		if (fp != NULL) {
-			(void)fseek(otf, 0L, 2);
-			size = ftell(otf);
+			(void)fseeko(otf, (off_t)0, SEEK_END);
+			size = ftello(otf);
 			mp->m_block = blockof(size);
 			mp->m_offset = boffsetof(size);
 			mp->m_size = fsize(fp);
diff --git a/usr.bin/mail/fio.c b/usr.bin/mail/fio.c
index 0a017ce..c9dcb94 100644
--- a/usr.bin/mail/fio.c
+++ b/usr.bin/mail/fio.c
@@ -201,7 +201,8 @@ setinput(mp)
 {
 
 	(void)fflush(otf);
-	if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), 0) < 0)
+	if (fseeko(itf,
+		   positionof(mp->m_block, mp->m_offset), SEEK_SET) < 0)
 		err(1, "fseek");
 	return (itf);
 }
diff --git a/usr.bin/mail/quit.c b/usr.bin/mail/quit.c
index f2ba618..7831bb3 100644
--- a/usr.bin/mail/quit.c
+++ b/usr.bin/mail/quit.c
@@ -117,7 +117,7 @@ quit()
 		    (rbuf = Fdopen(fd, "w")) == NULL)
 			goto newmail;
 #ifdef APPEND
-		(void)fseek(fbuf, (long)mailsize, 0);
+		(void)fseeko(fbuf, mailsize, SEEK_SET);
 		while ((c = getc(fbuf)) != EOF)
 			(void)putc(c, rbuf);
 #else
@@ -442,7 +442,7 @@ edstop()
 			relsesigs();
 			reset(0);
 		}
-		(void)fseek(ibuf, (long)mailsize, 0);
+		(void)fseeko(ibuf, mailsize, SEEK_SET);
 		while ((c = getc(ibuf)) != EOF)
 			(void)putc(c, obuf);
 		(void)Fclose(ibuf);