Add compatibility define for fseeko(3).

This is better than cluttering up the code with #ifdefs for obsolete
systems.

include/sudo_compat.h

@@ -390,6 +390,13 @@ int getdomainname(char *, size_t);
 # endif
 #endif /* __hpux && !__LP64__ */
 
+/*
+ * Older systems may lack fseeko(3), just use fseek(3) instead.
+ */
+#ifndef HAVE_FSEEKO
+# define fseeko(f, o, w)	fseek((f), (long)(o), (w))
+#endif
+
 /*
  * Compatibility defines for OpenSSL 1.0.2 (not needed for 1.1.x)
  */

lib/iolog/iolog_fileio.c

@@ -696,11 +696,7 @@ iolog_seek(struct iolog_file *iol, off_t offset, int whence)
 	ret = gzseek(iol->fd.g, offset, whence);
     else
 #endif
-#ifdef HAVE_FSEEKO
 	ret = fseeko(iol->fd.f, offset, whence);
-#else
-	ret = fseek(iol->fd.f, offset, whence);
-#endif
 
     //debug_return_off_t(ret);
     return ret;

plugins/audit_json/audit_json.c

@@ -60,10 +60,6 @@
 #include "sudo_util.h"
 #include "pathnames.h"
 
-#ifndef HAVE_FSEEKO
-# define fseeko(f, o, w)	fseek((f), (o), (w))
-#endif
-
 static int audit_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
 static sudo_conv_t audit_conv;
 static sudo_printf_t audit_printf;

src/utmp.c

@@ -344,11 +344,7 @@ utmp_login(const char *from_line, const char *to_line, int ttyfd,
 	}
     }
     utmp_fill(to_line, user, ut_old, &utbuf);
-# ifdef HAVE_FSEEKO
     if (fseeko(fp, slot * (off_t)sizeof(utbuf), SEEK_SET) == 0) {
-# else
-    if (fseek(fp, slot * (long)sizeof(utbuf), SEEK_SET) == 0) {
-# endif
 	if (fwrite(&utbuf, sizeof(utbuf), 1, fp) == 1)
 	    ret = true;
     }
@@ -381,11 +377,7 @@ utmp_logout(const char *line, int status)
 # endif
 	    utmp_settime(&utbuf);
 	    /* Back up and overwrite record. */
-# ifdef HAVE_FSEEKO
 	    if (fseeko(fp, (off_t)0 - (off_t)sizeof(utbuf), SEEK_CUR) == 0) {
-# else
-	    if (fseek(fp, 0L - (long)sizeof(utbuf), SEEK_CUR) == 0) {
-# endif
 		if (fwrite(&utbuf, sizeof(utbuf), 1, fp) == 1)
 		    ret = true;
 	    }