Compat code for strndup and strnlen.

Makefile.am

@@ -228,6 +228,12 @@ endif
 if NO_STRLCPY
 nodist_tmux_SOURCES += compat/strlcpy.c
 endif
+if NO_STRNLEN
+nodist_tmux_SOURCES += compat/strnlen.c
+endif
+if NO_STRNDUP
+nodist_tmux_SOURCES += compat/strndup.c
+endif
 if NO_ASPRINTF
 nodist_tmux_SOURCES += compat/asprintf.c
 endif

compat.h

@@ -247,6 +247,16 @@ size_t	 	 strlcpy(char *, const char *, size_t);
 size_t	 	 strlcat(char *, const char *, size_t);
 #endif
 
+#ifndef HAVE_STRNLEN
+/* strnlen.c */
+size_t		 strnlen(const char *, size_t);
+#endif
+
+#ifndef HAVE_STRNDUP
+/* strndup.c */
+char		*strndup(const char *, size_t);
+#endif
+
 #ifndef HAVE_DAEMON
 /* daemon.c */
 int	 	 daemon(int, int);

compat/strndup.c

@@ -0,0 +1,41 @@
+/*	$OpenBSD: strndup.c,v 1.2 2015/08/31 02:53:57 guenther Exp $	*/
+
+/*
+ * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * 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 <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "compat.h"
+
+char *
+strndup(const char *str, size_t maxlen)
+{
+	char *copy;
+	size_t len;
+
+	len = strnlen(str, maxlen);
+	copy = malloc(len + 1);
+	if (copy != NULL) {
+		(void)memcpy(copy, str, len);
+		copy[len] = '\0';
+	}
+
+	return copy;
+}

compat/strnlen.c

@@ -0,0 +1,34 @@
+/*	$OpenBSD: strnlen.c,v 1.8 2016/10/16 17:37:39 dtucker Exp $	*/
+
+/*
+ * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * 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 <string.h>
+
+#include "compat.h"
+
+size_t
+strnlen(const char *str, size_t maxlen)
+{
+	const char *cp;
+
+	for (cp = str; maxlen != 0 && *cp != '\0'; cp++, maxlen--)
+		;
+
+	return (size_t)(cp - str);
+}

configure.ac

@@ -423,6 +423,20 @@ if test "x$found_strlcat" = xyes; then
 fi
 AM_CONDITIONAL(NO_STRLCAT, [test "x$found_strlcat" = xno])
 
+# Look for strnlen, compat/strnlen.c used if missing.
+AC_CHECK_FUNC(strnlen, found_strnlen=yes, found_strnlen=no)
+if test "x$found_strnlen" = xyes; then
+	AC_DEFINE(HAVE_STRNLEN)
+fi
+AM_CONDITIONAL(NO_STRNLEN, [test "x$found_strnlen" = xno])
+
+# Look for strndup, compat/strndup.c used if missing.
+AC_CHECK_FUNC(strndup, found_strndup=yes, found_strndup=no)
+if test "x$found_strndup" = xyes; then
+	AC_DEFINE(HAVE_STRNDUP)
+fi
+AM_CONDITIONAL(NO_STRNDUP, [test "x$found_strndup" = xno])
+
 # Look for asprintf, compat/asprintf.c used if missing.
 AC_CHECK_FUNC(asprintf, found_asprintf=yes, found_asprintf=no)
 if test "x$found_asprintf" = xyes; then