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-rw-r--r--m4/strndup.m458
1 files changed, 58 insertions, 0 deletions
diff --git a/m4/strndup.m4 b/m4/strndup.m4
new file mode 100644
index 0000000..006a31a
--- /dev/null
+++ b/m4/strndup.m4
@@ -0,0 +1,58 @@
+# strndup.m4 serial 22
+dnl Copyright (C) 2002-2003, 2005-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_STRNDUP],
+[
+ dnl Persuade glibc <string.h> to declare strndup().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([strndup])
+ AC_CHECK_FUNCS_ONCE([strndup])
+ if test $ac_cv_have_decl_strndup = no; then
+ HAVE_DECL_STRNDUP=0
+ fi
+
+ if test $ac_cv_func_strndup = yes; then
+ HAVE_STRNDUP=1
+ # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
+ AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works],
+ [AC_RUN_IFELSE([
+ AC_LANG_PROGRAM([[#include <string.h>
+ #include <stdlib.h>]], [[
+#if !HAVE_DECL_STRNDUP
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ char *strndup (const char *, size_t);
+#endif
+ int result;
+ char *s;
+ s = strndup ("some longer string", 15);
+ free (s);
+ s = strndup ("shorter string", 13);
+ result = s[13] != '\0';
+ free (s);
+ return result;]])],
+ [gl_cv_func_strndup_works=yes],
+ [gl_cv_func_strndup_works=no],
+ [
+changequote(,)dnl
+ case $host_os in
+ aix | aix[3-6]*) gl_cv_func_strndup_works="guessing no";;
+ *) gl_cv_func_strndup_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])])
+ case $gl_cv_func_strndup_works in
+ *no) REPLACE_STRNDUP=1 ;;
+ esac
+ else
+ HAVE_STRNDUP=0
+ fi
+])