strlcpy() should be defined directly in libtrufflerubytrampoline

src/main/c/cext-trampoline/Makefile

@@ -24,7 +24,7 @@ LDFLAGS := -m64
 ROOT := $(realpath ../../../..)
 RUBY_HDR_DIR := $(ROOT)/lib/cext/include
 
-OBJECT_FILES := trampoline.o st.o cext_constants.o
+OBJECT_FILES := trampoline.o st.o strlcpy.o cext_constants.o
 
 libtrufflerubytrampoline.$(SOEXT): $(OBJECT_FILES) Makefile
 	$(Q) $(CC) -shared $(LDFLAGS) -o $@ $(OBJECT_FILES)

src/main/c/cext-trampoline/strlcpy.c

@@ -0,0 +1,51 @@
+/*    $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $    */
+
+/*
+ * Copyright (c) 1998, 2015 Todd C. Miller <[email protected]>
+ *
+ * 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 "ruby/missing.h"
+#include <sys/types.h>
+#include <string.h>
+
+#ifndef HAVE_STRLCPY
+/*
+ * Copy string src to buffer dst of size dsize.  At most dsize-1
+ * chars will be copied.  Always NUL terminates (unless dsize == 0).
+ * Returns strlen(src); if retval >= dsize, truncation occurred.
+ */
+size_t strlcpy(char *dst, const char *src, size_t dsize) {
+    const char *osrc = src;
+    size_t nleft = dsize;
+
+    /* Copy as many bytes as will fit. */
+    if (nleft != 0) {
+        while (--nleft != 0) {
+            if ((*dst++ = *src++) == '\0')
+                break;
+        }
+    }
+
+    /* Not enough room in dst, add NUL and traverse rest of src. */
+    if (nleft == 0) {
+        if (dsize != 0)
+            *dst = '\0';        /* NUL-terminate dst */
+        while (*src++)
+            ;
+    }
+
+    return(src - osrc - 1);    /* count does not include NUL */
+}
+#endif

tool/generate-cext-trampoline.rb

@@ -41,7 +41,7 @@
 functions = []
 
 Dir["src/main/c/cext/*.c"].sort.each do |file|
-  next if %w[cext_constants.c wrappers.c ruby.c st.c].include?(File.basename(file))
+  next if %w[cext_constants.c wrappers.c ruby.c st.c strlcpy.c].include?(File.basename(file))
 
   contents = File.read(file)
   found_functions = contents.scan(function_regexp)