ruby-runner.h

* template/ruby-runner.h.in: separate configured part from
  ruby-runner.c.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54572 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 35 insertions, 0 deletions

diff --git a/ruby-runner.c b/ruby-runner.c
new file mode 100644
index 0000000000..c16e7c6829
--- /dev/null
+++ b/ruby-runner.c
@@ -0,0 +1,35 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "ruby-runner.h"
+
+#define STRINGIZE(expr) STRINGIZE0(expr)
+#define STRINGIZE0(expr) #expr
+
+int
+main(int argc, char **argv)
+{
+    static const char builddir[] = BUILDDIR;
+    const char *libpath = getenv(LIBPATHENV);
+    char c = 0;
+
+    if (libpath) {
+	while ((c = *libpath) == PATH_SEP) ++libpath;
+    }
+    if (c) {
+	size_t n = strlen(libpath);
+	char *e = malloc(sizeof(builddir)+n+1);
+	memcpy(e, builddir, sizeof(builddir)-1);
+	e[sizeof(builddir)-1] = PATH_SEP;
+	memcpy(e+sizeof(builddir), libpath, n+1);
+	libpath = e;
+    }
+    else {
+	libpath = builddir;
+    }
+    setenv(LIBPATHENV, libpath, 1);
+    execv(BUILDDIR"/"STRINGIZE(RUBY_INSTALL_NAME), argv);
+    return -1;
+}