add prep tool and common

[ginge.git] / common / cmn.c

diff --git a/common/cmn.c b/common/cmn.c
new file mode 100644 (file)
index 0000000..9f802ba
--- /dev/null
+++ b/common/cmn.c
@@ -0,0 +1,43 @@
+#ifdef LOADER
+#include "../loader/realfuncs.h"
+#endif
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "cmn.h"
+
+int make_local_path(char *buf, size_t size, const char *file)
+{
+  ssize_t ret;
+  char *p;
+
+  ret = readlink("/proc/self/exe", buf, size - 1);
+  if (ret < 0) {
+    perror("readlink");
+    goto err;
+  }
+  buf[ret] = 0;
+
+  p = strrchr(buf, '/');
+  if (p == NULL)
+    goto err;
+  p++;
+
+  if (strstr(p, ".so")) {
+    p = getenv("GINGE_ROOT");
+    if (p == NULL)
+      goto err;
+    strcpy(buf, p);
+    p = buf + strlen(buf);
+  }
+
+  snprintf(p, size - (p - buf), "%s", file);
+
+  return 0;
+
+err:
+  fprintf(stderr, "ginge: can't determine root, buf: \"%s\"\n", buf);
+  return -1;
+}
+