From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/mysys/mf_path.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 mysql/mysys/mf_path.c

(limited to 'mysql/mysys/mf_path.c')

diff --git a/mysql/mysys/mf_path.c b/mysql/mysys/mf_path.c
new file mode 100644
index 0000000..d3de3b2
--- /dev/null
+++ b/mysql/mysys/mf_path.c
@@ -0,0 +1,121 @@
+/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#include "mysys_priv.h"
+#include "my_sys.h"
+#include <m_string.h>
+
+static char *find_file_in_path(char *to,const char *name);
+
+	/* Finds where program can find it's files.
+	   pre_pathname is found by first locking at progname (argv[0]).
+	   if progname contains path the path is returned.
+	   else if progname is found in path, return it
+	   else if progname is given and POSIX environment variable "_" is set
+	   then path is taken from "_".
+	   If filename doesn't contain a path append MY_BASEDIR_VERSION or
+	   MY_BASEDIR if defined, else append "/my/running".
+	   own_path_name_part is concatinated to result.
+	   my_path puts result in to and returns to */
+
+char * my_path(char * to, const char *progname,
+               const char *own_pathname_part)
+{
+  char *start, *end, *prog;
+  size_t to_length;
+  DBUG_ENTER("my_path");
+
+  start=to;					/* Return this */
+  if (progname && (dirname_part(to, progname, &to_length) ||
+		   find_file_in_path(to,progname) ||
+		   ((prog=getenv("_")) != 0 &&
+                    dirname_part(to, prog, &to_length))))
+  {
+    (void) intern_filename(to,to);
+    if (!test_if_hard_path(to))
+    {
+      if (!my_getwd(curr_dir,FN_REFLEN,MYF(0)))
+	bchange((uchar*) to, 0, (uchar*) curr_dir, strlen(curr_dir), strlen(to)+1);
+    }
+  }
+  else
+  {
+    if ((end = getenv("MY_BASEDIR_VERSION")) == 0 &&
+	(end = getenv("MY_BASEDIR")) == 0)
+    {
+#ifdef DEFAULT_BASEDIR
+      end= (char*) DEFAULT_BASEDIR;
+#else
+      end= (char*) "/my/";
+#endif
+    }
+    (void) intern_filename(to,end);
+    to=strend(to);
+    if (to != start && to[-1] != FN_LIBCHAR)
+      *to++ = FN_LIBCHAR;
+    (void) my_stpcpy(to,own_pathname_part);
+  }
+  DBUG_PRINT("exit",("to: '%s'",start));
+  DBUG_RETURN(start);
+} /* my_path */
+
+
+	/* test if file without filename is found in path */
+	/* Returns to if found and to has dirpart if found, else NullS */
+
+#if defined(_WIN32)
+#define F_OK 0
+#define PATH_SEP ';'
+#define PROGRAM_EXTENSION ".exe"
+#else
+#define PATH_SEP ':'
+#endif
+
+static char *find_file_in_path(char *to, const char *name)
+{
+  char *path,*pos,dir[2];
+  const char *ext="";
+
+  if (!(path=getenv("PATH")))
+    return NullS;
+  dir[0]=FN_LIBCHAR; dir[1]=0;
+#ifdef PROGRAM_EXTENSION
+  if (!fn_ext(name)[0])
+    ext=PROGRAM_EXTENSION;
+#endif
+
+  for (pos=path ; (pos=strchr(pos,PATH_SEP)) ; path= ++pos)
+  {
+    if (path != pos)
+    {
+      strxmov(my_stpnmov(to,path,(uint) (pos-path)),dir,name,ext,NullS);
+      if (!access(to,F_OK))
+      {
+	to[(uint) (pos-path)+1]=0;	/* Return path only */
+	return to;
+      }
+    }
+  }
+#ifdef _WIN32
+  to[0]=FN_CURLIB;
+  strxmov(to+1,dir,name,ext,NullS);
+  if (!access(to,F_OK))			/* Test in current dir */
+  {
+    to[2]=0;				/* Leave ".\" */
+    return to;
+  }
+#endif
+  return NullS;				/* File not found */
+}
-- 
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