From f11bdc9925d4e73b543699dec3164adcc462e53e Mon Sep 17 00:00:00 2001
From: Matthew Flatt <mflatt@racket-lang.org>
Date: Fri, 28 Apr 2006 16:07:03 +0000
Subject: [PATCH] fix relative path in Windows `indepedent' launchers

svn: r2836
---
 collects/launcher/launcher-unit.ss | 28 ++++++++++++++++-------
 src/mzscheme/dynsrc/start.c        | 36 ++++++++++++++++++++++--------
 2 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/collects/launcher/launcher-unit.ss b/collects/launcher/launcher-unit.ss
index 59a97eeea2..0afd588c69 100644
--- a/collects/launcher/launcher-unit.ss
+++ b/collects/launcher/launcher-unit.ss
@@ -236,6 +236,15 @@
 	(let ([s (if (path? s) (path->string s) s)])
           (regexp-replace* #rx"[\"$`]" s "\\\\&")))
 
+      (define (relativize bindir-explode dest-explode)
+	(let loop ([b bindir-explode] [d dest-explode])
+	  (if (and (pair? b) (equal? (car b) (car d)))
+	      (loop (cdr b) (cdr d))
+	      (let ([p (append (map (lambda (x) 'up) (cdr d)) b)])
+		(if (null? p) 
+		    #f
+		    (apply build-path p))))))
+
       (define (make-relative-path-header dest bindir)
         ;; rely only on binaries in /usr/bin:/bin
         (define (has-exe? exe)
@@ -281,13 +290,11 @@
              "cd \"$saveD\"\n"
              "\n"
              "bindir=\"$D"
-             (let loop ([b bindir-explode] [d dest-explode])
-               (if (and (pair? b) (equal? (car b) (car d)))
-                 (loop (cdr b) (cdr d))
-                 (let ([p (append (map (lambda (x) 'up) (cdr d)) b)])
-                   (if (null? p) ""
-                       (string-append
-                        "/" (protect-shell-string (apply build-path p)))))))
+	     (let ([s (relativize bindir-explode dest-explode)])
+	       (if s
+		   (string-append "/" 
+				  (protect-shell-string s))
+		   ""))
              "\"\n"
              "PATH=\"$saveP\"\n"
              "\n")
@@ -376,7 +383,12 @@
 		    [x #rx#"<Executable Directory: Replace This[^>]*>"]
 		    [v #rx#"<Executable Variant: Replace This>"])
 		(let* ([exedir (bytes-append
-				(path->bytes plthome)
+				(path->bytes (if (let ([m (assq 'relative? aux)])
+						   (and m (cdr m)))
+						 (or (relativize (explode-path plthome)
+								 (explode-path dest))
+						     (build-path 'same))
+						 plthome))
 				;; null character marks end of executable directory
 				#"\0")]
 		       [find-it ; Find the magic start
diff --git a/src/mzscheme/dynsrc/start.c b/src/mzscheme/dynsrc/start.c
index 1377aed149..3eca91acd8 100644
--- a/src/mzscheme/dynsrc/start.c
+++ b/src/mzscheme/dynsrc/start.c
@@ -229,7 +229,6 @@ int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
 int main(int argc_in, char **argv_in)
 #endif
 {
-  char *p;
   char go[MAXCOMMANDLEN * 2];
   char *args[MAX_ARGS + 1];
   char *command_line; 
@@ -252,7 +251,33 @@ int main(int argc_in, char **argv_in)
   count = 1;
   count = parse_command_line(count, args, input, MAX_ARGS);
   
-  /* exedir should be PLTHOME path */
+  /* exedir can be relative to the current executable */
+  if ((exedir[0] == '\\')
+      || ((((exedir[0] >= 'a') && (exedir[0] <= 'z'))
+	   || 	((exedir[0] >= 'A') && (exedir[0] <= 'Z')))
+	  && (exedir[1] == ':'))) {
+    /* Absolute path */
+  } else {
+    /* Make it absolute, relative to this executable */
+    int plen;
+    int mlen;
+    char *s2, *path;
+
+    path = (char *)malloc(1024);
+    GetModuleFileName(NULL, path, 1024);
+
+    plen = strlen(exedir);
+    mlen = strlen(path);
+
+    while (mlen && (path[mlen - 1] != '\\')) {
+      mlen--;
+    }
+    s2 = (char *)malloc(mlen + plen + 1);
+    memcpy(s2, path, mlen);
+    memcpy(s2 + mlen, exedir, plen + 1);
+    exedir = s2;
+  }
+
   strcpy(go, exedir);
   strcat(go, GOSUBDIR);
   strcat(go, (variant[0] != '<') ? GOEXE3M : GOEXE);
@@ -294,13 +319,6 @@ int main(int argc_in, char **argv_in)
     /* MessageBox(NULL, args[i], "Argument", MB_OK); */
   }
   
-  /* make the exedir PLTHOME if it's not currently */
-
-  p = getenv("PLTHOME");
-  if (p == NULL || strcmp(p,exedir)) {
-    SetEnvironmentVariable("PLTHOME", exedir);
-  }
-  
   for (i = 0; i < sizeof(si); i++)
     ((char *)&si)[i] = 0;
   si.cb = sizeof(si);