From 0dd5e501ad2fb96e001bb4dd30ea46530e3f8479 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 27 Apr 2005 23:21:58 +0000
Subject: * ruby.c (set_arg0): use also environment variable space for setting 
  $0.  [ruby-core:04774]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ruby.c | 54 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 44 insertions(+), 10 deletions(-)

(limited to 'ruby.c')

diff --git a/ruby.c b/ruby.c
index 7507a53686..6ab5628a11 100644
--- a/ruby.c
+++ b/ruby.c
@@ -977,6 +977,33 @@ VALUE rb_progname;
 VALUE rb_argv;
 VALUE rb_argv0;
 
+#if !defined(PSTAT_SETCMD) && !defined(HAVE_SETPROCTITLE) && !defined(DOSISH)
+static struct {
+    char *begin, *end;
+} envspace;
+extern char **environ;
+
+static void
+set_arg0space()
+{
+    char *s;
+    int i;
+
+    if (!environ || (s = environ[0]) == NULL) return;
+    envspace.begin = s;
+    s += strlen(s);
+    for (i = 1; environ[i]; i++) {
+	if (environ[i] == s + 1) {
+	    s++;
+	    s += strlen(s);	/* this one is ok too */
+	}
+    }
+    envspace.end = s;
+}
+#else
+#define set_arg0space() ((void)0)
+#endif
+
 static void
 set_arg0(val, id)
     VALUE val;
@@ -990,19 +1017,19 @@ set_arg0(val, id)
     StringValue(val);
     s = RSTRING(val)->ptr;
     i = RSTRING(val)->len;
-#ifdef __hpux
+#if defined(PSTAT_SETCMD)
     if (i >= PST_CLEN) {
-      union pstun j;
-      j.pst_command = s;
-      i = PST_CLEN;
-      RSTRING(val)->len = i;
-      *(s + i) = '\0';
-      pstat(PSTAT_SETCMD, j, PST_CLEN, 0, 0);
+	union pstun j;
+	j.pst_command = s;
+	i = PST_CLEN;
+	RSTRING(val)->len = i;
+	*(s + i) = '\0';
+	pstat(PSTAT_SETCMD, j, PST_CLEN, 0, 0);
     }
     else {
-      union pstun j;
-      j.pst_command = s;
-      pstat(PSTAT_SETCMD, j, i, 0, 0);
+	union pstun j;
+	j.pst_command = s;
+	pstat(PSTAT_SETCMD, j, i, 0, 0);
     }
     rb_progname = rb_tainted_str_new(s, i);
 #elif defined(HAVE_SETPROCTITLE)
@@ -1024,6 +1051,12 @@ set_arg0(val, id)
 		break;
 	    }
 	}
+#ifndef DOSISH
+	if (s + 1 == envspace.begin) {
+	    s = envspace.end;
+	    ruby_setenv("", NULL); /* duplicate environ vars */
+	}
+#endif
 	len = s - origargv[0];
     }
 
@@ -1174,6 +1207,7 @@ ruby_process_options(argc, argv)
 #if defined(USE_DLN_A_OUT)
     dln_argv0 = argv[0];
 #endif
+    set_arg0space();
     proc_options(argc, argv);
 
     if (do_check && ruby_nerrs == 0) {
-- 
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