nobu	2017-05-29 15:39:41 +0900 (Mon, 29 May 2017)

  New Revision: 58950

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58950

  Log:
    ruby-runner.c: replace argv[0]

  Modified files:
    trunk/ruby-runner.c
Index: ruby-runner.c
===================================================================
--- ruby-runner.c	(revision 58949)
+++ ruby-runner.c	(revision 58950)
@@ -12,6 +12,11 @@ int https://github.com/ruby/ruby/blob/trunk/ruby-runner.c#L12
 main(int argc, char **argv)
 {
     static const char builddir[] = BUILDDIR;
+    static const char rubypath[] = BUILDDIR"/"STRINGIZE(RUBY_INSTALL_NAME);
+    const size_t dirsize = sizeof(builddir);
+    const size_t namesize = sizeof(rubypath) - dirsize;
+    const char *rubyname = rubypath + dirsize;
+    char *arg0 = argv[0], *p;
     const char *libpath = getenv(LIBPATHENV);
     char c = 0;
 
@@ -20,16 +25,27 @@ main(int argc, char **argv) https://github.com/ruby/ruby/blob/trunk/ruby-runner.c#L25
     }
     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);
+	char *e = malloc(dirsize+n+1);
+	memcpy(e, builddir, dirsize-1);
+	e[dirsize-1] = PATH_SEP;
+	memcpy(e+dirsize, libpath, n+1);
 	libpath = e;
     }
     else {
 	libpath = builddir;
     }
     setenv(LIBPATHENV, libpath, 1);
-    execv(BUILDDIR"/"STRINGIZE(RUBY_INSTALL_NAME), argv);
+
+    if (!(p = strrchr(arg0, '/'))) p = arg0; else p++;
+    if (strlen(p) < namesize - 1) {
+	argv[0] = malloc(p - arg0 + namesize);
+	memcpy(argv[0], arg0, p - arg0);
+	memcpy(argv[0] + (p - arg0), rubypath + dirsize, namesize);
+    }
+    else {
+	memcpy(p, rubyname, namesize);
+    }
+
+    execv(rubypath, argv);
     return -1;
 }

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