From da2ea1ea7fc919e2b8bcc8f5d9073e45b539fa3c Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Mon, 25 Jul 1994 23:06:00 +0000
Subject: (expand_function: `shell') [__MSDOS__]: Wholly new implementation.

---
 function.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/function.c b/function.c
index 9353a91..ad8e06b 100644
--- a/function.c
+++ b/function.c
@@ -22,6 +22,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include "commands.h"
 #include "job.h"
 
+#ifdef __MSDOS__
+#include <process.h>
+#endif
+
 static char *string_glob ();
 
 /* Store into VARIABLE_BUFFER at O the result of scanning TEXT and replacing
@@ -371,6 +375,7 @@ expand_function (o, function, text, end)
 	else
 	  error_prefix = "";
 
+#ifndef	  __MSDOS__
 	if (pipe (pipedes) < 0)
 	  {
 	    perror_with_name (error_prefix, "pipe");
@@ -475,6 +480,69 @@ expand_function (o, function, text, end)
 
 	    free (buffer);
 	  }
+#else	/* MSDOS.  */
+         {
+	   /* MS-DOS can't do fork, but it can do spawn.  However, this
+	      means that we don't have an opportunity to reopen stdout to
+	      trap it.  Thus, we save our own stdout onto a new descriptor
+	      and dup a temp file's descriptor onto our stdout temporarily.
+	      After we spawn the shell program, we dup our own stdout back
+	      to the stdout descriptor.  The buffer reading is the same as
+	      above, except that we're now reading from a file.  */
+
+	   int save_stdout;
+	   int child_stdout;
+	   char tmp_output[FILENAME_MAX];
+	   FILE *child_stream;
+	   unsigned int maxlen = 200;
+	   int cc;
+	   char *buffer;
+ 
+	   strcpy (tmp_output, "shXXXXXX");
+	   mktemp (tmp_output);
+	   child_stdout = open (tmp_output,
+				O_WRONLY|O_CREAT|O_TRUNC|O_TEXT, 0644);
+	   save_stdout = dup (1);
+	   dup2 (child_stdout, 1);
+	   spawnvp (P_WAIT, argv[0], argv);
+	   dup2 (save_stdout, 1);
+	   close (child_stdout);
+	   close (save_stdout);
+ 
+	   child_stdout = open (tmp_output, O_RDONLY|O_TEXT, 0644);
+ 
+	   buffer = xmalloc (maxlen);
+	   i = 0;
+	   do
+	     {
+	       if (i == maxlen)
+		 {
+		   maxlen += 512;
+		   buffer = (char *) xrealloc (buffer, maxlen + 1);
+		 }
+ 
+	       cc = read (child_stdout, &buffer[i], maxlen - i);
+	       if (cc > 0)
+		 i += cc;
+	     } while (cc > 0);
+ 
+	   close (child_stdout);
+	   unlink (tmp_output);
+ 
+	   if (i > 0)
+	     {
+	       if (buffer[i - 1] == '\n')
+		 buffer[--i] = '\0';
+	       else
+		 buffer[i] = '\0';
+	       p = buffer;
+	       while ((p = index (p, '\n')) != 0)
+		 *p++ = ' ';
+	       o = variable_buffer_output (o, buffer, i);
+	     }
+	   free (buffer);
+	 }
+#endif	/* Not MSDOS.  */
 
 	free (text);
 	break;
-- 
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