From 573ddaf6da9d06eecda354aa4b0e9d963d2c70d1 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Thu, 4 Feb 1993 00:58:10 +0000
Subject: Formerly job.c.~95~

---
 job.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 97 insertions(+), 2 deletions(-)

(limited to 'job.c')

diff --git a/job.c b/job.c
index 01044c0..a8ffe4e 100644
--- a/job.c
+++ b/job.c
@@ -690,8 +690,103 @@ new_job (file)
   /* Expand the command lines and store the results in LINES.  */
   lines = (char **) xmalloc (cmds->ncommand_lines * sizeof (char *));
   for (i = 0; i < cmds->ncommand_lines; ++i)
-    lines[i] = allocated_variable_expand_for_file (cmds->command_lines[i],
-						   file);
+    {
+      /* Collapse backslash-newline combinations that are inside variable
+	 or function references.  These are left alone by the parser so
+	 that they will appear in the echoing of commands (where they look
+	 nice); and collapsed by construct_command_argv when it tokenizes.
+	 But letting them survive inside function invocations loses because
+	 we don't want the functions to see them as part of the text.  */
+
+      char *in, *out, *ref;
+
+      /* IN points to where in the line we are scanning.
+	 OUT points to where in the line we are writing.
+	 When we collapse a backslash-newline combination,
+	 IN gets ahead out OUT.  */
+
+      in = out = cmds->command_lines[i];
+      while ((ref = index (in, '$')) != 0)
+	{
+	  ++ref;		/* Move past the $.  */
+
+	  if (out != in)
+	    /* Copy the text between the end of the last chunk
+	       we processed (where IN points) and the new chunk
+	       we are about to process (where REF points).  */
+	    bcopy (in, out, ref - in);
+
+	  /* Move both pointers past the boring stuff.  */
+	  out += ref - in;
+	  in = ref;
+
+	  if (*ref == '(' || *ref == '{')
+	    {
+	      char openparen = *ref;
+	      char closeparen = openparen == '(' ? ')' : '}';
+	      int count;
+	      char *p;
+
+	      *out++ = *in++;	/* Copy OPENPAREN.  */
+	      /* IN now points past the opening paren or brace.
+		 Count parens or braces until it is matched.  */
+	      count = 0;
+	      while (*in != '\0')
+		{
+		  if (*in == closeparen && --count < 0)
+		    break;
+		  else if (*in == '\\' && in[1] == '\n')
+		    {
+		      /* We have found a backslash-newline inside a
+			 variable or function reference.  Eat it and
+			 any following whitespace.  */
+
+		      int quoted = 0;
+		      for (p = in - 1; p > ref && *p == '\\'; --p)
+			quoted = !quoted;
+
+		      if (quoted)
+			/* There were two or more backslashes, so this is
+			   not really a continuation line.  We don't collapse
+			   the quoting backslashes here as is done in
+			   collapse_continuations, because the line will
+			   be collapsed again after expansion.  */
+			*out++ = *in++;
+		      else
+			{
+			  /* Skip the backslash, newline and
+			     any following whitespace.  */
+			  in = next_token (in + 2);
+
+			  /* Discard any preceding whitespace that has
+			     already been written to the output.  */
+			  while (out > ref && isblank (out[-1]))
+			    --out;
+
+			  /* Replace it all with a single space.  */
+			  *out++ = ' ';
+			}
+		    }
+		  else
+		    {
+		      if (*in == openparen)
+			++count;
+
+		      *out++ = *in++;
+		    }
+		}
+	    }
+	}
+
+      /* There are no more references in this line to worry about.
+	 Copy the remaining uninteresting text to the output.  */
+      if (out != in)
+	strcpy (out, in);
+
+      /* Finally, expand the line.  */
+      lines[i] = allocated_variable_expand_for_file (cmds->command_lines[i],
+						     file);
+    }
 
   /* Start the command sequence, record it in a new
      `struct child', and add that to the chain.  */
-- 
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