builtin: Fix handling of trailing IFS white spaces

The read built-in does not handle trailing IFS white spaces in
the right way, when there are more fields than variables.  Part
of the problem is that this case is handled outside of ifsbreakup.

Harald van Dijk wrote a patch to fix this by moving the magic
into ifsbreakup itself.

This patch further reorganises the ifsbreakup loop by having only
one loop over the whole string.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Harald van Dijk <harald@gigawatt.nl>

1 files changed, 4 insertions, 26 deletions

diff --git a/src/miscbltin.c b/src/miscbltin.c
index b596fd2..39b9c47 100644
--- a/src/miscbltin.c
+++ b/src/miscbltin.c
@@ -67,28 +67,21 @@
  *  less fields than variables -> remaining variables unset.
  *
  *  @param line complete line of input
+ *  @param ac argument count
  *  @param ap argument (variable) list
  *  @param len length of line including trailing '\0'
  */
 static void
-readcmd_handle_line(char *s, char **ap)
+readcmd_handle_line(char *s, int ac, char **ap)
 {
 	struct arglist arglist;
 	struct strlist *sl;
-	char *backup;
-	char *line;
 
-	/* ifsbreakup will fiddle with stack region... */
-	line = stackblock();
 	s = grabstackstr(s);
 
-	/* need a copy, so that delimiters aren't lost
-	 * in case there are more fields than variables */
-	backup = sstrdup(line);
-
 	arglist.lastp = &arglist.list;
 	
-	ifsbreakup(s, &arglist);
+	ifsbreakup(s, ac, &arglist);
 	*arglist.lastp = NULL;
 	ifsfree();
 
@@ -104,21 +97,6 @@ readcmd_handle_line(char *s, char **ap)
 			return;
 		}
 
-		/* remaining fields present, but no variables left. */
-		if (!ap[1] && sl->next) {
-			size_t offset;
-			char *remainder;
-
-			/* FIXME little bit hacky, assuming that ifsbreakup 
-			 * will not modify the length of the string */
-			offset = sl->text - s;
-			remainder = backup + offset;
-			rmescapes(remainder);
-			setvar(*ap, remainder, 0);
-
-			return;
-		}
-		
 		/* set variable to field */
 		rmescapes(sl->text);
 		setvar(*ap, sl->text, 0);
@@ -211,7 +189,7 @@ start:
 out:
 	recordregion(startloc, p - (char *)stackblock(), 0);
 	STACKSTRNUL(p);
-	readcmd_handle_line(p + 1, ap);
+	readcmd_handle_line(p + 1, argc - (ap - argv), ap);
 	return status;
 }