From caefbac9a9dd02a8bf4c113c5e4f19f43f98ffdb Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Wed, 20 Jan 1993 04:29:19 +0000
Subject: [PATCH] merge with 1.4

---
 lib/regex.c | 57 ++++++++++++++++++++++++++++++---------------------------
 1 file changed, 30 insertions(+), 27 deletions(-)

diff --git a/lib/regex.c b/lib/regex.c
index a0e4e8950..eda11b535 100644
--- a/lib/regex.c
+++ b/lib/regex.c
@@ -3,7 +3,7 @@
    (Implements POSIX draft P10003.2/D11.2, except for
    internationalization features.)
 
-   Copyright (C) 1985, 89, 90, 91, 92 Free Software Foundation, Inc.
+   Copyright (C) 1993 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -29,7 +29,7 @@
 /* We need this for `regex.h', and perhaps for the Emacs include files.  */
 #include <sys/types.h>
 
-#if defined (HAVE_CONFIG_H) || defined (emacs)
+#ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
@@ -2197,18 +2197,20 @@ compile_range (p_ptr, pend, translate, syntax, b)
   unsigned this_char;
 
   const char *p = *p_ptr;
+  int range_start, range_end;
   
-  /* Even though the pattern is a signed `char *', we need to fetch into
-     `unsigned char's.  Reason: if the high bit of the pattern character
-     is set, the range endpoints will be negative if we fetch into a
-     signed `char *'.  */
-  unsigned char range_end;
-  unsigned char range_start = p[-2];
-
   if (p == pend)
     return REG_ERANGE;
 
-  PATFETCH (range_end);
+  /* Even though the pattern is a signed `char *', we need to fetch
+     with unsigned char *'s; if the high bit of the pattern character
+     is set, the range endpoints will be negative if we fetch using a
+     signed char *.
+
+     We also want to fetch the endpoints without translating them; the 
+     appropriate translation is done in the bit-setting loop below.  */
+  range_start = ((unsigned char *) p)[-2];
+  range_end   = ((unsigned char *) p)[0];
 
   /* Have to increment the pointer into the pattern string, so the
      caller isn't still at the ending character.  */
@@ -3989,21 +3991,13 @@ re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)
 
             /* If we're at the end of the pattern, we can change.  */
             if (p2 == pend)
-              { /* But if we're also at the end of the string, we might
-                   as well skip changing anything.  For example, in `a+'
-                   against `a', we'll have already matched the `a', and
-                   I don't see the the point of changing the opcode,
-                   popping the failure point, finding out it fails, and
-                   then going into our endgame.  */
-                if (d == dend)
-                  {
-                    p = pend;
-                    DEBUG_PRINT1 ("  End of pattern & string => done.\n");
-                    continue;
-                  }
-                
+	      {
+		/* Consider what happens when matching ":\(.*\)"
+		   against ":/".  I don't really understand this code
+		   yet.  */
   	        p[-3] = (unsigned char) pop_failure_jump;
-                DEBUG_PRINT1 ("  End of pattern => pop_failure_jump.\n");
+                DEBUG_PRINT1
+                  ("  End of pattern: change to `pop_failure_jump'.\n");
               }
 
             else if ((re_opcode_t) *p2 == exactn
@@ -4875,9 +4869,18 @@ regerror (errcode, preg, errbuf, errbuf_size)
     char *errbuf;
     size_t errbuf_size;
 {
-  const char *msg
-    = re_error_msg[errcode] == NULL ? "Success" : re_error_msg[errcode];
-  size_t msg_size = strlen (msg) + 1; /* Includes the null.  */
+  const char *msg;
+  size_t msg_size;
+
+  if (errcode < 0
+      || errcode >= (sizeof (re_error_msg) / sizeof (re_error_msg[0])))
+    /* Only error codes returned by the rest of the code should be passed 
+       to this routine.  If we are given anything else, or if other regex
+       code generates an invalid error code, then the program has a bug.
+       Dump core so we can fix it.  */
+    abort ();
+
+  msg_size = strlen (msg) + 1; /* Includes the null.  */
   
   if (errbuf_size != 0)
     {
-- 
2.11.0