*** empty log message ***

[gnulib.git] / regex.c

diff --git a/regex.c b/regex.c
index 3b4eb50..df1b0b6 100644 (file)
--- a/regex.c
+++ b/regex.c
@@ -3208,7 +3208,12 @@ at_begline_loc_p (pattern, p, syntax)
        /* After a subexpression?  */
        (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash))
        /* After an alternative?         */
-    || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash));
+    || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash))
+       /* After a shy subexpression?  */
+    || ((syntax & RE_SHY_GROUPS) && prev - 2 >= pattern
+       && prev[-1] == '?' && prev[-2] == '('
+       && (syntax & RE_NO_BK_PARENS
+           || (prev - 3 >= pattern && prev[-3] == '\\')));
 }
 
 
@@ -3947,6 +3952,16 @@ static int bcmp_translate _RE_ARGS((re_char *s1, re_char *s2,
       dend = end_match_2;                                              \
     }
 
+/* Call before fetching a char with *d if you already checked other limits.
+   This is meant for use in lookahead operations like wordend, etc..
+   where we might need to look at parts of the string that might be
+   outside of the LIMITs (i.e past `stop').  */
+#define PREFETCH_NOLIMIT()                                             \
+  if (d == end1)                                                       \
+     {                                                                 \
+       d = string2;                                                    \
+       dend = end_match_2;                                             \
+     }                                                                 \
 
 /* Test if at very beginning or at very end of the virtual concatenation
    of `string1' and `string2'. If only one string, it's `string2'.  */
@@ -4492,7 +4507,7 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
     }
   else
     {
-      if (stop <= size1)
+      if (stop < size1)
        {
          /* Only match within string1.  */
          end_match_1 = string1 + stop;
@@ -4507,7 +4522,9 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
          end_match_2 = end_match_1;
        }
       else
-       {
+       { /* It's important to use this code when stop == size so that
+            moving `d' from end1 to string2 will not prevent the d == dend
+            check from catching the end of string.  */
          end_match_1 = end1;
          end_match_2 = string2 + stop - size1;
        }
@@ -5009,12 +5026,11 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
            {
              if (!bufp->not_eol) break;
            }
-
-         /* We have to ``prefetch'' the next character.  */
-         else if ((d == end1 ? *string2 : *d) == '\n'
-                  && bufp->newline_anchor)
+         else
            {
-             break;
+             PREFETCH_NOLIMIT ();
+             if (*d == '\n' && bufp->newline_anchor)
+               break;
            }
          goto fail;
 
@@ -5249,7 +5265,7 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
 #ifdef emacs
              UPDATE_SYNTAX_TABLE_FORWARD (charpos + 1);
 #endif
-             PREFETCH ();
+             PREFETCH_NOLIMIT ();
              c2 = RE_STRING_CHAR (d, dend - d);
              s2 = SYNTAX (c2);
 
@@ -5336,7 +5352,7 @@ re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
              /* Case 3: D is not at the end of string ... */
              if (!AT_STRINGS_END (d))
                {
-                 PREFETCH ();
+                 PREFETCH_NOLIMIT ();
                  c2 = RE_STRING_CHAR (d, dend - d);
 #ifdef emacs
                  UPDATE_SYNTAX_TABLE_FORWARD (charpos);