implemented REG_ANCHORED execution flag

* So you can anchor executions of already compiled patterns.
  In principle REG_BOSONLY could also be handled by the same code.
* Required by SciTECO.
* Test suite has been fixed and extended.
  The test program now takes getopt() style short arguments to specify flags.

1 files changed, 6 insertions, 0 deletions

diff --git a/regexec.c b/regexec.c
index d047929..848d911 100644
--- a/regexec.c
+++ b/regexec.c
@@ -415,6 +415,9 @@ find(
 	if (end != NULL) {
 	    break;		/* NOTE BREAK OUT */
 	}
+	if (v->eflags & REG_ANCHORED) {
+	    break;		/* NOTE BREAK OUT */
+	}
     }
     assert(end != NULL);	/* search RE succeeded so loop should */
     freedfa(d);
@@ -578,6 +581,9 @@ cfindloop(
 		    estop = prevchr(v, end);
 		}
 	    }
+	    if (v->eflags & REG_ANCHORED) {
+		break;	/* NOTE BREAK OUT */
+	    }
 	}
     } while (close < v->stop);