Imported Upstream version 93u+upstream

1 files changed, 81 insertions, 0 deletions

diff --git a/src/lib/libast/comp/re_comp.c b/src/lib/libast/comp/re_comp.c
new file mode 100644
index 0000000..ad31f24
--- /dev/null
+++ b/src/lib/libast/comp/re_comp.c
@@ -0,0 +1,81 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * re_comp implementation
+ */
+
+#include <ast.h>
+#include <re_comp.h>
+#include <regex.h>
+
+#undef	error
+#undef	valid
+
+static struct
+{
+	char	error[64];
+	regex_t	re;
+	int	valid;
+} state;
+
+char*
+re_comp(const char* pattern)
+{
+	register int	r;
+
+	if (!pattern || !*pattern)
+	{
+		if (state.valid)
+			return 0;
+		r = REG_BADPAT;
+	}
+	else
+	{
+		if (state.valid)
+		{
+			state.valid = 0;
+			regfree(&state.re);
+		}
+		if (!(r = regcomp(&state.re, pattern, REG_LENIENT|REG_NOSUB|REG_NULL)))
+		{
+			state.valid = 1;
+			return 0;
+		}
+	}
+	regerror(r, &state.re, state.error, sizeof(state.error));
+	return state.error;
+}
+
+int
+re_exec(const char* subject)
+{
+	if (state.valid && subject)
+		switch (regexec(&state.re, subject, 0, NiL, 0))
+		{
+		case 0:
+			return 1;
+		case REG_NOMATCH:
+			return 0;
+		}
+	return -1;
+}