1 files changed, 156 insertions, 0 deletions
diff --git a/bin/ed/re.c b/bin/ed/re.c
new file mode 100644
index 0000000..462c816
--- /dev/null
+++ b/bin/ed/re.c
@@ -0,0 +1,156 @@
+/* re.c: This file contains the regular expression interface routines for
+   the ed line editor. */
+/*-
+ * Copyright (c) 1993 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley
+ * by Andrew Moore, Talke Studio.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)re.c	5.5 (Berkeley) 3/28/93";
+#endif /* not lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ed.h"
+
+extern char *lhbuf;
+extern int lhbufsz;
+extern char *ibufp;
+extern int ibufsz;
+extern int patlock;
+
+char errmsg[MAXFNAME + 40] = "";
+
+/* optpat: return pointer to compiled pattern from command buffer */
+pattern_t *
+optpat()
+{
+	static pattern_t *exp = NULL;
+
+	char *exps;
+	char delim;
+	int n;
+
+	if ((delim = *ibufp) == '\n') {
+		if (!exp) sprintf(errmsg, "no previous pattern");
+		return exp;
+	} else if (delim == ' ' || *++ibufp == '\n') {
+		sprintf(errmsg, "invalid pattern delimiter");
+		return NULL;
+	} else if (*ibufp == delim) {
+		sprintf(errmsg, "no previous pattern");
+		return exp;
+	} else if ((exps = getlhs(delim)) == NULL)
+		return NULL;
+	/* buffer alloc'd && not reserved */
+	if (exp && !patlock)
+		regfree(exp);
+	else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
+		fprintf(stderr, "%s\n", strerror(errno));
+		sprintf(errmsg, "out of memory");
+		return NULL;
+	}
+	patlock = 0;
+#ifdef GNU_REGEX
+	/* initialize pattern buffer */
+	exp->buffer = NULL;
+	exp->allocated = 0L;
+	exp->fastmap = 0;		/* not used by GNU regex after 0.12 */
+	exp->translate = 0;
+#endif
+	if (n = regcomp(exp, exps, 0)) {
+		regerror(n, exp, errmsg, sizeof errmsg);
+		return NULL;
+	}
+	return exp;
+}
+
+
+extern int isbinary;
+
+/* getlhs: copy a pattern string from the command buffer; return pointer
+   to the copy */
+char *
+getlhs(delim)
+	int delim;
+{
+	char *nd;
+	int len;
+
+	for (nd = ibufp; *nd != delim && *nd != '\n'; nd++)
+		switch (*nd) {
+		default:
+			break;
+		case '[':
+			if ((nd = ccl(++nd)) == NULL) {
+				sprintf(errmsg, "unbalanced brackets ([])");
+				return NULL;
+			}
+			break;
+		case '\\':
+			if (*++nd == '\n') {
+				sprintf(errmsg, "trailing backslash (\\)");
+				return NULL;
+			}
+			break;
+		}
+	len = nd - ibufp;
+	CKBUF(lhbuf, lhbufsz, len + 1, NULL);
+	memcpy(lhbuf, ibufp, len);
+	lhbuf[len] = '\0';
+	ibufp = nd;
+	return (isbinary) ? nultonl(lhbuf, len) : lhbuf;
+}
+
+
+/* ccl: expand a POSIX character class */
+char *
+ccl(s)
+	char *s;
+{
+	int c, d;
+
+	if (*s == '^')
+		s++;
+	if (*s == ']')
+		s++;
+	for (; *s != ']' && *s != '\n'; s++)
+		if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
+			for (s++, c = *++s; *s != ']' || c != d; s++)
+				if ((c = *s) == '\n')
+					return NULL;
+	return  (*s == ']') ? s : NULL;
+}