1 files changed, 120 insertions, 0 deletions
diff --git a/src/kash/bltin/echo.c b/src/kash/bltin/echo.c
new file mode 100644
index 0000000..ba778b1
--- /dev/null
+++ b/src/kash/bltin/echo.c
@@ -0,0 +1,120 @@
+/*	$NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $	*/
+
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * 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. 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.
+ *
+ *	@(#)echo.c	8.1 (Berkeley) 5/31/93
+ */
+
+/*
+ * Echo command.
+ *
+ * echo is steeped in tradition - several of them!
+ * netbsd has supported 'echo [-n | -e] args' in spite of -e not being
+ * documented anywhere.
+ * Posix requires that -n be supported, output from strings containing
+ * \ is implementation defined
+ * The Single Unix Spec requires that \ escapes be treated as if -e
+ * were set, but that -n not be treated as an option.
+ * (ksh supports 'echo [-eEn] args', but not -- so that it is actually
+ * impossible to actually output '-n')
+ *
+ * It is suggested that 'printf "%b" "string"' be used to get \ sequences
+ * expanded.  printf is now a builtin of netbsd's sh and csh.
+ */
+
+#include "shinstance.h"
+#include "builtins.h"
+
+int
+echocmd(shinstance *psh, int argc, char **argv)
+{
+	char **ap;
+	const char *p;
+	int nflag = 0;
+	int eflag = 0;
+
+	ap = argv;
+	if (argc)
+		ap++;
+
+	if ((p = *ap) != NULL && *p == '-') {
+		if (p[1] == 'n' && !p[2]) {
+			nflag = 1;
+			ap++;
+		} else if (p[1] == 'e' && !p[2]) {
+			eflag = 1;
+			ap++;
+		}
+	}
+
+	while ((p = *ap++) != NULL) {
+		if (!eflag) {
+			out1str(psh, p);
+		} else {
+			char c;
+			int count;
+
+			while ((c = *p++) != '\0') {
+				if (c == '\\') {
+					switch (*p++) {
+					case 'a':  c = '\a';  break;	/* bell */
+					case 'b':  c = '\b';  break;
+					case 'c':  return 0;		/* exit */
+					case 'e':  c =  033;  break;	/* escape */
+					case 'f':  c = '\f';  break;
+					case 'n':  c = '\n';  break;
+					case 'r':  c = '\r';  break;
+					case 't':  c = '\t';  break;
+					case 'v':  c = '\v';  break;
+					case '\\':  break;		/* c = '\\' */
+					case '0':
+						c = 0;
+						count = 3;
+						while (--count >= 0 && (unsigned)(*p - '0') < 8)
+							c = (c << 3) + (*p++ - '0');
+						break;
+					default:
+						/* Output the '/' and char following */
+						p--;
+						break;
+					}
+				}
+				out1c(psh, c);
+			}
+		}
+		if (*ap)
+			out1c(psh, ' ');
+	}
+	if (! nflag)
+		out1c(psh, '\n');
+	return 0;
+}