Add the "wordexp" shell built-in command which will be used to implement

the POSIX wordexp() function.

bin/sh/builtins.def

@@ -93,3 +93,4 @@ aliascmd	alias
 ulimitcmd	ulimit
 testcmd		test [
 bindcmd		bind
+wordexpcmd	wordexp

bin/sh/expand.c

@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <limits.h>
 #include <stdio.h>
+#include <string.h>
 
 /*
  * Routines to expand arguments to commands.  We have to deal with
@@ -1521,3 +1522,24 @@ cvtnum(int num, char *buf)
 		STPUTC(*p++, buf);
 	return buf;
 }
+
+/*
+ * Do most of the work for wordexp(3).
+ */
+
+int
+wordexpcmd(int argc, char **argv)
+{
+	size_t len;
+	int i;
+
+	out1fmt("%08x", argc - 1);
+	for (i = 1, len = 0; i < argc; i++)
+		len += strlen(argv[i]);
+	out1fmt("%08x", (int)len);
+	for (i = 1; i < argc; i++) {
+		out1str(argv[i]);
+		out1c('\0');
+	}
+        return (0);
+}

bin/sh/expand.h

@@ -65,3 +65,4 @@ void expari(int);
 int patmatch(char *, char *, int);
 void rmescapes(char *);
 int casematch(union node *, char *);
+int wordexpcmd(int, char **);