Added a quoted-token parsing function.

testcode/lib/strqtok-test.c

@@ -0,0 +1,49 @@
+/* strqtok-test.c
+**
+** 2014-05-20, Greg King
+**
+** This program tests that strqtok() correctly will parse strings
+** with quotation marks in them.  It should show this list of tokens
+** from the test strings:
+**
+** >This<
+** >  is only    <
+** >a<
+** >short<
+** >quoting<
+** >test ,  honoring  blanks, commas<
+** >and<
+** >(4)<
+** >empty<
+** ><
+** ><
+** ><
+** ><
+** >strings,   EOT  <
+**
+** It shouldn"t show
+**
+** >Bogus token<
+*/
+
+#include <string.h>
+#include <stdio.h>
+
+void main(void)
+{
+    /* b[] and s[] are declared as automatic, not static, variables
+    ** because strqtok() will change them.
+    ** They must be defined together; and, b[] must be defined first
+    ** (because they're copied onto the top-down stack).
+    */
+    char b[] = "Bogus token ";
+    char s[] = "  This ,  \"  is only    \"a   short   "
+        "quoting\"test ,  honoring  blanks"
+        ", commas\", and (4) empty \"\"\"\"\"\"\"\" \"strings,   EOT  ";
+    char *t = strqtok(s, " ,");
+
+    while (t != NULL) {
+        printf(">%s<\n", t);
+        t = strqtok(NULL, " ,");
+    }
+}