1 files changed, 45 insertions, 0 deletions
diff --git a/examples/manual/cat.lex b/examples/manual/cat.lex
new file mode 100644
index 0000000..7890aa2
--- /dev/null
+++ b/examples/manual/cat.lex
@@ -0,0 +1,45 @@
+/*
+ * cat.lex: A demonstration of YY_NEW_FILE.
+ */
+
+%{
+#include <stdio.h>
+
+char **names = NULL;
+int  current = 1;
+%}
+
+%%
+<<EOF>> {
+           current += 1;
+           if(names[current] != NULL){
+              yyin = fopen(names[current],"r");
+              if(yyin == NULL){
+                fprintf(stderr,"cat: unable to open %s\n",
+                        names[current]);
+                yyterminate();
+              }
+              YY_NEW_FILE;
+           } else {
+             yyterminate();
+           }
+        }
+%%
+
+int main(int argc, char **argv)
+{
+    if(argc < 2){
+       fprintf(stderr,"Usage: cat files....\n");
+       exit(1);
+    }
+    names = argv;
+
+    yyin = fopen(names[current],"r");
+    if(yyin == NULL){
+      fprintf(stderr,"cat: unable to open %s\n",
+              names[current]);
+      yyterminate();
+    }
+
+    yylex();
+}