Imported Upstream version 2.5.31

1 files changed, 30 insertions, 0 deletions

diff --git a/examples/manual/userinit.lex b/examples/manual/userinit.lex
new file mode 100644
index 0000000..9a56471
--- /dev/null
+++ b/examples/manual/userinit.lex
@@ -0,0 +1,30 @@
+%{
+#define YY_USER_INIT open_input_file()
+
+extern FILE *yyin;
+
+void open_input_file(void)
+{
+  char *file_name,buffer[1024];
+
+  yyin      = NULL; 
+
+  while(yyin == NULL){
+    printf("Input file: ");
+    file_name = fgets(buffer,1024,stdin);
+    if(file_name){
+      file_name[strlen(file_name)-1] = '\0';
+      yyin = fopen(file_name,"r");
+      if(yyin == NULL){
+        printf("Unable to open \"%s\"\n",file_name);
+      }
+    } else {
+      printf("stdin\n");
+      yyin = stdin;
+      break;
+    }
+  }
+}
+
+%}
+%%