Initial revision
diff --git a/Parser/pgenmain.c b/Parser/pgenmain.c
new file mode 100644
index 0000000..678be5d
--- /dev/null
+++ b/Parser/pgenmain.c
@@ -0,0 +1,111 @@
+/* Parser generator main program */
+
+#include <stdio.h>
+
+#include "PROTO.h"
+#include "grammar.h"
+#include "node.h"
+#include "parsetok.h"
+#include "pgen.h"
+
+int debugging;
+
+#ifdef THINK_C
+char *
+askfile()
+{
+ char buf[256];
+ static char name[256];
+ printf("Input file name: ");
+ if (fgets(buf, sizeof buf, stdin) == NULL) {
+ printf("EOF\n");
+ exit(1);
+ }
+ if (sscanf(buf, " %s ", name) != 1) {
+ printf("No file\n");
+ exit(1);
+ }
+ return name;
+}
+#endif
+
+grammar *
+getgrammar(filename)
+ char *filename;
+{
+ FILE *fp;
+ node *n;
+ grammar *g0, *g;
+
+ fp = fopen(filename, "r");
+ if (fp == NULL) {
+ perror(filename);
+ exit(1);
+ }
+ g0 = meta_grammar();
+ n = NULL;
+ parsefile(fp, g0, g0->g_start, (char *)NULL, (char *)NULL, &n);
+ fclose(fp);
+ if (n == NULL) {
+ fprintf(stderr, "Parsing error.\n");
+ exit(1);
+ }
+ g = pgen(n);
+ if (g == NULL) {
+ printf("Bad grammar.\n");
+ exit(1);
+ }
+ return g;
+}
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ grammar *g;
+ node *n;
+ FILE *fp;
+ char *filename;
+
+#ifdef THINK_C
+ filename = askfile();
+#else
+ if (argc != 2) {
+ fprintf(stderr, "usage: %s grammar\n", argv[0]);
+ exit(2);
+ }
+ filename = argv[1];
+#endif
+ g = getgrammar(filename);
+ fp = fopen("graminit.c", "w");
+ if (fp == NULL) {
+ perror("graminit.c");
+ exit(1);
+ }
+ printf("Writing graminit.c ...\n");
+ printgrammar(g, fp);
+ fclose(fp);
+ fp = fopen("graminit.h", "w");
+ if (fp == NULL) {
+ perror("graminit.h");
+ exit(1);
+ }
+ printf("Writing graminit.h ...\n");
+ printnonterminals(g, fp);
+ fclose(fp);
+ exit(0);
+}
+
+void
+fatal(msg)
+ char *msg;
+{
+ fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
+ exit(1);
+}
+
+/* TO DO:
+
+ - improve user interface
+ - check for duplicate definitions of names (instead of fatal err)
+*/