1 files changed, 64 insertions, 0 deletions
diff --git a/yacc.c b/yacc.c
new file mode 100644
index 0000000..75f1fc1
--- /dev/null
+++ b/yacc.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#define C_ID_FIRSTCHAR "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+int main(int argc, char *argv[])
+{
+	char *fileprefix = "y";
+	char *symbolprefix = "yy";
+	int header = 0;
+	int lines = 1;
+	int debug = 0;
+	int verbose = 0;
+	int c;
+
+	while ((c = getopt(argc, argv, "bdlptv")) != -1) {
+		switch (c) {
+		case 'b':
+			/* Change file prefix */
+			fileprefix = optarg;
+			break;
+
+		case 'd':
+			/* Write a header file */
+			header = 1;
+			break;
+
+		case 'l':
+			/* Omit #line directives */
+			lines = 0;
+			break;
+
+		case 'p':
+			/* Change symbol prefix */
+			symbolprefix = optarg;
+			if (!strchr(C_ID_FIRSTCHAR, *symbolprefix)) {
+				printf("'%s' is not a valid prefix\n", optarg);
+				return 1;
+			}
+			break;
+
+		case 't':
+			/* Include debugging code */
+			debug = 1;
+			break;
+
+		case 'v':
+			/* Output a description file */
+			verbose = 1;
+			break;
+			
+		default:
+			return 1;
+		}
+	}
+
+	if (optind != argc - 1) {
+		fprintf(stderr, "Must specify exactly one grammar file\n");
+		return 1;
+	}
+
+	return 0;
+}