First attempt at sql engine

src/sql/main.c

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <readline.h>
+#include <string.h>
+#include "mdbsql.h"
+
+extern MdbSQL *g_sql;
+
+char *g_input_ptr;
+
+int mdb_sql_yyinput(char *buf, int need)
+{
+int cplen, have;
+
+	have = strlen(g_input_ptr);
+	cplen = need > have ? have : need;
+	
+	if (cplen>0) {
+		memcpy(buf, g_input_ptr, cplen);
+		g_input_ptr += cplen;
+	} 
+	return cplen;
+}
+
+int parse(char *buf)
+{
+	g_input_ptr = buf;
+	if (yyparse()) {
+		fprintf(stderr, "Couldn't parse SQL\n");
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+main()
+{
+char *s;
+char prompt[20];
+int line = 1;
+char *mybuf;
+int bufsz = 4096;
+int done = 0;
+
+	/* initialize the SQL engine */
+	g_sql = mdb_sql_init();
+
+	/* give the buffer an initial size */
+	bufsz = 4096;
+	mybuf = (char *) malloc(bufsz);
+	mybuf[0]='\0';
+
+	sprintf(prompt,"1 => ");
+	s=readline(prompt);
+	while (!done) {
+		if (!strcmp(s,"go")) {
+			line = 0;
+			parse(mybuf);
+			mybuf[0]='\0';
+		} else if (!strcmp(s,"reset")) {
+			line = 0;
+			mybuf[0]='\0';
+		} else {
+			add_history(s);
+			strcat(mybuf,s);
+			/* preserve line numbering for the parser */
+			strcat(mybuf,"\n");
+		}
+		sprintf(prompt,"%d => ",++line);
+		free(s);
+		s=readline(prompt);
+		if (!strcmp(s,"exit") || !strcmp(s,"quit") || !strcmp(s,"bye")) {
+			done = 1;
+		}
+	}
+	mdb_sql_exit(g_sql);	
+}