begin implementing preprocessor to generate ROM files

src/preprocess.c

@@ -0,0 +1,58 @@
+/*
+  Pre-process the various assembly source files to create a single
+  file for assembly, that has everything where it needs to live.
+
+*/
+
+#include <stdio.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define DO_ERROR(X) { retVal=-1; fprintf(stderr,"%s:%d:%s():%s\n",__FILE__,__LINE__,__func__,X); break; }
+
+void usage(void)
+{
+  fprintf(stderr,"usage: preprocess [-d <directory>]\n");
+  
+}
+
+int main(int argc,char **argv)
+{
+
+  int retVal=0;
+  DIR *d=NULL;
+  char *directory=".";
+  struct dirent *de=NULL;
+  
+  do {
+    
+    int opt;
+
+    while ((opt=getopt(argc,argv,"d:")) != -1) {
+      switch(opt) {
+      case 'd': directory=optarg; break;
+      default:
+	usage();
+	exit(-1);
+      }
+    }
+    
+    d=opendir(directory);
+    if (!d) DO_ERROR("opendir() failed");
+
+    while((de=readdir(d))!=NULL) {
+      if (strlen(de->d_name)>2) {
+	if (!strcmp(&de->d_name[strlen(de->d_name)-2],".s")) {
+	  printf("%s\n",de->d_name);
+	}
+      }
+    }
+    
+  } while(0);
+
+  if (d) closedir(d);
+  return retVal;
+}