From c5c1a0e2cec46f2fe02e5ab762fe5d8bd702e874 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Thu, 22 Feb 2024 07:04:29 +0100
Subject: [PATCH] WIP: added -a option. Fixed missing break when adding incpath

---
 src/main.c  | 11 +++++++++--
 src/ulas.c  |  2 +-
 src/ulas.h  |  2 ++
 src/uldas.c |  3 +++
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/main.c b/src/main.c
index b346ffb..3386281 100644
--- a/src/main.c
+++ b/src/main.c
@@ -23,7 +23,7 @@
 #define ULAS_OPTS "hvVpd"
 
 // args with value
-#define ULAS_OPTS_ARG "o:l:s:i:w:"
+#define ULAS_OPTS_ARG "o:l:s:i:w:a:"
 
 #define ULAS_HELP(a, desc) printf("\t-%s\t%s\n", (a), desc);
 
@@ -34,7 +34,9 @@ unsigned long incpathslen = 0;
 
 void ulas_help(void) {
   printf("%s\n", ULAS_NAME);
-  printf("Usage %s [-%s] [-o=path] [input]\n\n", ULAS_NAME, ULAS_OPTS);
+  printf("Usage %s [-%s] [-o=path] [-i=path] [-l=path] [-a=initial-address] "
+         "[input]\n\n",
+         ULAS_NAME, ULAS_OPTS);
   ULAS_HELP("h", "display this help and exit");
   ULAS_HELP("V", "display version info and exit");
   ULAS_HELP("v", "verbose output");
@@ -43,6 +45,7 @@ void ulas_help(void) {
   ULAS_HELP("l=path", "Listing file");
   ULAS_HELP("s=path", "Symbols file");
   ULAS_HELP("i=path", "Add include search path");
+  ULAS_HELP("a=initial-address", "Initial starting address");
   ULAS_HELP("d", "Disassemble a file");
   ULAS_HELP("w=warning", "Toggle warnings: a=all, o=overflow");
 }
@@ -84,6 +87,10 @@ void ulas_getopt(int argc, char **argv, struct ulas_config *cfg) {
     case 'i':
       assert(incpathslen < ULAS_INCPATHSMAX);
       incpaths[incpathslen++] = strndup(optarg, ULAS_PATHMAX);
+      break;
+    case 'a':
+      cfg->org = strtol(optarg, NULL, 0);
+      break;
     case 'w':
       cfg->warn_level ^= warnings[(int)optarg[0]];
       break;
diff --git a/src/ulas.c b/src/ulas.c
index ef62a7b..46d10aa 100644
--- a/src/ulas.c
+++ b/src/ulas.c
@@ -56,7 +56,7 @@ void ulas_nextpass(void) {
   ulas.scope = 1;
   ulas.line = 0;
   ulas.icntr = 0;
-  ulas.address = 0;
+  ulas.address = ulascfg.org;
   ulas.chksm = 0;
   ulas.filename = ulas.initial_filename;
 
diff --git a/src/ulas.h b/src/ulas.h
index 29c28c2..616c982 100644
--- a/src/ulas.h
+++ b/src/ulas.h
@@ -132,6 +132,8 @@ struct ulas_config {
   int preproc_only;
   int disas;
 
+  unsigned int org;
+
   // all include search paths
   char **incpaths;
   unsigned int incpathslen;
diff --git a/src/uldas.c b/src/uldas.c
index 5202b1b..09be3b8 100644
--- a/src/uldas.c
+++ b/src/uldas.c
@@ -3,6 +3,9 @@
 int ulas_dasm(FILE *src, FILE *dst) {
   // pass 1: run and collect labels 
   // pass 2: run and output to file
+  
+  // TODO: the instruction list should be sorted so we can search it faster
+  // but for now we just do it as a linear search
 
   return 0;
 }
-- 
2.30.2