From 5cd635b43821e30aa7e7bb5f496e9a6690f3fa32 Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Mon, 11 Dec 2023 21:20:11 +0100
Subject: [PATCH] Added .adv directive

---
 include/ulas.h |  4 ++++
 src/ulas.c     | 13 +++++++++++--
 tests/t0.s     |  2 +-
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/include/ulas.h b/include/ulas.h
index e220cf6..4c65f03 100644
--- a/include/ulas.h
+++ b/include/ulas.h
@@ -45,6 +45,7 @@
 #define ULAS_ASMSTR_INCBIN ".incbin"
 #define ULAS_ASMSTR_DEF ".def"
 #define ULAS_ASMSTR_CHKSM ".chksm"
+#define ULAS_ASMSTR_ADV ".adv"
 
 // configurable tokens
 #define ULAS_TOK_COMMENT ';'
@@ -370,6 +371,9 @@ enum ulas_asmdir {
   ULAS_ASMDIR_DEF,
   // inserts checksum into rom
   ULAS_ASMDIR_CHKSM,
+  // .adv <int>
+  // advance .org by n bytes without writing to rom
+  ULAS_ASMDIR_ADV,
 };
 
 // amount of registers
diff --git a/src/ulas.c b/src/ulas.c
index 666de32..0117150 100644
--- a/src/ulas.c
+++ b/src/ulas.c
@@ -2399,6 +2399,12 @@ int ulas_asmdirincbin(FILE *dst, const char **line, unsigned long n, int *rc) {
   return written;
 }
 
+int ulas_asmdiradv(FILE *dst, const char **line, unsigned long n, int *rc) {
+  ULAS_EVALEXPRS(ulas.address +=
+                         ulas_intexpr(line, strnlen(*line, n), rc));
+  return 0;
+}
+
 int ulas_asmline(FILE *dst, FILE *src, const char *line, unsigned long n) {
   // this buffer is written both to dst and to verbose output
   char outbuf[ULAS_OUTBUFMAX];
@@ -2437,11 +2443,11 @@ int ulas_asmline(FILE *dst, FILE *src, const char *line, unsigned long n) {
                              ULAS_ASMSTR_BYTE,   ULAS_ASMSTR_STR,
                              ULAS_ASMSTR_FILL,   ULAS_ASMSTR_PAD,
                              ULAS_ASMSTR_INCBIN, ULAS_ASMSTR_DEF,
-                             ULAS_ASMSTR_CHKSM,  NULL};
+                             ULAS_ASMSTR_CHKSM, ULAS_ASMSTR_ADV,  NULL};
     enum ulas_asmdir dirs[] = {
         ULAS_ASMDIR_ORG,    ULAS_ASMDIR_SET,  ULAS_ASMDIR_BYTE,
         ULAS_ASMDIR_STR,    ULAS_ASMDIR_FILL, ULAS_ASMDIR_PAD,
-        ULAS_ASMDIR_INCBIN, ULAS_ASMDIR_DEF,  ULAS_ASMDIR_CHKSM};
+        ULAS_ASMDIR_INCBIN, ULAS_ASMDIR_DEF,  ULAS_ASMDIR_CHKSM, ULAS_ASMDIR_ADV};
 
     enum ulas_asmdir dir = ULAS_ASMDIR_NONE;
 
@@ -2487,6 +2493,9 @@ int ulas_asmline(FILE *dst, FILE *src, const char *line, unsigned long n) {
       ulas_asmout(dst, &ulas.chksm, 1);
       other_writes += 1;
       break;
+    case ULAS_ASMDIR_ADV:
+      ulas_asmdiradv(dst, &line, n, &rc);
+      break;
     case ULAS_ASMDIR_PAD:
       // TODO: pad is the same as .fill n, $ - n
     case ULAS_ASMDIR_NONE:
diff --git a/tests/t0.s b/tests/t0.s
index 7bd61d4..e9206f1 100644
--- a/tests/t0.s
+++ b/tests/t0.s
@@ -101,6 +101,6 @@ l2:
 j1:
   jp j1
 .chksm
-
   ld [hl], a
+.adv 1
 l3: .db 1
-- 
2.30.2