Added support for character escape sequence '\0'. Closes #642

src/main/java/dk/camelot64/kickc/model/values/StringEncoding.java

@@ -165,6 +165,8 @@ public enum StringEncoding {
             return '\r';
          case 'f':
             return '\f';
+         case '0':
+            return '\0';
          case '"':
             return '"';
          case '\'':
@@ -205,6 +207,8 @@ public enum StringEncoding {
             return "\\r";
          case '\f':
             return "\\f";
+         case '\0':
+            return "\\$00";
          case '\"':
             return "\\\"";
          case '\'':

src/test/java/dk/camelot64/kickc/test/TestProgramsFast.java

@@ -1531,6 +1531,11 @@ public class TestProgramsFast extends TestPrograms {
       assertError("string-escapes-err-0.c", "Unfinished string escape sequence at end of string");
    }
 
+   @Test
+   public void testStringEscapes7() throws IOException {
+      compileAndCompare("string-escapes-6.c");
+   }
+
    @Test
    public void testStringEscapes5() throws IOException {
       compileAndCompare("string-escapes-5.c");

src/test/kc/string-escapes-6.c

@@ -0,0 +1,18 @@
+// Test using some simple supported string escape
+// Uses \0 to add null-characters
+
+char MESSAGE[] = "a\0bb\0ccc\0";
+
+char * const SCREEN = (char*)0x0400;
+
+void main() {
+    char i=0;
+    while(MESSAGE[i]) {
+        while(MESSAGE[i]) {
+            SCREEN[i] = MESSAGE[i];
+            i++;
+        }
+        SCREEN[i] = ' ';
+        i++;
+    }
+}

src/test/ref/string-escapes-6.asm

@@ -0,0 +1,43 @@
+// Test using some simple supported string escape
+// Uses \0 to add null-characters
+  // Commodore 64 PRG executable file
+.file [name="string-escapes-6.prg", type="prg", segments="Program"]
+.segmentdef Program [segments="Basic, Code, Data"]
+.segmentdef Basic [start=$0801]
+.segmentdef Code [start=$80d]
+.segmentdef Data [startAfter="Code"]
+.segment Basic
+:BasicUpstart(main)
+  .label SCREEN = $400
+.segment Code
+main: {
+    ldx #0
+  __b1:
+    // while(MESSAGE[i])
+    lda MESSAGE,x
+    cmp #0
+    bne __b2
+    // }
+    rts
+  __b2:
+    // while(MESSAGE[i])
+    lda MESSAGE,x
+    cmp #0
+    bne __b3
+    // SCREEN[i] = ' '
+    lda #' '
+    sta SCREEN,x
+    // i++;
+    inx
+    jmp __b1
+  __b3:
+    // SCREEN[i] = MESSAGE[i]
+    lda MESSAGE,x
+    sta SCREEN,x
+    // i++;
+    inx
+    jmp __b2
+}
+.segment Data
+  MESSAGE: .text @"a\$00bb\$00ccc\$00"
+  .byte 0

src/test/ref/string-escapes-6.cfg

@@ -0,0 +1,24 @@
+
+void main()
+main: scope:[main]  from
+  [0] phi()
+  to:main::@1
+main::@1: scope:[main]  from main main::@4
+  [1] main::i#3 = phi( main/0, main::@4/main::i#2 )
+  [2] if(0!=MESSAGE[main::i#3]) goto main::@2
+  to:main::@return
+main::@return: scope:[main]  from main::@1
+  [3] return 
+  to:@return
+main::@2: scope:[main]  from main::@1 main::@3
+  [4] main::i#4 = phi( main::@1/main::i#3, main::@3/main::i#1 )
+  [5] if(0!=MESSAGE[main::i#4]) goto main::@3
+  to:main::@4
+main::@4: scope:[main]  from main::@2
+  [6] SCREEN[main::i#4] = ' '
+  [7] main::i#2 = ++ main::i#4
+  to:main::@1
+main::@3: scope:[main]  from main::@2
+  [8] SCREEN[main::i#4] = MESSAGE[main::i#4]
+  [9] main::i#1 = ++ main::i#4
+  to:main::@2