Add some cases, fix an octal bug

strint.asm

@@ -101,7 +101,7 @@ atoi_oct_loop:
 load_8 r3, [r2]
 cmp r3, 0x30 ; '0'
 jl atoi_done
-cmp r3, 0x39 ; '7'
+cmp r3, 0x37 ; '7'
 jg atoi_done
 add r2, r2, 1
 sub r3, r3, 0x30 ; '0'

strint_test.asm

@@ -33,10 +33,24 @@ mov r13, test5_pass
 jmp atoi_test
 test5_pass:
 
+mov r1, 6
+mov r2, test6
+mov r3, test6_end
+mov r13, test6_pass
+jmp atoi_test
+test6_pass:
+
+mov r1, 7
+mov r2, test7
+mov r3, test7_end
+mov r13, test7_pass
+jmp atoi_test
+test7_pass:
+
 success:
 jmp success
 
-; test strint.fn_atoi
+; test strint.atoi
 ; Arguments:
 ; r1 - test number
 ; r2 - test data label
@@ -48,7 +62,7 @@ jmp success
 ; r9 - Expected result in r1
 ; r10 - Expected result in r2
 ; Notes:
-; Depends on fn_atoi not clobbering r8-r10.
+; Depends on atoi not clobbering r8-r10.
 atoi_test:
 mov r8, r1
 load_32 r9, [r2]
@@ -81,6 +95,13 @@ test4: U32 42 "42"
 test4_end: "\0"
 
 test5: U32 67 "67"
-test5_end: "lol"
+test5_end: "lol\0"
+
+test6: U32 1690 "0x69a"
+test6_end: "\0"
+
+test7: U32 19 "023"
+test7_end: "9\0"
+
 
 include stdlib