Initial version of atoi

Functions to convert strings to integers in various bases

strint_test.asm

@@ -0,0 +1,86 @@
+mov r1, 1
+mov r2, test1
+mov r3, test1_end
+mov r13, test1_pass
+jmp atoi_test
+test1_pass:
+
+mov r1, 2
+mov r2, test2
+mov r3, test2_end
+mov r13, test2_pass
+jmp atoi_test
+test2_pass:
+
+mov r1, 3
+mov r2, test3
+mov r3, test3_end
+mov r13, test3_pass
+jmp atoi_test
+test3_pass:
+
+mov r1, 4
+mov r2, test4
+mov r3, test4_end
+mov r13, test4_pass
+jmp atoi_test
+test4_pass:
+
+mov r1, 5
+mov r2, test5
+mov r3, test5_end
+mov r13, test5_pass
+jmp atoi_test
+test5_pass:
+
+success:
+jmp success
+
+; test strint.fn_atoi
+; Arguments:
+; r1 - test number
+; r2 - test data label
+; r3 - test end-of-string label
+; Result:
+; void. Hangs in failure: on failure.
+; Clobbers:
+; r8 - test number
+; r9 - Expected result in r1
+; r10 - Expected result in r2
+; Notes:
+; Depends on fn_atoi not clobbering r8-r10.
+atoi_test:
+mov r8, r1
+load_32 r9, [r2]
+add r1, r2, 4
+mov r10, r3
+push r13
+mov r13, atoi_test_ret
+jmp stdlib.strint.atoi
+atoi_test_ret:
+pop r13
+cmp r1, r9
+jne failure
+cmp r2, r10
+jne failure
+jmp r13
+
+failure:
+jmp failure
+
+test1: U32 0 "0"
+test1_end: "\0"
+
+test2: U32 1 "1"
+test2_end: "\0"
+
+test3: U32 2 "2"
+test3_end: "\0"
+
+test4: U32 42 "42"
+test4_end: "\0"
+
+test5: U32 67 "67"
+test5_end: "lol"
+
+include stdlib