Assembly input validation

On my assembly program I request several integer input's from the user. However even if I enter a character, string or nothing at all, the program continues with execution.

How can i validate whether the user actually entered an integer and not something else.

Answer can be Assemb开发者_开发技巧ly syntax agnostic

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In this particular case using MIPS. The system call that performs the service "InputDialogIn" returns in register $a1 a status value, depending on the input.

• 0: OK status
• -1: Input cannot be parsed
• -2: Cancel was chosen
• -3: OK button selected, yet, no data input onto field

Therefore using the value in op beq to $zero, validates the input successfully.

Note: Instruction/Syscall 51 "InputDialogIn", is exclusive to MARS simulator.

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There's a simple way to learn how this can be done - write that validation function in C and compile to assembler and try to map C constructs to what you see (GCC -S option, various -fdump-XXX switches allow to annotate assembler code).