touch.c

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#include <types.h>
 
__start int main() {
    char* param1 = NULL;
    char* param2 = NULL;
    for(int i = 0; * (char*)(0x80 + i) != 0; i++) {
        if(*(char*)(0x80 + i) == ' ') {
            *(char*)(0x80 + i) = 0;
            param1 = 0x80;
            if(*(char*)(0x81 + i) != 0)
                param2 = 0x81 + i;
            break;
        }
    }
    if(param2 == NULL)
        return -1;
 
    char pows[] = {1, 10, 100};
    size_t num = 0;
    size_t size = 0;
    for(; param2[size] != 0; size++) {}
    size--;
 
    for(size_t i = 0; param2[i] != 0; i++)
        num += pows[size - i] * (param2[i] - '0');
 
    int ret = 1;
    asm("int 0x21":"=a"(ret):"a"(0x0400), "b"(param1), "c"(num));
 
    return (ret > 0 ? 0 : ret);
}