path: root/yotlibc/strbasic.c

#include "yotlibc.h"

int strcmp(s1, s2)
    char* s1;
    char* s2;
{
    char* str1;
    char* str2;
    if((*s1 | *s2) && (!*s1 || !*s2)){
        if(*s1){
            return 1;
        }else{
            return -1;
        }
    }
    for(str1=s1, str2=s2; *str1 != '\0' && *str2 != '\0'; str1++, str2++){
        if(*str1 > *str2){
            return 2;
        }else if(*str1 < *str2){
            return -2;
        }
    }
    if(*str1 != '\0'){
        return 3;
    }
    if(*str2 != '\0'){
        return -3;
    }
    return 0;
}

int strtos(str, store)
    char* str;
    unsigned int* store;
{
    unsigned int result = 0;
    bool ishex = false;
    if(*str == '0' && (*(str+1) == 'x' || *(str+1) == 'X')){
        str += 2;
        ishex = true;
    }
    for(; *str != '\0'; str++){
        if(*str >= '0' && *str <= '9'){
            if(ishex){
                result <<= 4;
                result += *str - '0';
            }else{
                result *= 10;
                result += *str - '0';
            }
        }else if(*str >= 'A' && *str <= 'F'){
            if(ishex){
                result <<= 4;
                result += *str - 'A' + 10;
            }else{
                return 0;
            }
        }else if(*str >= 'a' && *str <= 'f'){
            if(ishex){
                result <<= 4;
                result += *str - 'a' + 10;
            }else{
                return 0;
            }
        }else if(*str == ' ' || *str == '\t' || *str == '\n'){
            break;
        }else{
            return 0; /* Failed */
        }
    }
    *store = result;
    return 1;  /* OK */
}