systemlib.c

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/*********************************************************
* Function: system library
*
* File: systemlib.c
* Author: Book Chen
* Date 2009.07.06
***********************************************************
*/
#include "includes.h"

INT8U ucTemp;
/*****************
* SystemlibAscii2HexNumberGet:
* converts string to unsigned long (32 bit)
******************
*/
INT32U SystemlibAscii2HexNumberGet(INT8U *pString){
    INT8U i,j;
    INT32U k;
    INT8U *pData;

    if(pString==(INT8U *)0) return 0; // null string pointer
    pData=pString;
    for(i=0;i<9;i++) if(*pData++==0) break;
    if((i==0)||(i==9)) return 0; // string too large
    k=0;
    if(i==8){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<28;
        i--; 
    } 
    if(i==7){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<24; 
        i--;
    } 
    if(i==6){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<20; 
        i--;
    } 
    if(i==5){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<16; 
        i--;
    } 
    if(i==4){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<12; 
        i--;
    } 
    if(i==3){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<8; 
        i--;
    } 
    if(i==2){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j<<4; 
        i--;
    } 
    if(i==1){
        j=*pString++;
        if((j>='0')&&(j<='9')) j=j-'0';
        else if((j>='a')&&(j<='f')) j=j-'a'+10;
        else if((j>='A')&&(j<='F')) j=j-'A'+10;
        else return 0; // invalid char
        k+=(INT32U)j; 
    } 
    return k;
}
/*****************
* SystemlibHex2AsciiCharGet:
* converts a hex digit to ascii
******************
*/
INT8U SystemlibHex2AsciiCharGet(INT8U Data){
    //if((Data>=0)&&(Data<=9)) Data+=0x30;
    if(Data<=9) Data+=0x30;
    else if((Data>=10)&&(Data<=15)) Data+=55;
    else Data=0;
    return Data;
}
/*****************
* SystemlibStringLength:
* calculates string length
******************
*/
INT8U SystemlibStringLength(INT8U *pString){
     ucTemp=0;
     while(*pString!=0){
         pString++;
         ucTemp++;
     }
     return ucTemp;
}
/*****************
* SystemlibStringCopy:
* copy string to another string
******************
*/
void SystemlibStringCopy(INT8U *pSource,INT8U *pDestination){
    while(*pSource!=0){
        *pDestination=*pSource;
        pSource++;
        pDestination++;
    }
}

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