Thread: split strings by 2 ASCII Character

Hi guys,

I want to split strings that are not separated by tab, space or etc into 2 characters that will stored in array. The inputs are read from Srecords file.


example input data

Data [] = {"121AB2CD"}

and will be store like this,

Data [0]: 12 -> 18
Data [1]: AB -> 26
Data [2]: 2C -> 178
Data [3]: CD -> 205

Code:

#include<stdio.h>
#include<string.h>



int main(void)
{

Char st[10][20];
int temp[10];
int i,n=4;


printf("Please input ant ASCII no.:");
for(i=0; i<n; i++)
gets(st[i]); 


for(i=0; i<n; i++)
{
sscanf(temp, "%X", st[i]);
printf("%X\n", st[i]);

}


}

the main purpose i want to split this strings is because i have to Convert 2 ASCII character to be 1 byte of hex data. the problem is i don't know how to split strings coz currently i'm asking user to key in input.. Plz guide me cuz i really need help...

hm, i didn't know a function for this, so i wrote my own

Code:

#include <stdio.h>
#include <stdlib.h>

/* converts string of valid hex chars ('XX' : '0'-'9','A'-'F' )
to 1 byte char array with corresponding hex values
*/
void str2hex(char* s, char* d){
  unsigned char c=0;
  int shift=0;
  do {
    c+= (*s>'9')?  *s-55:*s-48; // input must be uppercase !
    if (++shift%2)
      c<<=4;//first shift to left (upper half byte)
    else 
      *d++=c,   c=0; //then move to destination char
  } while(*++s);//unil zero byte of source string is reached
  *d=0; // add 0 byte to dest string
}
int main(int argc, char *argv[]) {
  char input[]="414243";
  char output[sizeof(input)/2+1];
  str2hex(input,output);
  printf("%s ",output);
  system("PAUSE");	
  return 0;
}