Thread: strcat: is there an ANTIstrcat!?

strcat joins two strings together but i wanted to know if there is a option that does the reverse.

i.e. if we had

Code:

string1[] = "1, 2, 3, 4, 5, 6"

and

Code:

string2[] = "1, 2, 3"

then the output would be

Code:

5, 6

in a new string.

anyone know of a method?

strspn(stringa, stringb ) returns the offset of the first character in stringb that is not found anywhere in stringa.

strspn is non standard
A function like this shouldn't be too hard to implement yourself. Why don't you give it a go?

Originally Posted by sand_man

strspn is non standard
A function like this shouldn't be too hard to implement yourself. Why don't you give it a go?

That's odd - It was part of the ANSI C89 standard. I don't have ISO C standard around. Has it been dropped - sounds unlikley.

guys, thanks for the replies, i gave it a go and got partial success.

the problem is that the strtok deletes every occurance of a letter or number, i only want exact matches deleted.

otherwise its absolutely perfect

the is my attempt

Code:

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

//***reads input one character at a time from the input stream 
//   and puts into string called "uncoded"***//

char uncoded[BUFSIZ] = "#RAWWAASFRAMEA,COM1,9,68.0,SATTIME,1263,128186.000,000000000,58e4,1522,22,122,62,563456345dba43623443efdaef3245345fea325345626634623623c000,22*d04567cde";	

//char uncodedraaw[BUFSIZ] = "#RAWWAASFRAMEA, COM1, COM2,00000000, 58e4, 122, 22";

char uncodedraaw[BUFSIZ] = "#RAWWAASFRAMEA, SATTIME, COM1";

//   char *token;

char *decoded;


void main()

{

printf( "remaining data:\n" );

decoded = strtok( uncoded, uncodedraaw );

while( decoded != NULL )
   {
      /* While there are tokens in "string" */
      printf( " %s", decoded );
      /* Get next token: */
      decoded = strtok( NULL, uncodedraaw );
   }

}

Originally Posted by jim mcnamara

That's odd - It was part of the ANSI C89 standard. I don't have ISO C standard around. Has it been dropped - sounds unlikley.

Sorry for the false information, I had a quick glance but couldn't find it so I thought it was non standard.