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Strcat
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c standard library
   
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In Computing , the C Programming Language offers a Library Function called strcat that allows one memory block to be appended to another memory block. Both memory blocks are required to be null-terminated. Since, in C, strings are not first-class Datatype s, and are implemented as blocks of ASCII Byte s in memory, strcat will effectively append one string to another given two Pointer s to blocks of allocated memory. The name strcat is an abbreviation of "string concatenate".

For example:



    

  • str1 = malloc(LARGE_NUMBER_1);

    • 

  • str2 = malloc(LARGE_NUMBER_1+LARGE_NUMBER_2-1);

    • 
 




 fgets(str1, LARGE_NUMBER_1, stdin);

 fgets(str2, LARGE_NUMBER_2, stdin);


    

  •  the argument order makes it like an assignment - str2 "+=" str1 ---/

    •


Here are two possible implementation of strcat:

  • strcat(char ---dest, const char ---src)

    • {

  • orig_dest = dest;

  • (dest++) ); --dest; //dest points at null terminator

  • (dest++) = ---(src++) );

    • return orig_dest;

}




    


  • 

  • dest, const char ---src)

    • 
  {





    

  • p;

    • 

  • q;

    • 







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