memcmp -- Compare Buffers

Format

#include <string.h>  /* also in <memory.h> */
int memcmp(const void *buf1, const void *buf2, size_t count);

Language Level: ANSI, XPG4, Extension
memcmp compares the first count bytes of buf1 and buf2.

Return Value
memcmp returns a value indicating the relationship between the two buffers as follows:

Value Meaning
Less than 0 buf1 less than buf2
0 buf1 identical to buf2
Greater than 0 buf1 greater than buf2

Example
This example reports the relation between the two arguments passed to main to determine which, if either, is greater.

#include <stdio.h>
#include <string.h>
int main(int argc, char ** argv)
{
  int  len;
  int  result;
  if ( argc != 3 )
  {
     printf( "Usage: %s string1 string2\n", argv[0] );
  }
  else
  {
     /* Determine the length to be used for comparison */
     if (strlen( argv[1] ) > strlen( argv[2] ))
       len = strlen( argv[1] );
     else
       len = strlen( argv[2] );
     result = memcmp( argv[1], argv[2], len );
     printf( "When the first %i characters are compared,\n", len );
     if ( result == 0 )
       printf( "\"%s\" is identical to \"%s\"\n", argv[1], argv[2] );
     else
       if ( result < 0 )
         printf( "\"%s\" is less than \"%s\"\n", argv[1], argv[2] );
       else
         printf( "\"%s\" is greater than \"%s\"\n", argv[1], argv[2] );
   }
   return 0;
   /********************************************************************
     If the program is passed the arguments "firststring secondstring",
     the output should be:
     When the first 11 characters are compared,
     "firststring" is less than "secondstring"
   ********************************************************************/
}



memccpy -- Copy Bytes
memchr -- Search Buffer
memcpy -- Copy Bytes
memicmp -- Compare Bytes
memmove -- Copy Bytes
memset -- Set Bytes to Value
strcmp -- Compare Strings
<stdio.h>
<string.h>