_memicmp, _memicmp_l

Compares characters in two buffers (case-insensitive).

int _memicmp(
   const void *buf1,
   const void *buf2,
   size_t count 
int _memicmp_l(
   const void *buf1,
   const void *buf2,
   size_t count,
   _locale_t locale


  • buf1
    First buffer.

  • buf2
    Second buffer.

  • count
    Number of characters.

  • locale
    Locale to use.

Return Value

The return value indicates the relationship between the buffers.

Return value

Relationship of first count bytes of buf1 and buf2

< 0

buf1 less than buf2.


buf1 identical to buf2.

> 0

buf1 greater than buf2.


An error occurred.


The _memicmp function compares the first count characters of the two buffers buf1 and buf2 byte by byte. The comparison is not case-sensitive.

If either buf1 or buf2 is a null pointer, this function invokes an invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, the function returns _NLSCMPERROR and sets errno to EINVAL.

_memicmp uses the current locale for locale-dependent behavior; _memicmp_l is identical except that it uses the locale passed in instead. For more information, see Locale.



Required header


<memory.h> or <string.h>


<memory.h> or <string.h>

For more compatibility information, see Compatibility in the Introduction.


// crt_memicmp.c
// This program uses _memicmp to compare
// the first 29 letters of the strings named first and
// second without regard to the case of the letters.

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

int main( void )
   int result;
   char first[] = "Those Who Will Not Learn from History";
   char second[] = "THOSE WHO WILL NOT LEARN FROM their mistakes";
   // Note that the 29th character is right here ^

   printf( "Compare '%.29s' to '%.29s'\n", first, second );
   result = _memicmp( first, second, 29 );
   if( result < 0 )
      printf( "First is less than second.\n" );
   else if( result == 0 )
      printf( "First is equal to second.\n" );
   else if( result > 0 )
      printf( "First is greater than second.\n" );
Compare 'Those Who Will Not Learn from' to 'THOSE WHO WILL NOT LEARN FROM'
First is equal to second.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

See Also


Buffer Manipulation


memchr, wmemchr

memcmp, wmemcmp

memcpy, wmemcpy

memset, wmemset

_stricmp, _wcsicmp, _mbsicmp, _stricmp_l, _wcsicmp_l, _mbsicmp_l

_strnicmp, _wcsnicmp, _mbsnicmp, _strnicmp_l, _wcsnicmp_l, _mbsnicmp_l