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_memicmp, _memicmp_l

  • Straipsnis

Compares characters in two buffers (case-insensitive).

Syntax

int _memicmp(
   const void *buffer1,
   const void *buffer2,
   size_t count
);
int _memicmp_l(
   const void *buffer1,
   const void *buffer2,
   size_t count,
   _locale_t locale
);

Parameters

buffer1
First buffer.

buffer2
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 buffer1 less than buffer2.
0 buffer1 identical to buffer2.
> 0 buffer1 greater than buffer2.
_NLSCMPERROR An error occurred.

Remarks

The _memicmp function compares the first count characters of the two buffers buffer1 and buffer2 byte by byte. The comparison isn't case-sensitive.

If either buffer1 or buffer2 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.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine Required header
_memicmp <memory.h> or <string.h>
_memicmp_l <memory.h> or <string.h>

For more compatibility information, see Compatibility.

Example

// 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.

See also

Buffer manipulation
_memccpy
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