Performs a linear search for the specified key.
| #include <search.h> | Required only for function declarations |
void *_lfind( const void *key, const void *base, unsigned int *num,
unsigned int width, int ( __cdecl *compare )( const void *elem1,
const void *elem2 ) );
| key | Object to search for | |
| base | Pointer to base of search data | |
| num | Number of array elements | |
| width | Width of array elements | |
| compare() | Pointer to comparison routine | |
| elem1 | Pointer to the key for the search | |
| elem2 | Pointer to the array element to be compared with the key |
The _lfind function performs a linear search for the value key in an array of num elements; each element is width bytes in size. (Unlike bsearch, _lfind does not require the array to be sorted.) The base argument is a pointer to the base of the array to be searched.
The compare argument is a pointer to a user-supplied routine that compares two array elements and then returns a value specifying their relationship. The _lfind function calls the compare routine one or more times during the search, passing pointers to two array elements on each call. This routine must compare the elements, then return one of the following values:
| Value | Meaning |
| Nonzero | Elements are different |
| 0 | Elements are identical |
If the key is found, _lfind returns a pointer to the element of the array at base that matches key. If the key is not found, _lfind returns NULL.
Standards:UNIX
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:DOS32X
Use _lfind for compatibility with ANSI naming conventions of non-ANSI functions. Use lfind and link with OLDNAMES.LIB for UNIX compatibility.
/* LFIND.C: This program uses _lfind to search for the word "hello"
* in the command-line arguments.
*/
#include <search.h>
#include <string.h>
#include <stdio.h>
int compare( void *arg1, void *arg2 );
void main( int argc, char **argv )
{
char **result;
char *key = "hello";
result = (char **)_lfind( &key, argv,
&argc, sizeof( char * ), compare );
if( result )
printf( "%s found\n", *result );
else
printf( "hello not found!\n" );
}
int compare(void *arg1, void *arg2 )
{
return( _stricmp ( * ( char** ) arg1, * ( char** ) arg2 );
}
[C:\LIBREF] _lfind What if I said Hello world
Hello found