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CodeBlocksPortable/WATCOM/samples/clibexam/bsearch.c

40 lines
868 B
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const char *keywords[] = {
"auto",
"break",
"case",
"char",
/* . */
/* . */
/* . */
"while"
};
#define NUM_KW sizeof(keywords) / sizeof(char *)
int kw_compare( const void *p1, const void *p2 )
{
const char *p1c = (const char *) p1;
const char **p2c = (const char **) p2;
return( strcmp( p1c, *p2c ) );
}
int keyword_lookup( const char *name )
{
const char **key;
key = (char const **) bsearch( name, keywords, NUM_KW,
sizeof( char * ), kw_compare );
if( key == NULL ) return( -1 );
return key - keywords;
}
void main()
{
printf( "%d\n", keyword_lookup( "case" ) );
printf( "%d\n", keyword_lookup( "crigger" ) );
printf( "%d\n", keyword_lookup( "auto" ) );
}