[HACKERS] like and optimization

[Juriy Goloveshkin]

Hello, I didn't know pgsql-sources close,
so I wrote this code just as example of idea.
Can somebody review and make patch for pgsql?
(if this idea is good, of cource).

like-optimization is working only with ASCII, but it is simple to fix.
This programm makes greater string(I tested with KOI8-R):

-- 
Bye
Juriy Goloveshkin

#include <locale.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

unsigned char table[256];

void create(void){
        unsigned char patt[2];
        unsigned char dest[2];
        int i;
        table[0]=0;
        patt[1]=0;
        for(i=1;i<256;i++){
                patt[0]=i;
                strxfrm(dest,patt,2);
                table[dest[0]]=patt[0];
        }
}

char* make_greater_string(const unsigned char *word){
        unsigned char *workstr;
        int                     len;

        workstr=strdup(word);
        while ((len = strlen(workstr)) > 0)
        {
                unsigned char *lastchar = (unsigned char *) (workstr + len - 1);
                unsigned char tmp[2];

                while (*lastchar < (unsigned char) 255)
                {
                        strxfrm(tmp,lastchar,2);
                        *lastchar=(unsigned char)table[tmp[0]+1];
                        return workstr; /* Success! */
                }
                *lastchar = '\0';
        }
        free(workstr);
        return NULL;
}

int main(int argc, char *argv[]){
        unsigned char *newword;
        if (argc<2){
                printf("Usage: %s word\n",argv[0]);
                return 1;
        }
        setlocale(LC_ALL,"");
        create();
        printf("---\n%s\n---\n",&table[20]);
        
        printf("Word is '%s'\n",argv[1]);
        
        newword=make_greater_string(argv[1]);
        printf("Bigger word is '%s'\n",newword);
        
        return 0;
}