/*
 *  BMG.C
 *
 *  Written by Paul Edwards and released to the public domain.
 *
 *  Emulate Boyer-More-Gosper routines, without actually doing it, because
 *  Msged doesn't use the proper functionality, for unknown reasons.
 */

#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "bmg.h"
#include "strextra.h"

static char search_string[256];

char *bmg_find(char *text, char *search)
{
    char *endText, *p;
    int lent, lens, searchStart;

    lent = strlen(text);
    lens = strlen(search);
    if (lens > lent)
    {
        return NULL;
    }
    searchStart = toupper(*search);
    p = text;
    endText = p + (lent - lens) + 1;
    while (p != endText)
    {
        if (toupper(*p) == searchStart)
        {
            if (strncmpi(p, search, lens) == 0)
            {
                return p;
            }
        }
        p++;
    }
    return NULL;
}

void bmg_setsearch(char *search)
{
    strcpy(search_string, search);
}

char *bmg_search(char *text)
{
    return bmg_find(text, search_string);
}