nasmlib/bsi.c

/* SPDX-License-Identifier: BSD-2-Clause */
/* Copyright 1996-2016 The NASM Authors - All Rights Reserved */

/*
 * nasmlib.c	library routines for the Netwide Assembler
 */

#include "compiler.h"


#include "nasmlib.h"

/*
 * Binary search.
 */
int bsi(const char *string, const char **array, int size)
{
    int i = -1, j = size;       /* always, i < index < j */
    while (j - i >= 2) {
        int k = (i + j) / 2;
        int l = strcmp(string, array[k]);
        if (l < 0)              /* it's in the first half */
            j = k;
        else if (l > 0)         /* it's in the second half */
            i = k;
        else                    /* we've got it :) */
            return k;
    }
    return -1;                  /* we haven't got it :( */
}

int bsii(const char *string, const char **array, int size)
{
    int i = -1, j = size;       /* always, i < index < j */
    while (j - i >= 2) {
        int k = (i + j) / 2;
        int l = nasm_stricmp(string, array[k]);
        if (l < 0)              /* it's in the first half */
            j = k;
        else if (l > 0)         /* it's in the second half */
            i = k;
        else                    /* we've got it :) */
            return k;
    }
    return -1;                  /* we haven't got it :( */
}