source: MondoRescue/trunk/mindi-busybox/e2fsprogs/e2p/hashstr.c@ 904

/*
 * feature.c --- convert between features and strings
 *
 * Copyright (C) 1999  Theodore Ts'o <tytso@mit.edu>
 *
 * This file can be redistributed under the terms of the GNU Library General
 * Public License
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "e2p.h"

struct hash {
    int num;
    const char *string;
};

static const struct hash hash_list[] = {
    { EXT2_HASH_LEGACY,   "legacy" },
    { EXT2_HASH_HALF_MD4, "half_md4" },
    { EXT2_HASH_TEA,      "tea" },
    { 0, 0 },
};

const char *e2p_hash2string(int num)
{
    const struct hash *p;
    static char buf[20];

    for (p = hash_list; p->string; p++) {
        if (num == p->num)
            return p->string;
    }
    sprintf(buf, "HASHALG_%d", num);
    return buf;
}

/*
 * Returns the hash algorithm, or -1 on error
 */
int e2p_string2hash(char *string)
{
    const struct hash *p;
    char *eptr;
    int num;

    for (p = hash_list; p->string; p++) {
        if (!strcasecmp(string, p->string)) {
            return p->num;
        }
    }
    if (strncasecmp(string, "HASHALG_", 8))
        return -1;

    if (string[8] == 0)
        return -1;
    num = strtol(string+8, &eptr, 10);
    if (num > 255 || num < 0)
        return -1;
    if (*eptr)
        return -1;
    return num;
}