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/*
* Copyright (C) 2018 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/******************************************************************************/
/******************************************************************************/
/* CONVERTION OF EXPIRATIONS TO AND FROM TEXT */
/******************************************************************************/
/******************************************************************************/
#include <stdbool.h>
#include <string.h>
#include "idgen.h"
static char i2c[] =
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"-+*/<%$#@?!,.&~^>=|_"
;
static char nxt[96];
#define ZERO i2c[0]
#define ONE i2c[1]
static char next(char c)
{
unsigned i;
char r;
if ((signed char)c <= 32)
r = ONE;
else {
r = nxt[c - 32];
if (!r) {
memset(nxt, ONE, sizeof(nxt));
for (i = 0 ; (r = i2c[i]) ; i++)
nxt[r - 32] = i2c[i + 1] ?: ZERO;
r = nxt[c - 32];
}
}
return r;
}
void
idgen_init(
idgen_t idgen
) {
memset(idgen, 0, sizeof(idgen_t));
idgen[0] = ZERO;
}
void
idgen_next(
idgen_t idgen
) {
unsigned i;
char c;
i = 0;
do {
c = next(idgen[i]);
idgen[i++] = c;
} while (c == ZERO && i < sizeof(idgen_t) - 1);
}
bool
idgen_is_valid(
idgen_t idgen
) {
unsigned i = 0;
while (i < sizeof(idgen_t) && idgen[i] && strchr(i2c, idgen[i]))
i++;
return i && i < sizeof(idgen_t) && !idgen[i];
}
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