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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* alloc.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util/parse.h"
#include "sqfs/error.h"
#include <ctype.h>
static int parse(const char *in, size_t len, size_t *diff,
sqfs_u64 base, sqfs_u64 vmin, sqfs_u64 vmax, sqfs_u64 *out)
{
/* init result */
if (diff != NULL)
*diff = 0;
*out = 0;
/* sequence has at least 1 digit */
if (len == 0 || !isdigit(*in))
return SQFS_ERROR_CORRUPTED;
/* parse sequence */
while (len > 0 && isdigit(*in)) {
sqfs_u64 x = *in - '0';
if (x >= base)
break;
if ((*out) >= (0xFFFFFFFFFFFFFFFFULL / base))
return SQFS_ERROR_OVERFLOW;
(*out) *= base;
if ((*out) > (0xFFFFFFFFFFFFFFFFULL - x))
return SQFS_ERROR_OVERFLOW;
(*out) += x;
--len;
++in;
if (diff != NULL)
++(*diff);
}
/* range check */
if ((vmin < vmax) && ((*out < vmin) || (*out > vmax)))
return SQFS_ERROR_OUT_OF_BOUNDS;
/* if diff is not used, entire must have been processed */
if (diff == NULL && (len > 0 && *in != '\0'))
return SQFS_ERROR_CORRUPTED;
return 0;
}
int parse_uint(const char *in, size_t len, size_t *diff,
sqfs_u64 vmin, sqfs_u64 vmax, sqfs_u64 *out)
{
return parse(in, len, diff, 10, vmin, vmax, out);
}
int parse_uint_oct(const char *in, size_t len, size_t *diff,
sqfs_u64 vmin, sqfs_u64 vmax, sqfs_u64 *out)
{
return parse(in, len, diff, 8, vmin, vmax, out);
}
int parse_int(const char *in, size_t len, size_t *diff,
sqfs_s64 vmin, sqfs_s64 vmax, sqfs_s64 *out)
{
bool negative = false;
sqfs_u64 temp;
int ret;
if (len > 0 && *in == '-') {
++in;
--len;
negative = true;
}
ret = parse_uint(in, len, diff, 0, 0, &temp);
if (ret)
return ret;
if (temp >= 0x7FFFFFFFFFFFFFFFULL)
return SQFS_ERROR_OVERFLOW;
if (negative) {
if (diff != NULL)
(*diff) += 1;
*out = -((sqfs_s64)temp);
} else {
*out = (sqfs_s64)temp;
}
if ((vmin < vmax) && ((*out < vmin) || (*out > vmax)))
return SQFS_ERROR_OUT_OF_BOUNDS;
return 0;
}
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