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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* parse_size.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "common.h"
#include "util/parse.h"
#include <ctype.h>
#include <limits.h>
int parse_size(const char *what, size_t *out, const char *str,
size_t reference)
{
sqfs_u64 val;
size_t diff;
int ret;
ret = parse_uint(str, -1, &diff, 0, SIZE_MAX, &val);
if (ret == SQFS_ERROR_OVERFLOW)
goto fail_ov;
if (ret != 0)
goto fail_nan;
*out = val;
switch (str[diff]) {
case 'k':
case 'K':
if (SZ_MUL_OV(*out, 1024, out))
goto fail_ov;
++diff;
break;
case 'm':
case 'M':
if (SZ_MUL_OV(*out, 1048576, out))
goto fail_ov;
++diff;
break;
case 'g':
case 'G':
if (SZ_MUL_OV(*out, 1073741824, out))
goto fail_ov;
++diff;
break;
case '%':
if (reference == 0)
goto fail_suffix;
if (SZ_MUL_OV(*out, reference, out))
goto fail_ov;
*out /= 100;
break;
case '\0':
break;
default:
goto fail_suffix;
}
if (str[diff] != '\0')
goto fail_suffix;
return 0;
fail_nan:
fprintf(stderr, "%s: '%s' is not a number.\n", what, str);
return -1;
fail_ov:
fprintf(stderr, "%s: numeric overflow parsing '%s'.\n", what, str);
return -1;
fail_suffix:
fprintf(stderr, "%s: unknown suffix in '%s'.\n", what, str);
return -1;
}
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