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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 <ctype.h>
#include <limits.h>
int parse_size(const char *what, size_t *out, const char *str,
size_t reference)
{
const char *in = str;
size_t acc = 0, x;
if (!isdigit(*in))
goto fail_nan;
while (isdigit(*in)) {
x = *(in++) - '0';
if (SZ_MUL_OV(acc, 10, &acc))
goto fail_ov;
if (SZ_ADD_OV(acc, x, &acc))
goto fail_ov;
}
switch (*in) {
case 'k':
case 'K':
if (SZ_MUL_OV(acc, 1024, &acc))
goto fail_ov;
++in;
break;
case 'm':
case 'M':
if (SZ_MUL_OV(acc, 1048576, &acc))
goto fail_ov;
++in;
break;
case 'g':
case 'G':
if (SZ_MUL_OV(acc, 1073741824, &acc))
goto fail_ov;
++in;
break;
case '%':
if (reference == 0)
goto fail_suffix;
if (SZ_MUL_OV(acc, reference, &acc))
goto fail_ov;
acc /= 100;
break;
case '\0':
break;
default:
goto fail_suffix;
}
if (*in != '\0')
goto fail_suffix;
*out = acc;
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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