77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include "kerncompat.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include "string-utils.h"
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int string_is_numerical(const char *str)
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{
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if (!str)
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return 0;
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if (!(*str >= '0' && *str <= '9'))
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return 0;
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while (*str >= '0' && *str <= '9')
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str++;
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if (*str != '\0')
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return 0;
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return 1;
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}
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int prefixcmp(const char *str, const char *prefix)
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{
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for (; ; str++, prefix++)
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if (!*prefix)
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return 0;
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else if (*str != *prefix)
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return (unsigned char)*prefix - (unsigned char)*str;
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}
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/*
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* This function should be only used when parsing command arg, it won't return
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* error to its caller and rather exit directly just like usage().
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*/
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u64 arg_strtou64(const char *str)
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{
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u64 value;
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char *ptr_parse_end = NULL;
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value = strtoull(str, &ptr_parse_end, 0);
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if (ptr_parse_end && *ptr_parse_end != '\0') {
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fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
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str);
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exit(1);
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}
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/*
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* if we pass a negative number to strtoull, it will return an
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* unexpected number to us, so let's do the check ourselves.
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*/
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if (str[0] == '-') {
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fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
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str);
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exit(1);
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}
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if (value == ULLONG_MAX) {
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fprintf(stderr, "ERROR: %s is too large.\n", str);
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exit(1);
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}
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return value;
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}
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