4748d400c4
Now that there's only __strncpy_null we can drop the underscore and move it to string-utils as it's a generic string function rather than something for paths. Signed-off-by: David Sterba <dsterba@suse.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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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 "common/string-utils.h"
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#include "common/messages.h"
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#include "common/parse-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 string_has_prefix(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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* strncpy_null - strncpy with null termination
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* @dest: the target array
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* @src: the source string
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* @n: maximum bytes to copy (size of *dest)
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*
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* Like strncpy, but ensures destination is null-terminated.
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*
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* Copies the string pointed to by src, including the terminating null
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* byte ('\0'), to the buffer pointed to by dest, up to a maximum
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* of n bytes. Then ensure that dest is null-terminated.
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*/
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char *strncpy_null(char *dest, const char *src, size_t n)
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{
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strncpy(dest, src, n);
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if (n > 0)
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dest[n - 1] = '\0';
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return dest;
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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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int ret;
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ret = parse_u64(str, &value);
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if (ret == -ERANGE) {
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error("%s is too large", str);
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exit(1);
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} else if (ret == -EINVAL) {
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if (str[0] == '-')
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error("%s: negative value is invalid", str);
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else
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error("%s is not a valid numeric value", 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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u64 arg_strtou64_with_suffix(const char *str)
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{
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u64 value;
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int ret;
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ret = parse_u64_with_suffix(str, &value);
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if (ret == -ERANGE) {
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error("%s is too large", str);
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exit(1);
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} else if (ret == -EINVAL) {
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error("%s is not a valid numeric value with supported size suffixes", str);
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exit(1);
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} else if (ret < 0) {
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errno = -ret;
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error("failed to parse string '%s': %m", 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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