43 lines
932 B
C
43 lines
932 B
C
|
#define _GNU_SOURCE
|
||
|
|
|
||
|
|
#include "kerncompat.h"
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
#if BTRFS_FLAT_INCLUDES
|
||
|
|
#else
|
||
|
|
#endif /* BTRFS_FLAT_INCLUDES */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This function should be only used when parsing command arg, it won't return
|
||
|
|
* error to its caller and rather exit directly just like usage().
|
||
|
|
*/
|
||
|
|
u64 arg_strtou64(const char *str)
|
||
|
|
{
|
||
|
|
u64 value;
|
||
|
|
char *ptr_parse_end = NULL;
|
||
|
|
|
||
|
|
value = strtoull(str, &ptr_parse_end, 0);
|
||
|
|
if (ptr_parse_end && *ptr_parse_end != '\0') {
|
||
|
|
fprintf(stderr, "ERROR: %s is not a valid numeric value.\n",
|
||
|
|
str);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* if we pass a negative number to strtoull, it will return an
|
||
|
|
* unexpected number to us, so let's do the check ourselves.
|
||
|
|
*/
|
||
|
|
if (str[0] == '-') {
|
||
|
|
fprintf(stderr, "ERROR: %s: negative value is invalid.\n",
|
||
|
|
str);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (value == ULLONG_MAX) {
|
||
|
|
fprintf(stderr, "ERROR: %s is too large.\n", str);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
return value;
|
||
|
|
}
|