mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-25 23:52:17 +00:00
43 lines
932 B
C
43 lines
932 B
C
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#define _GNU_SOURCE
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#include "kerncompat.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <limits.h>
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#if BTRFS_FLAT_INCLUDES
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#else
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#endif /* BTRFS_FLAT_INCLUDES */
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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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