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Man Pages
explain_strtoull_or_die(3) FreeBSD Library Functions Manual explain_strtoull_or_die(3)

explain_strtoull_or_die - convert string to integer and report errors

#include <libexplain/strtoull.h>

unsigned long long explain_strtoull_or_die(const char *nptr, char **endptr, int base);
unsigned long long explain_strtoull_on_error(const char *nptr, char **endptr, int base))

The explain_strtoull_or_die function is used to call the strtoull(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_strtoull(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

The explain_strtoull_on_error function is used to call the strtoull(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_strtoull(3) function, but still returns to the caller.

nptr
The nptr, exactly as to be passed to the strtoull(3) system call.
endptr
The endptr, exactly as to be passed to the strtoull(3) system call.
base
The base, exactly as to be passed to the strtoull(3) system call.

The explain_strtoull_or_die function only returns on success, see strtoull(3) for more information. On failure, prints an explanation and exits, it does not return.

The explain_strtoull_on_error function always returns the value return by the wrapped strtoull(3) system call.

The explain_strtoull_or_die function is intended to be used in a fashion similar to the following example:
unsigned long long result = explain_strtoull_or_die(nptr, endptr, base);

strtoull(3)
convert a string to an unsigned long integer
explain_strtoull(3)
explain strtoull(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
Copyright (C) 2009 Peter Miller

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