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

explain_strtol_or_die - convert a string to a long integer and report errors

#include <libexplain/strtol.h>

long explain_strtol_or_die(const char *nptr, char **endptr, int base);
long explain_strtol_on_error(const char *nptr, char **endptr, int base))

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

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

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

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

The explain_strtol_on_error function always returns the value return by the wrapped strtol(3) system call.

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

strtol(3)
convert a string to a long integer
explain_strtol(3)
explain strtol(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
Copyright (C) 2009 Peter Miller

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