Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
explain_strtoll(3)	   Library Functions Manual	    explain_strtoll(3)

NAME
       explain_strtoll - explain strtoll(3) errors

SYNOPSIS
       #include	<libexplain/strtoll.h>
       const char *explain_strtoll(const char *nptr, char **endptr, int	base);
       const char *explain_errno_strtoll(int errnum, const char	*nptr, char
       **endptr, int base);
       void explain_message_strtoll(char *message, int message_size, const
       char *nptr, char	**endptr, int base);
       void explain_message_errno_strtoll(char *message, int message_size, int
       errnum, const char *nptr, char **endptr,	int base);

DESCRIPTION
       These functions may be used to obtain explanations for errors  returned
       by the strtoll(3) system	call.

   explain_strtoll
       const char *explain_strtoll(const char *nptr, char **endptr, int	base);

       The explain_strtoll function is used to obtain an explanation of	an er-
       ror returned by the strtoll(3) system call. The least the message  will
       contain	is  the	 value of strerror(errno), but usually it will do much
       better, and indicate the	underlying cause in more detail.

       The errno global	variable will be used to obtain	the error value	to  be
       decoded.

       nptr    The  original  nptr, exactly as passed to the strtoll(3)	system
	       call.

       endptr  The original endptr, exactly as passed to the strtoll(3)	system
	       call.

       base    The  original  base, exactly as passed to the strtoll(3)	system
	       call.

       Returns:
	       The message explaining the error. This message buffer is	shared
	       by  all	libexplain  functions  which do	not supply a buffer in
	       their argument list.  This will be overwritten by the next call
	       to  any libexplain function which shares	this buffer, including
	       other threads.

       Note: This function is not thread safe, because it shares a return buf-
       fer across all threads, and many	other functions	in this	library.

       Example:	 This  function	is intended to be used in a fashion similar to
       the following example:
	      long long	result = strtoll(nptr, endptr, base);
	      if (result < 0)
	      {
		  fprintf(stderr, "%s\n", explain_strtoll(nptr,	endptr,
		  base));
		  exit(EXIT_FAILURE);
	      }

       The  above  code	 example is available pre-packaged as the explain_str-
       toll_or_die(3) function.

   explain_errno_strtoll
       const char *explain_errno_strtoll(int errnum, const char	*nptr, char
       **endptr, int base);

       The  explain_errno_strtoll function is used to obtain an	explanation of
       an error	returned by the	strtoll(3) system call.	The least the  message
       will  contain  is  the value of strerror(errno),	but usually it will do
       much better, and	indicate the underlying	cause in more detail.

       errnum  The error value to be decoded, usually obtained from the	 errno
	       global  variable	 just  before this function is called. This is
	       necessary if you	need to	call any code between the system  call
	       to  be explained	and this function, because many	libc functions
	       will alter the value of errno.

       nptr    The original nptr, exactly as passed to the  strtoll(3)	system
	       call.

       endptr  The original endptr, exactly as passed to the strtoll(3)	system
	       call.

       base    The original base, exactly as passed to the  strtoll(3)	system
	       call.

       Returns:
	       The message explaining the error. This message buffer is	shared
	       by all libexplain functions which do not	 supply	 a  buffer  in
	       their argument list.  This will be overwritten by the next call
	       to any libexplain function which	shares this buffer,  including
	       other threads.

       Note: This function is not thread safe, because it shares a return buf-
       fer across all threads, and many	other functions	in this	library.

       Example:	This function is intended to be	used in	a fashion  similar  to
       the following example:
	      long long	result = strtoll(nptr, endptr, base);
	      if (result < 0)
	      {
		  int err = errno;
		  fprintf(stderr, "%s\n", explain_errno_strtoll(err, nptr,
		  endptr, base));
		  exit(EXIT_FAILURE);
	      }

       The above code example is available pre-packaged	 as  the  explain_str-
       toll_or_die(3) function.

   explain_message_strtoll
       void explain_message_strtoll(char *message, int message_size, const
       char *nptr, char	**endptr, int base);

       The explain_message_strtoll function is used to obtain  an  explanation
       of  an error returned by	the strtoll(3) system call. The	least the mes-
       sage will contain is the	value of strerror(errno), but usually it  will
       do much better, and indicate the	underlying cause in more detail.

       The  errno global variable will be used to obtain the error value to be
       decoded.

       message The location in which to	store the returned message. If a suit-
	       able message return buffer is supplied, this function is	thread
	       safe.

       message_size
	       The size	in bytes of the	location in which  to  store  the  re-
	       turned message.

       nptr    The  original  nptr, exactly as passed to the strtoll(3)	system
	       call.

       endptr  The original endptr, exactly as passed to the strtoll(3)	system
	       call.

       base    The  original  base, exactly as passed to the strtoll(3)	system
	       call.

       Example:	This function is intended to be	used in	a fashion  similar  to
       the following example:
	      long long	result = strtoll(nptr, endptr, base);
	      if (result < 0)
	      {
		  char message[3000];
		  explain_message_strtoll(message, sizeof(message), nptr,
		  endptr, base);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

       The above code example is available pre-packaged	 as  the  explain_str-
       toll_or_die(3) function.

   explain_message_errno_strtoll
       void explain_message_errno_strtoll(char *message, int message_size, int
       errnum, const char *nptr, char **endptr,	int base);

       The explain_message_errno_strtoll function is used to obtain an	expla-
       nation  of  an  error returned by the strtoll(3)	system call. The least
       the message will	contain	is the value of	strerror(errno),  but  usually
       it  will	 do much better, and indicate the underlying cause in more de-
       tail.

       message The location in which to	store the returned message. If a suit-
	       able message return buffer is supplied, this function is	thread
	       safe.

       message_size
	       The size	in bytes of the	location in which  to  store  the  re-
	       turned message.

       errnum  The  error value	to be decoded, usually obtained	from the errno
	       global variable just before this	function is  called.  This  is
	       necessary  if you need to call any code between the system call
	       to be explained and this	function, because many libc  functions
	       will alter the value of errno.

       nptr    The  original  nptr, exactly as passed to the strtoll(3)	system
	       call.

       endptr  The original endptr, exactly as passed to the strtoll(3)	system
	       call.

       base    The  original  base, exactly as passed to the strtoll(3)	system
	       call.

       Example:	This function is intended to be	used in	a fashion  similar  to
       the following example:
	      long long	result = strtoll(nptr, endptr, base);
	      if (result < 0)
	      {
		  int err = errno;
		  char message[3000];
		  explain_message_errno_strtoll(message, sizeof(message), err,
		  nptr,	endptr,	base);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

       The above code example is available pre-packaged	 as  the  explain_str-
       toll_or_die(3) function.

SEE ALSO
       strtoll(3)
	       convert a string	to a long integer

       explain_strtoll_or_die(3)
	       convert a string	to a long integer and report errors

COPYRIGHT
       libexplain version 1.3
       Copyright (C) 2009 Peter	Miller

							    explain_strtoll(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COPYRIGHT

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=explain_strtoll&sektion=3&manpath=FreeBSD+12.2-RELEASE+and+Ports>

home | help