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           #include <error.h>
           void error(int status, int errnum, const char *format, ...);
           void error_at_line(int status, int errnum, const char *filename,
                              unsigned int linenum, const char *format, ...);
           extern unsigned int error_message_count;
           extern int error_one_per_line;
           extern void (*error_print_progname) (void);


           error() is a general error-reporting function.  It flushes stdout,  and
           then  outputs to stderr the program name, a colon and a space, the mes-
           sage specified by the printf(3)-style format  string  format,  and,  if
           errnum  is  nonzero,  a second colon and a space followed by the string
           given by strerror(errnum).  Any arguments required  for  format  should
           follow format in the argument list.  The output is terminated by a new-
           line character.
           The program name printed by error() is the value of the global variable
           program_invocation_name(3).   program_invocation_name initially has the
           same value as main()'s argv[0].  The value of this variable can be mod-
           ified to change the output of error().
           If  status has a nonzero value, then error() calls exit(3) to terminate
           the program using the given value as the exit status.
           The error_at_line() function is exactly the same as error(), except for
           the  addition  of  the arguments filename and linenum.  The output pro-
           duced is as for error(), except that after the program name  are  writ-
           ten: a colon, the value of filename, a colon, and the value of linenum.
           The preprocessor values __LINE__ and __FILE__ may be useful when  call-
           ing  error_at_line(),  but other values can also be used.  For example,
           these arguments could refer to a location in an input file.
           If the global variable error_one_per_line is set nonzero, a sequence of
           error_at_line()  calls with the same value of filename and linenum will
           result in only one message (the first) being output.
           The global variable error_message_count counts the number  of  messages
           that have been output by error() and error_at_line().
           If  the global variable error_print_progname is assigned the address of
           a function (i.e., is not NULL), then that function is called instead of
           prefixing  the  message  with the program name and colon.  The function
           should print a suitable string to stderr.

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