Better solution for this "if" spaghetti

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LEARN ABOUT LINUX

vwarn

ERR(3)							     Linux Programmer's Manual							    ERR(3)

NAME

       err, verr, errx, verrx, warn, vwarn, warnx, vwarnx - formatted error messages

SYNOPSIS

       #include <err.h>

       void err(int eval, const char *fmt, ...);

       void errx(int eval, const char *fmt, ...);

       void warn(const char *fmt, ...);

       void warnx(const char *fmt, ...);

       #include <stdarg.h>

       void verr(int eval, const char *fmt, va_list args);

       void verrx(int eval, const char *fmt, va_list args);

       void vwarn(const char *fmt, va_list args);

       void vwarnx(const char *fmt, va_list args);

DESCRIPTION

       The  err() and warn() family of functions display a formatted error message on the standard error output.  In all cases, the last component
       of the program name, a colon character, and a space are output.	If the fmt argument is not NULL, the printf(3)-like formatted  error  mes-
       sage is output.	The output is terminated by a newline character.

       The  err(),  verr(), warn(), and vwarn() functions append an error message obtained from strerror(3) based on a code or the global variable
       errno, preceded by another colon and space unless the fmt argument is NULL.

       The err(), verr(), warn(), and vwarn() functions use the global variable errno to look up the error message.

       The errx() and warnx() functions do not append an error message.

       The err(), verr(), errx(), and verrx() functions do not return, but exit with the value of the argument eval.

EXAMPLES

       Display the current errno information string and exit:

	   if ((p = malloc(size)) == NULL)
	       err(1, NULL);
	   if ((fd = open(file_name, O_RDONLY, 0)) == -1)
	       err(1, "%s", file_name);

       Display an error message and exit:

	   if (tm.tm_hour < START_TIME)
	       errx(1, "too early, wait until %s", start_time_string);

       Warn of an error:

	   if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
	       warnx("%s: %s: trying the block device",
		       raw_device, strerror(errno));
	   if ((fd = open(block_device, O_RDONLY, 0)) == -1)
	       err(1, "%s", block_device);

CONFORMING TO

       These functions are nonstandard BSD extensions.

SEE ALSO

       error(3), exit(3), perror(3), printf(3), strerror(3)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2007-12-28								    ERR(3)

Shell Programming and Scripting