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/* $Source: /u/mark/src/pax/RCS/warn.c,v $

 *

 * $Revision: 1.2 $

 *

 * warn.c - miscellaneous user warning routines 

 *

 * DESCRIPTION

 *

 *	These routines provide the user with various forms of warning

 *	and informational messages.

 *

 * AUTHOR

 *

 *     Mark H. Colburn, NAPS International (mark@jhereg.mn.org)

 *

 * Sponsored by The USENIX Association for public distribution. 

 *

 * Copyright (c) 1989 Mark H. Colburn.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice is duplicated in all such 

 * forms and that any documentation, advertising materials, and other 

 * materials related to such distribution and use acknowledge that the 

 * software was developed * by Mark H. Colburn and sponsored by The 

 * USENIX Association. 

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *

 * $Log:	warn.c,v $

 * Revision 1.2  89/02/12  10:06:15  mark

 * 1.2 release fixes

 * 

 * Revision 1.1  88/12/23  18:02:40  mark

 * Initial revision

 * 

 */

#ifndef lint

static char *ident = "$Id: warn.c,v 1.2 89/02/12 10:06:15 mark Exp $";

static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";

#endif /* ! lint */

/* Headers */

#include "pax.h"

/* Function Prototypes */

#ifdef __STDC__

static void prsize(FILE *, OFFSET);

#else /* !__STDC__ */

static void prsize();

#endif /* __STDC__ */

/* warnarch - print an archive-related warning message and offset

 *

 * DESCRIPTION

 *

 *	Present the user with an error message and an archive offset at

 *	which the error occured.   This can be useful for diagnosing or

 *	fixing damaged archives.

 *

 * PARAMETERS

 *

 *	char 	*msg	- A message string to be printed for the user.

 *	OFFSET 	adjust	- An adjustment which is added to the current 

 *			  archive position to tell the user exactly where 

 *			  the error occurred.

 */

#ifdef __STDC__

void warnarch(char *msg, OFFSET adjust)

#else 

void warnarch(msg, adjust)

char           *msg;

OFFSET          adjust;

#endif

{

    fprintf(stderr, "%s: [offset ", myname);

    prsize(stderr, total - adjust);

    fprintf(stderr, "]: %s\n", msg);

}

/* strerror - return pointer to appropriate system error message

 *

 * DESCRIPTION

 *

 *	Get an error message string which is appropriate for the setting

 *	of the errno variable.

 *

 * RETURNS

 *

 *	Returns a pointer to a string which has an appropriate error

 *	message for the present value of errno.  The error message

 *	strings are taken from sys_errlist[] where appropriate.  If an

 *	appropriate message is not available in sys_errlist, then a

 *	pointer to the string "Unknown error (errno <errvalue>)" is 

 *	returned instead.

 */

#ifdef __STDC__

char *strerror(void)

#else

char *strerror()

#endif

{

#ifdef _POSIX_SOURCE

#undef strerror

    return (strerror(errno));

#else

    static char     msg[40];		/* used for "Unknown error" messages */

    if (errno > 0 && errno < sys_nerr) {

	return (sys_errlist[errno]);

    }

    sprintf(msg, "Unknown error (errno %d)", errno);

    return (msg);

#endif

}

/* prsize - print a file offset on a file stream

 *

 * DESCRIPTION

 *

 *	Prints a file offset to a specific file stream.  The file offset is

 *	of the form "%dm+%dk+%d", where the number preceeding the "m" and

 *	the "k" stand for the number of Megabytes and the number of

 *	Kilobytes, respectivley, which have been processed so far.

 *

 * PARAMETERS

 *

 *	FILE  *stream	- Stream which is to be used for output 

 *	OFFSET size	- Current archive position to be printed on the output 

 *			  stream in the form: "%dm+%dk+%d".

 *

 */

#ifdef __STDC__

static void prsize(FILE *stream, OFFSET size)

#else

static void prsize(stream, size)

FILE           *stream;		/* stream which is used for output */

OFFSET          size;		/* current archive position to be printed */

#endif

{

    OFFSET          n;

    if (n = (size / (1024L * 1024L))) {

	fprintf(stream, "%ldm+", n);

	size -= n * 1024L * 1024L;

    }

    if (n = (size / 1024L)) {

	fprintf(stream, "%ldk+", n);

	size -= n * 1024L;

    }

    fprintf(stream, "%ld", size);

}

/* fatal - print fatal message and exit

 *

 * DESCRIPTION

 *

 *	Fatal prints the program's name along with an error message, then

 *	exits the program with a non-zero return code.

 *

 * PARAMETERS

 *

 *	char 	*why	- description of reason for termination 

 *		

 * RETURNS

 *

 *	Returns an exit code of 1 to the parent process.

 */

#ifdef __STDC__

void fatal(char *why)

#else

void fatal(why)

char           *why;		/* description of reason for termination */

#endif

{

    fprintf(stderr, "%s: %s\n", myname, why);

    exit(1);

}

/* warn - print a warning message

 *

 * DESCRIPTION

 *

 *	Print an error message listing the program name, the actual error

 *	which occurred and an informational message as to why the error

 *	occurred on the standard error device.  The standard error is

 *	flushed after the error is printed to assure that the user gets

 *	the message in a timely fasion.

 *

 * PARAMETERS

 *

 *	char *what	- Pointer to string describing what failed.

 *	char *why	- Pointer to string describing why did it failed.

 */

#ifdef __STDC__

void warn(char *what, char *why)

#else

void warn(what, why)

char           *what;		/* message as to what the error was */

char           *why;		/* explanation why the error occurred */

#endif

{

    fprintf(stderr, "%s: %s : %s\n", myname, what, why);

    fflush(stderr);

}