ref: 4c21da2ededfb5fc628dbee0d75b0aa5263ef97b
dir: /sys/src/ape/cmd/pax/warn.c/
/* $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);
}