strerror.c   [plain text]


/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
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 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
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/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */


#include <string.h>

#define	UPREFIX	"Unknown error: "
static char ebuf[40] = UPREFIX;		/* 64-bit number + slop */

char *
strerror(num)
	int num;
{
	extern const int sys_nerr;
	extern const char *const sys_errlist[];
	register unsigned int errnum;
	register char *p, *t;
	char tmp[40];

	errnum = num;				/* convert to unsigned */
	if (errnum < sys_nerr)
		return((char*)sys_errlist[errnum]);

	/* Do this by hand, so we don't include stdio(3). */
	t = tmp;
	do {
		*t++ = "0123456789"[errnum % 10];
	} while (errnum /= 10);
	for (p = ebuf + sizeof(UPREFIX) - 1;;) {
		*p++ = *--t;
		if (t <= tmp)
			break;
	}
	return(ebuf);
}