/*
 * Copyright (c) 2002 Juli Mallett.  All rights reserved.
 * Copyright (c) 1988, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    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.
 *
 * $FreeBSD: src/usr.bin/make/util.c,v 1.5.2.2 2001/02/13 03:13:58 will Exp $
 * $DragonFly: src/usr.bin/make/util.c,v 1.13 2005/01/22 11:14:30 okumoto Exp $
 */

#include <sys/stat.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "globals.h"
#include "job.h"
#include "targ.h"
#include "util.h"

static void enomem(void);

/*-
 * Debug --
 *	Print a debugging message given its format.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	The message is printed.
 */
/* VARARGS */
void
Debug(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fflush(stderr);
}

/*-
 * Error --
 *	Print an error message given its format.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	The message is printed.
 */
/* VARARGS */
void
Error(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fprintf(stderr, "\n");
	fflush(stderr);
}

/*-
 * Fatal --
 *	Produce a Fatal error message. If jobs are running, waits for them
 *	to finish.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	The program exits
 */
/* VARARGS */
void
Fatal(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	if (jobsRunning)
		Job_Wait();

	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fprintf(stderr, "\n");
	fflush(stderr);

	if (DEBUG(GRAPH2))
		Targ_PrintGraph(2);
	exit(2);		/* Not 1 so -q can distinguish error */
}

/*
 * Punt --
 *	Major exception once jobs are being created. Kills all jobs, prints
 *	a message and exits.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	All children are killed indiscriminately and the program Lib_Exits
 */
/* VARARGS */
void
Punt(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	fprintf(stderr, "make: ");
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fprintf(stderr, "\n");
	fflush(stderr);

	DieHorribly();
}

/*-
 * DieHorribly --
 *	Exit without giving a message.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	A big one...
 */
void
DieHorribly(void)
{
	if (jobsRunning)
		Job_AbortAll();
	if (DEBUG(GRAPH2))
		Targ_PrintGraph(2);
	exit(2);		/* Not 1, so -q can distinguish error */
}

/*
 * Finish --
 *	Called when aborting due to errors in child shell to signal
 *	abnormal exit, with the number of errors encountered in Make_Make.
 *
 * Results:
 *	None
 *
 * Side Effects:
 *	The program exits
 */
void
Finish(int errors)
{

	Fatal("%d error%s", errors, errors == 1 ? "" : "s");
}

/*
 * emalloc --
 *	malloc, but die on error.
 */
void *
emalloc(size_t len)
{
	void *p;

	if ((p = malloc(len)) == NULL)
		enomem();
	return (p);
}

/*
 * estrdup --
 *	strdup, but die on error.
 */
char *
estrdup(const char *str)
{
	char *p;

	if ((p = strdup(str)) == NULL)
		enomem();
	return (p);
}

/*
 * erealloc --
 *	realloc, but die on error.
 */
void *
erealloc(void *ptr, size_t size)
{

	if ((ptr = realloc(ptr, size)) == NULL)
		enomem();
	return (ptr);
}

/*
 * enomem --
 *	die when out of memory.
 */
static void
enomem(void)
{
	err(2, NULL);
}

/*
 * enunlink --
 *	Remove a file carefully, avoiding directories.
 */
int
eunlink(const char *file)
{
	struct stat st;

	if (lstat(file, &st) == -1)
		return (-1);

	if (S_ISDIR(st.st_mode)) {
		errno = EISDIR;
		return (-1);
	}
	return (unlink(file));
}