/* * utils.c *//* * Copyright (C) 2005, Simon Kilvington * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA */#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <string.h>#include <ctype.h>#include <errno.h>#include "utils.h"/* * move str to the next non-white space character (or the end of the string) */char *skip_ws(char *str){	if(str == NULL)		return NULL;	while(*str != '\0' && isspace((int) *str))		str ++;	return str;}/* * returns a single ASCII char for the values 0-15 */charhex_digit(uint8_t val){	/* assert */	if(val > 0xf)		fatal("Not a single hex digit");	return (val < 10) ? '0' + val : 'a' + (val - 10);}/* * I don't want to double the size of my code just to deal with malloc failures * if you've run out of memory you're fscked anyway, me trying to recover is not gonna help... */void *safe_malloc(size_t nbytes){	void *buf;	if((buf = malloc(nbytes)) == NULL)		fatal("Out of memory");	return buf;}/* * safe_realloc(NULL, n) == safe_malloc(n) */void *safe_realloc(void *oldbuf, size_t nbytes){	void *newbuf;	if(oldbuf == NULL)		return safe_malloc(nbytes);	if((newbuf = realloc(oldbuf, nbytes)) == NULL)		fatal("Out of memory");	return newbuf;}/* * safe_free(NULL) is okay */voidsafe_free(void *buf){	if(buf != NULL)		free(buf);	return;}voiderror(char *message, ...){	va_list ap;	va_start(ap, message);	vfprintf(stderr, message, ap);	fprintf(stderr, "\n");	va_end(ap);	return;}voidfatal(char *message, ...){	va_list ap;	va_start(ap, message);	vfprintf(stderr, message, ap);	fprintf(stderr, "\n");	va_end(ap);	exit(EXIT_FAILURE);}/* number of bytes per line */#define HEXDUMP_WIDTH	16voidhexdump(unsigned char *data, size_t nbytes){	size_t nout;	int i;	nout = 0;	while(nout < nbytes)	{		/* byte offset at start of line */		if((nout % HEXDUMP_WIDTH) == 0)			printf("0x%.8x  ", nout);		/* the byte value in hex */		printf("%.2x ", data[nout]);		/* the ascii equivalent at the end of the line */		if((nout % HEXDUMP_WIDTH) == (HEXDUMP_WIDTH - 1))		{			printf(" ");			for(i=HEXDUMP_WIDTH-1; i>=0; i--)				printf("%c", isprint(data[nout - i]) ? data[nout - i] : '.');			printf("\n");		}		nout ++;	}	/* the ascii equivalent if we haven't just done it */	if((nout % HEXDUMP_WIDTH) != 0)	{		/* pad to the start of the ascii equivalent */		for(i=(nout % HEXDUMP_WIDTH); i<HEXDUMP_WIDTH; i++)			printf("   ");		printf(" ");		/* print the ascii equivalent */		nout --;		for(i=(nout % HEXDUMP_WIDTH); i>=0; i--)			printf("%c", isprint(data[nout - i]) ? data[nout - i] : '.');		printf("\n");	}	return;}