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/* -*- c -*-
* Time-stamp: <2007-06-19 00:20:12 rsmith>
*
* stl2pov/utils.c
* Copyright © 2004--2007 R.F. Smith <rsmith@xs4all.nl>.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <assert.h>
#include <math.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "macros.h"
#include "utils.h"
#ifndef PACKAGE
#error You must define PACKAGE as the name of the application!
#endif
void fatal(const char *fmt, ...)
{
va_list ap;
assert(fmt != NULL);
va_start(ap, fmt);
fputs(PACKAGE" error: ", stderr);
vfprintf(stderr, fmt, ap);
exit(EXIT_FAILURE);
}
void warning(const char *fmt, ...)
{
va_list ap;
assert(fmt != NULL);
va_start(ap, fmt);
fputs(PACKAGE" warning: ", stderr);
vfprintf(stderr, fmt, ap);
}
char *ftobuf(const char *name, unsigned *l)
{
char *b = NULL;
FILE *f;
size_t rdsize;
unsigned bl = 0;
assert(name != NULL);
f = fopen(name, "r");
if (f == NULL) {
warning("Could not open %s.\n", name);
return NULL;
}
fseek(f, 0, SEEK_END);
bl = ftell(f);
rewind(f);
if (bl == -1) {
fclose(f);
warning("Could not determine the size of %s.\n", name);
return NULL;
}
b = malloc(bl+1); /* for an extra zero at the end. */
if (b == NULL) {
fclose(f);
warning("Could not allocate %d bytes of memory for %s.\n",
bl, name);
return NULL;
}
rdsize = fread(b, 1, bl, f);
if (ferror(f)) {
fclose(f);
free(b);
warning("Could not read %s.\n", name);
return NULL;
}
bl = (unsigned)rdsize;
b[bl] = 0;
if (l!=NULL) {
*l = bl;
}
fclose(f);
return b;
}
void normalize(float xyz[3])
{
float len = sqrtf(xyz[0]*xyz[0]+xyz[1]*xyz[1]+xyz[2]*xyz[2]);
xyz[0] /= len;
xyz[1] /= len;
xyz[2] /= len;
}
float cosphi(const float a[3], const float b[3])
{
float t, n;
t = a[0]*b[0]+a[1]*b[1]+a[2]*b[2];
n = sqrtf(a[0]*a[0]+a[1]*a[1]+a[2]*a[2])
* sqrtf(b[0]*b[0]+b[1]*b[1]+b[2]*b[2]);
return t/n;
}
/* EOF utils.c */
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