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misc.c
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/*
* Copyright (c) 1991, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* 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 the University of California, Lawrence Berkeley Laboratory,
* Berkeley, CA. The name of the University may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* This code is derived from the original X10 xgraph written by
* David Harrison University of California, Berkeley 1986, 1987
*
* Heavily hacked by Van Jacobson and Steven McCanne, UCB/LBL: added mouse
* functions to id points and compute slopes and distances. added keystroke
* commands to toggle most of the visual attributes of a window (grid, line,
* markers, etc.).
*/
#include <math.h>
#include <string.h>
#include <stdio.h>
/*
* Writes the value provided into the string in a fixed format consisting of
* seven characters. The format is: -ddd.dd
*/
void
WriteValue(str, val, expn)
char *str; /* String to write into */
double val; /* Value to print */
int expn; /* Exponent */
{
int index;
if (expn < 0) {
for (index = expn; index < 0; index++)
val *= 10.0;
} else {
for (index = 0; index < expn; index++)
val /= 10.0;
}
(void)sprintf(str, "%.2f", val);
}
#define nlog10(x) (x == 0.0 ? 0.0 : log10(x))
/*
* This routine rounds up the given positive number such that it is some
* power of ten times either 1, 2, or 5. It is used to find increments for
* grid lines.
*/
double
RoundUp(val)
double val;
{
int exponent, index;
exponent = (int) floor(nlog10(val));
if (exponent < 0) {
for (index = exponent; index < 0; index++) {
val *= 10.0;
}
} else {
for (index = 0; index < exponent; index++) {
val /= 10.0;
}
}
if (val > 5.0)
val = 10.0;
else if (val > 2.0)
val = 5.0;
else if (val > 1.0)
val = 2.0;
else
val = 1.0;
if (exponent < 0)
for (index = exponent; index < 0; index++)
val /= 10.0;
else
for (index = 0; index < exponent; index++)
val *= 10.0;
return (val);
}
/*
* This routine masks off any decimal digits below the given exponent.
* It is used to calculate the offset value for grid labels when needed.
*/
double
MaskDigit(arg, exponent)
double *arg;
int exponent;
{
double base, val;
int index;
val = *arg;
if (exponent < 0) {
for (index = exponent; index < 0; index++) {
val *= 10.0;
}
} else {
for (index = 0; index < exponent; index++) {
val /= 10.0;
}
}
if (val < 0)
val = -floor(-val);
else
val = floor(val);
base = val;
if (exponent < 0)
for (index = exponent; index < 0; index++)
val /= 10.0;
else
for (index = 0; index < exponent; index++)
val *= 10.0;
*arg = val;
return (base);
}
char *
stripdir(s)
char *s;
{
char *cp = strrchr(s, '/');
return (cp != 0) ? cp + 1 : s;
}