Hi guys...
Macbook Pro, 13", circa August 2012, OSX 10.7.5, default bash terminal.
I require the capability to convert +32767 to -32768 into signed hex words...
The example piece code below works perfectly except...
Code:
#/bin/bash
# sign.sh
# Unsign to sign...
while true
do
# I have used $(( ~n )), where n is a positive integer too.
# Test piece only hence no error checking at all.
read -p "Enter negative number -1 to -32768:- " num
if [ $num -le -1 ]
then
printf "$[ ( $num + 65536 ) ]\n"
else
printf "Zero or positive value entered, $num.\n"
fi
# Why a 64 bit _hex_ value here?
hex=$(printf "%04X\n" $num)
printf "$hex\n"
# I have to use this to correct.
if [ ${#hex} -gt 4 ]
then
hex="${hex:$[ ( ${#hex} - 4 ) ]:4}"
fi
printf "$hex\n"
done
Results:-
Code:
Last login: Sun Jun 8 19:52:33 on ttys000
AMIGA:barrywalker~> ./sign.sh
Enter negative number -1 to -32768:- 0
Zero or positive value entered, 0.
0000
0000
Enter negative number -1 to -32768:- 1
Zero or positive value entered, 1.
0001
0001
Enter negative number -1 to -32768:- -1
65535
FFFFFFFFFFFFFFFF
FFFF
Enter negative number -1 to -32768:- 32767
Zero or positive value entered, 32767.
7FFF
7FFF
Enter negative number -1 to -32768:- -32768
32768
FFFFFFFFFFFF8000
8000
Enter negative number -1 to -32768:- ^CAMIGA:barrywalker~>
AMIGA:barrywalker~> _
My question is this:-
Why does the line hex=$(printf "%04X\n" $num) not truncate the hex
string to 4 characters?
I have tried, %04X, %02X and %X along with $num and "$num" but I still have to use the extra code to correct to 4 hex characters.
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LEARN ABOUT SUNOS
mlib_imagecolorhsl2rgb
mlib_ImageColorHSL2RGB(3MLIB) mediaLib Library Functions mlib_ImageColorHSL2RGB(3MLIB)NAME
mlib_ImageColorHSL2RGB - HSL to RGB color conversion
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageColorHSL2RGB(mlib_image *dst, const mlib_image *src);
DESCRIPTION
The mlib_ImageColorHSL2RGB() function performs a conversion from hue/saturation/lightness to red/green/blue. The source and destination
images must be three-channel images.
It uses the following equations:
L' = L if L <= 1/2
L' = 1 - L if L > 1/2
V = L + S*L'
P = L - S*L'
Q = L + S*L'*(1 - 2*fraction(H*6))
T = L - S*L'*(1 - 2*fraction(H*6))
R, G, B = V, T, P if 0 <= H < 1/6
R, G, B = Q, V, P if 1/6 <= H < 2/6
R, G, B = P, V, T if 2/6 <= H < 3/6
R, G, B = P, Q, V if 3/6 <= H < 4/6
R, G, B = T, P, V if 4/6 <= H < 5/6
R, G, B = V, P, Q if 5/6 <= H < 1
where 0 <= H < 1 and 0 <= S, L, L', V, P, Q, T, R, G, B <= 1.
Assuming a pixel in the source image is (h, s, l) and its corresponding pixel in the destination image is (r, g, b), then for MLIB_BYTE
images, the following applies:
H = h/256
S = s/255
L = l/255
r = R*255
g = G*255
b = B*255
for MLIB_SHORT images, the following applies:
H = (h + 32768)/65536
S = (s + 32768)/65535
L = (l + 32768)/65535
r = R*65535 - 32768
g = G*65535 - 32768
b = B*65535 - 32768
for MLIB_USHORT images, the following applies:
H = h/65536
S = s/65535
L = l/65535
r = R*65535
g = G*65535
b = B*65535
and for MLIB_INT images, the following applies:
H = (h + 2147483648)/4294967296
S = (s + 2147483648)/4294967295
L = (l + 2147483648)/4294967295
r = R*4294967295 - 2147483648
g = G*4294967295 - 2147483648
b = B*4294967295 - 2147483648
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO mlib_ImageColorHSL2RGB_Fp(3MLIB), mlib_ImageColorRGB2HSL(3MLIB), mlib_ImageColorRGB2HSL_Fp(3MLIB), attributes(5)SunOS 5.10 10 Nov 2004 mlib_ImageColorHSL2RGB(3MLIB)