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rgbhex.c
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rgbhex.c
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/* rgbhex.c
*
* Copyright (c) 2005, 2010 Victor Nilsson <victor@victornils.net>
*
* 2010-03-20 Fixed array size bugs
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int hexdigit(char c);
char *substr(char *src, int pos, int len, char *dest);
void set_rgbadd(int *rgb, int *rgbadd, int add, int perc);
void count_print(char *hexstr, int *rgbadd);
int main (int argc, char **argv)
{
const char *usage = "Usage: rgbhex RRGGBB [-rgb] [INTEGER[%]]...\n"
"Changes a hexadecimal RGB color value.\n"
"\n"
"Examples:\n"
" rgbhex B505F5 5 # Returns BA0AFA\n"
" rgbhex B505F5 -rg 7 # Returns BC0CF5\n"
" rgbhex B505F5 -g7 -rb-16 # Returns A50CE5\n";
if (argc == 1 || !strcmp(argv[1], "--help")) {
puts(usage);
return 0;
}
int rgb[2];
int rgbadd[] = { 0, 0, 0, 0, 0, 0 };
char add_str[3];
int add;
int perc;
int length;
int i, j;
for (i = 2; i < argc; i++) {
rgb[0] = rgb[1] = rgb[2] = 0;
perc = 0;
if (argv[i][1] <= '9') {
if (add != 1000)
rgb[0] = rgb[1] = rgb[2] = 1;
length = strlen(argv[i]);
if (argv[i][length-1] == '%') {
substr(argv[i], 0, -1, add_str);
add = atoi(add_str);
perc = 1;
}
else
add = atoi(argv[i]);
if (add == 0) {
puts(usage);
return 1;
}
set_rgbadd(rgb, rgbadd, add, perc);
add = 0;
}
else {
add = 1000;
length = strlen(argv[i]);
for (j = 1; j < length; j++) {
if (add != 1000)
break;
switch (argv[i][j]) {
case 'r':
rgb[0] = 1;
break;
case 'g':
rgb[1] = 1;
break;
case 'b':
rgb[2] = 1;
break;
default:
if (argv[i][length-1] == '%') {
substr(argv[i], j, -1, add_str);
perc = 1;
}
else
substr(argv[i], j, 0, add_str);
add = atoi(add_str);
if (add == 0) {
puts(usage);
return 1;
}
set_rgbadd(rgb, rgbadd, add, perc);
}
}
}
}
count_print(argv[1], rgbadd);
return 0;
}
int hexdigit(char c)
{
char ch[2];
switch (c) {
case 'A': case 'a': return 10;
case 'B': case 'b': return 11;
case 'C': case 'c': return 12;
case 'D': case 'd': return 13;
case 'E': case 'e': return 14;
case 'F': case 'f': return 15;
default:
ch[0] = c;
ch[1] = '\0';
return atoi(ch);
}
}
char *substr(char *src, int pos, int len, char *dst)
{
int srclen;
int i;
srclen = strlen(src);
if (srclen <= pos) {
if (dst)
dst = NULL;
return NULL;
}
if (pos < 0) {
pos = srclen + pos;
if (pos < 0)
pos = 0;
}
if (len > srclen)
len = srclen - pos;
else if (len < 1) {
len = srclen - pos + len;
if (len < 1) {
if (!dst)
dst = (char *) malloc(1);
dst[0] = '\0';
return dst;
}
}
if (!dst)
dst = (char *) malloc(len+1);
for (i = 0; i < len; i++)
dst[i] = src[pos+i];
dst[i] = '\0';
return dst;
}
void set_rgbadd(int *rgb, int *rgbadd, int add, int perc)
{
int i;
for (i = 0; i < 3; i++)
if (rgb[i]) {
if (perc)
rgbadd[i*2+1] = add;
else
rgbadd[i*2] = add;
}
return;
}
void count_print(char *hexstr, int *rgbadd)
{
char *hexchr = "0123456789ABCDEF";
int rgb[3];
int i;
for (i = 0; i < 3; i++) {
rgb[i] = hexdigit(hexstr[i*2])*16 + hexdigit(hexstr[i*2+1]);
if (rgbadd[i*2])
rgb[i] += rgbadd[i*2];
if (rgbadd[i*2+1])
rgb[i] += (int) (rgb[i] * rgbadd[i*2+1] / (float) 100);
if (rgb[i] > 255)
rgb[i] = 255;
else if (rgb[i] < 0)
rgb[i] = 0;
printf("%c%c", hexchr[rgb[i]/16], hexchr[rgb[i]%16]);
}
printf("\n");
return;
}