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lerpc.c
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lerpc.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int *str_to_color(const char *str) {
int len = strlen(str);
int *color = malloc((len-1)/2);
int j = 0;
char *substr = malloc(3);
for(int i=1; i < len; i=i+2) {
substr[0] = str[i];
substr[1] = str[i+1];
substr[2] = '\0';
sscanf(substr, "%x", &color[j]);
j++;
}
free(substr);
return color;
}
int validate_color_str(const char *str) {
int len = strlen(str);
if(len != 7 || str[0] != 35) {
return 0;
}
for(int i = 1; i < len; i++) {
if(!(str[i] >= 48 && str[i] <= 57) &&
!(str[i] >= 65 && str[i] <= 70) &&
!(str[i] >= 97 && str[i] <= 102)) {
return 0;
}
}
return 1;
}
int main(int argc, char **argv) {
int *a = NULL;
int *b = NULL;
int curr = 0;
int max = 0;
float t = 0;
if(argc < 5) {
fprintf(stderr, "Error: too few arguments\n");
return -1;
}
if(!validate_color_str(argv[1]) || !validate_color_str(argv[2])) {
fprintf(stderr, "Error: invalid color string\n");
return -1;
}
a = str_to_color(argv[1]);
b = str_to_color(argv[2]);
curr = atoi(argv[3]);
max = atoi(argv[4]);
t = (float)curr / max;
if(t > 1.0) {
t = 1.0;
} else if(t < .0) {
t = .0;
}
for(int i=0; i < 3; i++) {
a[i] = (b[i] - a[i]) * t + a[i];
}
printf("#%02x%02x%02x\n", a[0], a[1], a[2]);
free(a);
free(b);
return 0;
}