// ****************************************************************
// * The main function puts everything together so that the shell *
// * can work. *
// ****************************************************************
int main(int argc, char **argv, char **envp)
{
int fd, i;
char c;
char *input_str = calloc(BUFFERSIZE, sizeof(char*));
char *cmd = calloc(BUFFERSIZE, sizeof(char*));
// ignore the standard interrupt signal (ctrl+c)
signal(SIGINT, SIG_IGN);
// assign interrupt signal (ctrl+c) to the signal handler function
signal(SIGINT, sig_hdlr);
// prepare screen and fetch necessary data
initilize(envp);
// main loop might be stopped by typing 'quit', 'exit' or by pressing 'ctrl+d'
while(strcmp(input_str, QUIT_CMD) != 0 && strcmp(input_str, EXIT_CMD) != 0 && c != EOF) {
// get input
c = getchar();
// this switch-case statement read and prepare the input string
switch(c) {
case NEWLINE_SYMBOL:
// if no command is inserted, just print the prompt again
if(input_str[0] != NULL_SYMBOL) {
// erase cmd variable
memset(cmd, 0, BUFFERSIZE);
// parse the command line
cmd = prepare_inputs(input_str);
// special case: change directory call
if(strncmp(cmd, CD, 2) == 0) {
cd(inputs[1]);
// all other command calls
} else {
get_cmd_pth(cmd);
cmd_exec(cmd, envp);
}
free_arr(inputs);
}
// print the prompt again after hitting enter
print_prompt();
memset(input_str, 0, BUFFERSIZE);
break;
default:
// prepare the input string
strncat(input_str, &c, 1);
break;
}
}
// free allocated memories
free(cmd);
free(input_str);
free_arr(paths);
// print new line if 'ctrl+d' is pressed
if(c == EOF) printf(NEWLINE_STR);
// end of main
return 0;
}
void BSSRDF::evaluate_inputs(
const ShadingContext& shading_context,
InputEvaluator& input_evaluator,
const ShadingPoint& shading_point,
const size_t offset) const
{
input_evaluator.evaluate(get_inputs(), shading_point.get_uv(0), offset);
prepare_inputs(input_evaluator.data() + offset);
}
// ****************************************************************
// * This function clears the screen, for our new shell to open *
// * and prints the prompt for the first time. *
// * Also, it gets all the paths where the system commands may be *
// * stored, by calling get_paths(). *
// ****************************************************************
void initilize(char **envp)
{
char *cmd = calloc(BUFFERSIZE, sizeof(char*));
get_paths(envp);
cmd = prepare_inputs(CLEAR);
get_cmd_pth(cmd);
cmd_exec(cmd, envp);
sig_hdlr(0);
free_arr(inputs);
}
void* BSDF::evaluate_inputs(
const ShadingContext& shading_context,
const ShadingPoint& shading_point) const
{
void* data = shading_context.get_arena().allocate(compute_input_data_size());
get_inputs().evaluate(
shading_context.get_texture_cache(),
shading_point.get_uv(0),
data);
prepare_inputs(
shading_context.get_arena(),
shading_point,
data);
return data;
}
