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shell.c
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shell.c
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#include "headers.h"
// int current_fg_pid = -1;
int exec_command(char* input, char* starting_working_directory){
// printf("what\n");
char* words[1000];
int length_current_command = strlen(input);
words[0] = strtok(input, " ");
// index will ccontain the number of arguments +1
int index = 1;
int return_value=0;
while(words[index-1]!=NULL){
words[index] = strtok(NULL, " ");
index++;
}
if(words[0]==NULL){}
else if(length_current_command==1){}
else if(strcmp(words[0],"quit")==0){
int outcome = exit_shell();
if(outcome==0){
exit(0);
}
else{
fprintf(stderr,"couldnt quit\n");
return_value=1;
}
// return 0;
}
else if(strcmp(words[0],"overkill")==0){
int outcome = exit_shell();
if(outcome!=0){
fprintf(stderr,"couldnt kill all processes");
return_value=1;
}
}
else if(strcmp(words[0],"pwd")==0){
return_value=print_pwd(starting_working_directory);
printf("\n");
}
else if(strcmp(words[0],"echo")==0){
return_value=echo_string(words, index-1, input);
}
else if(strcmp(words[0],"cd")==0){
return_value = change_dir(words, index-1,starting_working_directory);
// if(k==1){
// printf("too many arguments");
// }
}
else if(strcmp(words[0],"ls")==0){
// printf("bruh\n");
return_value=list(words, index-1,starting_working_directory);
}
else if(strcmp(words[0],"pinfo")==0){
return_value=print_pinfo(words, index-1, 0);
}
else if(strcmp(words[0],"nightswatch")==0){
// printf("bruh\n");
return_value=handle_night(words,index-1,starting_working_directory,input);
}
else if(strcmp(words[0],"setenv")==0){
return_value=to_set_env(words,index-1);
}
else if(strcmp(words[0],"unsetenv")==0){
return_value=to_unset_env(words,index-1);
}
else if(strcmp(words[0],"jobs")==0){
// printf("jobs\n");
return_value=jobs(words,index-1);
}
else if(strcmp(words[0],"kjob")==0){
return_value=kjob(words,index-1);
}
else if(strcmp(words[0],"fg")==0){
return_value=bring_fg(words,index-1);
}
else if(strcmp(words[0],"bg")==0){
return_value=bring_bg(words,index-1);
}
else if(strcmp(words[0],"history")==0){
int number = 10;
int valid = 1;
if(index-1>1){
if(strlen(words[1])>2){
valid = 0;
fprintf(stderr,"not the right argument");
return_value=1;
}
else if(strlen(words[1])==1){
int ones = (int)words[1][0] - (int)'0';
if(ones<0 || ones>9){
valid = 0;
fprintf(stderr,"not the right argument");
return_value=1;
}
else{
number = ones;
}
}
else{
int tens = (int)words[1][0] - (int)'0';
int ones = (int)words[1][1] - (int)'0';
if(tens<0 || tens>9){
valid = 0;
fprintf(stderr,"not the right argument");
return_value=1;
}
else if(ones<0 || ones>9){
valid = 0;
fprintf(stderr,"not the right argument");
return_value=1;
}
else{
number = tens*10 + ones;
}
}
}
if(valid){
return_value=print_history( number, starting_working_directory);
}
}
else{
if(strcmp(words[index-2] , "&")!=0){
// for(int i=0;i<2;i++){
// printf("%s\n",words[i]);
// }
// printf("fg");
// printf("%s\n",input);
return_value = fg(words, index-1,starting_working_directory);
}
else{
// printf("back\n");
return_value = bg(words, index-1,starting_working_directory,input);
}
}
return return_value;
}
int main(){
our_gpid = (int*)malloc(sizeof(int));
*our_gpid = getpid();
second_dir_has_happened = (int*)malloc(sizeof(int));
*second_dir_has_happened = 0;
int Standard_in = dup(STDIN_FILENO);
int Standard_out = dup(STDOUT_FILENO);
current_fg_pid = (int*)malloc(sizeof(int));
*current_fg_pid = -1;
first_bg = (struct bg_process*)malloc(sizeof(struct bg_process));
first_bg->previous = NULL;
first_bg->next = NULL;
first_bg->pid = -10;
// first_bg->command = NULL;
char starting_working_directory[1024];
getcwd(starting_working_directory, 1024);
// printf("%s",starting_working_directory);
char okay[100];
char* commmand_line_line;
commmand_line_line = (char *)malloc(1000*sizeof(char));
size_t linecap = 0;
char* input[100];
define_all_signals();
// input = (char *)malloc(1000*sizeof(char));
while(1){
// printf("starting\n");
print_prompt(starting_working_directory);
int linelen = getline(&commmand_line_line, &linecap, stdin);
if(linelen==-1){
int outcome = exit_shell();
if(outcome==0){
return 0;
}
else{
printf("couldn't exit\n");
}
}
int length_input = strlen(commmand_line_line);
commmand_line_line[length_input-1] = '\0';
add_history(commmand_line_line,starting_working_directory);
input[0] = strtok(commmand_line_line,";");
int input_index = 1;
while(input[input_index-1]!=NULL){
input[input_index] = strtok(NULL,";");
input_index++;
}
input_index--;
// input contains the the command separated by semicolons
// now we take each of these, and seperate by
char* piped[1000];
int statusfor_2 = 0;
for(int w = 0;w<input_index;w++){
piped[0] = strtok(input[w], "|");
int piped_size=1;
while(piped[piped_size-1]!=NULL){
piped[piped_size] = strtok(NULL,"|");
piped_size++;
}
piped_size--;
// piped comtains the commands broken by pipes
for(int pip=0;pip<piped_size;pip++){
int flag[2];
pipe(flag);
if(pip<piped_size-1){
dup2(flag[1],STDOUT_FILENO);
}
else{
dup2(Standard_out,STDOUT_FILENO);
}
close(flag[1]);
char input_file[1000],output_file[1000];
int input_flag=0;
int output_flag=0;
int status = redirection(piped[pip],input_file, output_file, &input_flag, &output_flag);
if(status!=1){
statusfor_2 = exec_command(piped[pip],starting_working_directory);
}
else{
statusfor_2 = 1;
}
dup2(flag[0],STDIN_FILENO);
close(flag[0]);
}
dup2(Standard_in,STDIN_FILENO);
dup2(Standard_out,STDOUT_FILENO);
}
if(statusfor_2){
printf(":'(");
}
else{
printf(":')");
}
}
}