Pliki_SOP/Microshell/microshell.c

196 lines
4.0 KiB
C
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#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
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#include <sys/types.h>
#include <sys/wait.h>
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#include <dirent.h>
#include <errno.h>
#include <pwd.h>
#include <readline/readline.h>
#include <readline/history.h>
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const int max = 1000;
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void cut(char **argv, char *command){
int w = 0;
char sep[] = " ";
char *ptr = strtok(command, sep);
while (ptr != NULL){
argv[w]=ptr;
w+=1;
ptr = strtok(NULL, sep);
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}
argv[w]=NULL;
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}
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void cd (char **argv){
if(argv[1] == NULL){
printf("Add arguments\n");
return;
}
else if(argv[2] != NULL){
printf("Too many arguments\n");
return;
}
else{
if (chdir(argv[1]) != 0)
perror("chdir error");
return;
}
}
void spathf (char **argv, int *spath){
int l;
if (argv[1] == NULL){
printf("Add arguments\n");
return;
}
else if (argv[2] != NULL){
printf("Too many arguments\n");
return;
}
else if (!strcmp(argv[1], "help")){
printf("Arguments:\n0 turns off path showing\n1 turns on path showing\n");
return;
}
l = argv[1][0] - '0';
if (argv[1][1] != 0 || l < 0 || l > 1){
printf("Wrong number\n");
return;
}
else
*spath = l;
}
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void help (char **argv){
if (fork() == 0){
execlp("less", "less", "help", NULL);
perror("execlp");
exit(EXIT_FAILURE);
}
else
wait(NULL);
}
void exe (char **argv){
if (fork() == 0){
execvp(argv[0], argv);
perror("execvp");
exit(EXIT_FAILURE);
}
else
wait(NULL);
}
void tree (char **argv, char * directory){
if (argv[1] != NULL && argv[2] != NULL){
printf("Too many arguments\nshowtree takes no arguments \nor exacly 1 argument for desired directory\n");
return;
}
else if (argv[1] != NULL && argv[2] == NULL){
printf("Dokladnie 1 arg\n");
return;
}
else{
if (fork() == 0){
DIR *d;
struct dirent *ent;
char ndr[max], lastdir[max];
strcpy(ndr, directory);
while(1){
strcpy(lastdir, ndr);
if ((d = opendir(ndr)) != NULL){ /*wchodzimy do katalogu*/
while ((ent = readdir(d)) != NULL){ /*czytamy zawartosc*/
char *name = ent->d_name;
if (!(!strcmp(name, ".") || !strcmp(name, ".."))){ /*jesli nazwa rozna od . lub .. */
if (chdir(name) == 0){ /*udalo nam sie wejsc do katalogu*/
closedir(d);
printf("Katalog: %s\n", name);
getcwd(ndr, sizeof(ndr)); /*zmieniamy directory*/
break; /*break czytanie poprzedniego katalogu*/
}
else
printf("Plik: %s\n", name);
}
}
}
if (!strcmp(lastdir, ndr))
break; /*jezeli nie zmienilismy kat to wychodzimy zeby nie czytac tego samego jeszcze raz*/
}
exit(0);
}
else{
wait(NULL);
return;
}
}
}
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int main (){
int spath = 1;
using_history();
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struct passwd *p = getpwuid(getuid());
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while (1){
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char *argv[100];
char *komenda, *prompt, directory[max];
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if (getcwd(directory, sizeof(directory)) == NULL){
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perror("getcwd() error");
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return -1;
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}
if (spath){
prompt = (char*)malloc(strlen(directory)+strlen(p->pw_name)+22 *sizeof(char));
prompt[0]='\0';
strcat(prompt, "\033[1;32m");
strcat(prompt, "[");
strcat(prompt, directory);
strcat(prompt, "]\033[0m");
strcat(prompt, p->pw_name);
}
else{
prompt = (char*)malloc(strlen(p->pw_name)+3 *sizeof(char));
strcat(prompt, p->pw_name);
}
strcat(prompt, "$ ");
if (!(komenda = readline(prompt)))
break;
if (komenda[0] == 0)
continue;
add_history(komenda);
cut(argv, komenda);
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if (argv[0]==NULL)
continue;
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else if (!strcmp(argv[0], "spath")){
spathf(argv, &spath);
continue;
}
else if (!strcmp(argv[0], "cd")){
cd(argv);
continue;
}
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else if (!strcmp(argv[0], "help")){
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help(argv);
continue;
}
else if (!strcmp(argv[0], "showtree")){
tree(argv, directory);
continue;
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}
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else if (!strcmp(argv[0], "exit"))
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break;
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else
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exe(argv);
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free(komenda);
free(prompt);
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}
return 0;
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}