Pliki_SOP/Microshell/microshell.c

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2.4 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>
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const int max = 1000;
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int cut(char **argv, char *command){
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int i = 0, w = 0, x = 0;
char argument[100];
while (1){
if(command[i] == 10){
argv[w] = NULL;
break;
}
else if (command[i] == 32){
i+=1;
x=0;
continue;
}
else{
while(command[i] != 32 && command[i]!=10){
argument[x]=command[i];
x+=1;
i+=1;
}
argument[x] = '\0';
argv[w]=malloc(x+1 * sizeof(char));
strcpy(argv[w], argument);
w+=1;
}
}
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return w+1;
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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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int main (){
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int ile, i, spath = 1;
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while (1){
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char* argv[100];
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char komenda[max], directory[max];
if (getcwd(directory, sizeof(directory)) == NULL){
perror("getcwd() error");
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return -1;
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}
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struct passwd *p = getpwuid(getuid());
/*dodac obsluge bledow do get?*/
if (spath)
printf("[%s]", directory);
printf("%s$ ", p->pw_name); /* mozna zrobic (*p).pw_name */
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fgets(komenda, max, stdin);
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ile = 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")){
if (fork() == 0){
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execlp("less", "less", "help", NULL);
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perror("execlp");
exit(EXIT_FAILURE);
}
else
wait(NULL);
}
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else if (!strcmp(argv[0], "exit"))
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break;
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else
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if (fork() == 0){
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execvp(argv[0], argv);
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perror("execvp");
exit(EXIT_FAILURE);
}
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else
wait(NULL);
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for(i=0; i<ile; i++)
free(argv[i]);
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}
return 0;
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}