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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#define CHAR_MAX_LENGTH 1000
#define INVITE_SYMBOL "shell>"
int Ndelimiteur(char *string_in){
int i, l = 0, n = 0, len = strlen(string_in) + 1;
char delimiter = ' ';
for(i = 0; i < len; i++){
if( !( (string_in[i] != '\0') && (string_in[i] != delimiter)) ){
n++;
}
}
return n;
}
void delimiteur(char *string_in, char *string_out, int nbr)
{
char c = ' ';
int i, l = 0, n = 0, len = strlen(string_in) + 1;
for (i = 0; i < len; i++) {
if ((string_in[i] != '\0') && (string_in[i] != c)) {
string_out[l] = string_in[i];
l++;
} else {
if (l > 0) {
string_out[l] = 0;
l = 0;
if (n == nbr)
return;
n++;
}
}
}
}
void quitt(){
fprintf(stdout,"========== CLOSING COURSE ==========\n");
fprintf(stdout,"3\n"); sleep(1);
fprintf(stdout,"2\n"); sleep(1);
fprintf(stdout,"1\n"); sleep(1);
}
int main(int argc, char *argv[]){
char exiting[5] = { 0 };
int i, n;
char buff_in[CHAR_MAX_LENGTH] = {0};
/* COMMAND ELEMENT */
char user_string[CHAR_MAX_LENGTH] = {0};
//char command[50] = {0};
while(1){
write(STDOUT_FILENO, INVITE_SYMBOL, sizeof(INVITE_SYMBOL));
read(STDIN_FILENO,buff_in, sizeof(buff_in));
// QUIT THE PROGRAMM IF USER's STRING IS quit OR exit
strncpy(exiting, buff_in, 4); //copy 4th first char
if( (strcmp(exiting, "exit") == 0) || (strcmp(exiting, "quit") == 0) ){
if(atexit(quitt) == -1){
perror("Error while closing programm");
}
break;
}
//fprintf(stdout, "%s",buff_in);
/* GET COMMAND */
n = Ndelimiteur(buff_in);
char *param[n+1];
for(i = 0; i < n; i++){
/*
on place successivement dans user_string les chaines
de caractères de buff_in dès que nous rencontrons un caractère espace
*/
delimiteur(buff_in, user_string, i);
//fprintf(stdout, "user string: %s", user_string);
param[i] = strdup(user_string);
}
param[n] = NULL;
execvp(param[0], param);
fprintf(stderr, "Error %d\n", errno);
}
return EXIT_SUCCESS;
} |
Executer une commande linux dans son propre shell
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