Salut les gens ! ! !
Pouvez-vous m'expliquer en gros ce que fait ce petit prog en C...
Merci !
#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<string.h>
#define BUFFSIZE 1024
#define MAXPARAMS 8
char *argv[MAXPARAMS];
int isquit(char *buf);
void tokenize(int nread, char *buf, char *argv[]);
int main(void)
{
int i, nread;
char *prompt = "what> ";
char buf[BUFFSIZE];
while(1)
{ i = 0;
nread = 0;
write(STDOUT_FILENO, prompt, strlen(prompt));
nread = read(STDIN_FILENO, buf, BUFFSIZE);
if (isquit(buf)) break;
tokenize(nread, buf, argv);
if(fork()==0)
{
execvp(argv[0], argv);
exit(0);
}
wait((int *)0);
}
}
int isquit(char *buf)
{
if (buf[0]=='q'&&buf[1]=='u'&
&buf[2]=='i'&&buf[3]=='t'
return 1;
else
return 0;
}
/*break the input into an array of strings for exec*/
void tokenize(int nread, char *buf, char *argv[MAXPARAMS])
{
int i, j, k, len;
i = 0;
k = 0;
while (i < nread)
{
j = 0;
while(isspace(buf[i])) i++; /*remove leading white
space*/
if (i >= nread) break; /*disregard trailing
spaces*/
while(!isspace(buf[len])) len++; /*get length of token*/
argv[k]= (char *)sbrk(len + 1); /*allocate memory*/
memset(argv[k],(char)0,len + 1); /*clear new space*/
while (!isspace(buf[i])) /*take the next argument
from input stream*/
{
argv[k][j] = buf[i]; /*copy token from input*/
i++;j++;
}
argv[k][i] = '\0'; /*make token a null
terminated string*/
k++;
}
argv[k] = NULL;
}
