How to write and implement shell terminal code
This article focuses on "how to write shell terminal code", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to write and implement shell terminal code.
The code is as follows:
# include "apue.h"
Int userlogin (struct passwd * *)
Int main ()
{
Int ret,i=0
Long ret_cwd
Struct passwd * pw
Char buf [128], hostname [16], usercwd [128]
Char * ptmp1
Do {
Ret = userlogin (& pw)
} while (ret! = 1)
Getchar ()
While (1) {
/ / to gethostname
If (gethostname (buf,128)! = 0) {
Perror ("gethostname ()")
Return 0
}
/ / truncate hostname untill'.'
While (BUF [I]! ='.') {
Hostname [iTunes +] = buf [I]
}
I = 0
/ / if the user is' root' the symbol is'#'
/ / else'$'
/ / and the current work path is truncated from the last'/'to the end
Ret_cwd = (long) getcwd (usercwd,128)
If (strcmp (usercwd,pw- > pw_dir) = = 0) {
Ret = sprintf (usercwd, "~\ 0", NULL)
}
Else if (strcmp (usercwd, "/")! = 0) {
Ptmp1 = strrchr (usercwd,'/')
Sprintf (usercwd, "% s", ptmp1+1)
}
If (strcmp (pw- > pw_name, "root") = = 0) {
Sprintf (buf, "* [% slots% s% s] #"
Pw- > pw_name,hostname,usercwd)
}
Else {
Sprintf (buf, "* [% slots% s% s] $"
Pw- > pw_name,hostname,usercwd)
}
/ / command
Ssize_t g_ret,len
Char * line = NULL,*s_ret,*ptr=NULL
Int con_cd=0
Fprintf (stderr, "% s", buf)
G_ret = getline (& line,&len,stdin)
Line [strlen (line)-1] ='\ 0'
If (strcmp (line, "exit") = = 0) {
Exit (- 1)
}
Ptr = line
S_ret = line
System (line)
While (ptrackers null) {
S_ret = (char *) strsep (& ptr, "")
If (strcmp (s_ret, "cd") = = 0) {
Con_cd=1
Continue
}
Else if (con_cd = = 1) {
Chdir (s_ret)
}
}
}
Return 0
}
/ / login function
Int userlogin (struct passwd * * pw)
{
Char name [32], * passwd,*pret
Struct spwd * sp
Printf ("login:")
Fflush (stdout)
Scanf ("% s", name)
Passwd = getpass ("password:")
Sp = getspnam (name)
If (sp = = NULL) {
Fprintf (stdout, "no is user! [% s]\ n", name)
Return 0
}
Pret = crypt (passwd,sp- > sp_pwdp)
If (pret = = NULL) {
Fprintf (stdout, "crypt (% s)\ n", name)
Return 0
}
If (strcmp (pret,sp- > sp_pwdp) = = 0) {
Printf ("login successful!\ n")
}
Else {
Fprintf (stdout, "passwd is error!\ n")
Return 0
}
* pw = getpwnam (name)
If (* pw = = NULL) {
Printf ("getpwnam (% s) error\ n", name)
Return 0
}
Return 1
}
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