sh-setup: work around "unset IFS" bug in some shells
[git/git.git] / compat / terminal.c
1 #include "git-compat-util.h"
2 #include "compat/terminal.h"
3 #include "sigchain.h"
4 #include "strbuf.h"
5
6 #ifdef HAVE_DEV_TTY
7
8 static int term_fd = -1;
9 static struct termios old_term;
10
11 static void restore_term(void)
12 {
13 if (term_fd < 0)
14 return;
15
16 tcsetattr(term_fd, TCSAFLUSH, &old_term);
17 term_fd = -1;
18 }
19
20 static void restore_term_on_signal(int sig)
21 {
22 restore_term();
23 sigchain_pop(sig);
24 raise(sig);
25 }
26
27 char *git_terminal_prompt(const char *prompt, int echo)
28 {
29 static struct strbuf buf = STRBUF_INIT;
30 int r;
31 FILE *fh;
32
33 fh = fopen("/dev/tty", "w+");
34 if (!fh)
35 return NULL;
36
37 if (!echo) {
38 struct termios t;
39
40 if (tcgetattr(fileno(fh), &t) < 0) {
41 fclose(fh);
42 return NULL;
43 }
44
45 old_term = t;
46 term_fd = fileno(fh);
47 sigchain_push_common(restore_term_on_signal);
48
49 t.c_lflag &= ~ECHO;
50 if (tcsetattr(fileno(fh), TCSAFLUSH, &t) < 0) {
51 term_fd = -1;
52 fclose(fh);
53 return NULL;
54 }
55 }
56
57 fputs(prompt, fh);
58 fflush(fh);
59
60 r = strbuf_getline(&buf, fh, '\n');
61 if (!echo) {
62 fseek(fh, SEEK_CUR, 0);
63 putc('\n', fh);
64 fflush(fh);
65 }
66
67 restore_term();
68 fclose(fh);
69
70 if (r == EOF)
71 return NULL;
72 return buf.buf;
73 }
74
75 #else
76
77 char *git_terminal_prompt(const char *prompt, int echo)
78 {
79 return getpass(prompt);
80 }
81
82 #endif