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Make this work again for things like "sudo echo hi | more" where the tty

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gets put into character at a time mode.  We read until we read end of
line or we run out of space (similar to fgets(3)).
This commit is contained in:
Todd C. Miller
1999-11-01 04:00:57 +00:00
parent d0026e7d88
commit 3f1581ae66
1 changed files with 60 additions and 38 deletions
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98
tgetpass.c
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@@ -81,6 +81,7 @@
static const char rcsid[] = "$Sudo$";
#endif /* lint */
static char *tgetline __P((int, char *, size_t, int));
/*
* Like getpass(3) but with timeout and echo flags.
@@ -100,10 +101,8 @@ tgetpass(prompt, timeout, echo_off)
struct sgttyb ttyb;
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
int n, input, output;
int input, output;
static char buf[SUDO_PASS_MAX + 1];
fd_set *readfds;
struct timeval tv;
/* Open /dev/tty for reading/writing if possible else use stdin/stderr. */
if ((input = output = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) {
@@ -138,41 +137,8 @@ tgetpass(prompt, timeout, echo_off)
#endif /* HAVE_TERMIOS_H */
}
/*
* Timeout of <= 0 means no timeout.
*/
if (timeout > 0) {
/* setup for select(2) */
n = howmany(input + 1, NFDBITS) * sizeof(fd_mask);
readfds = (fd_set *) emalloc(n);
(void) memset((VOID *)readfds, 0, n);
FD_SET(input, readfds);
/* set timeout for select */
tv.tv_sec = timeout;
tv.tv_usec = 0;
/*
* Get password or return empty string if nothing to read by timeout
*/
buf[0] = '\0';
while ((n = select(input + 1, readfds, 0, 0, &tv)) == -1 &&
errno == EINTR)
;
if (n != 0 && (n = read(input, buf, sizeof(buf) - 1)) > 0) {
if (buf[n - 1] == '\n')
n--;
buf[n] = '\0';
}
free(readfds);
} else {
buf[0] = '\0';
if ((n = read(input, buf, sizeof(buf) - 1)) > 0) {
if (buf[n - 1] == '\n')
n--;
buf[n] = '\0';
}
}
buf[0] = '\0';
tgetline(input, buf, sizeof(buf), timeout);
#ifdef HAVE_TERMIOS_H
if (echo_off) {
@@ -201,3 +167,59 @@ tgetpass(prompt, timeout, echo_off)
return(buf);
}
/*
* Get a line of input (optionally timing out) and place it in buf.
*/
static char *
tgetline(fd, buf, bufsiz, timeout)
int fd;
char *buf;
size_t bufsiz;
int timeout;
{
size_t left;
int n;
fd_set *readfds = NULL;
struct timeval tv;
char *cp;
/*
* Timeout of <= 0 means no timeout.
*/
if (timeout > 0) {
/* Setup for select(2) */
n = howmany(fd + 1, NFDBITS) * sizeof(fd_mask);
readfds = (fd_set *) emalloc(n);
(void) memset((VOID *)readfds, 0, n);
FD_SET(fd, readfds);
/* Set timeout for select */
tv.tv_sec = timeout;
tv.tv_usec = 0;
/*
* Make sure there is something to read or timeout
*/
while ((n = select(fd + 1, readfds, 0, 0, &tv)) == -1 &&
errno == EINTR)
;
if (n == 0)
return(NULL); /* timeout */
}
if (readfds)
free(readfds);
/* Get a line of input */
left = bufsiz;
cp = buf;
do {
if ((n = read(fd, cp, left)) > 0) {
cp += n;
left -= n;
}
} while (n > 0 && left != 0 && *(cp - 1) != '\n');
*(cp - 1) = '\0';
return(left == bufsiz ? NULL : buf);
}