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select doesn't seem to recognize a single '\n' as input waiting

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so we can;t use it, sigh.
This commit is contained in:
Todd C. Miller
1994-06-28 22:25:08 +00:00
parent a541ff80b0
commit 391a73f40b
1 changed files with 77 additions and 18 deletions
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95
tgetpass.c
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@@ -52,6 +52,11 @@
#define _PASSWD_LEN 8
#endif /* _PASSWD_LEN */
/*
* Local Prototypes
*/
static int tgetc __P((FILE *, int));
/******************************************************************
*
@@ -76,7 +81,7 @@ char * tgetpass(prompt, timeout)
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
FILE * input, * output;
static char buf[_PASSWD_LEN + 1];
static char buf[_PASSWD_LEN + 2];
#ifdef POSIX_SIGNALS
sigset_t oldmask;
sigset_t mask;
@@ -138,35 +143,43 @@ char * tgetpass(prompt, timeout)
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
/* print the prompt & rewind */
(void) write(fileno(output), prompt, strlen(prompt));
/* rewind if necesary */
if (input == output) {
(void) fflush(output);
(void) rewind(output);
}
/* print the prompt */
(void) fputs(prompt, output);
/* rewind if necesary */
if (input == output) {
(void) fflush(output);
(void) rewind(output);
}
/* setup for select(2) */
FD_ZERO(&readfds);
/* get the password */
for (i=0; i < _PASSWD_LEN; i++) {
/* do select */
FD_SET(fileno(input), &readfds);
tv.tv_sec = timeout;
tv.tv_usec = 0;
#ifdef HAVE_SYSCONF
if (select(sysconf(_SC_OPEN_MAX), &readfds, NULL, NULL, &tv) <= 0) {
#else
if (select(getdtablesize(), &readfds, NULL, NULL, &tv) <= 0) {
#endif /* HAVE_SYSCONF */
for (i=0; i <= _PASSWD_LEN; i++) {
buf[i] = tgetc(input, timeout);
if (buf[i] == EOF) {
buf[0] = '\0';
break;
}
buf[i] = fgetc(input);
if (buf[i] == EOF || buf[i] == '\n') {
if (buf[i] == '\n') {
buf[i] = '\0';
break;
}
}
buf[_PASSWD_LEN - 1] = '\0';
(void) fputc('\n', output);
buf[_PASSWD_LEN] = '\0';
/* rewind if necesary and print a newline */
if (input == output) {
(void) fflush(output);
(void) rewind(output);
}
/* turn on echo */
#ifdef HAVE_TERMIOS_H
@@ -182,6 +195,17 @@ char * tgetpass(prompt, timeout)
#endif /* HAVE_TERMIO_H */
#endif /* HAVE_TERMIOS_H */
/* rewind if necesary */
if (input == output) {
(void) fflush(output);
(void) rewind(output);
}
#if 1
(void) write(fileno(output), "\n", 1);
#else
(void) fputc('\n', output);
#endif
/* restore old signal mask */
#ifdef POSIX_SIGNALS
(void) sigprocmask(SIG_SETMASK, &oldmask, NULL);
@@ -198,3 +222,38 @@ char * tgetpass(prompt, timeout)
else
return(NULL);
}
/******************************************************************
*
* tgetc()
*
* this function returns getc(input) unless the input times out
* (based on the value of timeout).
*/
static int tgetc(stream, timeout)
FILE * stream;
int timeout;
{
fd_set readfds;
struct timeval tv;
/* setup for select(2) */
FD_ZERO(&readfds);
FD_SET(fileno(stream), &readfds);
/* set timeout for select */
tv.tv_sec = timeout;
tv.tv_usec = 0;
/* return EOF if nothing to read by timeout */
#ifdef HAVE_SYSCONF
if (select(sysconf(_SC_OPEN_MAX), &readfds, NULL, NULL, &tv) <= 0)
#else
if (select(getdtablesize(), &readfds, NULL, NULL, &tv) <= 0)
#endif /* HAVE_SYSCONF */
return(EOF);
return(getc(stream));
}