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getty: comment out parity detection code; improve usage text

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function                                             old     new   delta
packed_usage                                       28155   28191     +36
static.erase                                          12       -     -12
getty_main                                          1847    1621    -226
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/1 up/down: 36/-238)          Total: -202 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-01-22 03:06:40 +01:00
parent 3a0f690dcd
commit 2b57b6cd43
1 changed files with 72 additions and 40 deletions
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112
loginutils/getty.c
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@ -58,9 +58,16 @@ static FILE *dbf;
* and for line editing at the same time.
*/
/* I doubt there are systems which still need this */
/* I doubt there are systems which still... */
/* ...have only uppercase: */
#undef HANDLE_ALLCAPS
/* ...use # and @ for backspace and line erase: */
#undef ANCIENT_BS_KILL_CHARS
/* It actually makes sense (tries to guess parity by looking at 7th bit)
* but it's broken, and interferes with non-ASCII login names
* (yes, I did receive complains from real users):
*/
#undef BROKEN_PARITY_DETECTION_CODE
#undef _PATH_LOGIN
#define _PATH_LOGIN "/bin/login"
@ -108,8 +115,11 @@ struct options {
/* Storage for things detected while the login name was read. */
struct chardata {
unsigned char erase; /* erase character */
#ifdef ANCIENT_BS_KILL_CHARS
unsigned char kill; /* kill character */
#endif
unsigned char eol; /* end-of-line character */
#ifdef BROKEN_PARITY_DETECTION_CODE
unsigned char parity; /* what parity did we see */
/* (parity & 1): saw odd parity char with 7th bit set */
/* (parity & 2): saw even parity char with 7th bit set */
@ -117,7 +127,8 @@ struct chardata {
/* parity == 1: probably 7-bit, odd parity? */
/* parity == 2: probably 7-bit, even parity? */
/* parity == 3: definitely 8 bit, no parity! */
/* Hmm... with any value of "parity" 8 bit, no parity is possible */
/* Hmm... with any value of parity "8 bit, no parity" is possible */
#endif
#ifdef HANDLE_ALLCAPS
unsigned char capslock; /* upper case without lower case */
#endif
@ -126,9 +137,13 @@ struct chardata {
/* Initial values for the above. */
static const struct chardata init_chardata = {
DEF_ERASE, /* default erase character */
#ifdef ANCIENT_BS_KILL_CHARS
DEF_KILL, /* default kill character */
#endif
13, /* default eol char */
#ifdef BROKEN_PARITY_DETECTION_CODE
0, /* space parity */
#endif
#ifdef HANDLE_ALLCAPS
0, /* no capslock */
#endif
@ -137,21 +152,23 @@ static const struct chardata init_chardata = {
#define line_buf bb_common_bufsiz1
//usage:#define getty_trivial_usage
//usage: "[OPTIONS] BAUD_RATE TTY [TERMTYPE]"
//usage: "[OPTIONS] BAUD_RATE[,BAUD_RATE]... TTY [TERMTYPE]"
//usage:#define getty_full_usage "\n\n"
//usage: "Open a tty, prompt for a login name, then invoke /bin/login\n"
//usage: "\nOptions:"
//usage: "\n -h Enable hardware (RTS/CTS) flow control"
//usage: "\n -i Don't display /etc/issue"
//usage: "\n -L Local line, don't do carrier detect"
//usage: "\n -L Local line, set CLOCAL on it"
//usage: "\n -m Get baud rate from modem's CONNECT status message"
//usage: "\n -w Wait for a CR or LF before sending /etc/issue"
//usage: "\n -n Don't prompt the user for a login name"
//usage: "\n -w Wait for CR or LF before sending /etc/issue"
//usage: "\n -n Don't prompt for a login name"
//usage: "\n -f ISSUE_FILE Display ISSUE_FILE instead of /etc/issue"
//usage: "\n -l LOGIN Invoke LOGIN instead of /bin/login"
//usage: "\n -t SEC Terminate after SEC if no username is read"
//usage: "\n -I INITSTR Send INITSTR before anything else"
//usage: "\n -H HOST Log HOST into the utmp file as the hostname"
//usage: "\n"
//usage: "\nBAUD_RATE of 0 leaves it unchanged"
static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
#define F_INITSTRING (1 << 0) /* -I */
@ -259,29 +276,27 @@ static void open_tty(const char *tty)
/* termios_init - initialize termios settings */
static void termios_init(struct termios *tp, int speed)
{
speed_t ispeed, ospeed;
/* Flush input and output queues, important for modems! */
/* TODO: sleep(1)? Users report lost chars, and I hesitate
* to use tcdrain here instead of tcflush */
tcflush(0, TCIOFLUSH);
/* Set speed if it wasn't specified as "0" on command line. */
if (speed != B0) {
cfsetispeed(tp, speed);
cfsetospeed(tp, speed);
}
/*
* Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
* Special characters are set after we have read the login name; all
* reads will be done in raw mode anyway. Errors will be dealt with
* later on.
*/
/* flush input and output queues, important for modems! */
tcflush(0, TCIOFLUSH);
ispeed = ospeed = speed;
if (speed == B0) {
/* Speed was specified as "0" on command line.
* Just leave it unchanged */
ispeed = cfgetispeed(tp);
ospeed = cfgetospeed(tp);
}
tp->c_cflag = CS8 | HUPCL | CREAD;
if (option_mask32 & F_LOCAL)
tp->c_cflag |= CLOCAL;
cfsetispeed(tp, ispeed);
cfsetospeed(tp, ospeed);
tp->c_iflag = tp->c_lflag = 0;
tp->c_iflag = 0;
tp->c_lflag = 0;
tp->c_oflag = OPOST | ONLCR;
tp->c_cc[VMIN] = 1;
tp->c_cc[VTIME] = 0;
@ -388,14 +403,14 @@ static char *get_logname(char *logname, unsigned size_logname,
char *bp;
char c; /* input character, full eight bits */
char ascval; /* low 7 bits of input character */
int bits; /* # of "1" bits per character */
int mask; /* mask with 1 bit up */
#ifdef BROKEN_PARITY_DETECTION_CODE
static const char erase[][3] = {/* backspace-space-backspace */
"\010\040\010", /* space parity */
"\010\040\010", /* odd parity */
"\210\240\210", /* even parity */
"\010\040\010", /* 8 bit no parity */
};
#endif
/* NB: *cp is pre-initialized with init_chardata */
@ -406,14 +421,13 @@ static char *get_logname(char *logname, unsigned size_logname,
/* Prompt for and read a login name. */
logname[0] = '\0';
while (!logname[0]) {
/* Write issue file and prompt, with "parity" bit == 0. */
/* Write issue file and prompt. */
do_prompt(op);
/* Read name, watch for break, parity, erase, kill, end-of-line. */
bp = logname;
cp->eol = '\0';
while (cp->eol == '\0') {
while (1) {
/* Do not report trivial EINTR/EIO errors. */
errno = EINTR; /* make read of 0 bytes be silent too */
if (read(STDIN_FILENO, &c, 1) < 1) {
@ -427,10 +441,11 @@ static char *get_logname(char *logname, unsigned size_logname,
if (c == '\0' && op->numspeed > 1)
return NULL;
#ifdef BROKEN_PARITY_DETECTION_CODE
/* Do parity bit handling. */
if (!(option_mask32 & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
bits = 1;
mask = 1;
if (!(option_mask32 & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
int bits = 1;
int mask = 1;
while (mask & 0x7f) {
if (mask & c)
bits++; /* count "1" bits */
@ -439,15 +454,18 @@ static char *get_logname(char *logname, unsigned size_logname,
/* ... |= 2 - even, 1 - odd */
cp->parity |= 2 - (bits & 1);
}
ascval = c & 0x7f;
#else
ascval = c;
#endif
/* Do erase, kill and end-of-line processing. */
ascval = c & 0x7f;
switch (ascval) {
case CR:
case NL:
*bp = '\0'; /* terminate logname */
cp->eol = ascval; /* set end-of-line char */
break;
goto got_logname;
case BS:
case DEL:
#ifdef ANCIENT_BS_KILL_CHARS
@ -455,17 +473,25 @@ static char *get_logname(char *logname, unsigned size_logname,
#endif
cp->erase = ascval; /* set erase character */
if (bp > logname) {
#ifdef BROKEN_PARITY_DETECTION_CODE
full_write(STDOUT_FILENO, erase[cp->parity], 3);
#else
full_write(STDOUT_FILENO, "\010 \010", 3);
#endif
bp--;
}
break;
case CTL('U'):
#ifdef ANCIENT_BS_KILL_CHARS
case '@':
#endif
cp->kill = ascval; /* set kill character */
#endif
while (bp > logname) {
#ifdef BROKEN_PARITY_DETECTION_CODE
full_write(STDOUT_FILENO, erase[cp->parity], 3);
#else
full_write(STDOUT_FILENO, "\010 \010", 3);
#endif
bp--;
}
break;
@ -474,19 +500,18 @@ static char *get_logname(char *logname, unsigned size_logname,
default:
if (ascval < ' ') {
/* ignore garbage characters */
} else if ((int)(bp - logname) >= size_logname - 1) {
bb_error_msg_and_die("input overrun");
} else {
} else if ((int)(bp - logname) < size_logname - 1) {
full_write(STDOUT_FILENO, &c, 1); /* echo the character */
*bp++ = ascval; /* and store it */
}
break;
}
}
}
/* Handle names with upper case and no lower case. */
} /* end of get char loop */
got_logname: ;
} /* while logname is empty */
#ifdef HANDLE_ALLCAPS
/* Handle names with upper case and no lower case. */
cp->capslock = all_is_upcase(logname);
if (cp->capslock) {
for (bp = logname; *bp; bp++)
@ -520,8 +545,13 @@ static void termios_final(struct termios *tp, struct chardata *cp)
tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
}
tp->c_cc[VERASE] = cp->erase; /* set erase character */
#ifdef ANCIENT_BS_KILL_CHARS
tp->c_cc[VKILL] = cp->kill; /* set kill character */
#else
tp->c_cc[VKILL] = DEF_KILL; /* set kill character */
#endif
#ifdef BROKEN_PARITY_DETECTION_CODE
/* Account for the presence or absence of parity bits in input. */
switch (cp->parity) {
case 0: /* space (always 0) parity */
@ -542,17 +572,19 @@ static void termios_final(struct termios *tp, struct chardata *cp)
// Entire parity detection madness here just begs for deletion...
break;
}
#endif
/* Account for upper case without lower case. */
#ifdef HANDLE_ALLCAPS
/* Account for upper case without lower case. */
if (cp->capslock) {
tp->c_iflag |= IUCLC;
tp->c_lflag |= XCASE;
tp->c_oflag |= OLCUC;
}
#endif
/* Optionally enable hardware flow control */
#ifdef CRTSCTS
/* Optionally enable hardware flow control */
if (option_mask32 & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
@ -685,7 +717,7 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
logname = NULL;
if (!(option_mask32 & F_NOPROMPT)) {
/* NB:termios_init already set line speed
/* NB: termios_init already set line speed
* to options.speeds[0] */
int baud_index = 0;