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libbb: handle \S in /etc/issue

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-09-24 23:50:43 +02:00
parent d526b11897
commit 65ba7113e3
1 changed files with 40 additions and 0 deletions
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40
libbb/login.c
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@ -45,6 +45,45 @@ void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
if (c == '\\' || c == '%') {
c = fgetc(fp);
switch (c) {
//From getty manpage (* - supported by us)
//========================================
//4 or 4{interface}
// Insert the IPv4 address of the network interface (example: \4{eth0}).
// If the interface argument is not specified, then select the first
// fully configured (UP, non-LOOPBACK, RUNNING) interface.
//6 or 6{interface} -- The same as \4 but for IPv6.
//b -- Insert the baudrate of the current line.
//*d -- Insert the current date.
//*t -- Insert the current time.
//e or e{name}
// Translate the human-readable name to an escape sequence and insert it
// (for example: \e{red}Alert text.\e{reset}). If the name argument
// is not specified, then insert \033. The currently supported names are:
// black, blink, blue, bold, brown, cyan, darkgray, gray, green, halfbright,
// lightblue, lightcyan, lightgray, lightgreen, lightmagenta, lightred,
// magenta, red, reset, reverse, and yellow. Unknown names are ignored.
//*s
// Insert the system name (the name of the operating system - `uname -s`)
//*S or S{VARIABLE}
// Insert the VARIABLE data from /etc/os-release.
// If the VARIABLE argument is not specified, use PRETTY_NAME.
// If PRETTY_NAME is not in /etc/os-release, \S is the same as \s.
//*l -- Insert the name of the current tty line.
//*m -- Insert the architecture identifier of the machine: `uname -m`.
//*n -- Insert the nodename of the machine: `uname -n`.
//*o -- Insert the NIS domainname of the machine. Same as `hostname -d'.
//*O -- Insert the DNS domainname of the machine.
//*r -- Insert the release number of the OS: `uname -r`.
//u -- Insert the number of current users logged in.
//U -- Insert the string "1 user" or "N users" (current users logged in).
//*v -- Insert the version of the OS, e.g. the build-date etc: `uname -v`.
//We also implement:
//*D -- same as \O "DNS domainname"
//*h -- same as \n "nodename"
case 'S':
/* minimal implementation, not reading /etc/os-release */
/*FALLTHROUGH*/
case 's':
outbuf = uts.sysname;
break;
@ -65,6 +104,7 @@ void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
#if defined(__linux__)
case 'D':
case 'o':
case 'O':
outbuf = uts.domainname;
break;
#endif