chat: new applet by dronnikov AT gmail.com. With all options on:

function                                             old     new   delta
chat_main                                              -    1230   +1230
unescape                                               -     135    +135
packed_usage                                       23802   23922    +120
signal_handler                                       123     131      +8
input_backward                                       123     128      +5
applet_names                                        1775    1780      +5
applet_main                                         1076    1080      +4
applet_nameofs                                       538     540      +2
exitcode                                               -       1      +1
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 6/0 up/down: 1510/0)           Total: 1510 bytes

2 files changed, 61 insertions, 0 deletions

diff --git a/miscutils/Config.in b/miscutils/Config.in
index d64d05345..9df1b0e85 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -19,6 +19,66 @@ config BBCONFIG
           The bbconfig applet will print the config file with which
           busybox was built.
 
+config CHAT
+        bool "chat"
+        default n
+        help
+          Simple chat utility.
+
+config FEATURE_CHAT_NOFAIL
+        bool "Enable NOFAIL expect strings"
+        default y
+        help
+          When enabled expect strings which are started with a dash trigger
+          no-fail mode. That is when expectation is not met within timeout
+          the script is not terminated but sends next SEND string and waits
+          for next EXPECT string. This allows to compose far more flexible
+          scripts.
+
+config FEATURE_CHAT_TTY_HIFI
+        bool "Force STDIN to be a TTY"
+        default n
+        help
+          Original chat always treats STDIN as a TTY device and sets for it
+          so-called raw mode. This option turns on such behaviour.
+
+config FEATURE_CHAT_IMPLICIT_CR
+        bool "Enable implicit Carriage Return"
+        default y
+        help
+          When enabled make chat to terminate all SEND strings with a "\r"
+          unless "\c" is met anywhere in the string.
+
+config FEATURE_CHAT_SWALLOW_OPTS
+        bool "Swallow options"
+        default n
+        help
+          Busybox chat require no options. To make it not fail when used
+          in place of original chat (which has a bunch of options) turn
+          this on.
+
+config FEATURE_CHAT_SEND_ESCAPES
+        bool "Support weird SEND escapes"
+        default n
+        help
+          Original chat uses some escape sequences in SEND arguments which
+          are not sent to device but rather performs special actions.
+          E.g. "\K" means to send a break sequence to device.
+          "\d" delays execution for a second, "\p" -- for a 1/100 of second.
+          Before turning this option on think twice: do you really need them?
+
+config FEATURE_CHAT_VAR_ABORT_LEN
+        bool "Support variable-length ABORT conditions"
+        default n
+        help
+          Original chat uses fixed 50-bytes length ABORT conditions. Say N here.
+
+config FEATURE_CHAT_CLR_ABORT
+        bool "Support revoking of ABORT conditions"
+        default n
+        help
+          Support CLR_ABORT directive.
+
 config CHRT
         bool "chrt"
         default n
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index a9dc833e6..51187c556 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -7,6 +7,7 @@
 lib-y:=
 lib-$(CONFIG_ADJTIMEX)    += adjtimex.o
 lib-$(CONFIG_BBCONFIG)    += bbconfig.o
+lib-$(CONFIG_CHAT)        += chat.o
 lib-$(CONFIG_CHRT)        += chrt.o
 lib-$(CONFIG_CROND)       += crond.o
 lib-$(CONFIG_CRONTAB)     += crontab.o