erts: Add {line_delimiter, byte()} option to inet:setopts/2

A new {line_delimiter, byte()} option allows line-oriented TCP-based
protocols to use a custom line delimiting character. It is to be
used in conjunction with {packet, line}.

This option also works with erlang:decode_packet/3 when its first argument
is 'line'.

8 files changed, 31 insertions, 6 deletions

diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 0492924164..1963b27915 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -933,6 +933,10 @@
                 if <c>packet_size</c> itself is not set. This use is
                 only intended for backward compatibility.</p>
               </item>
+              <tag><c>{line_delimiter, 0 &le; char() &le; 255}</c></tag>
+              <item><p>For packet type <c>line</c>, sets delimiting character.
+                Default <c>$\n</c>.</p>
+              </item>
             </taglist>
         <p>Examples:</p>
         <pre>
diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index f9a2f3e33e..190e7817dc 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -321,6 +321,7 @@ atom ldflags
 atom Le='=<'
 atom lf
 atom line
+atom line_delimiter
 atom line_length
 atom linked_in_driver
 atom links
diff --git a/erts/emulator/beam/erl_bif_port.c b/erts/emulator/beam/erl_bif_port.c
index 3ff54c7a60..e47d7bcbbb 100644
--- a/erts/emulator/beam/erl_bif_port.c
+++ b/erts/emulator/beam/erl_bif_port.c
@@ -1329,7 +1329,8 @@ BIF_RETTYPE decode_packet_3(BIF_ALIST_3)
     ErlSubBin* rest;
     Eterm res;
     Eterm options;
-    int code;
+    int   code;
+    char  delimiter = '\n';
 
     if (!is_binary(BIF_ARG_2) || 
         (!is_list(BIF_ARG_3) && !is_nil(BIF_ARG_3))) {
@@ -1370,6 +1371,11 @@ BIF_RETTYPE decode_packet_3(BIF_ALIST_3)
                 case am_line_length:
                     trunc_len = val;
                     goto next_option;
+                case am_line_delimiter:
+                    if (type == TCP_PB_LINE_LF && val >= 0 && val <= 255) {
+                        delimiter = (char)val;
+                        goto next_option;
+                    }
                 }
             }
         }
@@ -1390,7 +1396,7 @@ BIF_RETTYPE decode_packet_3(BIF_ALIST_3)
         pca.aligned_ptr = bin_ptr;
     }
     packet_sz = packet_get_length(type, (char*)pca.aligned_ptr, pca.bin_sz,
-                                  max_plen, trunc_len, &http_state);
+                                  max_plen, trunc_len, delimiter, &http_state);
     if (!(packet_sz > 0 && packet_sz <= pca.bin_sz)) {
         if (packet_sz < 0) {
 	    goto error;
diff --git a/erts/emulator/beam/packet_parser.c b/erts/emulator/beam/packet_parser.c
index 2dd421a9e9..a737a86f14 100644
--- a/erts/emulator/beam/packet_parser.c
+++ b/erts/emulator/beam/packet_parser.c
@@ -256,6 +256,7 @@ int packet_get_length(enum PacketParseType htype,
                       const char* ptr, unsigned n, /* Bytes read so far */
                       unsigned max_plen,     /* Max packet length, 0=no limit */
                       unsigned trunc_len,    /* Truncate (lines) if longer, 0=no limit */
+                      char     delimiter,    /* Line delimiting character */
                       int*     statep)       /* Protocol specific state */
 {
     unsigned hlen, plen;
@@ -299,9 +300,9 @@ int packet_get_length(enum PacketParseType htype,
         goto remain;
 
     case TCP_PB_LINE_LF: {
-        /* TCP_PB_LINE_LF:  [Data ... \n]  */
+        /* TCP_PB_LINE_LF:  [Data ... Delimiter]  */
         const char* ptr2;
-        if ((ptr2 = memchr(ptr, '\n', n)) == NULL) {
+        if ((ptr2 = memchr(ptr, delimiter, n)) == NULL) {
             if (n > max_plen && max_plen != 0) { /* packet full */
                 DEBUGF((" => packet full (no NL)=%d\r\n", n));
                 goto error;
diff --git a/erts/emulator/beam/packet_parser.h b/erts/emulator/beam/packet_parser.h
index ff158ff8b8..717d905fad 100644
--- a/erts/emulator/beam/packet_parser.h
+++ b/erts/emulator/beam/packet_parser.h
@@ -105,7 +105,8 @@ int packet_get_length(enum PacketParseType htype,
 		      const char* ptr, unsigned n,  /* Bytes read so far */
 		      unsigned max_plen,      /* Packet max length, 0=no limit */
 		      unsigned trunc_len,     /* Truncate (lines) if longer, 0=no limit */
-		      int* statep);           /* Internal protocol state */
+		      char     delimiter,     /* Line delimiting character */
+		      int*     statep);       /* Internal protocol state */
 
 ERTS_GLB_INLINE
 void packet_get_body(enum PacketParseType htype,
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 89b71aa66a..a829599fe5 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -885,6 +885,7 @@ static int my_strncasecmp(const char *s1, const char *s2, size_t n)
 #define INET_LOPT_MSGQ_LOWTRMRK     37  /* set local msgq low watermark */
 #define INET_LOPT_NETNS             38  /* Network namespace pathname */
 #define INET_LOPT_TCP_SHOW_ECONNRESET 39  /* tell user about incoming RST */
+#define INET_LOPT_LINE_DELIM        40  /* Line delimiting char */
 /* SCTP options: a separate range, from 100: */
 #define SCTP_OPT_RTOINFO		100
 #define SCTP_OPT_ASSOCINFO		101
@@ -1154,6 +1155,7 @@ typedef struct {
 #else
     Uint32        send_oct[2];  /* number of octets sent, 64 bits */
 #endif
+    char          delimiter;    /* Line delimiting character (def: '\n')  */
     unsigned long send_cnt;     /* number of packets sent */
     unsigned long send_max;     /* maximum packet send */
     double send_avg;            /* average packet size sent */
@@ -6276,6 +6278,12 @@ static int inet_set_opts(inet_descriptor* desc, char* ptr, int len)
 	    }
 	    continue;
 
+	case INET_LOPT_LINE_DELIM:
+	    DEBUGF(("inet_set_opts(%ld): s=%d, LINE_DELIM=%d\r\n",
+		    (long)desc->port, desc->s, ival));
+	    desc->delimiter = (char)ival;
+	    continue;
+
 	case INET_OPT_REUSEADDR: 
 #ifdef __WIN32__
 	    continue;  /* Bjorn says */
@@ -8371,6 +8379,7 @@ static ErlDrvData inet_start(ErlDrvPort port, int size, int protocol)
     desc->deliver = INET_DELIVER_TERM; /* standard term format */
     desc->active  = INET_PASSIVE;      /* start passive */
     desc->active_count = 0;
+    desc->delimiter    = '\n';         /* line delimiting char */
     desc->oph = NULL;
     desc->opt = NULL;
 
@@ -9882,7 +9891,7 @@ static int tcp_remain(tcp_descriptor* desc, int* len)
 
     tlen = packet_get_length(desc->inet.htype, ptr, n, 
                              desc->inet.psize, desc->i_bufsz,
-                             &desc->http_state);
+                             desc->inet.delimiter, &desc->http_state);
 
     DEBUGF(("tcp_remain(%ld): s=%d, n=%d, nfill=%d nsz=%d, tlen %d\r\n",
 	    (long)desc->inet.port, desc->inet.s, n, nfill, nsz, tlen));
diff --git a/erts/preloaded/ebin/prim_inet.beam b/erts/preloaded/ebin/prim_inet.beam
index 5a188be3ba..8b87d1ae26 100644
--- a/erts/preloaded/ebin/prim_inet.beam
+++ b/erts/preloaded/ebin/prim_inet.beam
diff --git a/erts/preloaded/src/prim_inet.erl b/erts/preloaded/src/prim_inet.erl
index 4d04e1dacb..d5c8fd4268 100644
--- a/erts/preloaded/src/prim_inet.erl
+++ b/erts/preloaded/src/prim_inet.erl
@@ -1147,6 +1147,7 @@ enc_opt(packet_size)     -> ?INET_LOPT_PACKET_SIZE;
 enc_opt(read_packets)    -> ?INET_LOPT_READ_PACKETS;
 enc_opt(netns)           -> ?INET_LOPT_NETNS;
 enc_opt(show_econnreset) -> ?INET_LOPT_TCP_SHOW_ECONNRESET;
+enc_opt(line_delimiter)  -> ?INET_LOPT_LINE_DELIM;
 enc_opt(raw)             -> ?INET_OPT_RAW;
 % Names of SCTP opts:
 enc_opt(sctp_rtoinfo)	 	   -> ?SCTP_OPT_RTOINFO;
@@ -1205,6 +1206,7 @@ dec_opt(?INET_LOPT_PACKET_SIZE)      -> packet_size;
 dec_opt(?INET_LOPT_READ_PACKETS)     -> read_packets;
 dec_opt(?INET_LOPT_NETNS)           -> netns;
 dec_opt(?INET_LOPT_TCP_SHOW_ECONNRESET) -> show_econnreset;
+dec_opt(?INET_LOPT_LINE_DELIM)      -> line_delimiter;
 dec_opt(?INET_OPT_RAW)              -> raw;
 dec_opt(I) when is_integer(I)     -> undefined.
 
@@ -1287,6 +1289,7 @@ type_opt_1(packet) ->
 	   {httph_bin,?TCP_PB_HTTPH_BIN},
 	   {ssl, ?TCP_PB_SSL_TLS}, % obsolete
 	   {ssl_tls, ?TCP_PB_SSL_TLS}]};
+type_opt_1(line_delimiter)  -> int;
 type_opt_1(mode) ->
     {enum,[{list, ?INET_MODE_LIST},
 	   {binary, ?INET_MODE_BINARY}]};