inetd: fix bug 1562 "inetd does not set argv[0] properly" (fix by IlyaPanfilov)

inetd: code shrink while at it

function                                             old     new   delta
static.SOCK_xxx                                        -       6      +6
getconfigent                                        1222    1123     -99
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 6/-99)             Total: -93 bytes
   text    data     bss     dec     hex filename
 776099     974    9420  786493   c003d busybox_old
 776020     974    9420  786414   bffee busybox_unstripped

1 files changed, 14 insertions, 16 deletions

diff --git a/networking/inetd.c b/networking/inetd.c
index 8dca8fc3c..94d3df6e2 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -708,18 +708,17 @@ static servtab_t *getconfigent(void)
 	sep->se_service = xxstrdup(arg);
 	arg = skip(&cp);
 
-	if (strcmp(arg, "stream") == 0)
-		sep->se_socktype = SOCK_STREAM;
-	else if (strcmp(arg, "dgram") == 0)
-		sep->se_socktype = SOCK_DGRAM;
-	else if (strcmp(arg, "rdm") == 0)
-		sep->se_socktype = SOCK_RDM;
-	else if (strcmp(arg, "seqpacket") == 0)
-		sep->se_socktype = SOCK_SEQPACKET;
-	else if (strcmp(arg, "raw") == 0)
-		sep->se_socktype = SOCK_RAW;
-	else
-		sep->se_socktype = -1;
+	{
+		static int8_t SOCK_xxx[] ALIGN1 = {
+			-1,
+			SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
+			SOCK_SEQPACKET, SOCK_RAW
+		};
+		sep->se_socktype = SOCK_xxx[1 + index_in_strings(
+			"stream""\0" "dgram""\0" "rdm""\0"
+			"seqpacket""\0" "raw""\0"
+			, arg)];
+	}
 
 	sep->se_proto = xxstrdup(skip(&cp));
 
@@ -787,10 +786,9 @@ static servtab_t *getconfigent(void)
 		*arg++ = '\0';
 		sep->se_group = xstrdup(arg);
 	}
-	/* if ((arg = skip(&cp, 1)) == NULL) */
-	/* goto more; */
 
-	sep->se_server = xxstrdup(skip(&cp));
+	arg = skip(&cp);
+	sep->se_server = xxstrdup(arg);
 	if (strcmp(sep->se_server, "internal") == 0) {
 #ifdef INETD_FEATURE_ENABLED
 		const struct builtin *bi;
@@ -815,7 +813,7 @@ static servtab_t *getconfigent(void)
 		sep->se_bi = NULL;
 #endif
 	argc = 0;
-	for (arg = skip(&cp); cp; arg = skip(&cp)) {
+	for (; cp; arg = skip(&cp)) {
 		if (argc < MAXARGV)
 			sep->se_argv[argc++] = xxstrdup(arg);
 	}