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);
         }