Initial Contribution

libc/netbsd/net/getservent.c

@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <netdb.h>
+#include "servent.h"
+#include "services.h"
+
+void
+setservent(int f)
+{
+    res_static  rs = __res_get_static();
+    if (rs) {
+        rs->servent_ptr = NULL;
+    }
+}
+
+void
+endservent(void)
+{
+    /* nothing to do */
+}
+
+struct servent *
+getservent_r( res_static  rs )
+{
+    const char*  p;
+    const char*  q;
+    int          namelen;
+    int          nn,count;
+    int          total = 0;
+    char*        p2;
+
+    p = rs->servent_ptr;
+    if (p == NULL)
+        p = _services;
+    else if (p[0] == 0)
+        return NULL;
+
+    /* first compute the total size */
+    namelen = p[0];
+    total  += namelen + 1;
+    q       = p + 1 + namelen + 3;  /* skip name + port + proto */
+    count   = q[0];   /* get aliascount */
+    q      += 1;
+
+    total += (count+1)*sizeof(char*);
+    for (nn = 0; nn < count; nn++) {
+        int  len2 = q[0];
+        total += 1 + len2;
+        q     += 1 + len2;
+    }
+
+    /* reallocate the thread-specific servent struct */
+    p2 = realloc( (char*)rs->servent.s_aliases, total );
+    if (p2 == NULL)
+        return NULL;
+
+    /* now write to it */
+    rs->servent.s_aliases = (char**) p2;
+    p2                   += (count+1)*sizeof(char*);
+    rs->servent.s_name    = p2;
+    p2                   += namelen + 1;
+    rs->servent.s_proto   = p2;
+
+    /* copy name + port + setup protocol */
+    memcpy( rs->servent.s_name, p+1, namelen );
+    rs->servent.s_name[namelen] = 0;
+    p += 1 + namelen;
+    rs->servent.s_port = ((((unsigned char*)p)[0] << 8) |
+                           ((unsigned char*)p)[1]);
+
+    rs->servent.s_proto = p[2] == 't' ? "tcp" : "udp";
+    p += 4;  /* skip port(2) + proto(1) + aliascount(1) */
+
+    for (nn = 0; nn < count; nn++) {
+        int  len2 = p[0];
+        rs->servent.s_aliases[nn] = p2;
+        memcpy( p2, p+1, len2 );
+        p2[len2] = 0;
+        p2 += len2 + 1;
+        p  += len2 + 1;
+    }
+    rs->servent.s_aliases[nn] = NULL;
+
+    rs->servent_ptr = p;
+
+    return &rs->servent;
+}
+
+struct servent *
+getservent(void)
+{
+    res_static   rs = __res_get_static();
+
+    if (rs == NULL) return NULL;
+
+    return getservent_r(rs);
+}