Some minor refactoring in asn1.c

diff --git a/src/libstrongswan/asn1/asn1.c b/src/libstrongswan/asn1/asn1.c
index bbde452..b0d7094 100644 (file)
--- a/src/libstrongswan/asn1/asn1.c
+++ b/src/libstrongswan/asn1/asn1.c
@@ -88,7 +88,7 @@ int asn1_known_oid(chunk_t object)
                        }
                }
        }
-       return -1;
+       return OID_UNKNOWN;
 }
 
 /*
@@ -129,7 +129,8 @@ chunk_t asn1_build_known_oid(int n)
 chunk_t asn1_oid_from_string(char *str)
 {
        enumerator_t *enumerator;
-       u_char buf[64];
+       size_t buf_len = 64;
+       u_char buf[buf_len];
        char *end;
        int i = 0, pos = 0, shift;
        u_int val, shifted_val, first = 0;
@@ -138,7 +139,7 @@ chunk_t asn1_oid_from_string(char *str)
        while (enumerator->enumerate(enumerator, &str))
        {
                val = strtoul(str, &end, 10);
-               if (end == str || pos > countof(buf))
+               if (end == str || pos > buf_len-4)
                {
                        pos = 0;
                        break;
@@ -175,8 +176,9 @@ chunk_t asn1_oid_from_string(char *str)
  */
 char *asn1_oid_to_string(chunk_t oid)
 {
-       char buf[64], *pos = buf;
-       int len;
+       size_t len = 64;
+       char buf[len], *pos = buf;
+       int written;
        u_int val;
 
        if (!oid.len)
@@ -184,13 +186,14 @@ char *asn1_oid_to_string(chunk_t oid)
                return NULL;
        }
        val = oid.ptr[0] / 40;
-       len = snprintf(buf, sizeof(buf), "%u.%u", val, oid.ptr[0] - val * 40);
+       written = snprintf(buf, len, "%u.%u", val, oid.ptr[0] - val * 40);
        oid = chunk_skip(oid, 1);
-       if (len < 0 || len >= sizeof(buf))
+       if (written < 0 || written >= len)
        {
                return NULL;
        }
-       pos += len;
+       pos += written;
+       len -= written;
        val = 0;
 
        while (oid.len)
@@ -199,12 +202,13 @@ char *asn1_oid_to_string(chunk_t oid)
 
                if (oid.ptr[0] < 128)
                {
-                       len = snprintf(pos, sizeof(buf) + buf - pos, ".%u", val);
-                       if (len < 0 || len >= sizeof(buf) + buf - pos)
+                       written = snprintf(pos, len, ".%u", val);
+                       if (written < 0 || written >= len)
                        {
                                return NULL;
                        }
-                       pos += len;
+                       pos += written;
+                       len -= written;
                        val = 0;
                }
                oid = chunk_skip(oid, 1);
@@ -675,7 +679,9 @@ bool asn1_is_printablestring(chunk_t str)
        for (i = 0; i < str.len; i++)
        {
                if (strchr(printablestring_charset, str.ptr[i]) == NULL)
+               {
                        return FALSE;
+               }
        }
        return TRUE;
 }