Propagate nil in Lua APIs more often

test/tool/net/lfuncs_test.lua

@@ -47,9 +47,13 @@ assert(hex(0x1940efe9d47ae889) == "0x1940efe9d47ae889")
 assert(oct(0x1940efe9d47ae889) == "0145007376472436564211")
 assert(bin(0x1940efe9d47ae889) == "0b0001100101000000111011111110100111010100011110101110100010001001")
 
+assert(EscapeHtml(nil) == nil)
 assert(EscapeHtml("?hello&there<>") == "?hello&amp;there&lt;&gt;")
+
+assert(EscapeParam(nil) == nil)
 assert(EscapeParam("?hello&there<>") == "%3Fhello%26there%3C%3E")
 
+assert(DecodeLatin1(nil) == nil)
 assert(DecodeLatin1("hello\xff\xc0") == "helloÿÀ")
 assert(EncodeLatin1("helloÿÀ") == "hello\xff\xc0")
 
@@ -65,6 +69,7 @@ assert(url.fragment == "frag")
 
 assert(Decimate("\xff\xff\x00\x00\xff\xff\x00\x00\xff\xff\x00\x00") == "\xff\x00\xff\x00\xff\x00")
 
+assert(Underlong(nil) == nil)
 assert(Underlong("hello") == "hello")
 assert(Underlong("hello\xc0\x80") == "hello\x00")
 
@@ -91,6 +96,7 @@ assert(not IsLoopbackIp(0x08080808))
 assert(not IsLoopbackIp(0x0a000000))
 assert(IsLoopbackIp(0x7f000001))
 
+assert(IndentLines(nil) == nil)
 assert(IndentLines("hi\nthere") == " hi\n there")
 assert(IndentLines("hi\nthere\n") == " hi\n there\n")
 assert(IndentLines("hi\nthere\n", 2) == "  hi\n  there\n")

test/tool/net/md5_test.lua

@@ -15,6 +15,8 @@
 
 unix.pledge('stdio')
 
+assert(Md5(nil) == nil)
+
 -- https://datatracker.ietf.org/doc/html/rfc1321#appendix-A.5
 assert(Md5("hello") == "\x5d\x41\x40\x2a\xbc\x4b\x2a\x76\xb9\x71\x9d\x91\x10\x17\xc5\x92")
 assert(Md5("") == "\xd4\x1d\x8c\xd9\x8f\x00\xb2\x04\xe9\x80\x09\x98\xec\xf8\x42\x7e")

test/tool/net/sha_test.lua

@@ -22,6 +22,7 @@
 unix.pledge('stdio')
 
 -- SHA-1
+assert(Sha1(nil) == nil)
 assert(Sha1("abc") == "\xa9\x99\x3e\x36\x47\x06\x81\x6a\xba\x3e\x25\x71\x78\x50\xc2\x6c\x9c\xd0\xd8\x9d")
 assert(
     Sha1("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") ==
@@ -57,6 +58,7 @@ assert(
 )
 
 -- SHA-224
+assert(Sha224(nil) == nil)
 assert(
     Sha224("abc") ==
     "\x23\x09\x7d\x22\x34\x05\xd8\x22\x86\x42\xa4\x77\xbd\xa2" ..
@@ -106,6 +108,7 @@ assert(
 )
 
 -- SHA-256
+assert(Sha256(nil) == nil)
 assert(
     Sha256("abc") ==
     "\xba\x78\x16\xbf\x8f\x01\xcf\xea\x41\x41\x40\xde\x5d\xae\x22\x23" ..
@@ -150,6 +153,7 @@ assert(
 )
 
 -- SHA-384
+assert(Sha384(nil) == nil)
 assert(
     Sha384("abc") ==
     "\xcb\x00\x75\x3f\x45\xa3\x5e\x8b\xb5\xa0\x3d\x69\x9a\xc6\x50\x07\x27\x2c\x32\xab\x0e\xde\xd1\x63" ..
@@ -203,6 +207,7 @@ assert(
 )
 
 -- SHA-512
+assert(Sha512(nil) == nil)
 assert(
     Sha512("abc") ==
     "\xdd\xaf\x35\xa1\x93\x61\x7a\xba\xcc\x41\x73\x49\xae\x20\x41\x31\x12\xe6\xfa\x4e\x89\xa9\x7e\xa2" ..

tool/net/demo/.init.lua

@@ -31,9 +31,11 @@ end
 
 -- this intercepts all requests if it's defined
 function OnHttpRequest()
-   Log(kLogInfo, "client is running %s and reports %s" % {
-          finger.GetSynFingerOs(finger.FingerSyn(syn)),
-          VisualizeControlCodes(GetHeader('User-Agent'))})
+   if GetHeader('User-Agent') then
+      Log(kLogInfo, "client is running %s and reports %s" % {
+             finger.GetSynFingerOs(finger.FingerSyn(syn)),
+             VisualizeControlCodes(GetHeader('User-Agent'))})
+   end
    if HasParam('magic') then
       Write('<p>\r\n')
       Write('OnHttpRequest() has intercepted your request<br>\r\n')

tool/net/lfuncs.c

@@ -267,16 +267,20 @@ int LuaParseParams(lua_State *L) {
   size_t size;
   const char *data;
   struct UrlParams h;
-  data = luaL_checklstring(L, 1, &size);
-  bzero(&h, sizeof(h));
-  if ((m = ParseParams(data, size, &h))) {
-    LuaPushUrlParams(L, &h);
-    free(h.p);
-    free(m);
-    return 1;
+  if (!lua_isnoneornil(L, 1)) {
+    data = luaL_checklstring(L, 1, &size);
+    bzero(&h, sizeof(h));
+    if ((m = ParseParams(data, size, &h))) {
+      LuaPushUrlParams(L, &h);
+      free(h.p);
+      free(m);
+      return 1;
+    } else {
+      luaL_error(L, "out of memory");
+      unreachable;
+    }
   } else {
-    luaL_error(L, "out of memory");
-    unreachable;
+    return lua_gettop(L);
   }
 }
 
@@ -285,17 +289,21 @@ int LuaParseHost(lua_State *L) {
   size_t n;
   struct Url h;
   const char *p;
-  bzero(&h, sizeof(h));
-  p = luaL_checklstring(L, 1, &n);
-  if ((m = ParseHost(p, n, &h))) {
-    lua_newtable(L);
-    LuaPushUrlView(L, &h.host);
-    LuaPushUrlView(L, &h.port);
-    free(m);
-    return 1;
+  if (!lua_isnoneornil(L, 1)) {
+    bzero(&h, sizeof(h));
+    p = luaL_checklstring(L, 1, &n);
+    if ((m = ParseHost(p, n, &h))) {
+      lua_newtable(L);
+      LuaPushUrlView(L, &h.host);
+      LuaPushUrlView(L, &h.port);
+      free(m);
+      return 1;
+    } else {
+      luaL_error(L, "out of memory");
+      unreachable;
+    }
   } else {
-    luaL_error(L, "out of memory");
-    unreachable;
+    return lua_gettop(L);
   }
 }
 
@@ -347,16 +355,20 @@ int LuaCrc32c(lua_State *L) {
 int LuaIndentLines(lua_State *L) {
   void *p;
   size_t n, j;
-  p = luaL_checklstring(L, 1, &n);
-  j = luaL_optinteger(L, 2, 1);
-  if (!(0 <= j && j <= 65535)) {
-    luaL_argerror(L, 2, "not in range 0..65535");
-    unreachable;
+  if (!lua_isnoneornil(L, 1)) {
+    p = luaL_checklstring(L, 1, &n);
+    j = luaL_optinteger(L, 2, 1);
+    if (!(0 <= j && j <= 65535)) {
+      luaL_argerror(L, 2, "not in range 0..65535");
+      unreachable;
+    }
+    p = IndentLines(p, n, &n, j);
+    lua_pushlstring(L, p, n);
+    free(p);
+    return 1;
+  } else {
+    return lua_gettop(L);
   }
-  p = IndentLines(p, n, &n, j);
-  lua_pushlstring(L, p, n);
-  free(p);
-  return 1;
 }
 
 int LuaGetMonospaceWidth(lua_State *L) {
@@ -624,15 +636,19 @@ static dontinline int LuaCoderImpl(lua_State *L,
                                    char *C(const char *, size_t, size_t *)) {
   void *p;
   size_t n;
-  p = luaL_checklstring(L, 1, &n);
-  if ((p = C(p, n, &n))) {
-    lua_pushlstring(L, p, n);
-    free(p);
+  if (!lua_isnoneornil(L, 1)) {
+    p = luaL_checklstring(L, 1, &n);
+    if ((p = C(p, n, &n))) {
+      lua_pushlstring(L, p, n);
+      free(p);
+    } else {
+      luaL_error(L, "out of memory");
+      unreachable;
+    }
+    return 1;
   } else {
-    luaL_error(L, "out of memory");
-    unreachable;
+    return lua_gettop(L);
   }
-  return 1;
 }
 
 static dontinline int LuaCoder(lua_State *L,
@@ -715,11 +731,15 @@ static dontinline int LuaHasherImpl(lua_State *L, size_t k,
   void *p;
   size_t n;
   uint8_t d[64];
-  p = luaL_checklstring(L, 1, &n);
-  H(p, n, d);
-  lua_pushlstring(L, (void *)d, k);
-  mbedtls_platform_zeroize(d, sizeof(d));
-  return 1;
+  if (!lua_isnoneornil(L, 1)) {
+    p = luaL_checklstring(L, 1, &n);
+    H(p, n, d);
+    lua_pushlstring(L, (void *)d, k);
+    mbedtls_platform_zeroize(d, sizeof(d));
+    return 1;
+  } else {
+    return lua_gettop(L);
+  }
 }
 
 static dontinline int LuaHasher(lua_State *L, size_t k,