fix(3p/nix): apply all clang-tidy fixes r/1495

Change-Id: I265e763393422ee1881653527c91024458060825
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1432
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

1 files changed, 8 insertions, 7 deletions

diff --git a/third_party/nix/src/libutil/hash.cc b/third_party/nix/src/libutil/hash.cc
index 0d80972cceda..9165182ed70f 100644
--- a/third_party/nix/src/libutil/hash.cc
+++ b/third_party/nix/src/libutil/hash.cc
@@ -86,7 +86,7 @@ static std::string printHash32(const Hash& hash) {
   std::string s;
   s.reserve(len);
 
-  for (int n = (int)len - 1; n >= 0; n--) {
+  for (int n = static_cast<int>(len) - 1; n >= 0; n--) {
     unsigned int b = n * 5;
     unsigned int i = b / 8;
     unsigned int j = b % 8;
@@ -119,7 +119,8 @@ std::string Hash::to_string(Base base, bool includeType) const {
     case Base64:
     case SRI:
       std::string b64;
-      absl::Base64Escape(std::string((const char*)hash, hashSize), &b64);
+      absl::Base64Escape(
+          std::string(reinterpret_cast<const char*>(hash), hashSize), &b64);
       s += b64;
       break;
   }
@@ -179,7 +180,7 @@ Hash::Hash(const std::string& s, HashType type) : type(type) {
   else if (!isSRI && size == base32Len()) {
     for (unsigned int n = 0; n < size; ++n) {
       char c = s[pos + size - n - 1];
-      unsigned char digit;
+      unsigned char digit = 0;
       for (digit = 0; digit < base32Chars.size(); ++digit) { /* !!! slow */
         if (base32Chars[digit] == c) {
           break;
@@ -267,16 +268,16 @@ static void finish(HashType ht, Ctx& ctx, unsigned char* hash) {
 }
 
 Hash hashString(HashType ht, const std::string& s) {
-  Ctx ctx;
+  Ctx ctx{};
   Hash hash(ht);
   start(ht, ctx);
-  update(ht, ctx, (const unsigned char*)s.data(), s.length());
+  update(ht, ctx, reinterpret_cast<const unsigned char*>(s.data()), s.length());
   finish(ht, ctx, hash.hash);
   return hash;
 }
 
 Hash hashFile(HashType ht, const Path& path) {
-  Ctx ctx;
+  Ctx ctx{};
   Hash hash(ht);
   start(ht, ctx);
 
@@ -286,7 +287,7 @@ Hash hashFile(HashType ht, const Path& path) {
   }
 
   std::vector<unsigned char> buf(8192);
-  ssize_t n;
+  ssize_t n = 0;
   while ((n = read(fd.get(), buf.data(), buf.size())) != 0) {
     checkInterrupt();
     if (n == -1) {