rcc: Avoid needless use of macro

strlen on literals gets typically optimized out nowadays.

Adjust callee side to handle the off-by-one between sizeof(literal)
and strlen().

Change-Id: I1551f69a160922681d66024701ba1bd8f6dc03bf
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>

src/tools/rcc/rcc.cpp

@@ -67,11 +67,8 @@ enum {
 #  define CONSTANT_COMPRESSALGO_DEFAULT     RCCResourceLibrary::CompressionAlgorithm::None
 #endif
 
-#define writeString(s) write(s, sizeof(s))
-
 void RCCResourceLibrary::write(const char *str, int len)
 {
-    --len; // trailing \0 on string literals...
     int n = m_out.size();
     m_out.resize(n + len);
     memcpy(m_out.data() + n, str, len);
@@ -983,7 +980,7 @@ void RCCResourceLibrary::writeDecimal(int value)
     Q_ASSERT(m_format != RCCResourceLibrary::Binary);
     char buf[std::numeric_limits<int>::digits10 + 2];
     int n = snprintf(buf, sizeof(buf), "%d", value);
-    write(buf, n + 1);  // write() takes a size including terminating NUL
+    write(buf, n);
 }
 
 static const char hexDigits[] = "0123456789abcdef";

src/tools/rcc/rcc.h

@@ -143,6 +143,7 @@ private:
     void writeChar(char c) { m_out.append(c); }
     void writeByteArray(const QByteArray &);
     void write(const char *, int len);
+    void writeString(const char *s) { write(s, static_cast<int>(strlen(s))); }
 
 #if QT_CONFIG(zstd)
     ZSTD_CCtx *m_zstdCCtx;