Changeset 16324 in vbox

Timestamp:

Jan 28, 2009 6:06:59 PM (16 years ago)

Author:

vboxsync

Message:

COM: teach Utf8Str substr() like std::string

Location:

trunk

Files:

• include/VBox/com/string.h (modified) (2 diffs)
• src/VBox/Main/glue/string.cpp (modified) (2 diffs)

trunk/include/VBox/com/string.h

@@ -442 +442 @@
     const char *raw() const { return str; }
 
+    /** The same as operator const char *(), but for situations where the compiler
+        cannot typecast implicitly (for example, in printf() argument list). */
+    const char *c_str() const { return str; }
+
     /**
      *  Returns a non-const raw pointer that allows to modify the string directly.
@@ -495 +499 @@
         return *this;
     }
+
+    static const size_t npos;
+
+    Utf8Str substr(size_t pos = 0, size_t n = npos) const;
 
     /**

trunk/src/VBox/Main/glue/string.cpp

@@ -35 +35 @@
 /* static */
 const Utf8Str Utf8Str::Null; /* default ctor is OK */
+
+const size_t Utf8Str::npos = (size_t)-1;
+
+Utf8Str Utf8Str::substr(size_t pos /*= 0*/, size_t n /*= npos*/) const
+{
+    Utf8Str ret;
+
+    if (n)
+    {
+        const char *psz = c_str();
+        RTUNICP cp;
+
+        // walk the UTF-8 characters until where the caller wants to start
+        size_t i = pos;
+        while (i--)
+            RTStrGetCpEx(&psz, &cp);
+
+        const char *pFirst = psz;
+
+        if (n == npos)
+            // all the rest:
+            ret = pFirst;
+        else
+        {
+            i = n;
+            while (i--)
+                RTStrGetCpEx(&psz, &cp);
+
+            size_t len = psz - pFirst;
+            char *psz = (char*)RTMemAlloc(len + 1);
+            memcpy(psz, pFirst, len);
+            psz[len] = '\0';
+            ret = psz;
+            RTMemFree(psz);
+        }
+    }
+
+    return ret;
+}
 
 struct FormatData
@@ -99 +138 @@
 }
 
+
 } /* namespace com */