Implement an interface compatible wcslcpy and strlcpy. Possibly slightly
slower than the OpenBSD implementation, but a bit clearer and fits our style.
Move file_util_posix to use it now that we have it everywhere.
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@798 0039d316-1c4b-4281-b951-d872f2087c98
CrOS-Libchrome-Original-Commit: 954d58c4d2bd4499ed61da01ee22684669e12f28
diff --git a/base/string_util.cc b/base/string_util.cc
index 864612a..7208cd0 100644
--- a/base/string_util.cc
+++ b/base/string_util.cc
@@ -1384,3 +1384,34 @@
StringToDouble(value, &result);
return result;
}
+
+// The following code is compatible with the OpenBSD lcpy interface. See:
+// http://www.gratisoft.us/todd/papers/strlcpy.html
+// ftp://ftp.openbsd.org/pub/OpenBSD/src/lib/libc/string/{wcs,str}lcpy.c
+
+namespace {
+
+template <typename CHAR>
+size_t lcpyT(CHAR* dst, const CHAR* src, size_t dst_size) {
+ for (size_t i = 0; i < dst_size; ++i) {
+ if ((dst[i] = src[i]) == 0) // We hit and copied the terminating NULL.
+ return i;
+ }
+
+ // We were left off at dst_size. We over copied 1 byte. Null terminate.
+ if (dst_size != 0)
+ dst[dst_size - 1] = 0;
+
+ // Count the rest of the |src|, and return it's length in characters.
+ while (src[dst_size]) ++dst_size;
+ return dst_size;
+}
+
+} // namespace
+
+size_t base::strlcpy(char* dst, const char* src, size_t dst_size) {
+ return lcpyT<char>(dst, src, dst_size);
+}
+size_t base::wcslcpy(wchar_t* dst, const wchar_t* src, size_t dst_size) {
+ return lcpyT<wchar_t>(dst, src, dst_size);
+}