COMMON: Add strcpy_s and strcat_s

These functions will issue warnings and truncate strings.
It's like strlcpy and strlcat but noisier.
There are also versions automatically determining size based on the destination
array size.
This raises a compilation error when the size cannot be determined by
the compiler.

common/str.cpp

@@ -736,6 +736,88 @@ String tag2string(uint32 tag, bool nonPrintable) {
 
 #endif
 
+// When str.cpp is used in devtools warning is not defined
+#ifdef SCUMMVM_UTIL
+#define warning(msg, ...)
+#endif
+
+// Our simple implementation of strcpy_s and strcat_s
+// We don't check for overlapping strings and we issue warnings instead of erroring out
+void strcpy_s(char *dst, size_t size, const char *src) {
+	if (!dst) {
+		warning("%s: dst is nullptr", __func__);
+		return;
+	}
+	if (!src) {
+		warning("%s: src is nullptr", __func__);
+		return;
+	}
+	if (!size) {
+		warning("%s: size is zero", __func__);
+		return;
+	}
+
+	if (dst == src) {
+		// Nothing to do
+		return;
+	}
+
+	// Copy over (size - 1) bytes at max.
+	while (size != 0) {
+		*dst = *src;
+		if (*dst == '\0') {
+			return;
+		}
+		++dst;
+		++src;
+		--size;
+	}
+
+	warning("%s: truncating string", __func__);
+	dst[-1] = '\0';
+}
+
+void strcat_s(char *dst, size_t size, const char *src) {
+	if (!dst) {
+		warning("%s: dst is nullptr", __func__);
+		return;
+	}
+	if (!src) {
+		warning("%s: src is nullptr", __func__);
+		return;
+	}
+	if (!size) {
+		warning("%s: size is zero", __func__);
+		return;
+	}
+
+	// Search the end of the destination, but do not
+	// move past the terminating zero.
+	while(*dst != '\0') {
+		++dst;
+		--size;
+		if (!size) {
+			warning("%s: dst is unterminated", __func__);
+			return;
+		}
+	}
+
+	// Copy over all of the source that fits
+	// the destination buffer.
+	while (size != 0) {
+		*dst = *src;
+		if (*dst == '\0') {
+			return;
+		}
+		++dst;
+		++src;
+		--size;
+	}
+
+	warning("%s: truncating string", __func__);
+	dst[-1] = '\0';
+}
+
 size_t strlcpy(char *dst, const char *src, size_t size) {
 	// Our backup of the source's start, we need this
 	// to calculate the source's length.