COMMON: Provide our own implementations for scumm_str(n)icmp

This takes up a tiny little bit of extra binary size, but gets
rid of some awful #ifdef hackery.

1 files changed, 33 insertions, 0 deletions

diff --git a/common/str.cpp b/common/str.cpp
index 08a6cb6822..740e7b6a06 100644
--- a/common/str.cpp
+++ b/common/str.cpp
@@ -833,3 +833,36 @@ size_t strlcat(char *dst, const char *src, size_t size) {
 }
 
 }	// End of namespace Common
+
+// Portable implementation of stricmp / strcasecmp / strcmpi.
+// TODO: Rename this to Common::strcasecmp
+int scumm_stricmp(const char *s1, const char *s2) {
+	byte l1, l2;
+	do {
+		// Don't use ++ inside tolower, in case the macro uses its
+		// arguments more than once.
+		l1 = (byte)*s1++;
+		l1 = tolower(l1);
+		l2 = (byte)*s2++;
+		l2 = tolower(l2);
+	} while (l1 == l2 && l1 != 0);
+	return l1 - l2;
+}
+
+// Portable implementation of strnicmp / strncasecmp / strncmpi.
+// TODO: Rename this to Common::strncasecmp
+int scumm_strnicmp(const char *s1, const char *s2, uint n) {
+	byte l1, l2;
+	do {
+		if (n-- == 0)
+			return 0;	// no difference found so far -> signal equality
+
+		// Don't use ++ inside tolower, in case the macro uses its
+		// arguments more than once.
+		l1 = (byte)*s1++;
+		l1 = tolower(l1);
+		l2 = (byte)*s2++;
+		l2 = tolower(l2);
+	} while (l1 == l2 && l1 != 0);
+	return l1 - l2;
+}