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-rw-r--r--str_diff.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/str_diff.c b/str_diff.c
new file mode 100644
index 0000000..071e7f5
--- /dev/null
+++ b/str_diff.c
@@ -0,0 +1,15 @@
+#include "str.h"
+
+int str_diff(register const char *s,register const char *t)
+{
+ register char x;
+
+ for (;;) {
+ x = *s; if (x != *t) break; if (!x) break; ++s; ++t;
+ x = *s; if (x != *t) break; if (!x) break; ++s; ++t;
+ x = *s; if (x != *t) break; if (!x) break; ++s; ++t;
+ x = *s; if (x != *t) break; if (!x) break; ++s; ++t;
+ }
+ return ((int)(unsigned int)(unsigned char) x)
+ - ((int)(unsigned int)(unsigned char) *t);
+}