/// CStrInCStrNoCase - Portable version of strcasestr. Locates the first
/// occurance of c-string 's1' in string 's2', ignoring case. Returns
-/// NULL if 's1' cannot be found.
+/// NULL if 's1' cannot be found. NOTE: the arguments are provided
+/// in a different order than strcasestr.
static inline const char* CStrInCStrNoCase(const char *s1, const char *s2) {
// Are either strings NULL or empty?
if (!s1 || !s2 || s1[0] == '\0' || s2[0] == '\0')
return 0;
+ if (s1 == s2)
+ return s1;
+
const char *I1=s1, *I2=s2;
while (*I1 != '\0' || *I2 != '\0' )
if (tolower(*I1) != tolower(*I2)) { // No match. Start over.
- ++s1; I1 = s1; I2 = s2;
+ ++s2; I1 = s1; I2 = s2;
}
else { // Character match. Advance to the next character.
++I1; ++I2;
}
- // If we exhausted all of the characters in 's2', then 's1' does not occur
- // in it.
- return *I2 == '\0' ? 0 : I1;
+ // If we exhausted all of the characters in 's1', then 's1' appears in 's2'.
+ return *I1 == '\0' ? s2 : 0;
}
/// getToken - This function extracts one token from source, ignoring any