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Added CStrInCStrNoCase, a portable implementation of strcasestr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50821 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek 2008-05-07 18:35:46 +00:00
parent 14852f27e7
commit 6925f5074f
1 changed files with 24 additions and 0 deletions
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24
include/llvm/ADT/StringExtras.h
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@ -141,6 +141,30 @@ static inline bool StringsEqualNoCase(const std::string &LHS,
}
return RHS[LHS.size()] == 0; // Not too long?
}
/// 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.
static inline const char* CStrInCStrNoCase(const char *s1, const char *s2) {
// Are either strings NULL?
if (!s1 || !s2)
return 0;
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;
}
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;
}
/// getToken - This function extracts one token from source, ignoring any
/// leading characters that appear in the Delimiters string, and ending the