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Fix some serious logical errors in CStrInCStrNoCase pointed out by Bill.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50826 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek 2008-05-07 19:22:36 +00:00
parent 671fa97a4b
commit fdedd5397d
1 changed files with 8 additions and 5 deletions
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13
include/llvm/ADT/StringExtras.h
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@ -144,26 +144,29 @@ static inline bool StringsEqualNoCase(const std::string &LHS,
/// 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