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Message: [QUOTE="Keith Thompson, post: 4027009"] Note that ``end - string'' yields a value of type ptrdiff_t, a signed type which very likely can't represent all values of type size_t. This is unlikely to be an issue in practice. On typical 32-bit systems, problems show up only for strings longer than 2 gigabytes, and even then the properties of 2's-complement arithmetic are likely to result in the correct answer anyway. But all this analysis, resulting in the conclusion that it will almost certainly work properly, becomes unnecessary if you just use strlen(). [/QUOTE]