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string: add strncmp

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-10-01 23:17:56 +02:00
parent 7ea1870552
commit d7a44c2929
1 changed files with 23 additions and 0 deletions
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23
include/stdex/string.hpp
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@ -379,6 +379,29 @@ namespace stdex
return 0; return 0;
} }
///
/// Binary compare two strings
///
/// \param[in] str1 String 1
/// \param[in] str2 String 2
/// \param[in] count String 1 and 2 code unit count limit
///
/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
///
template <class T1, class T2>
inline int strncmp(_In_reads_or_z_opt_(count) const T1* str1, _In_reads_or_z_opt_(count) const T2* str2, _In_ size_t count)
{
assert((str1 && str2) || !count);
size_t i; T1 a; T2 b;
for (i = 0; i < count && ((a = str1[i]) | (b = str2[i])); ++i) {
if (a > b) return +1;
if (a < b) return -1;
}
if (i < count && str1[i]) return +1;
if (i < count && str2[i]) return -1;
return 0;
}
/// ///
/// Lexigraphically compare two strings /// Lexigraphically compare two strings
/// ///