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string: add strrcmp and strrncmp

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-12-22 09:05:55 +01:00
parent 09b59e698d
commit ba38dad49d
1 changed files with 102 additions and 0 deletions
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102
include/stdex/string.hpp
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@ -847,6 +847,108 @@ namespace stdex
return strncmp(str1, N1, str2, N2); return strncmp(str1, N1, str2, N2);
} }
///
/// Binary compare two strings in reverse direction
///
/// \param[in] str1 String 1
/// \param[in] str2 String 2
///
/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
///
template <class T1, class T2>
inline int strrcmp(_In_z_ const T1* str1, _In_z_ const T2* str2)
{
size_t
i = strlen(str1),
j = strlen(str2);
_Assume_(str1 || !i);
_Assume_(str2 || !j);
size_t k; T1 a; T2 b;
for (k = 1; i && j; k++) {
i--; j--;
if ((a = str1[i]) > (b = str2[j])) return +1;
if (a < b) return -1;
}
if (i && !j) return +1;
if (!i && j) return -1;
return 0;
}
///
/// Binary compare two strings in reverse direction
///
/// \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 strrncmp(_In_reads_or_z_opt_(count) const T1* str1, _In_reads_or_z_opt_(count) const T2* str2, _In_ size_t count)
{
size_t
i = strnlen(str1, count),
j = strnlen(str2, count);
_Assume_(str1 || !i);
_Assume_(str2 || !j);
size_t k; T1 a; T2 b;
for (k = 1; i && j; k++) {
i--; j--;
if ((a = str1[i]) > (b = str2[j])) return +1;
if (a < b) return -1;
}
if (i && !j) return +1;
if (!i && j) return -1;
return 0;
}
///
/// Binary compare two strings in reverse direction
///
/// \param[in] str1 String 1
/// \param[in] count1 String 1 code unit count limit
/// \param[in] str2 String 2
/// \param[in] count2 String 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 strrncmp(
_In_reads_or_z_opt_(count1) const T1* str1, _In_ size_t count1,
_In_reads_or_z_opt_(count2) const T2* str2, _In_ size_t count2)
{
size_t
i = strnlen(str1, count1),
j = strnlen(str2, count2);
_Assume_(str1 || !i);
_Assume_(str2 || !j);
size_t k; T1 a; T2 b;
for (k = 1; i && j; k++) {
i--; j--;
if ((a = str1[i]) > (b = str2[j])) return +1;
if (a < b) return -1;
}
if (i && !j) return +1;
if (!i && j) return -1;
return 0;
}
///
/// Binary compare two strings
///
/// \param[in] str1 String 1
/// \param[in] str2 String 2
///
/// \return Negative if str1<str2; positive if str1>str2; zero if str1==str2
///
template <class T1, size_t N1, class T2, size_t N2>
inline int strrncmp(
_In_ const T1 (&str1)[N1],
_In_ const T2 (&str2)[N2])
{
return strrncmp(str1, N1, str2, N2);
}
/// ///
/// Binary compare two strings ASCII-case-insensitive /// Binary compare two strings ASCII-case-insensitive
/// ///