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112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
#ifndef CPPCSTRING_H
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#define CPPCSTRING_H
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// cppcstring.h
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// 10/12/2014 jichi
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#include <cstddef> // for size_t
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#include <cstring>
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//#include <algorithm> // for std::min
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// strlen
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template <typename charT>
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inline size_t cpp_basic_strlen(const charT *s)
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{
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const charT *p = s;
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while (*p) p++;
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return p - s;
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}
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inline size_t cpp_strlen(const char *s) { return cpp_basic_strlen<char>(s); }
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inline size_t cpp_wstrlen(const wchar_t *s) { return cpp_basic_strlen<wchar_t>(s); }
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template <typename charT>
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inline size_t cpp_basic_strnlen(const charT *s, size_t n)
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{
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const charT *p = s;
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while (*p && n) p++, n--;
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return p - s;
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}
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inline size_t cpp_strnlen(const char *s, size_t n) { return cpp_basic_strnlen<char>(s, n); }
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inline size_t cpp_wstrnlen(const wchar_t *s, size_t n) { return cpp_basic_strnlen<wchar_t>(s, n); }
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// strnchr
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#define cpp_basic_strnchr_(s, c, n) \
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{ \
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while (*s && n) { \
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if (*s == c) \
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return s; \
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s++, n--; \
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} \
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return nullptr; \
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}
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template <typename charT>
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inline charT *cpp_basic_strnchr(charT *s, charT c, size_t n) cpp_basic_strnchr_(s, c, n)
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template <typename charT>
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inline const charT *cpp_basic_strnchr(const charT *s, charT c, size_t n) cpp_basic_strnchr_(s, c, n)
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// The same as memchr
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inline char *cpp_strnchr(char *s, char c, size_t n) { return cpp_basic_strnchr<char>(s, c, n); }
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inline const char *cpp_strnchr(const char *s, char c, size_t n) { return cpp_basic_strnchr<char>(s, c, n); }
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inline wchar_t *cpp_wcsnchr(wchar_t *s, wchar_t c, size_t n) { return cpp_basic_strnchr<wchar_t>(s, c, n); }
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inline const wchar_t *cpp_wcsnchr(const wchar_t *s, wchar_t c, size_t n) { return cpp_basic_strnchr<wchar_t>(s, c, n); }
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// strnstr
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#define cpp_basic_strnstr_(s, slen, r, rlen, ncmp) \
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{ \
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while (*s && slen >= rlen) { \
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if (ncmp(s, r, slen < rlen ? slen : rlen) == 0) \
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return s; \
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s++, slen--; \
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} \
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return nullptr; \
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}
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template <typename charT>
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inline charT *cpp_basic_strnstr(charT *s, const charT *r, size_t n) cpp_basic_strnstr_(s, n, r, ::strlen(r), ::strncmp)
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template <typename charT>
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inline const charT *cpp_basic_strnstr(const charT *s, const charT *r, size_t n) cpp_basic_strnstr_(s, n, r, ::strlen(r), ::strncmp)
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template <>
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inline wchar_t *cpp_basic_strnstr<wchar_t>(wchar_t *s, const wchar_t *r, size_t n) cpp_basic_strnstr_(s, n, r, ::wcslen(r), ::wcsncmp)
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template <>
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inline const wchar_t *cpp_basic_strnstr<wchar_t>(const wchar_t *s, const wchar_t *r, size_t n) cpp_basic_strnstr_(s, n, r, ::wcslen(r), ::wcsncmp)
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inline char *cpp_strnstr(char *s, const char *r, size_t n) { return cpp_basic_strnstr<char>(s, r, n); }
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inline const char *cpp_strnstr(const char *s, const char *r, size_t n) { return cpp_basic_strnstr<char>(s, r, n); }
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inline wchar_t *cpp_wcsnstr(wchar_t *s, const wchar_t *r, size_t n) { return cpp_basic_strnstr<wchar_t>(s, r, n); }
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inline const wchar_t *cpp_wcsnstr(const wchar_t *s, const wchar_t *r, size_t n) { return cpp_basic_strnstr<wchar_t>(s, r, n); }
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// strnpbrk
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// it might be faster to use strchr functions, which is not portable though
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#define cpp_basic_strnpbrk_(s, sep, n) \
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{ \
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while (*s && n) { \
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for (auto p = sep; *p; p++) \
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if (*s == *p) \
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return s; \
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s++, n--; \
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} \
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return nullptr; \
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}
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template <typename charT, typename char2T>
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inline charT *cpp_basic_strnpbrk(charT *dest, const char2T *breakset, size_t n)
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cpp_basic_strnpbrk_(dest, breakset, n)
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template <typename charT, typename char2T>
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inline const charT *cpp_basic_strnpbrk(const charT *dest, const char2T *breakset, size_t n)
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cpp_basic_strnpbrk_(dest, breakset, n)
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inline char *cpp_strnpbrk(char *dest, const char *breakset, size_t n) { return cpp_basic_strnpbrk(dest, breakset, n); }
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inline const char *cpp_strnpbrk(const char *dest, const char *breakset, size_t n) { return cpp_basic_strnpbrk(dest, breakset, n); }
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inline wchar_t *cpp_wcsnpbrk(wchar_t *dest, const wchar_t *breakset, size_t n) { return cpp_basic_strnpbrk(dest, breakset, n); }
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inline const wchar_t *cpp_wcsnpbrk(const wchar_t *dest, const wchar_t *breakset, size_t n) { return cpp_basic_strnpbrk(dest, breakset, n); }
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#endif // CPPCSTRING_H
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