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    • C语言关于字符串的操作函数有哪些？

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    其他回答
    第1个回答  2012-06-04
    字符串连接函数：strcat
    字符串复制函数：strcpy
    字符串比较函数：strcmp
    测字符串长度函数：strlen
    第2个回答  2012-06-04
    字符串的截取，字符串的排序
    第3个回答  2012-06-04
    /*
    * string.h
    * This file has no copyright assigned and is placed in the Public Domain.
    * This file is a part of the mingw-runtime package.
    * No warranty is given; refer to the file DISCLAIMER within the package.
    *
    * Definitions for memory and string functions.
    *
    */

    #ifndef _STRING_H_
    #define _STRING_H_

    /* All the headers include this file. */
    #include <_mingw.h>

    /*
    * Define size_t, wchar_t and NULL
    */
    #define __need_size_t
    #define __need_wchar_t
    #define __need_NULL
    #ifndef RC_INVOKED
    #include <stddef.h>
    #endif /* Not RC_INVOKED */

    #ifndef RC_INVOKED

    #ifdef __cplusplus
    extern "C" {
    #endif

    /*
    * Prototypes of the ANSI Standard C library string functions.
    */
    _CRTIMP void* __cdecl __MINGW_NOTHROW memchr (const void*, int, size_t) __MINGW_ATTRIB_PURE;
    _CRTIMP int __cdecl __MINGW_NOTHROW memcmp (const void*, const void*, size_t) __MINGW_ATTRIB_PURE;
    _CRTIMP void* __cdecl __MINGW_NOTHROW memcpy (void*, const void*, size_t);
    _CRTIMP void* __cdecl __MINGW_NOTHROW memmove (void*, const void*, size_t);
    _CRTIMP void* __cdecl __MINGW_NOTHROW memset (void*, int, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strcat (char*, const char*);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strchr (const char*, int) __MINGW_ATTRIB_PURE;
    _CRTIMP int __cdecl __MINGW_NOTHROW strcmp (const char*, const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP int __cdecl __MINGW_NOTHROW strcoll (const char*, const char*); /* Compare using locale */
    _CRTIMP char* __cdecl __MINGW_NOTHROW strcpy (char*, const char*);
    _CRTIMP size_t __cdecl __MINGW_NOTHROW strcspn (const char*, const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strerror (int); /* NOTE: NOT an old name wrapper. */

    _CRTIMP size_t __cdecl __MINGW_NOTHROW strlen (const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strncat (char*, const char*, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW strncmp (const char*, const char*, size_t) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strncpy (char*, const char*, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strpbrk (const char*, const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strrchr (const char*, int) __MINGW_ATTRIB_PURE;
    _CRTIMP size_t __cdecl __MINGW_NOTHROW strspn (const char*, const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strstr (const char*, const char*) __MINGW_ATTRIB_PURE;
    _CRTIMP char* __cdecl __MINGW_NOTHROW strtok (char*, const char*);
    _CRTIMP size_t __cdecl __MINGW_NOTHROW strxfrm (char*, const char*, size_t);

    #ifndef __STRICT_ANSI__
    /*
    * Extra non-ANSI functions provided by the CRTDLL library
    */
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strerror (const char *);
    _CRTIMP void* __cdecl __MINGW_NOTHROW _memccpy (void*, const void*, int, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW _memicmp (const void*, const void*, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strdup (const char*) __MINGW_ATTRIB_MALLOC;
    _CRTIMP int __cdecl __MINGW_NOTHROW _strcmpi (const char*, const char*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _stricmp (const char*, const char*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _stricoll (const char*, const char*);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strlwr (char*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _strnicmp (const char*, const char*, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strnset (char*, int, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strrev (char*);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strset (char*, int);
    _CRTIMP char* __cdecl __MINGW_NOTHROW _strupr (char*);
    _CRTIMP void __cdecl __MINGW_NOTHROW _swab (const char*, char*, size_t);

    #ifdef __MSVCRT__
    _CRTIMP int __cdecl __MINGW_NOTHROW _strncoll(const char*, const char*, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW _strnicoll(const char*, const char*, size_t);
    #endif

    #ifndef _NO_OLDNAMES
    /*
    * Non-underscored versions of non-ANSI functions. They live in liboldnames.a
    * and provide a little extra portability. Also a few extra UNIX-isms like
    * strcasecmp.
    */
    _CRTIMP void* __cdecl __MINGW_NOTHROW memccpy (void*, const void*, int, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW memicmp (const void*, const void*, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strdup (const char*) __MINGW_ATTRIB_MALLOC;
    _CRTIMP int __cdecl __MINGW_NOTHROW strcmpi (const char*, const char*);
    _CRTIMP int __cdecl __MINGW_NOTHROW stricmp (const char*, const char*);
    __CRT_INLINE int __cdecl __MINGW_NOTHROW strcasecmp (const char*, const char *);
    __CRT_INLINE int __cdecl __MINGW_NOTHROW
    strcasecmp (const char * __sz1, const char * __sz2)
    {return _stricmp (__sz1, __sz2);}
    _CRTIMP int __cdecl __MINGW_NOTHROW stricoll (const char*, const char*);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strlwr (char*);
    _CRTIMP int __cdecl __MINGW_NOTHROW strnicmp (const char*, const char*, size_t);
    __CRT_INLINE int __cdecl __MINGW_NOTHROW strncasecmp (const char *, const char *, size_t);
    __CRT_INLINE int __cdecl __MINGW_NOTHROW
    strncasecmp (const char * __sz1, const char * __sz2, size_t __sizeMaxCompare)
    {return _strnicmp (__sz1, __sz2, __sizeMaxCompare);}
    _CRTIMP char* __cdecl __MINGW_NOTHROW strnset (char*, int, size_t);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strrev (char*);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strset (char*, int);
    _CRTIMP char* __cdecl __MINGW_NOTHROW strupr (char*);
    #ifndef _UWIN
    _CRTIMP void __cdecl __MINGW_NOTHROW swab (const char*, char*, size_t);
    #endif /* _UWIN */
    #endif /* _NO_OLDNAMES */

    #endif /* Not __STRICT_ANSI__ */

    #ifndef _WSTRING_DEFINED
    /*
    * Unicode versions of the standard calls.
    * Also in wchar.h, where they belong according to ISO standard.
    */
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcscat (wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcschr (const wchar_t*, wchar_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcscmp (const wchar_t*, const wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcscoll (const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcscpy (wchar_t*, const wchar_t*);
    _CRTIMP size_t __cdecl __MINGW_NOTHROW wcscspn (const wchar_t*, const wchar_t*);
    /* Note: _wcserror requires __MSVCRT_VERSION__ >= 0x0700. */
    _CRTIMP size_t __cdecl __MINGW_NOTHROW wcslen (const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsncat (wchar_t*, const wchar_t*, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcsncmp(const wchar_t*, const wchar_t*, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsncpy(wchar_t*, const wchar_t*, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcspbrk(const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsrchr(const wchar_t*, wchar_t);
    _CRTIMP size_t __cdecl __MINGW_NOTHROW wcsspn(const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsstr(const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcstok(wchar_t*, const wchar_t*);
    _CRTIMP size_t __cdecl __MINGW_NOTHROW wcsxfrm(wchar_t*, const wchar_t*, size_t);

    #ifndef __STRICT_ANSI__
    /*
    * Unicode versions of non-ANSI string functions provided by CRTDLL.
    */

    /* NOTE: _wcscmpi not provided by CRTDLL, this define is for portability */
    #define _wcscmpi _wcsicmp

    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcsdup (const wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _wcsicmp (const wchar_t*, const wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _wcsicoll (const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcslwr (wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW _wcsnicmp (const wchar_t*, const wchar_t*, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcsnset (wchar_t*, wchar_t, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcsrev (wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcsset (wchar_t*, wchar_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcsupr (wchar_t*);

    #ifdef __MSVCRT__
    _CRTIMP int __cdecl __MINGW_NOTHROW _wcsncoll(const wchar_t*, const wchar_t*, size_t);
    _CRTIMP int __cdecl __MINGW_NOTHROW _wcsnicoll(const wchar_t*, const wchar_t*, size_t);
    #if __MSVCRT_VERSION__ >= 0x0700
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW _wcserror(int);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW __wcserror(const wchar_t*);
    #endif
    #endif

    #ifndef _NO_OLDNAMES
    /* NOTE: There is no _wcscmpi, but this is for compatibility. */
    int __cdecl __MINGW_NOTHROW wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2);
    __CRT_INLINE int __cdecl __MINGW_NOTHROW
    wcscmpi (const wchar_t * __ws1, const wchar_t * __ws2)
    {return _wcsicmp (__ws1, __ws2);}
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsdup (const wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcsicmp (const wchar_t*, const wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcsicoll (const wchar_t*, const wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcslwr (wchar_t*);
    _CRTIMP int __cdecl __MINGW_NOTHROW wcsnicmp (const wchar_t*, const wchar_t*, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsnset (wchar_t*, wchar_t, size_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsrev (wchar_t*);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsset (wchar_t*, wchar_t);
    _CRTIMP wchar_t* __cdecl __MINGW_NOTHROW wcsupr (wchar_t*);
    #endif /* Not _NO_OLDNAMES */

    #endif /* Not strict ANSI */

    #define _WSTRING_DEFINED
    #endif /* _WSTRING_DEFINED */

    #ifdef __cplusplus
    }
    #endif

    #endif /* Not RC_INVOKED */

    #endif /* Not _STRING_H_ */
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