sscanf 实现
场景：哪位高手有c语言实现的sscanf
谁有c语言实现的sscanf？
谁有c语言实现的sscanf？
------解决方案--------------------
/***
*sscanf.c - read formatted data from string
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines scanf() - reads formatted data from string
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <stdarg.h>
#include <string.h>
#include <internal.h>
#include <mtdll.h>
#include <tchar.h>
/***
*static int vscan_fn([w]inputfn, string, [count], format, ...)
*
*Purpose:
* this is a helper function which is called by the other functions
* in this file - sscanf/swscanf/snscanf etc. It calls either _(w)input or
* _(w)input_s depending on the first parameter.
*
*******************************************************************************/
static int __cdecl vscan_fn (
TINPUTFN inputfn,
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
va_list arglist
)
/*
* 'S'tring 'SCAN', 'F'ormatted
*/
{
FILE str = { 0 };
REG1 FILE *infile = &str;
REG2 int retval;
#ifndef _SNSCANF
size_t count;
#endif /* _SNSCANF */
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
#ifndef _SNSCANF
count=_tcslen(string);
#endif /* _SNSCANF */
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if(count>(INT_MAX/sizeof(_TCHAR)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(_TCHAR);
}
retval = (inputfn(infile, format, plocinfo, arglist));
return(retval);
}
/***
*int sscanf(string, format, ...) - read formatted data from string
*
*Purpose:
* Reads formatted data from string into arguments. _input does the real
* work here. Sets up a FILE so file i/o operations can be used, makes
* string look like a huge buffer to it, but _filbuf will refuse to refill
* it if it is exhausted.
*
* Allocate the 'fake' _iob[] entryit statically instead of on
* the stack so that other routines can assume that _iob[] entries are in
* are in DGROUP and, thus, are near.
*
* Multi-thread: (1) Since there is no stream, this routine must never try
* to get the stream lock (i.e., there is no stream lock either). (2)
* Also, since there is only one staticly allocated 'fake' iob, we must
* lock/unlock to prevent collisions.
*
*Entry:
* char *string - string to read data from
* char *format - format string
* followed by list of pointers to storage for the data read. The number
* and type are controlled by the format string.
*
*Exit:
* returns number of fields read and assigned
*
*Exceptions:
*
*******************************************************************************/
/***
*int snscanf(string, size, format, ...) - read formatted data from string of
* given length
*
*Purpose:
* Reads formatted data from string into arguments. _input does the real
* work here. Sets up a FILE so file i/o operations can be used, makes
* string look like a huge buffer to it, but _filbuf will refuse to refill
* it if it is exhausted.
*
* Allocate the 'fake' _iob[] entryit statically instead of on
* the stack so that other routines can assume that _iob[] entries are in
* are in DGROUP and, thus, are near.
*
* Multi-thread: (1) Since there is no stream, this routine must never try
* to get the stream lock (i.e., there is no stream lock either). (2)
* Also, since there is only one staticly allocated 'fake' iob, we must
* lock/unlock to prevent collisions.
*
*Entry:
* char *string - string to read data from
* size_t count - length of string
* char *format - format string
* followed by list of pointers to storage for the data read. The number
* and type are controlled by the format string.
*
*Exit:
* returns number of fields read and assigned
*
*Exceptions:
*
*******************************************************************************/
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf (
#else /* _SNSCANF */
int __cdecl swscanf (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf (
#else /* _SNSCANF */
int __cdecl sscanf (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
...
)
{
va_list arglist;
va_start(arglist, format);
#ifdef _SNSCANF
return vscan_fn(_tinput_l, string, count, format, NULL, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_l, string, format, NULL, arglist);
#endif /* _SNSCANF */
}
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_l (
#else /* _SNSCANF */
int __cdecl _swscanf_l (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_l (
#else /* _SNSCANF */
int __cdecl _sscanf_l (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#ifdef _SNSCANF
return vscan_fn(_tinput_l, string, count, format, plocinfo, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_l, string, format, plocinfo, arglist);
#endif /* _SNSCANF */
}
/***
*int sscanf_s(string, format, ...)
* Same as sscanf above except that it calls _input_s to do the real work.
*
*int snscanf_s(string, size, format, ...)
* Same as snscanf above except that it calls _input_s to do the real work.
*
* _input_s has a size check for array parameters.
*
*******************************************************************************/
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_s (
#else /* _SNSCANF */
int __cdecl swscanf_s (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_s (
#else /* _SNSCANF */
int __cdecl sscanf_s (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
...
)
{
va_list arglist;
va_start(arglist, format);
#ifdef _SNSCANF
return vscan_fn(_tinput_s_l, string, count, format, NULL, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_s_l, string, format, NULL, arglist);
#endif /* _SNSCANF */
}
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_s_l (
#else /* _SNSCANF */
int __cdecl _swscanf_s_l (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_s_l (
#else /* _SNSCANF */
int __cdecl _sscanf_s_l (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#ifdef _SNSCANF
return vscan_fn(_tinput_s_l, string, count, format, plocinfo, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_s_l, string, format, plocinfo, arglist);
#endif /* _SNSCANF */
}
找不到源码按钮，
谁有c语言实现的sscanf？
谁有c语言实现的sscanf？
------解决方案--------------------
/***
*sscanf.c - read formatted data from string
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines scanf() - reads formatted data from string
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <stdarg.h>
#include <string.h>
#include <internal.h>
#include <mtdll.h>
#include <tchar.h>
/***
*static int vscan_fn([w]inputfn, string, [count], format, ...)
*
*Purpose:
* this is a helper function which is called by the other functions
* in this file - sscanf/swscanf/snscanf etc. It calls either _(w)input or
* _(w)input_s depending on the first parameter.
*
*******************************************************************************/
static int __cdecl vscan_fn (
TINPUTFN inputfn,
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
va_list arglist
)
/*
* 'S'tring 'SCAN', 'F'ormatted
*/
{
FILE str = { 0 };
REG1 FILE *infile = &str;
REG2 int retval;
#ifndef _SNSCANF
size_t count;
#endif /* _SNSCANF */
_VALIDATE_RETURN( (string != NULL), EINVAL, EOF);
_VALIDATE_RETURN( (format != NULL), EINVAL, EOF);
#ifndef _SNSCANF
count=_tcslen(string);
#endif /* _SNSCANF */
infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
infile->_ptr = infile->_base = (char *) string;
if(count>(INT_MAX/sizeof(_TCHAR)))
{
/* old-style functions allow any large value to mean unbounded */
infile->_cnt = INT_MAX;
}
else
{
infile->_cnt = (int)count*sizeof(_TCHAR);
}
retval = (inputfn(infile, format, plocinfo, arglist));
return(retval);
}
/***
*int sscanf(string, format, ...) - read formatted data from string
*
*Purpose:
* Reads formatted data from string into arguments. _input does the real
* work here. Sets up a FILE so file i/o operations can be used, makes
* string look like a huge buffer to it, but _filbuf will refuse to refill
* it if it is exhausted.
*
* Allocate the 'fake' _iob[] entryit statically instead of on
* the stack so that other routines can assume that _iob[] entries are in
* are in DGROUP and, thus, are near.
*
* Multi-thread: (1) Since there is no stream, this routine must never try
* to get the stream lock (i.e., there is no stream lock either). (2)
* Also, since there is only one staticly allocated 'fake' iob, we must
* lock/unlock to prevent collisions.
*
*Entry:
* char *string - string to read data from
* char *format - format string
* followed by list of pointers to storage for the data read. The number
* and type are controlled by the format string.
*
*Exit:
* returns number of fields read and assigned
*
*Exceptions:
*
*******************************************************************************/
/***
*int snscanf(string, size, format, ...) - read formatted data from string of
* given length
*
*Purpose:
* Reads formatted data from string into arguments. _input does the real
* work here. Sets up a FILE so file i/o operations can be used, makes
* string look like a huge buffer to it, but _filbuf will refuse to refill
* it if it is exhausted.
*
* Allocate the 'fake' _iob[] entryit statically instead of on
* the stack so that other routines can assume that _iob[] entries are in
* are in DGROUP and, thus, are near.
*
* Multi-thread: (1) Since there is no stream, this routine must never try
* to get the stream lock (i.e., there is no stream lock either). (2)
* Also, since there is only one staticly allocated 'fake' iob, we must
* lock/unlock to prevent collisions.
*
*Entry:
* char *string - string to read data from
* size_t count - length of string
* char *format - format string
* followed by list of pointers to storage for the data read. The number
* and type are controlled by the format string.
*
*Exit:
* returns number of fields read and assigned
*
*Exceptions:
*
*******************************************************************************/
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf (
#else /* _SNSCANF */
int __cdecl swscanf (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf (
#else /* _SNSCANF */
int __cdecl sscanf (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
...
)
{
va_list arglist;
va_start(arglist, format);
#ifdef _SNSCANF
return vscan_fn(_tinput_l, string, count, format, NULL, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_l, string, format, NULL, arglist);
#endif /* _SNSCANF */
}
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_l (
#else /* _SNSCANF */
int __cdecl _swscanf_l (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_l (
#else /* _SNSCANF */
int __cdecl _sscanf_l (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#ifdef _SNSCANF
return vscan_fn(_tinput_l, string, count, format, plocinfo, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_l, string, format, plocinfo, arglist);
#endif /* _SNSCANF */
}
/***
*int sscanf_s(string, format, ...)
* Same as sscanf above except that it calls _input_s to do the real work.
*
*int snscanf_s(string, size, format, ...)
* Same as snscanf above except that it calls _input_s to do the real work.
*
* _input_s has a size check for array parameters.
*
*******************************************************************************/
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_s (
#else /* _SNSCANF */
int __cdecl swscanf_s (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_s (
#else /* _SNSCANF */
int __cdecl sscanf_s (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
...
)
{
va_list arglist;
va_start(arglist, format);
#ifdef _SNSCANF
return vscan_fn(_tinput_s_l, string, count, format, NULL, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_s_l, string, format, NULL, arglist);
#endif /* _SNSCANF */
}
#ifdef _UNICODE
#ifdef _SNSCANF
int __cdecl _snwscanf_s_l (
#else /* _SNSCANF */
int __cdecl _swscanf_s_l (
#endif /* _SNSCANF */
#else /* _UNICODE */
#ifdef _SNSCANF
int __cdecl _snscanf_s_l (
#else /* _SNSCANF */
int __cdecl _sscanf_s_l (
#endif /* _SNSCANF */
#endif /* _UNICODE */
REG2 const _TCHAR *string,
#ifdef _SNSCANF
size_t count,
#endif /* _SNSCANF */
const _TCHAR *format,
_locale_t plocinfo,
...
)
{
va_list arglist;
va_start(arglist, plocinfo);
#ifdef _SNSCANF
return vscan_fn(_tinput_s_l, string, count, format, plocinfo, arglist);
#else /* _SNSCANF */
return vscan_fn(_tinput_s_l, string, format, plocinfo, arglist);
#endif /* _SNSCANF */
}
找不到源码按钮，