153 lines
5 KiB
C
153 lines
5 KiB
C
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/***
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*sscanf.c - read formatted data from string
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines scanf() - reads formatted data from string
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*
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*Revision History:
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* 09-02-83 RN initial version
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* 04-13-87 JCR added const to declaration
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* 06-24-87 JCR (1) Made declaration conform to ANSI prototype and use
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* the va_ macros; (2) removed SS_NE_DS conditionals.
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 06-13-88 JCR Fake _iob entry is now static so that other routines can
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* assume _iob entries are in DGROUP.
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* 06-06-89 JCR 386 mthread support -- threads share one locked iob.
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* 08-18-89 GJF Clean up, now specific to OS/2 2.0 (i.e., 386 flat
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* model). Also fixed indents.
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* 02-16-90 GJF Fixed copyright
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* 03-19-90 GJF Made calling type _CALLTYPE2, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 03-26-90 GJF Added #include <string.h>.
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* 07-23-90 SBM Replaced <assertm.h> by <assert.h>
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* 10-03-90 GJF New-style function declarator.
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* 02-18-93 SRW Make FILE a local and remove lock usage.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 02-06-94 CFW assert -> _ASSERTE.
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* 01-06-99 GJF Changes for 64-bit size_t.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <dbgint.h>
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#include <stdarg.h>
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#include <string.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <tchar.h>
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/***
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*int sscanf(string, format, ...) - read formatted data from string
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*
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*Purpose:
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* Reads formatted data from string into arguments. _input does the real
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* work here. Sets up a FILE so file i/o operations can be used, makes
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* string look like a huge buffer to it, but _filbuf will refuse to refill
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* it if it is exhausted.
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*
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* Allocate the 'fake' _iob[] entryit statically instead of on
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* the stack so that other routines can assume that _iob[] entries are in
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* are in DGROUP and, thus, are near.
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*
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* Multi-thread: (1) Since there is no stream, this routine must never try
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* to get the stream lock (i.e., there is no stream lock either). (2)
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* Also, since there is only one staticly allocated 'fake' iob, we must
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* lock/unlock to prevent collisions.
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*
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*Entry:
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* char *string - string to read data from
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* char *format - format string
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* followed by list of pointers to storage for the data read. The number
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* and type are controlled by the format string.
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*
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*Exit:
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* returns number of fields read and assigned
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*
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*Exceptions:
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*
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*******************************************************************************/
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/***
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*int snscanf(string, size, format, ...) - read formatted data from string of
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* given length
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*
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*Purpose:
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* Reads formatted data from string into arguments. _input does the real
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* work here. Sets up a FILE so file i/o operations can be used, makes
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* string look like a huge buffer to it, but _filbuf will refuse to refill
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* it if it is exhausted.
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*
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* Allocate the 'fake' _iob[] entryit statically instead of on
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* the stack so that other routines can assume that _iob[] entries are in
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* are in DGROUP and, thus, are near.
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*
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* Multi-thread: (1) Since there is no stream, this routine must never try
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* to get the stream lock (i.e., there is no stream lock either). (2)
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* Also, since there is only one staticly allocated 'fake' iob, we must
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* lock/unlock to prevent collisions.
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*
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*Entry:
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* char *string - string to read data from
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* size_t count - length of string
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* char *format - format string
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* followed by list of pointers to storage for the data read. The number
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* and type are controlled by the format string.
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*
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*Exit:
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* returns number of fields read and assigned
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _UNICODE
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#ifdef _SNSCANF
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int __cdecl _snwscanf (
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#else
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int __cdecl swscanf (
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#endif
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#else
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#ifdef _SNSCANF
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int __cdecl _snscanf (
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#else
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int __cdecl sscanf (
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#endif
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#endif
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REG2 const _TCHAR *string,
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#ifdef _SNSCANF
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size_t count,
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#endif
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const _TCHAR *format,
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...
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)
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/*
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* 'S'tring 'SCAN', 'F'ormatted
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*/
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{
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va_list arglist;
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FILE str;
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REG1 FILE *infile = &str;
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REG2 int retval;
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va_start(arglist, format);
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_ASSERTE(string != NULL);
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_ASSERTE(format != NULL);
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infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
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infile->_ptr = infile->_base = (char *) string;
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#ifdef _SNSCANF
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infile->_cnt = (int)count*sizeof(_TCHAR);
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#else
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infile->_cnt = ((int)_tcslen(string))*sizeof(_TCHAR);
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#endif
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#ifdef _UNICODE
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retval = (_winput(infile,format,arglist));
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#else
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retval = (_input(infile,format,arglist));
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#endif
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return(retval);
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}
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