/***
*sscanf.c - read formatted data from string
*
*	Copyright (c) 1985-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines scanf() - reads formatted data from string
*
*Revision History:
*	09-02-83  RN	initial version
*	04-13-87  JCR	added const to declaration
*	06-24-87  JCR	(1) Made declaration conform to ANSI prototype and use
*			the va_ macros; (2) removed SS_NE_DS conditionals.
*	12-11-87  JCR	Added "_LOAD_DS" to declaration
*	06-13-88  JCR	Fake _iob entry is now static so that other routines can
*			assume _iob entries are in DGROUP.
*	06-06-89  JCR	386 mthread support -- threads share one locked iob.
*	08-18-89  GJF	Clean up, now specific to OS/2 2.0 (i.e., 386 flat
*			model). Also fixed indents.
*	02-16-90  GJF	Fixed copyright
*	03-19-90  GJF	Made calling type _CALLTYPE2, added #include
*			<cruntime.h> and removed #include <register.h>.
*	03-26-90  GJF	Added #include <string.h>.
*	07-23-90  SBM	Replaced <assertm.h> by <assert.h>
*	10-03-90  GJF	New-style function declarator.
*       02-18-93  SRW   Make FILE a local and remove lock usage.
*
*******************************************************************************/

#include <cruntime.h>
#include <stdio.h>
#include <assert.h>
#include <stdarg.h>
#include <string.h>
#include <internal.h>
#include <os2dll.h>

/***
*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 _CALLTYPE2 sscanf (
	REG2 const char *string,
	const char *format,
	...
	)
/*
 * 'S'tring 'SCAN', 'F'ormatted
 */
{
	va_list arglist;
        FILE str;
	REG1 FILE *infile = &str;
	REG2 int retval;

	va_start(arglist, format);

	assert(string != NULL);
	assert(format != NULL);

	infile->_flag = _IOREAD|_IOSTRG|_IOMYBUF;
	infile->_ptr = infile->_base = (char *) string;
	infile->_cnt = strlen(string);

	retval = (_input(infile,format,arglist));

	return(retval);
}
