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b1d4e1613b
standard version than before, and it does support the necessary functionality to support scanf functions for files. Added vfscanf, fscanf and vfscanf. git-svn-id: svn://svn.cc65.org/cc65/trunk@3301 b7a2c559-68d2-44c3-8de9-860c34a00d81
82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
/*
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* vsscanf.c
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*
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* (C) Copyright 2002 Ullrich von Bassewitz (uz@cc65.org)
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*
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*/
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#include <stdio.h>
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#include "_scanf.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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struct sscanfdata {
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const char* str; /* Pointer to input string */
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unsigned index; /* Read index */
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};
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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static int __fastcall__ get (struct sscanfdata* d)
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/* Read a character from the input string and return it */
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{
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char C;
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if (C = d->str[d->index]) {
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/* Increment index only if end not reached */
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++d->index;
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return C;
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} else {
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return EOF;
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}
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}
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static int __fastcall__ unget (int c, struct sscanfdata* d)
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/* Push back a character onto the input stream */
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{
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/* We do assume here that the _scanf routine will not push back anything
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* not read, so we can ignore c safely and won't check the index.
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*/
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--d->index;
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return c;
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}
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int __fastcall__ vsscanf (const char* str, const char* format, va_list ap)
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/* Standard C function */
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{
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struct sscanfdata sd;
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struct scanfdata d;
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/* Initialize the data structs. The sscanfdata struct will be passed back
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* to the get and unget functions by _scanf.
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*/
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d.get = (getfunc) get;
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d.unget = (ungetfunc) unget,
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d.data = &sd;
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sd.str = str;
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sd.index = 0;
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/* Call the internal function and return the result */
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return _scanf (&d, format, ap);
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}
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