mirror of https://github.com/cc65/cc65.git
869 lines
27 KiB
C
869 lines
27 KiB
C
/*
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** _scanf.c
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**
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** (c) Copyright 2001-2005, Ullrich von Bassewitz <uz@cc65.org>
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** 2014-09-10, Greg King <greg.king5@verizon.net>
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**
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** This is the basic layer for all scanf-type functions. It should be
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** rewritten in assembly, at some time in the future. So, some of the code
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** is not as elegant as it could be.
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*/
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <setjmp.h>
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#include <limits.h>
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#include <errno.h>
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#include <ctype.h>
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/* _scanf() can give EOF to these functions. But, the macroes can't
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** understand it; so, they are removed.
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*/
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#undef isspace
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#undef isxdigit
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#include "_scanf.h"
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#pragma static-locals(on)
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/*****************************************************************************/
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/* SetJmp return codes */
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/*****************************************************************************/
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enum {
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RC_OK, /* setjmp() call */
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RC_NOCONV, /* No conversion possible */
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RC_EOF /* EOF reached */
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};
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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static const char* format; /* Copy of function argument */
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static const struct scanfdata* D_; /* Copy of function argument */
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static va_list ap; /* Copy of function argument */
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static jmp_buf JumpBuf; /* "Label" that is used for failures */
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static char F; /* Character from format string */
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static unsigned CharCount; /* Characters read so far */
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static int C; /* Character from input */
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static unsigned Width; /* Maximum field width */
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static long IntVal; /* Converted int value */
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static int Assignments; /* Number of assignments */
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static unsigned char IntBytes; /* Number of bytes-1 for int conversions */
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/* Flags */
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static bool Converted; /* Some object was converted */
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static bool Positive; /* Flag for positive value */
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static bool NoAssign; /* Suppress assignment */
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static bool Invert; /* Do we need to invert the charset? */
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static unsigned char CharSet[(1+UCHAR_MAX)/CHAR_BIT];
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static const unsigned char Bits[CHAR_BIT] = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
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};
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/* We need C to be 16 bits since we cannot check for EOF otherwise.
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** Unfortunately, this causes the code to be quite larger, even if for most
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** purposes, checking the low byte would be enough, since if C is EOF, the
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** low byte will not match any useful character anyway (at least for the
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** supported platforms - I know that this is not portable). So the following
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** macro is used to access just the low byte of C.
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*/
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#define CHAR(c) (*((unsigned char*)&(c)))
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/*****************************************************************************/
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/* Character sets */
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/*****************************************************************************/
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/* We don't want the optimizer to ruin our "perfect" ;-)
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** assembly code!
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*/
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#pragma optimize (push, off)
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static unsigned FindBit (void)
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/* Locate the character's bit in the charset array.
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** < .A - Argument character
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** > .X - Offset of the byte in the character-set mask
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** > .A - Bit-mask
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*/
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{
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asm ("pha");
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asm ("lsr a"); /* Divide by CHAR_BIT */
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asm ("lsr a");
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asm ("lsr a");
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asm ("tax"); /* Byte's offset */
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asm ("pla");
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asm ("and #%b", CHAR_BIT-1);
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asm ("tay"); /* Bit's offset */
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asm ("lda %v,y", Bits);
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return (unsigned) __AX__;
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}
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#pragma optimize (pop)
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static void __fastcall__ AddCharToSet (unsigned char /* C */)
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/* Set the given bit in the character set */
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{
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FindBit();
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asm ("ora %v,x", CharSet);
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asm ("sta %v,x", CharSet);
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}
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#pragma optimize (push, off)
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static unsigned char IsCharInSet (void)
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/* Check if the char. is part of the character set. */
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{
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/* Get the character from C. */
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asm ("lda #$00");
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asm ("ldx %v+1", C);
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asm ("bne L1"); /* EOF never is in the set */
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asm ("lda %v", C);
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FindBit();
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asm ("and %v,x", CharSet);
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asm ("L1:");
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asm ("ldx #$00");
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return (unsigned char) __AX__;
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}
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#pragma optimize (pop)
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static void InvertCharSet (void)
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/* Invert the character set */
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{
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asm ("ldy #%b", sizeof (CharSet) - 1);
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asm ("L1:");
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asm ("lda %v,y", CharSet);
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asm ("eor #$FF");
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asm ("sta %v,y", CharSet);
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asm ("dey");
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asm ("bpl L1");
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}
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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static void PushBack (void)
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/* Push back the last (unused) character, provided it is not EOF. */
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{
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/* Get the character from C. */
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/* Only the high-byte needs to be checked for EOF. */
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asm ("ldx %v+1", C);
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asm ("bne %g", Done);
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asm ("lda %v", C);
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/* Put unget()'s first argument on the stack. */
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asm ("jsr pushax");
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/* Copy D into the zero-page. */
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__AX__ = (unsigned) D_;
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asm ("sta ptr1");
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asm ("stx ptr1+1");
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/* Copy the unget vector to jmpvec. */
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asm ("ldy #%b", offsetof (struct scanfdata, unget));
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asm ("lda (ptr1),y");
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asm ("sta jmpvec+1");
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asm ("iny");
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asm ("lda (ptr1),y");
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asm ("sta jmpvec+2");
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/* Load D->data into __AX__. */
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asm ("ldy #%b", offsetof (struct scanfdata, data) + 1);
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asm ("lda (ptr1),y");
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asm ("tax");
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asm ("dey");
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asm ("lda (ptr1),y");
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/* Call the unget routine. */
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asm ("jsr jmpvec");
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/* Take back that character's count. */
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asm ("lda %v", CharCount);
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asm ("bne %g", Yank);
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asm ("dec %v+1", CharCount);
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Yank:
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asm ("dec %v", CharCount);
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Done:
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;
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}
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static void ReadChar (void)
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/* Get an input character, count characters */
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{
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/* Move D to ptr1 */
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asm ("lda %v", D_);
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asm ("ldx %v+1", D_);
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asm ("sta ptr1");
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asm ("stx ptr1+1");
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/* Copy the get vector to jmpvec */
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asm ("ldy #%b", offsetof (struct scanfdata, get));
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asm ("lda (ptr1),y");
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asm ("sta jmpvec+1");
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asm ("iny");
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asm ("lda (ptr1),y");
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asm ("sta jmpvec+2");
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/* Load D->data into __AX__ */
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asm ("ldy #%b", offsetof (struct scanfdata, data) + 1);
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asm ("lda (ptr1),y");
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asm ("tax");
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asm ("dey");
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asm ("lda (ptr1),y");
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/* Call the get routine */
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asm ("jsr jmpvec");
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/* Assign the result to C */
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asm ("sta %v", C);
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asm ("stx %v+1", C);
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/* If C is EOF, don't bump the character counter.
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** Only the high-byte needs to be checked.
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*/
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asm ("inx");
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asm ("beq %g", Done);
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/* Must bump CharCount. */
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asm ("inc %v", CharCount);
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asm ("bne %g", Done);
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asm ("inc %v+1", CharCount);
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Done:
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;
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}
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#pragma optimize (push, off)
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static void __fastcall__ Error (unsigned char /* Code */)
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/* Does a longjmp using the given code */
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{
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asm ("pha");
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__AX__ = (unsigned) JumpBuf;
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asm ("jsr pushax");
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asm ("pla");
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asm ("ldx #>$0000");
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asm ("jmp %v", longjmp);
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}
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#pragma optimize (pop)
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static void CheckEnd (void)
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/* Stop a scan if it prematurely reaches the end of a string or a file. */
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{
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/* Only the high-byte needs to be checked for EOF. */
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asm ("ldx %v+1", C);
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asm ("beq %g", Done);
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Error (RC_EOF);
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Done:
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;
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}
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static void SkipWhite (void)
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/* Skip white space in the input and return the first non white character */
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{
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while ((bool) isspace (C)) {
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ReadChar ();
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}
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}
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#pragma optimize (push, off)
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static void ReadSign (void)
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/* Read an optional sign and skip it. Store 1 in Positive if the value is
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** positive, store 0 otherwise.
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*/
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{
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/* We can ignore the high byte of C here, since if it is EOF, the lower
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** byte won't match anyway.
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*/
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asm ("lda %v", C);
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asm ("cmp #'-'");
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asm ("bne %g", NotNeg);
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/* Negative value */
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asm ("sta %v", Converted);
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asm ("jsr %v", ReadChar);
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asm ("lda #$00"); /* Flag as negative */
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asm ("beq %g", Store);
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/* Positive value */
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NotNeg:
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asm ("cmp #'+'");
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asm ("bne %g", Pos);
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asm ("sta %v", Converted);
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asm ("jsr %v", ReadChar); /* Skip the + sign */
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Pos:
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asm ("lda #$01"); /* Flag as positive */
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Store:
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asm ("sta %v", Positive);
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}
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#pragma optimize (pop)
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static unsigned char __fastcall__ HexVal (char C)
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/* Convert a digit to a value */
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{
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return (bool) isdigit (C) ?
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C - '0' :
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(char) tolower ((int) C) - ('a' - 10);
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}
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static void __fastcall__ ReadInt (unsigned char Base)
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/* Read an integer, and store it into IntVal. */
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{
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unsigned char Val, CharCount = 0;
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/* Read the integer value */
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IntVal = 0L;
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while ((bool) isxdigit (C) && ++Width != 0
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&& (Val = HexVal ((char) C)) < Base) {
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++CharCount;
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IntVal = IntVal * (long) Base + (long) Val;
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ReadChar ();
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}
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/* If we didn't convert anything, it's a failure. */
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if (CharCount == 0) {
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Error (RC_NOCONV);
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}
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/* Another conversion */
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Converted = true;
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}
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static void AssignInt (void)
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/* Assign the integer value in Val to the next argument. The function makes
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** several non-portable assumptions, to reduce code size:
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** - signed and unsigned types have the same representation.
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** - short and int have the same representation.
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** - all pointer types have the same representation.
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*/
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{
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if (NoAssign == false) {
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/* Get the next argument pointer */
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__AX__ = (unsigned) va_arg (ap, void*);
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/* Put the argument pointer into the zero-page. */
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asm ("sta ptr1");
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asm ("stx ptr1+1");
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/* Get the number of bytes-1 to copy */
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asm ("ldy %v", IntBytes);
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/* Assign the integer value */
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Loop: asm ("lda %v,y", IntVal);
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asm ("sta (ptr1),y");
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asm ("dey");
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asm ("bpl %g", Loop);
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/* Another assignment */
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asm ("inc %v", Assignments);
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asm ("bne %g", Done);
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asm ("inc %v+1", Assignments);
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Done: ;
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}
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}
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static void __fastcall__ ScanInt (unsigned char Base)
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/* Scan an integer including white space, sign and optional base spec,
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** and store it into IntVal.
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*/
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{
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/* Skip whitespace */
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SkipWhite ();
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/* Read an optional sign */
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ReadSign ();
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/* If Base is unknown (zero), figure it out */
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if (Base == 0) {
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if (CHAR (C) == '0') {
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ReadChar ();
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switch (CHAR (C)) {
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case 'x':
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case 'X':
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Base = 16;
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Converted = true;
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ReadChar ();
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break;
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default:
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Base = 8;
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/* Restart at the beginning of the number because it might
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** be only a single zero digit (which already was read).
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*/
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PushBack ();
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C = '0';
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}
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} else {
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Base = 10;
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}
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}
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/* Read the integer value */
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ReadInt (Base);
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/* Apply the sign */
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if (Positive == false) {
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IntVal = -IntVal;
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}
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/* Assign the value to the next argument unless suppressed */
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AssignInt ();
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}
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static char GetFormat (void)
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/* Pick up the next character from the format string. */
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{
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/* return (F = *format++); */
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__AX__ = (unsigned) format;
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asm ("sta regsave");
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asm ("stx regsave+1");
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++format;
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asm ("ldy #0");
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asm ("lda (regsave),y");
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asm ("ldx #>$0000");
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return (F = (char) __AX__);
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}
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int __fastcall__ _scanf (const struct scanfdata* D,
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const char* format_, va_list ap_)
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/* This is the routine used to do the actual work. It is called from several
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** types of wrappers to implement the actual ISO xxscanf functions.
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*/
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{
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register char* S;
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bool HaveWidth; /* True if a width was given */
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bool Match; /* True if a character-set has any matches */
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char Start; /* Walks over a range */
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/* Place copies of the arguments into global variables. This is not very
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** nice, but on a 6502 platform it gives better code, since the values
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** do not have to be passed as parameters.
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*/
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D_ = D;
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format = format_;
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ap = ap_;
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/* Initialize variables */
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Converted = false;
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Assignments = 0;
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CharCount = 0;
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/* Set up the jump "label". CheckEnd() will use that label when EOF
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** is reached. ReadInt() will use it when number-conversion fails.
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*/
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if ((unsigned char) setjmp (JumpBuf) == RC_OK) {
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Again:
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/* Get the next input character */
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ReadChar ();
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/* Walk over the format string */
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while (GetFormat ()) {
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/* Check for a conversion */
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if (F != '%') {
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/* Check for a match */
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if ((bool) isspace ((int) F)) {
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|
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/* Special white space handling: Any whitespace in the
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** format string matches any amount of whitespace including
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** none(!). So this match will never fail.
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*/
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SkipWhite ();
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continue;
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}
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Percent:
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/* ### Note: The opposite test (C == F)
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** would be optimized into buggy code!
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*/
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if (C != (int) F) {
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/* A mismatch -- we will stop scanning the input,
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** and return the number of assigned conversions.
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*/
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goto NoConv;
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}
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/* A match -- get the next input character, and continue. */
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goto Again;
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} else {
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/* A conversion. Skip the percent sign. */
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/* 0. Check for %% */
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if (GetFormat () == '%') {
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goto Percent;
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}
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/* 1. Assignment suppression */
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NoAssign = (F == '*');
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if (NoAssign) {
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GetFormat ();
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}
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|
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/* 2. Maximum field width */
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Width = UINT_MAX;
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HaveWidth = (bool) isdigit (F);
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if (HaveWidth) {
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Width = 0;
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do {
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/* ### Non portable ### */
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Width = Width * 10 + (F & 0x0F);
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} while ((bool) isdigit (GetFormat ()));
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}
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if (Width == 0) {
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/* Invalid specification */
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/* Note: This method of leaving the function might seem
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** to be crude, but it optimizes very well because
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** the four exits can share this code.
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*/
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_seterrno (EINVAL);
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Assignments = EOF;
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PushBack ();
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return Assignments;
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}
|
|
/* Increment-and-test makes better code than test-and-decrement
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|
** does. So, change the width into a form that can be used in
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** that way.
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*/
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Width = ~Width;
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|
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/* 3. Length modifier */
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|
IntBytes = sizeof(int) - 1;
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switch (F) {
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case 'h':
|
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if (*format == 'h') {
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IntBytes = sizeof(char) - 1;
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++format;
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}
|
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GetFormat ();
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break;
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|
|
case 'l':
|
|
if (*format == 'l') {
|
|
/* Treat long long as long */
|
|
++format;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case 'j': /* intmax_t */
|
|
IntBytes = sizeof(long) - 1;
|
|
/* FALLTHROUGH */
|
|
|
|
case 'z': /* size_t */
|
|
case 't': /* ptrdiff_t */
|
|
/* Same size as int */
|
|
|
|
case 'L': /* long double - ignore this one */
|
|
GetFormat ();
|
|
}
|
|
|
|
/* 4. Conversion specifier */
|
|
switch (F) {
|
|
/* 'd' and 'u' conversions are actually the same, since the
|
|
** standard says that even the 'u' modifier allows an
|
|
** optionally signed integer.
|
|
*/
|
|
case 'd': /* Optionally signed decimal integer */
|
|
case 'u':
|
|
ScanInt (10);
|
|
break;
|
|
|
|
case 'i':
|
|
/* Optionally signed integer with a base */
|
|
ScanInt (0);
|
|
break;
|
|
|
|
case 'o':
|
|
/* Optionally signed octal integer */
|
|
ScanInt (8);
|
|
break;
|
|
|
|
case 'x':
|
|
case 'X':
|
|
/* Optionally signed hexadecimal integer */
|
|
ScanInt (16);
|
|
break;
|
|
|
|
case 's':
|
|
/* Whitespace-terminated string */
|
|
SkipWhite ();
|
|
CheckEnd (); /* Is it an input failure? */
|
|
Converted = true; /* No, conversion will succeed */
|
|
if (NoAssign == false) {
|
|
S = va_arg (ap, char*);
|
|
}
|
|
while (C != EOF
|
|
&& (bool) isspace (C) == false
|
|
&& ++Width) {
|
|
if (NoAssign == false) {
|
|
*S++ = C;
|
|
}
|
|
ReadChar ();
|
|
}
|
|
/* Terminate the string just read */
|
|
if (NoAssign == false) {
|
|
*S = '\0';
|
|
++Assignments;
|
|
}
|
|
break;
|
|
|
|
case 'c':
|
|
/* Fixed-length string, NOT zero-terminated */
|
|
if (HaveWidth == false) {
|
|
/* No width given, default is 1 */
|
|
Width = ~1u;
|
|
}
|
|
CheckEnd (); /* Is it an input failure? */
|
|
Converted = true; /* No, at least 1 char. available */
|
|
if (NoAssign == false) {
|
|
S = va_arg (ap, char*);
|
|
/* ## This loop is convenient for us, but it isn't
|
|
** standard C. The standard implies that a failure
|
|
** shouldn't put anything into the array argument.
|
|
*/
|
|
while (++Width) {
|
|
CheckEnd (); /* Is it a matching failure? */
|
|
*S++ = C;
|
|
ReadChar ();
|
|
}
|
|
++Assignments;
|
|
} else {
|
|
/* Just skip as many chars as given */
|
|
while (++Width) {
|
|
CheckEnd (); /* Is it a matching failure? */
|
|
ReadChar ();
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '[':
|
|
/* String using characters from a set */
|
|
/* Clear the set */
|
|
memset (CharSet, 0, sizeof (CharSet));
|
|
/* Skip the left-bracket, and test for inversion. */
|
|
Invert = (GetFormat () == '^');
|
|
if (Invert) {
|
|
GetFormat ();
|
|
}
|
|
if (F == ']') {
|
|
/* Empty sets aren't allowed; so, a right-bracket
|
|
** at the beginning must be a member of the set.
|
|
*/
|
|
AddCharToSet (F);
|
|
GetFormat ();
|
|
}
|
|
/* Read the characters that are part of the set */
|
|
while (F != '\0' && F != ']') {
|
|
if (*format == '-') { /* Look ahead at next char. */
|
|
/* A range. Get start and end, skip the '-' */
|
|
Start = F;
|
|
++format;
|
|
switch (GetFormat ()) {
|
|
case '\0':
|
|
case ']':
|
|
/* '-' as last char means: include '-' */
|
|
AddCharToSet (Start);
|
|
AddCharToSet ('-');
|
|
break;
|
|
default:
|
|
/* Include all characters
|
|
** that are in the range.
|
|
*/
|
|
while (1) {
|
|
AddCharToSet (Start);
|
|
if (Start == F) {
|
|
break;
|
|
}
|
|
++Start;
|
|
}
|
|
/* Get next char after range */
|
|
GetFormat ();
|
|
}
|
|
} else {
|
|
/* Just a character */
|
|
AddCharToSet (F);
|
|
/* Get next char */
|
|
GetFormat ();
|
|
}
|
|
}
|
|
/* Don't go beyond the end of the format string. */
|
|
/* (Maybe, this should mean an invalid specification.) */
|
|
if (F == '\0') {
|
|
--format;
|
|
}
|
|
|
|
/* Invert the set if requested */
|
|
if (Invert) {
|
|
InvertCharSet ();
|
|
}
|
|
|
|
/* We have the set in CharSet. Read characters and
|
|
** store them into a string while they are part of
|
|
** the set.
|
|
*/
|
|
Match = false;
|
|
if (NoAssign == false) {
|
|
S = va_arg (ap, char*);
|
|
}
|
|
while (IsCharInSet () && ++Width) {
|
|
if (NoAssign == false) {
|
|
*S++ = C;
|
|
}
|
|
Match = Converted = true;
|
|
ReadChar ();
|
|
}
|
|
/* At least one character must match the set. */
|
|
if (Match == false) {
|
|
goto NoConv;
|
|
}
|
|
if (NoAssign == false) {
|
|
*S = '\0';
|
|
++Assignments;
|
|
}
|
|
break;
|
|
|
|
case 'p':
|
|
/* Pointer, general format is 0xABCD.
|
|
** %hhp --> zero-page pointer
|
|
** %hp --> near pointer
|
|
** %lp --> far pointer
|
|
*/
|
|
SkipWhite ();
|
|
if (CHAR (C) != '0') {
|
|
goto NoConv;
|
|
}
|
|
Converted = true;
|
|
ReadChar ();
|
|
switch (CHAR (C)) {
|
|
case 'x':
|
|
case 'X':
|
|
break;
|
|
default:
|
|
goto NoConv;
|
|
}
|
|
ReadChar ();
|
|
ReadInt (16);
|
|
AssignInt ();
|
|
break;
|
|
|
|
case 'n':
|
|
/* Store the number of characters consumed so far
|
|
** (the read-ahead character hasn't been consumed).
|
|
*/
|
|
IntVal = (long) (CharCount - (C == EOF ? 0u : 1u));
|
|
AssignInt ();
|
|
/* Don't count it. */
|
|
if (NoAssign == false) {
|
|
--Assignments;
|
|
}
|
|
break;
|
|
|
|
case 'S':
|
|
case 'C':
|
|
/* Wide characters */
|
|
|
|
case 'a':
|
|
case 'A':
|
|
case 'e':
|
|
case 'E':
|
|
case 'f':
|
|
case 'F':
|
|
case 'g':
|
|
case 'G':
|
|
/* Optionally signed float */
|
|
|
|
/* Those 2 groups aren't implemented. */
|
|
_seterrno (ENOSYS);
|
|
Assignments = EOF;
|
|
PushBack ();
|
|
return Assignments;
|
|
|
|
default:
|
|
/* Invalid specification */
|
|
_seterrno (EINVAL);
|
|
Assignments = EOF;
|
|
PushBack ();
|
|
return Assignments;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
NoConv:
|
|
|
|
/* Coming here means a failure. If that happens at EOF, with no
|
|
** conversion attempts, then it is considered an error; otherwise,
|
|
** the number of assignments is returned (the default behaviour).
|
|
*/
|
|
if (C == EOF && Converted == false) {
|
|
Assignments = EOF; /* Special case: error */
|
|
}
|
|
}
|
|
|
|
/* Put the read-ahead character back into the input stream. */
|
|
PushBack ();
|
|
|
|
/* Return the number of conversion-and-assignments. */
|
|
return Assignments;
|
|
}
|
|
|
|
|
|
|