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libg++-2.6.2.lha
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libg++-2.6.2
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libio
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iostream.cc
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C/C++ Source or Header
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1994-11-05
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18KB
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/* This is part of libio/iostream, providing -*- C++ -*- input/output.
Copyright (C) 1993 Free Software Foundation
This file is part of the GNU IO Library. This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
As a special exception, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
/* Written by Per Bothner (bothner@cygnus.com). */
#ifdef __GNUC__
#pragma implementation
#endif
#define _STREAM_COMPAT
#include <iostream.h>
#include "libioP.h"
#include <stdio.h> /* Needed for sprintf */
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include "floatio.h"
#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
//#define isspace(ch) ((ch)==' ' || (ch)=='\t' || (ch)=='\n')
istream::istream(streambuf *sb, ostream* tied)
{
init (sb, tied);
_gcount = 0;
}
int skip_ws(streambuf* sb)
{
int ch;
for (;;) {
ch = sb->sbumpc();
if (ch == EOF || !isspace(ch))
return ch;
}
}
istream& istream::get(char& c)
{
if (ipfx1()) {
int ch = _strbuf->sbumpc();
if (ch == EOF) {
set(ios::eofbit|ios::failbit);
_gcount = 0;
}
else {
c = (char)ch;
_gcount = 1;
}
}
else
_gcount = 0;
return *this;
}
int istream::peek()
{
if (!good())
return EOF;
if (_tie && rdbuf()->in_avail() == 0)
_tie->flush();
int ch = _strbuf->sgetc();
if (ch == EOF)
set(ios::eofbit);
return ch;
}
istream& istream::ignore(int n /* = 1 */, int delim /* = EOF */)
{
_gcount = 0;
if (ipfx1()) {
register streambuf* sb = _strbuf;
if (delim == EOF) {
_gcount = sb->ignore(n);
return *this;
}
for (;;) {
#if 0
if (n != MAXINT) // FIXME
#endif
if (--n < 0)
break;
int ch = sb->sbumpc();
if (ch == EOF) {
set(ios::eofbit|ios::failbit);
break;
}
_gcount++;
if (ch == delim)
break;
}
}
return *this;
}
istream& istream::read(char *s, int n)
{
if (ipfx1()) {
_gcount = _strbuf->sgetn(s, n);
if (_gcount != n)
set(ios::failbit|ios::eofbit);
}
else
_gcount = 0;
return *this;
}
istream& istream::seekg(streampos pos)
{
pos = _strbuf->sseekpos(pos, ios::in);
if (pos == streampos(EOF))
set(ios::badbit);
return *this;
}
istream& istream::seekg(streamoff off, _seek_dir dir)
{
streampos pos
= _IO_seekoff (_strbuf, off,
(_IO_seekflags)
((int)dir | _IO_seek_not_out | _IO_seek_pos_ignored));
if (pos == streampos(EOF))
set(ios::badbit);
return *this;
}
streampos istream::tellg()
{
#if 0
streampos pos = _strbuf->sseekoff(0, ios::cur, ios::in);
#else
streampos pos
= _IO_seekoff (_strbuf, 0,
(_IO_seekflags)(_IO_seek_cur | _IO_seek_not_out));
#endif
if (pos == streampos(EOF))
set(ios::badbit);
return pos;
}
istream& istream::operator>>(char& c)
{
if (ipfx0()) {
int ch = _strbuf->sbumpc();
if (ch == EOF)
set(ios::eofbit|ios::failbit);
else
c = (char)ch;
}
return *this;
}
istream& istream::operator>>(char* ptr)
{
register char *p = ptr;
int w = width(0);
if (ipfx0()) {
register streambuf* sb = _strbuf;
for (;;)
{
int ch = sb->sbumpc();
if (ch == EOF)
{
set(p == ptr ? (ios::eofbit|ios::failbit) : (ios::eofbit));
break;
}
else if (isspace(ch))
{
sb->sputbackc(ch);
break;
}
else if (w == 1)
{
set(ios::failbit);
sb->sputbackc(ch);
break;
}
else *p++ = ch;
w--;
}
}
*p = '\0';
return *this;
}
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
#define LONGEST long long
#else
#define LONGEST long
#endif
static int read_int(istream& stream, unsigned LONGEST& val, int& neg)
{
if (!stream.ipfx0())
return 0;
register streambuf* sb = stream.rdbuf();
int base = 10;
int ndigits = 0;
register int ch = skip_ws(sb);
if (ch == EOF)
goto eof_fail;
neg = 0;
if (ch == '+') {
ch = skip_ws(sb);
}
else if (ch == '-') {
neg = 1;
ch = skip_ws(sb);
}
if (ch == EOF) goto eof_fail;
if (!(stream.flags() & ios::basefield)) {
if (ch == '0') {
ch = sb->sbumpc();
if (ch == EOF) {
val = 0;
return 1;
}
if (ch == 'x' || ch == 'X') {
base = 16;
ch = sb->sbumpc();
if (ch == EOF) goto eof_fail;
}
else {
sb->sputbackc(ch);
base = 8;
ch = '0';
}
}
}
else if ((stream.flags() & ios::basefield) == ios::hex)
base = 16;
else if ((stream.flags() & ios::basefield) == ios::oct)
base = 8;
val = 0;
for (;;) {
if (ch == EOF)
break;
int digit;
if (ch >= '0' && ch <= '9')
digit = ch - '0';
else if (ch >= 'A' && ch <= 'F')
digit = ch - 'A' + 10;
else if (ch >= 'a' && ch <= 'f')
digit = ch - 'a' + 10;
else
digit = 999;
if (digit >= base) {
sb->sputbackc(ch);
if (ndigits == 0)
goto fail;
else
return 1;
}
ndigits++;
val = base * val + digit;
ch = sb->sbumpc();
}
return 1;
fail:
stream.set(ios::failbit);
return 0;
eof_fail:
stream.set(ios::failbit|ios::eofbit);
return 0;
}
#define READ_INT(TYPE) \
istream& istream::operator>>(TYPE& i)\
{\
unsigned LONGEST val; int neg;\
if (read_int(*this, val, neg)) {\
if (neg) val = -val;\
i = (TYPE)val;\
}\
return *this;\
}
READ_INT(short)
READ_INT(unsigned short)
READ_INT(int)
READ_INT(unsigned int)
READ_INT(long)
READ_INT(unsigned long)
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
READ_INT(long long)
READ_INT(unsigned long long)
#endif
#if _G_HAVE_BOOL
READ_INT(bool)
#endif
istream& istream::operator>>(long double& x)
{
if (ipfx0())
scan("%lg", &x);
return *this;
}
istream& istream::operator>>(double& x)
{
if (ipfx0())
scan("%lg", &x);
return *this;
}
istream& istream::operator>>(float& x)
{
if (ipfx0())
scan("%g", &x);
return *this;
}
istream& istream::operator>>(register streambuf* sbuf)
{
if (ipfx0()) {
register streambuf* inbuf = rdbuf();
// FIXME: Should optimize!
for (;;) {
register int ch = inbuf->sbumpc();
if (ch == EOF) {
set(ios::eofbit);
break;
}
if (sbuf->sputc(ch) == EOF) {
set(ios::failbit);
break;
}
}
}
return *this;
}
ostream& ostream::operator<<(char c)
{
if (opfx()) {
#if 1
// This is what the cfront implementation does.
if (_strbuf->sputc(c) == EOF)
goto failed;
#else
// This is what cfront documentation and current ANSI drafts say.
int w = width(0);
char fill_char = fill();
register int padding = w > 0 ? w - 1 : 0;
register streambuf *sb = _strbuf;
if (!(flags() & ios::left) && padding) // Default adjustment.
if (_IO_padn(sb, fill_char, padding) < padding)
goto failed;
if (sb->sputc(c) == EOF)
goto failed;
if (flags() & ios::left && padding) // Left adjustment.
if (_IO_padn(sb, fill_char, padding) < padding)
goto failed;
#endif
osfx();
}
return *this;
failed:
set(ios::badbit);
osfx();
return *this;
}
/* Write VAL on STREAM.
If SIGN<0, val is the absolute value of a negative number.
If SIGN>0, val is a signed non-negative number.
If SIGN==0, val is unsigned. */
static void write_int(ostream& stream, unsigned LONGEST val, int sign)
{
#define WRITE_BUF_SIZE (10 + sizeof(unsigned LONGEST) * 3)
char buf[WRITE_BUF_SIZE];
register char *buf_ptr = buf+WRITE_BUF_SIZE; // End of buf.
char