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/* do not edit automatically generated by mc from StrIO. */
/* StrIO.mod provides simple string input output routines.
Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 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 3, or (at your option)
any later version.
GNU Modula-2 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
# if !defined (PROC_D)
# define PROC_D
typedef void (*PROC_t) (void);
typedef struct { PROC_t proc; } PROC;
# endif
# if !defined (FALSE)
# define FALSE (1==0)
# endif
#include <string.h>
#include <limits.h>
#define _StrIO_H
#define _StrIO_C
# include "GASCII.h"
# include "GStdIO.h"
# include "Glibc.h"
static unsigned int IsATTY;
/*
WriteLn - writes a carriage return and a newline
character.
*/
extern "C" void StrIO_WriteLn (void);
/*
ReadString - reads a sequence of characters into a string.
Line editing accepts Del, Ctrl H, Ctrl W and
Ctrl U.
*/
extern "C" void StrIO_ReadString (char *a, unsigned int _a_high);
/*
WriteString - writes a string to the default output.
*/
extern "C" void StrIO_WriteString (const char *a_, unsigned int _a_high);
/*
Erase - writes a backspace, space and backspace to remove the
last character displayed.
*/
static void Erase (void);
/*
Echo - echos the character, ch, onto the output channel if IsATTY
is true.
*/
static void Echo (char ch);
/*
AlphaNum- returns true if character, ch, is an alphanumeric character.
*/
static unsigned int AlphaNum (char ch);
/*
Erase - writes a backspace, space and backspace to remove the
last character displayed.
*/
static void Erase (void)
{
Echo (ASCII_bs);
Echo (' ');
Echo (ASCII_bs);
}
/*
Echo - echos the character, ch, onto the output channel if IsATTY
is true.
*/
static void Echo (char ch)
{
if (IsATTY)
{
StdIO_Write (ch);
}
}
/*
AlphaNum- returns true if character, ch, is an alphanumeric character.
*/
static unsigned int AlphaNum (char ch)
{
return (((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z'))) || ((ch >= '0') && (ch <= '9'));
/* static analysis guarentees a RETURN statement will be used before here. */
__builtin_unreachable ();
}
/*
WriteLn - writes a carriage return and a newline
character.
*/
extern "C" void StrIO_WriteLn (void)
{
Echo (ASCII_cr);
StdIO_Write (ASCII_lf);
}
/*
ReadString - reads a sequence of characters into a string.
Line editing accepts Del, Ctrl H, Ctrl W and
Ctrl U.
*/
extern "C" void StrIO_ReadString (char *a, unsigned int _a_high)
{
unsigned int n;
unsigned int high;
char ch;
high = _a_high;
n = 0;
do {
StdIO_Read (&ch);
if ((ch == ASCII_del) || (ch == ASCII_bs))
{
if (n == 0)
{
StdIO_Write (ASCII_bel);
}
else
{
Erase ();
n -= 1;
}
}
else if (ch == ASCII_nak)
{
/* avoid dangling else. */
while (n > 0)
{
Erase ();
n -= 1;
}
}
else if (ch == ASCII_etb)
{
/* avoid dangling else. */
if (n == 0)
{
Echo (ASCII_bel);
}
else if (AlphaNum (a[n-1]))
{
/* avoid dangling else. */
do {
Erase ();
n -= 1;
} while (! ((n == 0) || (! (AlphaNum (a[n-1])))));
}
else
{
/* avoid dangling else. */
Erase ();
n -= 1;
}
}
else if (n <= high)
{
/* avoid dangling else. */
if ((ch == ASCII_cr) || (ch == ASCII_lf))
{
a[n] = ASCII_nul;
n += 1;
}
else if (ch == ASCII_ff)
{
/* avoid dangling else. */
a[0] = ch;
if (high > 0)
{
a[1] = ASCII_nul;
}
ch = ASCII_cr;
}
else if (ch >= ' ')
{
/* avoid dangling else. */
Echo (ch);
a[n] = ch;
n += 1;
}
else if (ch == ASCII_eof)
{
/* avoid dangling else. */
a[n] = ch;
n += 1;
ch = ASCII_cr;
if (n <= high)
{
a[n] = ASCII_nul;
}
}
}
else if (ch != ASCII_cr)
{
/* avoid dangling else. */
Echo (ASCII_bel);
}
} while (! ((ch == ASCII_cr) || (ch == ASCII_lf)));
}
/*
WriteString - writes a string to the default output.
*/
extern "C" void StrIO_WriteString (const char *a_, unsigned int _a_high)
{
unsigned int n;
unsigned int high;
char a[_a_high+1];
/* make a local copy of each unbounded array. */
memcpy (a, a_, _a_high+1);
high = _a_high;
n = 0;
while ((n <= high) && (a[n] != ASCII_nul))
{
StdIO_Write (a[n]);
n += 1;
}
}
extern "C" void _M2_StrIO_init (__attribute__((unused)) int argc,__attribute__((unused)) char *argv[],__attribute__((unused)) char *envp[])
{
/* IsATTY := isatty() */
IsATTY = FALSE;
}
extern "C" void _M2_StrIO_fini (__attribute__((unused)) int argc,__attribute__((unused)) char *argv[],__attribute__((unused)) char *envp[])
{
}
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