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ubuntu-buildroot/output/build/host-gcc-initial-11.4.0/gcc/ada/cstreams.c

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/****************************************************************************
* *
* GNAT RUN-TIME COMPONENTS *
* *
* C S T R E A M S *
* *
* Auxiliary C functions for Interfaces.C.Streams *
* *
* Copyright (C) 1992-2020, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 3, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* As a special exception 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/>. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
* *
****************************************************************************/
/* Routines required for implementing routines in Interfaces.C.Streams. */
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#define _FILE_OFFSET_BITS 64
/* the define above will make off_t a 64bit type on GNU/Linux */
/* Tell Cygwin's <stdio.h> to expose fileno_unlocked() */
#if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE)
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef _AIX
/* needed to avoid conflicting declarations */
#include <unistd.h>
#include <sys/mman.h>
#endif
#ifdef __vxworks
#include "vxWorks.h"
#endif
#ifdef IN_RTS
#include <string.h>
#else
#include "config.h"
#include "system.h"
#endif
#include "adaint.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __linux__
/* Don't use macros on GNU/Linux since they cause incompatible changes between
glibc 2.0 and 2.1 */
#ifdef stderr
# undef stderr
#endif
#ifdef stdin
# undef stdin
#endif
#ifdef stdout
# undef stdout
#endif
#endif
/* Don't use macros versions of this functions on VxWorks since they cause
imcompatible changes in some VxWorks versions */
#ifdef __vxworks
#undef getchar
#undef putchar
#undef feof
#undef ferror
#undef fileno
#endif
/* The _IONBF value in MINGW32 stdio.h is wrong. */
#if defined (WINNT) || defined (_WINNT)
#if OLD_MINGW
#undef _IONBF
#define _IONBF 0004
#endif
#endif
int
__gnat_feof (FILE *stream)
{
return (feof (stream));
}
int
__gnat_ferror (FILE *stream)
{
return (ferror (stream));
}
int
__gnat_fileno (FILE *stream)
{
return (fileno (stream));
}
/* on some systems, the constants for seek are not defined, if so, then
provide the conventional definitions */
#ifndef SEEK_SET
#define SEEK_SET 0 /* Set file pointer to offset */
#define SEEK_CUR 1 /* Set file pointer to its current value plus offset */
#define SEEK_END 2 /* Set file pointer to the size of the file plus offset */
#endif
/* if L_tmpnam is not set, use a large number that should be safe */
#ifndef L_tmpnam
#define L_tmpnam 256
#endif
int __gnat_constant_eof = EOF;
int __gnat_constant_iofbf = _IOFBF;
int __gnat_constant_iolbf = _IOLBF;
int __gnat_constant_ionbf = _IONBF;
int __gnat_constant_l_tmpnam = L_tmpnam;
int __gnat_constant_seek_cur = SEEK_CUR;
int __gnat_constant_seek_end = SEEK_END;
int __gnat_constant_seek_set = SEEK_SET;
FILE *
__gnat_constant_stderr (void)
{
return stderr;
}
FILE *
__gnat_constant_stdin (void)
{
return stdin;
}
FILE *
__gnat_constant_stdout (void)
{
return stdout;
}
char *
__gnat_full_name (char *nam, char *buffer)
{
#ifdef RTSS
/* RTSS applications have no current-directory notion, so RTSS file I/O
requests must use fully qualified path names, such as:
c:\temp\MyFile.txt (for a file system object)
\\.\MyDevice0 (for a device object)
*/
if (nam[1] == ':' || nam[0] == '\\')
strcpy (buffer, nam);
else
buffer[0] = '\0';
#elif defined (__MINGW32__)
/* If this is a device file return it as is;
under Windows NT a device file ends with ":". */
if (nam[strlen (nam) - 1] == ':')
strcpy (buffer, nam);
else
{
char *p;
_fullpath (buffer, nam, __gnat_max_path_len);
for (p = buffer; *p; p++)
if (*p == '/')
*p = '\\';
}
#elif defined (__FreeBSD__) || defined (__DragonFly__) || defined (__OpenBSD__)
/* Use realpath function which resolves links and references to . and ..
on those Unix systems that support it. Note that GNU/Linux provides it but
cannot handle more than 5 symbolic links in a full name, so we use the
getcwd approach instead. */
realpath (nam, buffer);
#elif defined (__QNX__)
int length;
if (__gnat_is_absolute_path (nam, strlen (nam)))
realpath (nam, buffer);
else
{
length = __gnat_max_path_len;
__gnat_get_current_dir (buffer, &length);
strncat (buffer, nam, __gnat_max_path_len - length - 1);
}
#elif defined (__vxworks)
/* On VxWorks systems, an absolute path can be represented (depending on
the host platform) as either /dir/file, or device:/dir/file, or
device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
to verify it. */
int length;
if (__gnat_is_absolute_path (nam, strlen (nam)))
strcpy (buffer, nam);
else
{
length = __gnat_max_path_len;
__gnat_get_current_dir (buffer, &length);
strncat (buffer, nam, __gnat_max_path_len - length - 1);
}
#else
if (nam[0] != '/')
{
char *p = getcwd (buffer, __gnat_max_path_len);
if (p == 0)
{
buffer[0] = '\0';
return 0;
}
/* If the name returned is an absolute path, it is safe to append '/'
to the path and concatenate the name of the file. */
if (buffer[0] == '/')
strcat (buffer, "/");
strcat (buffer, nam);
}
else
strcpy (buffer, nam);
#endif
return buffer;
}
#ifdef _WIN32
/* On Windows we want to use the fseek/fteel supporting large files. This
issue is due to the fact that a long on Win64 is still a 32 bits value */
__int64
__gnat_ftell64 (FILE *stream)
{
return _ftelli64 (stream);
}
int
__gnat_fseek64 (FILE *stream, __int64 offset, int origin)
{
return _fseeki64 (stream, offset, origin);
}
#elif defined (__linux__) || defined (__sun__) || defined (__FreeBSD__) \
|| defined (__APPLE__)
/* section for platforms having ftello/fseeko */
__int64
__gnat_ftell64 (FILE *stream)
{
return (__int64)ftello (stream);
}
int
__gnat_fseek64 (FILE *stream, __int64 offset, int origin)
{
/* make sure that the offset is not bigger than the OS off_t, if so return
with error as this mean that we are trying to handle files larger than
2Gb on a patform not supporting it. */
if ((off_t)offset == offset)
return fseeko (stream, (off_t) offset, origin);
else
return -1;
}
#else
__int64
__gnat_ftell64 (FILE *stream)
{
return (__int64)ftell (stream);
}
int
__gnat_fseek64 (FILE *stream, __int64 offset, int origin)
{
/* make sure that the offset is not bigger than the OS off_t, if so return
with error as this mean that we are trying to handle files larger than
2Gb on a patform not supporting it. */
if ((off_t)offset == offset)
return fseek (stream, (off_t) offset, origin);
else
return -1;
}
#endif
/* Returns true if the path names a fifo (i.e. a named pipe). */
int
__gnat_is_fifo (const char* path)
{
/* Posix defines S_ISFIFO as a macro. If the macro doesn't exist, we return
false. */
#ifdef S_ISFIFO
struct stat buf;
const int status = stat(path, &buf);
if (status == 0)
return S_ISFIFO(buf.st_mode);
#endif
/* S_ISFIFO is not available, or stat got an error (probably
file not found). */
return 0;
}
#ifdef __cplusplus
}
#endif
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