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23ce05f906
SPDX is an international standard for documenting software license requirements. Remove the existing headers and replace with a brief SPDX preamble. See: https://spdx.dev/use/specifications/ The script used to convert the files is added to "tools", and the file header templates in headers/ are updated. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
205 lines
4.3 KiB
C
205 lines
4.3 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Copyright 1996-2022 The NASM Authors - All Rights Reserved */
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#ifndef NASMLIB_FILE_H
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#define NASMLIB_FILE_H
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#include "compiler.h"
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#include "nasmlib.h"
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#include "error.h"
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#ifdef HAVE_IO_H
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# include <io.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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#ifndef R_OK
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# define R_OK 4 /* Classic Unix constant, same on Windows */
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#endif
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/* Can we adjust the file size without actually writing all the bytes? */
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#ifdef HAVE__CHSIZE_S
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# define os_ftruncate(fd,size) _chsize_s(fd,size)
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#elif defined(HAVE__CHSIZE)
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# define os_ftruncate(fd,size) _chsize(fd,size)
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#elif defined(HAVE_FTRUNCATE)
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# define os_ftruncate(fd,size) ftruncate(fd,size)
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#endif
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/*
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* On Windows, we want to use _wfopen(), as fopen() has a much smaller limit
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* on the path length that it supports. Furthermore, we want to prefix the
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* path name with \\?\ in order to let the Windows kernel know that
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* we are not limited to PATH_MAX characters. Thus, we wrap all the functions
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* which take filenames...
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*/
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#ifdef _WIN32
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# include <wchar.h>
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typedef wchar_t *os_filename;
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typedef wchar_t os_fopenflag;
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os_filename os_mangle_filename(const char *filename);
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static inline void os_free_filename(os_filename filename)
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{
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nasm_free(filename);
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}
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# define os_fopen _wfopen
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# define os_access _waccess
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/*
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* On Win32/64, we have to use the _wstati64() function. Note that
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* we can't use _wstat64() without depending on a needlessly new
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* version os MSVCRT.
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*/
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typedef struct _stati64 os_struct_stat;
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# define os_stat _wstati64
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# define os_fstat _fstati64
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/*
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* On Win32/64, freopen() and _wfreopen() fails when the mode string
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* is with the letter 'b' that represents to set binary mode. On
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* POSIX operating systems, the 'b' is ignored, without failure.
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*/
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#include <io.h>
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#include <fcntl.h>
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static inline void os_set_binary_mode(FILE *f) {
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int ret = _setmode(_fileno(f), _O_BINARY);
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if (ret == -1) {
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nasm_fatalf(ERR_NOFILE, "unable to open file: %s",
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strerror(errno));
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}
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}
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#else /* not _WIN32 */
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typedef const char *os_filename;
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typedef char os_fopenflag;
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static inline os_filename os_mangle_filename(const char *filename)
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{
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return filename;
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}
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static inline void os_free_filename(os_filename filename)
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{
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(void)filename; /* Nothing to do */
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}
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static inline void os_set_binary_mode(FILE *f) {
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(void)f;
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}
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# define os_fopen fopen
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#if defined(HAVE_FACCESSAT) && defined(AT_EACCESS)
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static inline int os_access(os_filename pathname, int mode)
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{
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return faccessat(AT_FDCWD, pathname, mode, AT_EACCESS);
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}
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# define os_access os_access
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#elif defined(HAVE_ACCESS)
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# define os_access access
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#endif
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#ifdef HAVE_STRUCT_STAT
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typedef struct stat os_struct_stat;
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# ifdef HAVE_STAT
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# define os_stat stat
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# endif
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# ifdef HAVE_FSTAT
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# define os_fstat fstat
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# endif
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#else
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struct dummy_struct_stat {
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int st_mode;
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int st_size;
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};
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typedef struct dummy_struct_stat os_struct_stat;
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#endif
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#endif /* Not _WIN32 */
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#ifdef S_ISREG
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/* all good */
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#elif defined(HAVE_S_ISREG)
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/* exists, but not a macro */
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# define S_ISREG S_ISREG
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#elif defined(S_IFMT) && defined(S_IFREG)
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# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
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#elif defined(_S_IFMT) && defined(_S_IFREG)
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# define S_ISREG(m) (((m) & _S_IFMT) == _S_IFREG)
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#endif
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#ifdef fileno
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/* all good */
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#elif defined(HAVE_FILENO)
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/* exists, but not a macro */
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# define fileno fileno
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#elif defined(_fileno) || defined(HAVE__FILENO)
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# define fileno _fileno
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#endif
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#ifndef S_ISREG
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# undef os_stat
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# undef os_fstat
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#endif
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/* Disable these functions if they don't support something we need */
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#ifndef fileno
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# undef os_fstat
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# undef os_ftruncate
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# undef HAVE_MMAP
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#endif
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/*
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* If we don't have functional versions of these functions,
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* stub them out so we don't need so many #ifndefs
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*/
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#ifndef os_stat
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static inline int os_stat(os_filename osfname, os_struct_stat *st)
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{
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(void)osfname;
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(void)st;
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return -1;
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}
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#endif
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#ifndef os_fstat
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static inline int os_fstat(int fd, os_struct_stat *st)
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{
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(void)fd;
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(void)st;
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return -1;
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}
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#endif
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#ifndef S_ISREG
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static inline bool S_ISREG(int m)
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{
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(void)m;
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return false;
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}
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#endif
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#endif /* NASMLIB_FILE_H */
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