/* gawkmisc.c --- miscellaneous gawk routines that are OS specific.
Copyright (C) 1986, 1988, 1989, 1991 - 1998, 2001 - 2004, 2011
the Free Software Foundation, Inc.
This program 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 program 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 this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifdef __CYGWIN__
#include <stdio.h>
#include <windows.h>
#include <sys/cygwin.h>
#include <io.h>
#endif
char quote = '\'';
char *defpath = DEFPATH;
char *deflibpath = DEFLIBPATH;
char envsep = ':';
#ifndef INVALID_HANDLE
/* FIXME: is this value for INVALID_HANDLE correct? */
#define INVALID_HANDLE -1
#endif
/* gawk_name --- pull out the "gawk" part from how the OS called us */
char *
gawk_name(const char *filespec)
{
char *p;
/* "path/name" -> "name" */
p = strrchr(filespec, '/');
return (p == NULL ? (char *) filespec : p + 1);
}
/* os_arg_fixup --- fixup the command line */
void
os_arg_fixup(int *argcp, char ***argvp)
{
/* no-op */
return;
}
/* os_devopen --- open special per-OS devices */
int
os_devopen(const char *name, int flag)
{
/* no-op */
return INVALID_HANDLE;
}
/* optimal_bufsize --- determine optimal buffer size */
/*
* Enhance this for debugging purposes, as follows:
*
* Always stat the file, stat buffer is used by higher-level code.
*
* if (AWKBUFSIZE == "exact")
* return the file size
* else if (AWKBUFSIZE == a number)
* always return that number
* else
* if the size is < default_blocksize
* return the size
* else
* return default_blocksize
* end if
* endif
*
* Hair comes in an effort to only deal with AWKBUFSIZE
* once, the first time this routine is called, instead of
* every time. Performance, dontyaknow.
*/
size_t
optimal_bufsize(int fd, struct stat *stb)
{
char *val;
static size_t env_val = 0;
static bool first = true;
static bool exact = false;
/* force all members to zero in case OS doesn't use all of them. */
memset(stb, '\0', sizeof(struct stat));
/* always stat, in case stb is used by higher level code. */
if (fstat(fd, stb) == -1)
fatal("can't stat fd %d (%s)", fd, strerror(errno));
if (first) {
first = false;
if ((val = getenv("AWKBUFSIZE")) != NULL) {
if (strcmp(val, "exact") == 0)
exact = true;
else if (isdigit((unsigned char) *val)) {
for (; *val && isdigit((unsigned char) *val); val++)
env_val = (env_val * 10) + *val - '0';
return env_val;
}
}
} else if (! exact && env_val > 0)
return env_val;
/* else
fall through */
/*
* System V.n, n < 4, doesn't have the file system block size in the
* stat structure. So we have to make some sort of reasonable
* guess. We use stdio's BUFSIZ, since that is what it was
* meant for in the first place.
*/
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
#define DEFBLKSIZE (stb->st_blksize > 0 ? stb->st_blksize : BUFSIZ)
#else
#define DEFBLKSIZE BUFSIZ
#endif
if (S_ISREG(stb->st_mode) /* regular file */
&& 0 < stb->st_size /* non-zero size */
&& (stb->st_size < DEFBLKSIZE /* small file */
|| exact)) /* or debugging */
return stb->st_size; /* use file size */
return DEFBLKSIZE;
}
/* ispath --- return true if path has directory components */
int
ispath(const char *file)
{
return (strchr(file, '/') != NULL);
}
/* isdirpunct --- return true if char is a directory separator */
int
isdirpunct(int c)
{
return (c == '/');
}
/* os_close_on_exec --- set close on exec flag, print warning if fails */
void
os_close_on_exec(int fd, const char *name, const char *what, const char *dir)
{
int curflags = 0;
if (fd <= 2) /* sanity */
return;
/*
* Per POSIX, use Read/Modify/Write - get the flags,
* add FD_CLOEXEC, set the flags back.
*/
if ((curflags = fcntl(fd, F_GETFD)) < 0) {
warning(_("%s %s `%s': could not get fd flags: (fcntl F_GETFD: %s)"),
what, dir, name, strerror(errno));
return;
}
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
curflags |= FD_CLOEXEC;
if (fcntl(fd, F_SETFD, curflags) < 0)
warning(_("%s %s `%s': could not set close-on-exec: (fcntl F_SETFD: %s)"),
what, dir, name, strerror(errno));
}
/* os_isdir --- is this an fd on a directory? */
#if ! defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
int
os_isdir(int fd)
{
struct stat sbuf;
return (fstat(fd, &sbuf) == 0 && S_ISDIR(sbuf.st_mode));
}
/* os_isreadable --- fd can be read from */
int
os_isreadable(const awk_input_buf_t *iobuf, bool *isdir)
{
*isdir = false;
if (iobuf->fd == INVALID_HANDLE)
return false;
switch (iobuf->sbuf.st_mode & S_IFMT) {
case S_IFREG:
case S_IFCHR: /* ttys, /dev/null, .. */
#ifdef S_IFSOCK
case S_IFSOCK:
#endif
#ifdef S_IFIFO
case S_IFIFO:
#endif
return true;
case S_IFDIR:
*isdir = true;
/* fall through */
default:
return false;
}
}
/* os_is_setuid --- true if running setuid root */
int
os_is_setuid()
{
long uid, euid;
uid = getuid();
euid = geteuid();
return (euid == 0 && euid != uid);
}
/* os_setbinmode --- set binary mode on file */
int
os_setbinmode(int fd, int mode)
{
#ifdef __CYGWIN__
setmode (fd, mode);
#endif
return 0;
}
/* os_restore_mode --- restore the original mode of the console device */
void
os_restore_mode(int fd)
{
/* no-op */
return;
}
/* os_isatty --- return true if fd is a tty */
int
os_isatty(int fd)
{
return isatty(fd);
}
/* files_are_same --- return true if files are identical */
int
files_are_same(char *path, SRCFILE *src)
{
struct stat st;
return (stat(path, & st) == 0
&& st.st_dev == src->sbuf.st_dev
&& st.st_ino == src->sbuf.st_ino);
}
void
init_sockets(void)
{
}