/*

 * gawkmisc.vms --- miscellanious gawk routines that are OS specific.

 */

/* 

 * Copyright (C) 1986, 1988, 1989, 1991-1996, 2003, 2011, 2014

 * the Free Software Foundation, Inc.

 * 

 * This file is part of GAWK, the GNU implementation of the

 * AWK Progamming Language.

 * 

 * GAWK 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 of the License, or

 * (at your option) any later version.

 * 

 * GAWK 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

 */

#include <stdio.h>

#include <string.h>

#include <ctype.h>

#include <stdlib.h>

#include <descrip.h>

#include <dvidef.h>

#include <efndef.h>

#include <fscndef.h>

#include <stsdef.h>

#include <time.h>

#include <lnmdef.h>

#pragma member_alignment save

#pragma nomember_alignment longword

struct item_list_3 {

	unsigned short len;

	unsigned short code;

	void * bufadr;

	unsigned short * retlen;

};

struct filescan_itmlst_2 {

    unsigned short length;

    unsigned short itmcode;

    char * component;

};

#pragma member_alignment

int SYS$GETDVIW(

        unsigned long efn,

        unsigned short chan,

        const struct dsc$descriptor_s * devnam,

        const struct item_list_3 * itmlst,

        void * iosb,

        void (* astadr)(unsigned long),

        unsigned long astprm,

        void * nullarg);

int SYS$FILESCAN(

        const struct dsc$descriptor_s * srcstr,

        struct filescan_itmlst_2 * valuelist,

        unsigned long * fldflags,

        struct dsc$descriptor_s *auxout,

        unsigned short * retlen);

int   SYS$TRNLNM(

        const unsigned long * attr,

        const struct dsc$descriptor_s * table_dsc,

        struct dsc$descriptor_s * name_dsc,

        const unsigned char * acmode,

        const struct item_list_3 * item_list);

char quote = '\'';

char *defpath = DEFPATH;

char *deflibpath = DEFLIBPATH;

char envsep  = ',';

#define VMS_NAME_LEN 255

static char vms_name[VMS_NAME_LEN+1];

/* Take all the fun out of simply looking up a logical name */

static int sys_trnlnm

   (const char * logname,

    char * value,

    int value_len)

{

	const $DESCRIPTOR(table_dsc, "LNM$FILE_DEV");

	const unsigned long attr = LNM$M_CASE_BLIND;

	struct dsc$descriptor_s name_dsc;

	int status;

	unsigned short result;

	struct item_list_3 itlst[2];

	itlst[0].len = value_len;

	itlst[0].code = LNM$_STRING;

	itlst[0].bufadr = value;

	itlst[0].retlen = &result;

	itlst[1].len = 0;

	itlst[1].code = 0;

	name_dsc.dsc$w_length = strlen(logname);

	name_dsc.dsc$a_pointer = (char *)logname;

	name_dsc.dsc$b_dtype = DSC$K_DTYPE_T;

	name_dsc.dsc$b_class = DSC$K_CLASS_S;

	status = SYS$TRNLNM(&attr, &table_dsc, &name_dsc, 0, itlst);

	if ($VMS_STATUS_SUCCESS(status)) {

		/* Null terminate and return the string */

		value[result] = '\0';

	}

	return status;

}

/* gawk_name --- pull out the "gawk" part from how the OS called us */

/* You would not think that this should be a such a problem, but

 * VMS extended file specifications are tricky to parse, and we have

 * to tell the difference between a CRTL generated argv[0] and a

 * passed exec() argv[0] and handle both cases.

 */

char *

gawk_name(filespec)

const char *filespec;

{

	int status;

	int result;

	char * shell;

	int lcname = 0;

	/* If the path name starts with a /, then it is an absolute path

	 * that may have been generated by the CRTL instead of the command

	 * name.  If it is the device name between the slashes, then this

	 * was likely from the run command and needs to be fixed up.

	 * If the DECC$POSIX_COMPLIANT_PATHNAMES is set to 2, then it is

	 * the DISK$VOLUME that will be present, and it will still need to

	 * be fixed.

	 */

	result = 0;

	if (filespec[0] == '/') {

		char * nextslash;

		int length;

		struct item_list_3 itemlist[3];

		unsigned short dvi_iosb[4];

		char alldevnam[64];

		unsigned short alldevnam_len;

		struct dsc$descriptor_s devname_dsc;

		char diskvolnam[256];

		unsigned short diskvolnam_len;

		 /* Get some information about the disk */

		/*--------------------------------------*/

		itemlist[0].len = (sizeof alldevnam) - 1;

		itemlist[0].code = DVI$_ALLDEVNAM;

		itemlist[0].bufadr = alldevnam;

		itemlist[0].retlen = &alldevnam_len;

		itemlist[1].len = (sizeof diskvolnam) - 1 - 5;

		itemlist[1].code = DVI$_VOLNAM;

		itemlist[1].bufadr = &diskvolnam[5];

		itemlist[1].retlen = &diskvolnam_len;

		itemlist[2].len = 0;

		itemlist[2].code = 0;

		/* Add the prefix for the volume name. */

		/* SYS$GETDVI will append the volume name to this */

		strcpy(diskvolnam,"DISK$");

		nextslash = strchr(&filespec[1], '/');

		if (nextslash != NULL) {

			length = nextslash - filespec - 1;

			/* DECC requires a cast here */

			devname_dsc.dsc$a_pointer = (char *)&filespec[1];

			devname_dsc.dsc$w_length = length;

			devname_dsc.dsc$b_dtype = DSC$K_DTYPE_T;

			devname_dsc.dsc$b_class = DSC$K_CLASS_S;

			status = SYS$GETDVIW(

				EFN$C_ENF,

				0,

				&devname_dsc,

				itemlist,

				dvi_iosb,

				NULL, 0, 0);

			if (!$VMS_STATUS_SUCCESS(status)) {

				/* If the sys$getdviw fails, then this path

				 * was passed by an exec() program and not

				 * from DCL, so do nothing.

				 * An example is "/tmp/program" where tmp:

				 * does not exist

				 */

				result = 0;

			} else if (!$VMS_STATUS_SUCCESS(dvi_iosb[0])) {

				result = 0;

			} else {

				char * devnam;

				int devnam_len;

				char argv_dev[64];

				/* Null terminate the returned alldevnam */

				alldevnam[alldevnam_len] = 0;

				devnam = alldevnam;

				devnam_len = alldevnam_len;

				/* Need to skip past any leading underscore */

				if (devnam[0] == '_') {

					devnam++;

					devnam_len--;

				}

				/* And remove the trailing colon */

				if (devnam[devnam_len - 1] == ':') {

					devnam_len--;

					devnam[devnam_len] = 0;

				}

				/* Null terminate the returned volnam */

				diskvolnam_len += 5;

				diskvolnam[diskvolnam_len] = 0;

				/* Check first for normal CRTL behavior */

				if (devnam_len == length) {

					strncpy(vms_name, &filespec[1], length);

				vms_name[length] = 0;

				result = (strcasecmp(devnam, vms_name) == 0);

				}

				/* If we have not got a match check for

				 * POSIX Compliant behavior.  To be more

				 * accurate, we could also check to see

				 * if that feature is active.

				 */

				if ((result == 0) &&

				    (diskvolnam_len == length)) {

					int cmp;

					strncpy(vms_name, &filespec[1], length);

					vms_name[length] = 0;

					cmp = strcasecmp(diskvolnam, vms_name);

					result = (cmp == 0);

				}

			}

		}

	} else {

		/* The path did not start with a slash, so it could be VMS

		 * format.  If it is vms format, it has a volume/device in

		 * it as it must be an absolute path

		 */

		struct dsc$descriptor_s path_desc;

		int status;

		unsigned long field_flags;

		struct filescan_itmlst_2 item_list[5];

		char * volume;

		char * name;

		int name_len;

		char * ext;

		/* DECC requires a cast here */

		path_desc.dsc$a_pointer = (char *)filespec;

		path_desc.dsc$w_length = strlen(filespec);

		path_desc.dsc$b_dtype = DSC$K_DTYPE_T;

		path_desc.dsc$b_class = DSC$K_CLASS_S;

		/* Don't actually need to initialize anything buf itmcode */

		/* I just do not like uninitialized input values */

		/* Sanity check, this must be the same length as input */

		item_list[0].itmcode = FSCN$_FILESPEC;

		item_list[0].length = 0;

		item_list[0].component = NULL;

		/* If the device is present, then it if a VMS spec */

		item_list[1].itmcode = FSCN$_DEVICE;

		item_list[1].length = 0;

		item_list[1].component = NULL;

		/* we need the program name and type */

		item_list[2].itmcode = FSCN$_NAME;

		item_list[2].length = 0;

		item_list[2].component = NULL;

		item_list[3].itmcode = FSCN$_TYPE;

		item_list[3].length = 0;

		item_list[3].component = NULL;

		/* End the list */

		item_list[4].itmcode = 0;

		item_list[4].length = 0;

		item_list[4].component = NULL;

		status = SYS$FILESCAN(

		    (const struct dsc$descriptor_s *)&path_desc,

		     item_list, &field_flags, NULL, NULL);

		if ($VMS_STATUS_SUCCESS(status) &&

		   (item_list[0].length == path_desc.dsc$w_length) &&

		   (item_list[1].length != 0)) {

			char * dollar;

			int keep_ext;

			int i;

			/* We need the filescan to be successful,

			 * same length as input, and a volume to be present.

			 *

			 * We will assume that we only get to this path on

			 * a version of VMS that does not support the EFS

			 * character set.

			 *

			 * There may be a xxx$ prefix on the image name.

			 * Linux  programs do not handle that well, so

			 * strip the prefix.

			 */

			name = item_list[2].component;

			name_len = item_list[2].length;

			dollar = strrchr(name, '$');

			if (dollar != NULL) {

				dollar++;

				name_len = name_len - (dollar - name);

				name = dollar;

			}

			strncpy(vms_name, name, name_len);

			vms_name[name_len] = 0;

			result = 1;

			/* We only keep the extension if it is not ".exe" */

			keep_ext = 0;

			ext = item_list[3].component;

			if (item_list[3].length != 1) {

				if (item_list[3].length != 4) {

					keep_ext = 1;

				} else {

					int x;

					x = strncmp(ext, ".exe", 4);

					if (x != 0) {

						keep_ext = 1;

					}

				}

			}

			if (keep_ext == 1) {

				strncpy(&vms_name[name_len],

					ext, item_list[3].length);

			}

		}

	}

	if (result) {

		char * lastslash;

		char * dollar;

		char * dotexe;

		char * lastdot;

		char * extension;

		/* This means it is probably the name from a DCL command

		 * Find the last slash which separates the file from the

		 * path.

		 */

		lastslash = strrchr(filespec, '/');

		if (lastslash != NULL) {

			int i;

			lastslash++;

			/* There may be a xxx$ prefix on the image name. */

			/* Linux programs do not handle that well, so    */

			/* strip the prefix */

			dollar = strrchr(lastslash, '$');

			if (dollar != NULL) {

				dollar++;

				lastslash = dollar;

			}

			strcpy(vms_name, lastslash);

			/* In UNIX mode + EFS character set, there should

			 * not be a version present, as it is not possible

			 * when parsing to tell if it is a version or part

			 * of the UNIX filename as UNIX programs use numeric

			 * extensions for many reasons.

			 */

			lastdot = strrchr(vms_name, '.');

			if (lastdot != NULL) {

				int i;

				i = 1;

				while (isdigit(lastdot[i])) {

					i++;

				}

				if (lastdot[i] == 0) {

					*lastdot = 0;

				}

			}

			/* Find the .exe on the name (case insenstive)

			 * and toss it

			 */

			dotexe = strrchr(vms_name, '.');

			if (dotexe != NULL) {

				if ((dotexe[1] == 'e' || dotexe[1] == 'E') &&

				    (dotexe[2] == 'x' || dotexe[2] == 'X') &&

				    (dotexe[3] == 'e' || dotexe[3] == 'E') &&

				    (dotexe[4] == 0)) {

					*dotexe = 0;

				} else {

					/* Also need to handle a null

					 * extension because of a CRTL bug.

					 */

					if (dotexe[1] == 0) {

						*dotexe = 0;

					}

				}

			}

		}

	} else {

		/* No changes needed */

		strncpy(vms_name, filespec, VMS_NAME_LEN);

		vms_name[VMS_NAME_LEN] = 0;

	}

	/*

	 * The above fixes up the name, but for the DCL shell

	 * may leave it in upper case, which messes up the self tests.

	 * force it to lower case here.

	 */

	shell = getenv("SHELL");

	if (shell != NULL) {

		if (strcmp(shell, "DCL") == 0) {

			lcname = 1;

		}

	} else {

		lcname = 1;

	}

	if (lcname == 1) {

		int i = 0;

		while (vms_name[i] != 0) {

			vms_name[i] = tolower(vms_name[i]);

			i++;

		}

	}

	return vms_name;

}

/* os_arg_fixup --- fixup the command line */

void

os_arg_fixup(argcp, argvp)

int *argcp;

char ***argvp;

{

	char *tz_rule;

	int status;

	(void) vms_arg_fixup(argcp, argvp);

	/* Fix up the time zone */

	/* For some reason it gets trashed */

	tz_rule = malloc(1024);

	status = sys_trnlnm("TZ", tz_rule, 1024);

	if ($VMS_STATUS_SUCCESS(status)) {

		setenv("TZ", tz_rule, 1);

	} else {

		status = sys_trnlnm("SYS$TIMEZONE_RULE", tz_rule, 1024);

		if ($VMS_STATUS_SUCCESS(status)) {

			setenv("TZ", tz_rule, 1);

		}

	}

	free(tz_rule);

}

/* os_devopen --- open special per-OS devices */

int

os_devopen(name, flag)

const char *name;

int flag;

{

	return vms_devopen(name, flag);

}

/* optimal_bufsize --- determine optimal buffer size */

size_t

optimal_bufsize(fd, stb)

int fd;

struct stat *stb;

{

	/* force all members to zero in case OS doesn't use all of them. */

	memset(stb, '\0', sizeof(struct stat));

	/*

	 * These values correspond with the RMS multi-block count used by

	 * vms_open() in vms/vms_misc.c.

	 */

	if (isatty(fd) > 0)

		return BUFSIZ;

	else if (fstat(fd, stb) < 0)

		return 8*512;	/* conservative in case of DECnet access */

	else

		return 32*512;

}

/* ispath --- return true if path has directory components */

int

ispath(file)

const char *file;

{

	for (; *file; file++) {

		switch (*file) {

		case ':':

		case ']':

		case '>':

		case '/':

			return 1;

		}

	}

	return 0;

}

/* isdirpunct --- return true if char is a directory separator */

int

isdirpunct(c)

int c;

{

	return (strchr(":]>/", c) != NULL);

}

/* os_close_on_exec --- set close on exec flag, print warning if fails */

void

os_close_on_exec(fd, name, what, dir)

int fd;

const char *name, *what, *dir;

{

	/* no-op */

}

/* 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(fd)

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;

	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()

{

	return 0;

}

/* os_setbinmode --- set binary mode on file */

int

os_setbinmode (fd, mode)

int fd, mode;

{

	return 0;

}

/* os_restore_mode --- restore the original mode of the console device */

void

os_restore_mode (fd)

int fd;

{

	/* no-op */

	return;

}

/* files_are_same --- deal with VMS struct stat */

int

files_are_same(char *newfile, SRCFILE *oldfile)

{

	struct stat st, *f1, *f2;

	f1 = &st;

	if (stat(newfile, f1) != 0) return 0;

	f2 = &oldfile->sbuf;

		/* compare device string */

#ifdef _USE_STD_STAT

	return (f1->st_dev == f2->st_dev

		/* and 48-bit file id cookie */

		&& f1->st_ino == f2->st_ino);

 #else

	return (strcmp(f1->st_dev, f2->st_dev) == 0

		/* and 48-bit file id cookie stored in 3 short ints */

		&& f1->st_ino[0] == f2->st_ino[0]

		&& f1->st_ino[1] == f2->st_ino[1]

		&& f1->st_ino[2] == f2->st_ino[2]);

#endif

}

int

os_isatty(int fd)

{

	return (isatty(fd) > 0);

}

void

init_sockets(void)

{

}