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make-dfsg/vms_progname.c
Paul Smith 798ebd241b Update Copyright statements for the new year.
2016-02-28 12:55:20 -05:00

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/* File: vms_progname.c
*
* This module provides a fixup of the program name.
*
* This module is designed to be a plug in replacement for the
* progname module used by many GNU utilities with a few enhancements
* needed for GNU Make.
*
* It does not support the HAVE_DECL_PROGRAM_INVOCATION_* macros at this
* time.
*
* Make sure that the program_name string is set as close as possible to
* what the original command was given.
*
* When run from DCL, The argv[0] element is initialized with an absolute
* path name. The decc$ feature logical names can control the format
* of this pathname. In some cases it causes the UNIX format name to be
* formatted incorrectly.
*
* This DCL provided name is usually incompatible with what is expected to
* be provided by Unix programs and needs to be replaced.
*
* When run from an exec() call, the argv[0] element is initialized by the
* program. This name is compatible with what is expected to be provided
* by Unix programs and should be passed through unchanged.
*
* The DCL provided name can be detected because it always contains the
* device name.
*
* DCL examples:
* devname:[dir]program.exe;1 Normal VMS - remove path and .EXE;n
* devname:[dir]facility$program.exe;1 Facility also needs removal.
* /devname/dir/program.exe
* /DISK$VOLUME/dir/program.exe.1 Bug version should not be there.
* /DISK$VOLUME/dir/program. Bug Period should not be there.
*
*/
/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>. */
/* Per copyright assignment agreement with the Free Software Foundation
this software may be available under under other license agreements
and copyrights. */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <descrip.h>
#include <dvidef.h>
#include <efndef.h>
#include <fscndef.h>
#include <stsdef.h>
#ifdef USE_PROGNAME_H
# include "progname.h"
#endif
#pragma member_alignment save
#pragma nomember_alignment longword
struct item_list_3
{
unsigned short len;
unsigned short code;
void * bufadr;
unsigned short * retlen;
};
struct filescan_itmlst_2
{
unsigned short length;
unsigned short itmcode;
char * component;
};
#pragma member_alignment
int
SYS$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);
/* String containing name the program is called with.
To be initialized by main(). */
const char *program_name = NULL;
static int internal_need_vms_symbol = 0;
static char vms_new_nam[256];
int
need_vms_symbol (void)
{
return internal_need_vms_symbol;
}
void
set_program_name (const char *argv0)
{
int status;
int result;
#ifdef DEBUG
printf ("original argv0 = %s\n", argv0);
#endif
/* Posix requires non-NULL argv[0] */
if (argv0 == NULL)
{
fputs ("A NULL argv[0] was passed through an exec system call.\n",
stderr);
abort ();
}
program_name = argv0;
result = 0;
internal_need_vms_symbol = 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. */
if (argv0[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$descriptor_s devname_dsc;
char diskvolnam[256];
unsigned short diskvolnam_len;
internal_need_vms_symbol = 1;
/* Get some information about the disk */
/*--------------------------------------*/
itemlist[0].len = (sizeof alldevnam) - 1;
itemlist[0].code = DVI$_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$");
nextslash = strchr (&argv0[1], '/');
if (nextslash != NULL)
{
length = nextslash - argv0 - 1;
/* Cast needed for HP C compiler diagnostic */
devname_dsc.dsc$a_pointer = (char *)&argv0[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$getdviw fails, then this path was passed by */
/* An exec() program and not from DCL, so do nothing */
/* An example is "/tmp/program" where tmp: does not exist */
#ifdef DEBUG
printf ("sys$getdviw failed with status %d\n", status);
#endif
result = 0;
}
else if (!$VMS_STATUS_SUCCESS (dvi_iosb[0]))
{
#ifdef DEBUG
printf ("sys$getdviw failed with iosb %d\n", dvi_iosb[0]);
#endif
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_new_nam, &argv0[1], length);
vms_new_nam[length] = 0;
result = (strcasecmp (devnam, vms_new_nam) == 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))
{
strncpy (vms_new_nam, &argv0[1], length);
vms_new_nam[length] = 0;
result = (strcasecmp (diskvolnam, vms_new_nam) == 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$descriptor_s path_desc;
int status;
unsigned long field_flags;
struct filescan_itmlst_2 item_list[5];
char * volume;
char * name;
int name_len;
char * ext;
path_desc.dsc$a_pointer = (char *)argv0; /* cast ok */
path_desc.dsc$w_length = strlen (argv0);
path_desc.dsc$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$w_length) &&
(item_list[1].length != 0))
{
char * dollar;
int keep_ext;
int i;
/* We need the filescan to be successful, */
/* same length as input, and a volume to be present */
internal_need_vms_symbol = 1;
/* We will assume that we only get to this path on a version */
/* of VMS that does not support the EFS character set */
/* There may be a xxx$ 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, '$');
if (dollar != NULL)
{
dollar++;
name_len = name_len - (dollar - name);
name = dollar;
}
strncpy (vms_new_nam, name, name_len);
vms_new_nam[name_len] = 0;
/* Commit to using the new name */
program_name = vms_new_nam;
/* We only keep the extension if it is not ".exe" */
keep_ext = 0;
ext = item_list[3].component;
if (item_list[3].length != 1)
{
keep_ext = 1;
if (item_list[3].length == 4)
{
if ((ext[1] == 'e' || ext[1] == 'E') &&
(ext[2] == 'x' || ext[2] == 'X') &&
(ext[3] == 'e' || ext[3] == 'E'))
keep_ext = 0;
}
}
if (keep_ext == 1)
strncpy (&vms_new_nam[name_len], ext, item_list[3].length);
}
}
if (result)
{
char * lastslash;
char * dollar;
char * dotexe;
char * lastdot;
char * extension;
/* This means it is probably the name from a DCL command */
/* Find the last slash which separates the file from the */
/* path. */
lastslash = strrchr (argv0, '/');
if (lastslash != NULL) {
int i;
lastslash++;
/* There may be a xxx$ 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_new_nam, 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_new_nam, '.');
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_new_nam, '.');
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;
}
}
}
/* Commit to new name */
program_name = vms_new_nam;
} else {
/* There is no way that the code should ever get here */
/* As we already verified that the '/' was present */
fprintf (stderr, "Sanity failure somewhere we lost a '/'\n");
}
}
}
#ifdef DEBUG
int
main (int argc, char ** argv, char **env)
{
char command[1024];
set_program_name (argv[0]);
printf ("modified argv[0] = %s\n", program_name);
return 0;
}
#endif
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