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mosesdecoder/jam-files/engine/pathvms.c

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/*
* Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/* This file is ALSO:
* Copyright 2001-2004 David Abrahams.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
*/
# include "jam.h"
# include "pathsys.h"
# ifdef OS_VMS
# define DEBUG
/*
* pathvms.c - manipulate file names on VMS
*
* External routines:
*
* path_parse() - split a file name into dir/base/suffix/member
* path_build() - build a filename given dir/base/suffix/member
* path_parent() - make a PATHNAME point to its parent dir
*
* File_parse() and path_build() just manipuate a string and a structure;
* they do not make system calls.
*
* WARNING! This file contains voodoo logic, as black magic is
* necessary for wrangling with VMS file name. Woe be to people
* who mess with this code.
*
* 02/09/95 (seiwald) - bungled R=[xxx] - was using directory length!
* 05/03/96 (seiwald) - split from filevms.c
*/
/*
* path_parse() - split a file name into dir/base/suffix/member.
*/
void path_parse( char * file, PATHNAME * f )
{
char * p;
char * q;
char * end;
memset( (char *)f, 0, sizeof( *f ) );
/* Look for <grist> */
if ( ( file[0] == '<' ) && ( p = strchr( file, '>' ) ) )
{
f->f_grist.ptr = file;
f->f_grist.len = p - file;
file = p + 1;
}
/* Look for dev:[dir] or dev: */
if ( ( p = strchr( file, ']' ) ) || ( p = strchr( file, ':' ) ) )
{
f->f_dir.ptr = file;
f->f_dir.len = p + 1 - file;
file = p + 1;
}
end = file + strlen( file );
/* Look for (member). */
if ( ( p = strchr( file, '(' ) ) && ( end[ -1 ] == ')' ) )
{
f->f_member.ptr = p + 1;
f->f_member.len = end - p - 2;
end = p;
}
/* Look for .suffix */
/* This would be memrchr(). */
p = 0;
q = file;
while ( q = (char *)memchr( q, '.', end - q ) )
p = q++;
if ( p )
{
f->f_suffix.ptr = p;
f->f_suffix.len = end - p;
end = p;
}
/* Leaves base. */
f->f_base.ptr = file;
f->f_base.len = end - file;
/* Is this a directory without a file spec? */
f->parent = 0;
}
/*
* dir mods result
* --- --- ------
* Rerooting:
*
* (none) :R=dev: dev:
* devd: :R=dev: devd:
* devd:[dir] :R=dev: devd:[dir]
* [.dir] :R=dev: dev:[dir] questionable
* [dir] :R=dev: dev:[dir]
*
* (none) :R=[rdir] [rdir] questionable
* devd: :R=[rdir] devd:
* devd:[dir] :R=[rdir] devd:[dir]
* [.dir] :R=[rdir] [rdir.dir] questionable
* [dir] :R=[rdir] [rdir]
*
* (none) :R=dev:[root] dev:[root]
* devd: :R=dev:[root] devd:
* devd:[dir] :R=dev:[root] devd:[dir]
* [.dir] :R=dev:[root] dev:[root.dir]
* [dir] :R=dev:[root] [dir]
*
* Climbing to parent:
*
*/
# define DIR_EMPTY 0 /* empty string */
# define DIR_DEV 1 /* dev: */
# define DIR_DEVDIR 2 /* dev:[dir] */
# define DIR_DOTDIR 3 /* [.dir] */
# define DIR_DASHDIR 4 /* [-] or [-.dir] */
# define DIR_ABSDIR 5 /* [dir] */
# define DIR_ROOT 6 /* [000000] or dev:[000000] */
# define G_DIR 0 /* take just dir */
# define G_ROOT 1 /* take just root */
# define G_VAD 2 /* root's dev: + [abs] */
# define G_DRD 3 /* root's dev:[dir] + [.rel] */
# define G_VRD 4 /* root's dev: + [.rel] made [abs] */
# define G_DDD 5 /* root's dev:[dir] + . + [dir] */
static int grid[7][7] = {
/* root/dir EMPTY DEV DEVDIR DOTDIR DASH, ABSDIR ROOT */
/* EMPTY */ G_DIR, G_DIR, G_DIR, G_DIR, G_DIR, G_DIR, G_DIR,
/* DEV */ G_ROOT, G_DIR, G_DIR, G_VRD, G_VAD, G_VAD, G_VAD,
/* DEVDIR */ G_ROOT, G_DIR, G_DIR, G_DRD, G_VAD, G_VAD, G_VAD,
/* DOTDIR */ G_ROOT, G_DIR, G_DIR, G_DRD, G_DIR, G_DIR, G_DIR,
/* DASHDIR */ G_ROOT, G_DIR, G_DIR, G_DRD, G_DDD, G_DIR, G_DIR,
/* ABSDIR */ G_ROOT, G_DIR, G_DIR, G_DRD, G_DIR, G_DIR, G_DIR,
/* ROOT */ G_ROOT, G_DIR, G_DIR, G_VRD, G_DIR, G_DIR, G_DIR,
};
struct dirinf
{
int flags;
struct
{
char * ptr;
int len;
} dev, dir;
};
static char * strnchr( char * buf, int c, int len )
{
while ( len-- )
if ( *buf && ( *buf++ == c ) )
return buf - 1;
return 0;
}
static void dir_flags( char * buf, int len, struct dirinf * i )
{
char * p;
if ( !buf || !len )
{
i->flags = DIR_EMPTY;
i->dev.ptr =
i->dir.ptr = 0;
i->dev.len =
i->dir.len = 0;
}
else if ( p = strnchr( buf, ':', len ) )
{
i->dev.ptr = buf;
i->dev.len = p + 1 - buf;
i->dir.ptr = buf + i->dev.len;
i->dir.len = len - i->dev.len;
i->flags = i->dir.len && *i->dir.ptr == '[' ? DIR_DEVDIR : DIR_DEV;
}
else
{
i->dev.ptr = buf;
i->dev.len = 0;
i->dir.ptr = buf;
i->dir.len = len;
if ( ( *buf == '[' ) && ( buf[1] == ']' ) )
i->flags = DIR_EMPTY;
else if ( ( *buf == '[' ) && ( buf[1] == '.' ) )
i->flags = DIR_DOTDIR;
else if ( ( *buf == '[' ) && ( buf[1] == '-' ) )
i->flags = DIR_DASHDIR;
else
i->flags = DIR_ABSDIR;
}
/* But if its rooted in any way. */
if ( ( i->dir.len == 8 ) && !strncmp( i->dir.ptr, "[000000]", 8 ) )
i->flags = DIR_ROOT;
}
/*
* path_build() - build a filename given dir/base/suffix/member
*/
void path_build( PATHNAME * f, string * file, int binding )
{
struct dirinf root;
struct dirinf dir;
int g;
file_build1( f, file );
/* Get info on root and dir for combining. */
dir_flags( f->f_root.ptr, f->f_root.len, &root );
dir_flags( f->f_dir.ptr, f->f_dir.len, &dir );
/* Combine. */
switch ( g = grid[ root.flags ][ dir.flags ] )
{
case G_DIR:
/* take dir */
string_append_range( file, f->f_dir.ptr, f->f_dir.ptr + f->f_dir.len );
break;
case G_ROOT:
/* take root */
string_append_range( file, f->f_root.ptr, f->f_root.ptr + f->f_root.len );
break;
case G_VAD:
/* root's dev + abs directory */
string_append_range( file, root.dev.ptr, root.dev.ptr + root.dev.len );
string_append_range( file, dir.dir.ptr, dir.dir.ptr + dir.dir.len );
break;
case G_DRD:
case G_DDD:
/* root's dev:[dir] + rel directory */
string_append_range( file, f->f_root.ptr, f->f_root.ptr + f->f_root.len );
/* sanity checks: root ends with ] */
if ( file->value[file->size - 1] == ']' )
string_pop_back( file );
/* Add . if separating two -'s */
if ( g == G_DDD )
string_push_back( file, '.' );
/* skip [ of dir */
string_append_range( file, dir.dir.ptr + 1, dir.dir.ptr + 1 + dir.dir.len - 1 );
break;
case G_VRD:
/* root's dev + rel directory made abs */
string_append_range( file, root.dev.ptr, root.dev.ptr + root.dev.len );
string_push_back( file, '[' );
/* skip [. of rel dir */
string_append_range( file, dir.dir.ptr + 2, dir.dir.ptr + 2 + dir.dir.len - 2 );
break;
}
# ifdef DEBUG
if ( DEBUG_SEARCH && ( root.flags || dir.flags ) )
printf( "%d x %d = %d (%s)\n", root.flags, dir.flags,
grid[ root.flags ][ dir.flags ], file->value );
# endif
/*
* Now do the special :P modifier when no file was present.
* (none) (none)
* [dir1.dir2] [dir1]
* [dir] [000000]
* [.dir] (none)
* [] []
*/
if ( ( file->value[ file->size - 1 ] == ']' ) && f->parent )
{
char * p = file->value + file->size;
while ( p-- > file->value )
{
if ( *p == '.' )
{
/* If we've truncated everything and left with '[',
return empty string. */
if ( p == file->value + 1 )
string_truncate( file, 0 );
else
{
string_truncate( file, p - file->value );
string_push_back( file, ']' );
}
break;
}
if ( *p == '-' )
{
/* handle .- or - */
if ( ( p > file->value ) && ( p[ -1 ] == '.' ) )
--p;
*p++ = ']';
break;
}
if ( *p == '[' )
{
if ( p[ 1 ] == ']' )
{
/* CONSIDER: I don't see any use of this code. We immediately
break, and 'p' is a local variable. */
p += 2;
}
else
{
string_truncate( file, p - file->value );
string_append( file, "[000000]" );
}
break;
}
}
}
/* Now copy the file pieces. */
if ( f->f_base.len )
{
string_append_range( file, f->f_base.ptr, f->f_base.ptr + f->f_base.len );
}
/* If there is no suffix, we append a "." onto all generated names. This
* keeps VMS from appending its own (wrong) idea of what the suffix should
* be.
*/
if ( f->f_suffix.len )
string_append_range( file, f->f_suffix.ptr, f->f_suffix.ptr + f->f_suffix.len );
else if ( binding && f->f_base.len )
string_push_back( file, '.' );
if ( f->f_member.len )
{
string_push_back( file, '(' );
string_append_range( file, f->f_member.ptr, f->f_member.ptr + f->f_member.len );
string_push_back( file, ')' );
}
# ifdef DEBUG
if ( DEBUG_SEARCH )
printf( "built %.*s + %.*s / %.*s suf %.*s mem %.*s -> %s\n",
f->f_root.len, f->f_root.ptr,
f->f_dir.len, f->f_dir.ptr,
f->f_base.len, f->f_base.ptr,
f->f_suffix.len, f->f_suffix.ptr,
f->f_member.len, f->f_member.ptr,
file->value );
# endif
}
/*
* path_parent() - make a PATHNAME point to its parent dir
*/
void path_parent( PATHNAME * f )
{
if ( f->f_base.len )
{
f->f_base.ptr =
f->f_suffix.ptr =
f->f_member.ptr = "";
f->f_base.len =
f->f_suffix.len =
f->f_member.len = 0;
}
else
{
f->parent = 1;
}
}
# endif /* VMS */
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