bullet3/jam-2.5/pathvms.c
2006-05-25 19:18:29 +00:00

432 lines
8.7 KiB
C

/*
* Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/*
* 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
* 11/04/02 (seiwald) - const-ing for string literals
*/
# include "jam.h"
# include "pathsys.h"
# ifdef OS_VMS
# define DEBUG
/*
* path_parse() - split a file name into dir/base/suffix/member
*/
void
path_parse(
const char *file,
PATHNAME *f )
{
const char *p, *q;
const 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(
const char *buf,
int len,
struct dirinf *i )
{
const 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( (char *)buf, ':', len ) )
{
i->dev.ptr = (char *)buf;
i->dev.len = p + 1 - buf;
i->dir.ptr = (char *)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 = (char *)buf;
i->dev.len = 0;
i->dir.ptr = (char *)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,
char *file,
int binding )
{
char *ofile = file;
struct dirinf root, dir;
int g;
/* Start with the grist. If the current grist isn't */
/* surrounded by <>'s, add them. */
if( f->f_grist.len )
{
if( f->f_grist.ptr[0] != '<' ) *file++ = '<';
memcpy( file, f->f_grist.ptr, f->f_grist.len );
file += f->f_grist.len;
if( file[-1] != '>' ) *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 */
memcpy( file, f->f_dir.ptr, f->f_dir.len );
file += f->f_dir.len;
break;
case G_ROOT:
/* take root */
memcpy( file, f->f_root.ptr, f->f_root.len );
file += f->f_root.len;
break;
case G_VAD:
/* root's dev + abs directory */
memcpy( file, root.dev.ptr, root.dev.len );
file += root.dev.len;
memcpy( file, dir.dir.ptr, dir.dir.len );
file += dir.dir.len;
break;
case G_DRD:
case G_DDD:
/* root's dev:[dir] + rel directory */
memcpy( file, f->f_root.ptr, f->f_root.len );
file += f->f_root.len;
/* sanity checks: root ends with ] */
if( file[-1] == ']' )
--file;
/* Add . if separating two -'s */
if( g == G_DDD )
*file++ = '.';
/* skip [ of dir */
memcpy( file, dir.dir.ptr + 1, dir.dir.len - 1 );
file += dir.dir.len - 1;
break;
case G_VRD:
/* root's dev + rel directory made abs */
memcpy( file, root.dev.ptr, root.dev.len );
file += root.dev.len;
*file++ = '[';
/* skip [. of rel dir */
memcpy( file, dir.dir.ptr + 2, dir.dir.len - 2 );
file += dir.dir.len - 2;
break;
}
# ifdef DEBUG
if( DEBUG_SEARCH && ( root.flags || dir.flags ) )
{
*file = 0;
printf( "%d x %d = %d (%s)\n", root.flags, dir.flags,
grid[ root.flags ][ dir.flags ], ofile );
}
# endif
/*
* Now do the special :P modifier when no file was present.
* (none) (none)
* [dir1.dir2] [dir1]
* [dir] [000000]
* [.dir] []
* [] []
*/
if( file[-1] == ']' && f->parent )
{
while( file-- > ofile )
{
if( *file == '.' )
{
*file++ = ']';
break;
}
else if( *file == '-' )
{
/* handle .- or - */
if( file > ofile && file[-1] == '.' )
--file;
*file++ = ']';
break;
}
else if( *file == '[' )
{
if( file[1] == ']' )
{
file += 2;
}
else
{
strcpy( file, "[000000]" );
file += 8;
}
break;
}
}
}
/* Now copy the file pieces. */
if( f->f_base.len )
{
memcpy( file, f->f_base.ptr, f->f_base.len );
file += 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 )
{
memcpy( file, f->f_suffix.ptr, f->f_suffix.len );
file += f->f_suffix.len;
}
else if( binding && f->f_base.len )
{
*file++ = '.';
}
if( f->f_member.len )
{
*file++ = '(';
memcpy( file, f->f_member.ptr, f->f_member.len );
file += f->f_member.len;
*file++ = ')';
}
*file = 0;
# 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,
ofile );
# 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 */