Category : C Source Code
Archive   : DMAKE38A.ZIP
Filename : SYSINTF.C

/* RCS -- $Header: /u2/dvadura/src/generic/dmake/src/RCS/sysintf.c,v 1.1 1992/01/24 03:27:08 dvadura Exp $
-- SYNOPSIS -- system independent interface
--
-- DESCRIPTION
-- These are the routines constituting the system interface.
-- The system is taken to be essentially POSIX conformant.
-- The original code was extensively revised by T J Thompson at MKS,
-- and the library cacheing was added by Eric Gisin at MKS. I then
-- revised the code yet again, to improve the lib cacheing, and to
-- make it more portable.
--
-- The following is a list of routines that are required by this file
-- in order to work. These routines are provided as functions by the
-- standard C lib of the target system or as #defines in system/sysintf.h
-- or via appropriate C code in the system/ directory for the given
-- system.
--
-- The first group must be provided by a file in the system/ directory
-- the second group is ideally provided by the C lib. However, there
-- are instances where the C lib implementation of the specified routine
-- does not exist, or is incorrect. In these instances the routine
-- must be provided by the the user in the system/ directory of dmake.
-- (For example, the bsd/ dir contains code for putenv(), and tempnam())
--
-- DMAKE SPECIFIC:
-- seek_arch()
-- touch_arch()
-- void_lcache()
-- runargv()
-- STAT()
-- Remove_prq()
--
-- C-LIB SPECIFIC: (should be present in your C-lib)
-- utime()
-- time()
-- getenv()
-- putenv()
-- getcwd()
-- signal()
-- chdir()
-- tempnam()
--
-- AUTHOR
-- Dennis Vadura, [email protected]
-- CS DEPT, University of Waterloo, Waterloo, Ont., Canada
--
-- COPYRIGHT
-- Copyright (c) 1990 by Dennis Vadura. All rights reserved.
--
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- (version 1), as published by the Free Software Foundation, and
-- found in the file 'LICENSE' included with this distribution.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warrant 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., 675 Mass Ave, Cambridge, MA 02139, USA.
--
-- LOG
-- $Log: sysintf.c,v $
* Revision 1.1 1992/01/24 03:27:08 dvadura
* dmake Version 3.8, Initial revision
*
*/

#include "extern.h"
#include "sysintf.h"

/*
** Tries to stat the file name. Returns 0 if the file
** does not exist. Note that if lib is not null it tries to stat
** the name found inside lib.
**
** If member is NOT nil then look for the library object which defines the
** symbol given by name. If found _strdup the name and return make the
** pointer pointed at by sym point at it. Not handled for now!
*/
PUBLIC time_t
Do_stat(name, lib, member)
char *name;
char *lib;
char **member;
{
struct stat buf;
time_t seek_arch();

if( member != NIL(char *) )
Fatal("Library symbol names not supported");

buf.st_mtime = (time_t)0L;
if( lib != NIL(char) )
return( seek_arch(basename(name), lib) );
else if( strlen(basename(name)) > _POSIX_NAME_MAX )
return((time_t)0L);
else
return( (STAT(name,&buf)==-1 || (Augmake && (buf.st_mode & S_IFDIR)))
? (time_t)0L
: (time_t) buf.st_mtime
);
}



/* Touch existing file to force modify time to present.
*/
PUBLIC int
Do_touch(name, lib, member)
char *name;
char *lib;
char **member;
{
if( member != NIL(char *) )
Fatal("Library symbol names not supported");

if (lib != NIL(char))
return( touch_arch(basename(name), lib) );
else
return( utime(name, NIL(time_t)) );
}



PUBLIC void
Void_lib_cache( lib_name, member_name )/*
=========================================
Void the library cache for lib lib_name, and member member_name. */
char *lib_name;
char *member_name;
{
VOID_LCACHE( lib_name, member_name );
}



/*
** return the current time
*/
PUBLIC time_t
Do_time()
{
extern time_t time();
return (time((time_t*)0));
}



/*
** Execute the string passed in as a command and return
** the return code. The command line arguments are
** assumed to be separated by spaces or tabs. The first
** such argument is assumed to be the command.
**
** If group is true then this is a group of commands to be fed to the
** the shell as a single unit. In this case cmd is of the form
** "file" indicating the file that should be read by the shell
** in order to execute the command group.
*/
PUBLIC int
Do_cmnd(cmd, group, do_it, target, ignore, shell, last)
char *cmd;
int group;
int do_it;
CELLPTR target;
int ignore;
int shell;
int last;
{
int i;

if( !do_it ) {
if( last && !Doing_bang ) {
Update_time_stamp( target );
}
return(0);
}

if( Max_proc == 1 ) Wait_for_completion = TRUE;

if( (i = runargv(target, ignore, group, last, shell, cmd)) == -1 )
Quit();

/* NOTE: runargv must return either 0 or 1, 0 ==> command executed, and
* we waited for it to return, 1 ==> command started and is running
* concurrently with make process. */
return(i);
}


#define MINARGV 64
/* Take a command and pack it into an argument vector to be executed. */
PUBLIC char **
Pack_argv( group, shell, cmd )
int group;
int shell;
char *cmd;
{
static char **av = NIL(char *);
static int avs = 0;
int i = 0;

if( av == NIL(char *) ) {
TALLOC(av, MINARGV, char*);
avs = MINARGV;
}

if( (Packed_shell = shell||group||(*_strpbrk(cmd, Shell_metas)!='\0')) ) {
char* sh = group ? GShell : Shell;

if( sh != NIL(char) ) {
av[i++] = sh;
if( (av[i] = (group?GShell_flags:Shell_flags)) != NIL(char) ) i++;

av[i++] = cmd;
av[i] = NIL(char);
}
else
Fatal("%sSHELL macro not defined", group?"GROUP":"");
}
else {
do {
while( iswhite(*cmd) ) ++cmd;
if( *cmd ) av[i++] = cmd;

while( *cmd != '\0' && !iswhite(*cmd) ) ++cmd;
if( *cmd ) *cmd++ = '\0';

if( i == avs ) {
avs += MINARGV;
av = (char **) realloc( av, avs*sizeof(char *) );
}
} while( *cmd );

av[i] = NIL(char);
}

return(av);
}


/*
** Return the value of ename from the environment
** if ename is not defined in the environment then
** NIL(char) should be returned
*/
PUBLIC char *
Read_env_string(ename)
char *ename;
{
#if !defined(_MSC_VER) || _MSC_VER < 600
extern char *getenv();
#endif
return( getenv(ename) );
}



/*
** Set the value of the environment string ename to value.
** Returns 0 if success, non-zero if failure
*/
PUBLIC int
Write_env_string(ename, value)
char *ename;
char *value;
{
extern int putenv();
char* p;
char* envstr = _stradd(ename, value, FALSE);

p = envstr+strlen(ename); /* Don't change this code, _stradd does not */
*p++ = '='; /* add the space if *value is 0, it does */
if( !*value ) *p = '\0'; /* allocate enough memory for one though. */

return( putenv(envstr) );
}



PUBLIC void
ReadEnvironment()
{
extern char **Rule_tab;
#if !defined(_MSC_VER)
extern char **environ;
#endif
char **rsave;

#if !defined(__ZTC__) && !defined(_MPW)
# define make_env()
# define free_env()
#else
void make_env();
void free_env();
#endif

make_env();

rsave = Rule_tab;
Rule_tab = environ;
Readenv = TRUE;

Parse( NIL(FILE) );

Readenv = FALSE;
Rule_tab = rsave;

free_env();
}



/*
** All we have to catch is SIG_INT
*/
PUBLIC void
Catch_signals(fn)
void (*fn)();
{
if( signal(SIGINT, SIG_IGN) != SIG_IGN )
signal( SIGINT, fn );
if( signal(SIGQUIT, SIG_IGN) != SIG_IGN )
signal( SIGQUIT, fn );
}



/*
** Clear any previously set signals
*/
PUBLIC void
Clear_signals()
{
if( signal(SIGINT, SIG_IGN) != SIG_IGN )
signal( SIGINT, SIG_DFL );
if( signal(SIGQUIT, SIG_IGN) != SIG_IGN )
signal( SIGQUIT, SIG_DFL );
}



/*
** Set program name
*/
PUBLIC void
Prolog(argc, argv)
int argc;
char* argv[];
{
char buf[50];

Pname = (argc == 0) ? DEF_MAKE_PNAME : argv[0];
sprintf( buf, "dmake-%d-root", GETPID );
Root = Def_cell( buf );
tzset();
}



/*
** Do any clean up for exit.
*/
PUBLIC void
Epilog(ret_code)
int ret_code;
{
Write_state();
Unlink_temp_files(Root);
Hook_std_writes(NIL(char)); /* For MSDOS tee (-F option) */
exit( ret_code );
}



/*
** Use the built-in functions of the operating system to get the current
** working directory.
*/
PUBLIC char *
Get_current_dir()
{
static char buf[MAX_PATH_LEN+2];
return(getcwd(buf, sizeof(buf)));
}



/*
** change working directory
*/
PUBLIC int
Set_dir(path)
char* path;
{
return( chdir(path) );
}



/*
** return switch char
*/
PUBLIC char
Get_switch_char()
{
return( getswitchar() );
}



/*
** Generate a temporary file name and open the file for writing.
** If a name cannot be generated or the file cannot be opened
** return -1, else return the fileno of the open file.
** and update the source file pointer to point at the new file name.
** Note that the new name should be freed when the file is removed.
*/
PUBLIC FILE*
Get_temp(path, suff, op)
char **path;
char *suff;
int op;
{
extern char *tempnam();

*path = _strjoin( tempnam(NIL(char), "mk"), suff, -1, TRUE );
Def_macro( "TMPFILE", *path, M_MULTI|M_EXPANDED );

return( op?fopen(*path, "w"):NIL(FILE) );
}


/*
** Open a new temporary file and set it up for writing.
*/
PUBLIC FILE *
Start_temp( suffix, cp, fname )
char *suffix;
CELLPTR cp;
char **fname;
{
FILE *fp;
char *tmpname;
char *name;

name = (cp != NIL(CELL))?cp->CE_NAME:"makefile text";

if( (fp = Get_temp(&tmpname, suffix, TRUE)) == NIL(FILE) )
Open_temp_error( tmpname, name );

Link_temp( cp, fp, tmpname );
*fname = tmpname;

return( fp );
}


/*
** Issue an error on failing to open a temporary file
*/
PUBLIC void
Open_temp_error( tmpname, name )
char *tmpname;
char *name;
{
Fatal("Cannot open temp file `%s' while processing `%s'", tmpname, name );
}


/*
** Link a temp file onto the list of files.
*/
PUBLIC void
Link_temp( cp, fp, fname )
CELLPTR cp;
FILE *fp;
char *fname;
{
FILELISTPTR new;

if( cp == NIL(CELL) ) cp = Root;

TALLOC( new, 1, FILELIST );

new->fl_next = cp->ce_files;
new->fl_name = fname;
new->fl_file = fp; /* indicates temp file is open */

cp->ce_files = new;
}


/*
** Close a previously used temporary file.
*/
PUBLIC void
Close_temp(cp, file)
CELLPTR cp;
FILE *file;
{
FILELISTPTR fl;
if( cp == NIL(CELL) ) cp = Root;

for( fl=cp->ce_files; fl && fl->fl_file != file; fl=fl->fl_next );
if( fl ) {
fl->fl_file = NIL(FILE);
fclose(file);
}
}


/*
** Clean-up, and close all temporary files associated with a target.
*/
PUBLIC void
Unlink_temp_files( cp )/*
==========================
Unlink the tempfiles if any exist. Make sure you close the files first
though. This ensures that under DOS there is no disk space lost. */
CELLPTR cp;
{
FILELISTPTR cur, next;

if( cp == NIL(CELL) || cp->ce_files == NIL(FILELIST) ) return;

for( cur=cp->ce_files; cur != NIL(FILELIST); cur=next ) {
next = cur->fl_next;

if( cur->fl_file ) fclose( cur->fl_file );

if( Verbose & V_LEAVE_TMP )
printf( "%s: Left temp file [%s]\n", Pname, cur->fl_name );
else
(void) Remove_file( cur->fl_name );

FREE(cur->fl_name);
FREE(cur);
}

cp->ce_files = NIL(FILELIST);
}


PUBLIC void
Handle_result(status, ignore, abort_flg, target)
int status;
int ignore;
int abort_flg;
CELLPTR target;
{
status = ((status&0xff)==0 ? status>>8
: (status & 0xff)==SIGTERM ? -1
: (status & 0x7f)+128);

if( status )
if( !abort_flg ) {
fprintf( stderr, "%s: Error code %d, while making '%s'",
Pname, status, target->ce_fname );

if( ignore || Continue ) {
fputs( " (Ignored)\n", stderr );
}
else {
fputc( '\n', stderr );

if( !(target->ce_attr & A_PRECIOUS) )
if( Remove_file( target->ce_fname ) == 0 )
fprintf(stderr,"%s: '%s' removed.\n",Pname,target->ce_fname);

Quit();
}
}
else if( !(target->ce_attr & A_PRECIOUS) )
Remove_file( target->ce_fname );
}


PUBLIC void
Update_time_stamp( cp )
CELLPTR cp;
{
HASHPTR hp;
CELLPTR tcp;
int tmpflg;
int phony = ((cp->ce_attr&A_PHONY) != 0);

tcp = cp;
do {
if( tcp->ce_attr & A_LIBRARY )
Void_lib_cache( tcp->ce_fname, NIL(char) );
else if( !Touch && (tcp->ce_attr & A_LIBRARYM) )
Void_lib_cache( tcp->ce_lib, tcp->ce_fname );

if( !phony )
Stat_target(tcp, -1);

if( tcp->ce_time == (time_t) 0L )
tcp->ce_time = Do_time();

if( Trace )
tcp->ce_flag |= F_STAT; /* pretend we stated ok */

if( Verbose & V_MAKE )
printf( "%s: <<<< Set [%s] time stamp to %ld\n",
Pname, tcp->CE_NAME, tcp->ce_time );

Unlink_temp_files( tcp );
tcp->ce_flag |= F_MADE;
tcp->ce_attr |= A_UPDATED;
tcp = tcp->ce_all;
}
while( tcp != NIL(CELL) && tcp != cp );


/* Scan the list of prerequisites and if we find one that is
* marked as being removable, (ie. an inferred intermediate node
* then remove it. We remove a prerequisite by running the recipe
* associated with the special target .REMOVE, with $< set to
* the list of prerequisites to remove. */

/* Make sure we don't try to remove prerequisites for the .REMOVE
* target. */
if( strcmp(cp->CE_NAME,".REMOVE") != 0 &&
(hp = Get_name( ".REMOVE", Defs, FALSE )) != NIL(HASH) ) {
register LINKPTR dp;
int flag = FALSE;
int rem;
t_attr attr;

tcp = hp->CP_OWNR;

tcp->ce_flag |= F_TARGET;
Clear_prerequisites( tcp );

for( dp = cp->ce_prq; dp != NIL(LINK); dp = dp->cl_next ) {
register CELLPTR prq = dp->cl_prq;

attr = Glob_attr | prq->ce_attr;
rem = (prq->ce_flag & F_REMOVE) &&
(prq->ce_flag & F_MADE ) &&
!(prq->ce_attr & A_PHONY) &&
!(attr & A_PRECIOUS) &&
!Force;

if( rem ) {
CELLPTR tmp = prq;
do {
(Add_prerequisite(tcp,prq,FALSE,FALSE))->cl_flag |= F_TARGET;
prq->ce_flag &= ~F_REMOVE;
prq = prq->ce_all;
}
while( prq != NIL(CELL) && prq != tmp );
flag = TRUE;
}
}

if( flag ) {
Remove_prq( tcp );

for( dp=tcp->ce_prq; dp != NIL(LINK); dp=dp->cl_next ) {
register CELLPTR prq = dp->cl_prq;

prq->ce_flag &= ~(F_MADE|F_VISITED|F_STAT);
prq->ce_flag |= F_REMOVE;
prq->ce_time = (time_t)0L;
}
}
}
}


PUBLIC int
Remove_file( name )
char *name;
{
struct stat buf;

if( stat(name, &buf) != 0 )
return 1;
if( (buf.st_mode & S_IFMT) == S_IFDIR )
return 1;
return(unlink(name));
}