Net2/usr/src/contrib/rcs/src/rcsfnms.c
/*
* RCS file name handling
*/
#ifndef lint
static char
rcsid[]= "$Id: rcsfnms.c,v 3.12 89/08/15 21:38:10 bostic Exp $ Purdue CS";
#endif
/****************************************************************************
* creation and deletion of semaphorefile,
* creation of temporary filenames and cleanup()
* pairing of RCS file names and working file names.
* Testprogram: define PAIRTEST
****************************************************************************
*/
/* Copyright (C) 1982, 1988, 1989 Walter Tichy
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Walter Tichy.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Report all problems and direct all questions to:
* rcs-bugs@cs.purdue.edu
*
*/
/* $Log: rcsfnms.c,v $
* Revision 3.12 89/08/15 21:38:10 bostic
* Version 4 from Tom Narten at Purdue
*
* Revision 4.8 89/05/01 15:09:41 narten
* changed getwd to not stat empty directories.
*
* Revision 4.7 88/11/08 12:01:22 narten
* changes from eggert@sm.unisys.com (Paul Eggert)
*
* Revision 4.7 88/08/09 19:12:53 eggert
* Fix troff macro comment leader bug; add Prolog; allow cc -R; remove lint.
*
* Revision 4.6 87/12/18 11:40:23 narten
* additional file types added from 4.3 BSD version, and SPARC assembler
* comment character added. Also, more lint cleanups. (Guy Harris)
*
* Revision 4.5 87/10/18 10:34:16 narten
* Updating version numbers. Changes relative to 1.1 actually relative
* to verion 4.3
*
* Revision 1.3 87/03/27 14:22:21 jenkins
* Port to suns
*
* Revision 1.2 85/06/26 07:34:28 svb
* Comment leader '% ' for '*.tex' files added.
*
* Revision 1.1 84/01/23 14:50:24 kcs
* Initial revision
*
* Revision 4.3 83/12/15 12:26:48 wft
* Added check for KDELIM in file names to pairfilenames().
*
* Revision 4.2 83/12/02 22:47:45 wft
* Added csh, red, and sl file name suffixes.
*
* Revision 4.1 83/05/11 16:23:39 wft
* Added initialization of Dbranch to InitAdmin(). Canged pairfilenames():
* 1. added copying of path from workfile to RCS file, if RCS file is omitted;
* 2. added getting the file status of RCS and working files;
* 3. added ignoring of directories.
*
* Revision 3.7 83/05/11 15:01:58 wft
* Added comtable[] which pairs file name suffixes with comment leaders;
* updated InitAdmin() accordingly.
*
* Revision 3.6 83/04/05 14:47:36 wft
* fixed Suffix in InitAdmin().
*
* Revision 3.5 83/01/17 18:01:04 wft
* Added getwd() and rename(); these can be removed by defining
* V4_2BSD, since they are not needed in 4.2 bsd.
* Changed sys/param.h to sys/types.h.
*
* Revision 3.4 82/12/08 21:55:20 wft
* removed unused variable.
*
* Revision 3.3 82/11/28 20:31:37 wft
* Changed mktempfile() to store the generated file names.
* Changed getfullRCSname() to store the file and pathname, and to
* delete leading "../" and "./".
*
* Revision 3.2 82/11/12 14:29:40 wft
* changed pairfilenames() to handle file.sfx,v; also deleted checkpathnosfx(),
* checksuffix(), checkfullpath(). Semaphore name generation updated.
* mktempfile() now checks for nil path; freefilename initialized properly.
* Added Suffix .h to InitAdmin. Added testprogram PAIRTEST.
* Moved rmsema, trysema, trydiraccess, getfullRCSname from rcsutil.c to here.
*
* Revision 3.1 82/10/18 14:51:28 wft
* InitAdmin() now initializes StrictLocks=STRICT_LOCKING (def. in rcsbase.h).
* renamed checkpath() to checkfullpath().
*/
#include "rcsbase.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/dir.h>
extern char * rindex();
extern char * mktemp();
extern FILE * fopen();
extern char * getwd(); /* get working directory; forward decl */
extern int stat(), fstat();
extern FILE * finptr; /* RCS input file descriptor */
extern FILE * frewrite; /* New RCS file descriptor */
extern char * RCSfilename, * workfilename; /* filenames */
struct stat RCSstat, workstat; /* file status for RCS file and working file */
int haveRCSstat, haveworkstat; /* indicators if status availalble */
char tempfilename [NCPFN+10]; /* used for derived file names */
char sub1filename [NCPPN]; /* used for files path/file.sfx,v */
char sub2filename [NCPPN]; /* used for files path/RCS/file.sfx,v */
char semafilename [NCPPN]; /* name of semaphore file */
int madesema; /* indicates whether a semaphore file has been set */
char * tfnames[10]; /* temp. file names to be unlinked when finished */
int freefilename; /* index of next free file name in tfnames[] */
struct compair {
char * suffix, * comlead;
};
struct compair comtable[] = {
/* comtable pairs each filename suffix with a comment leader. The comment */
/* leader is placed before each line generated by the $Log keyword. This */
/* table is used to guess the proper comment leader from the working file's */
/* suffix during initial ci (see InitAdmin()). Comment leaders are needed */
/* for languages without multiline comments; for others they are optional. */
"c", " * ", /* C */
"csh", "# ", /* shell */
"e", "# ", /* efl */
"f", "c ", /* fortran */
"h", " * ", /* C-header */
"l", " * ", /* lex NOTE: conflict between lex and franzlisp*/
"mac", "; ", /* macro vms or dec-20 or pdp-11 macro */
"me", ".\\\" ",/* me-macros t/nroff*/
"mm", ".\\\" ",/* mm-macros t/nroff*/
"ms", ".\\\" ",/* ms-macros t/nroff*/
"p", " * ", /* pascal */
"pl", "% ", /* prolog */
"r", "# ", /* ratfor */
"red", "% ", /* psl/rlisp */
#ifdef sparc
"s", "! ", /* assembler */
#endif
#ifdef mc68000
"s", "| ", /* assembler */
#endif
#ifdef pdp11
"s", "/ ", /* assembler */
#endif
#ifdef vax
"s", "# ", /* assembler */
#endif
"sh", "# ", /* shell */
"sl", "% ", /* psl */
"red", "% ", /* psl/rlisp */
"cl", ";;; ", /* common lisp */
"ml", "; ", /* mocklisp */
"el", "; ", /* gnulisp */
"tex", "% ", /* tex */
"y", " * ", /* yacc */
"ye", " * ", /* yacc-efl */
"yr", " * ", /* yacc-ratfor */
"", "# ", /* default for empty suffix */
nil, "" /* default for unknown suffix; must always be last */
};
ffclose(fptr)
FILE * fptr;
/* Function: checks ferror(fptr) and aborts the program if there were
* errors; otherwise closes fptr.
*/
{ if (ferror(fptr) || fclose(fptr)==EOF)
faterror("File read or write error; file system full?");
}
int trysema(RCSname,makesema)
char * RCSname; int makesema;
/* Function: Checks whether a semaphore file exists for RCSname. If yes,
* returns false. If not, creates one if makesema==true and returns true
* if successful. If a semaphore file was created, madesema is set to true.
* The name of the semaphore file is put into variable semafilename.
*/
{
register char * tp, *sp, *lp;
int fdesc;
sp=RCSname;
lp = rindex(sp,'/');
if (lp==0) {
semafilename[0]='.'; semafilename[1]='/';
tp= &semafilename[2];
} else {
/* copy path */
tp=semafilename;
do *tp++ = *sp++; while (sp<=lp);
}
/*now insert `,' and append file name */
*tp++ = ',';
lp = rindex(sp, RCSSEP);
while (sp<lp) *tp++ = *sp++;
*tp++ = ','; *tp++ = '\0'; /* will be the same length as RCSname*/
madesema = false;
if (access(semafilename, 0) == 0) {
error("RCS file %s is in use",RCSname);
return false;
}
if (makesema) {
if ((fdesc=creat(semafilename, 000)) == -1) {
error("Can't create semaphore file for RCS file %s",RCSname);
return false;
} else
VOID close(fdesc);
madesema=true;
}
return true;
}
rmsema()
/* Function: delete the semaphore file if madeseam==true;
* sets madesema to false.
*/
{
if (madesema) {
madesema=false;
if (unlink(semafilename) == -1) {
error("Can't find semaphore file %s",semafilename);
}
}
}
InitCleanup()
{ freefilename = 0; /* initialize pointer */
}
cleanup()
/* Function: closes input file and rewrite file.
* Unlinks files in tfnames[], deletes semaphore file.
*/
{
register int i;
if (finptr!=NULL) VOID fclose(finptr);
if (frewrite!=NULL) VOID fclose(frewrite);
for (i=0; i<freefilename; i++) {
if (tfnames[i][0]!='\0') VOID unlink(tfnames[i]);
}
InitCleanup();
rmsema();
}
char * mktempfile(fullpath,filename)
register char * fullpath, * filename;
/* Function: Creates a unique filename using the process id and stores it
* into a free slot in tfnames. The filename consists of the path contained
* in fullpath concatenated with filename. filename should end in "XXXXXX".
* Because of storage in tfnames, cleanup() can unlink the file later.
* freefilename indicates the lowest unoccupied slot in tfnames.
* Returns a pointer to the filename created.
* Example use: mktempfile("/tmp/", somefilename)
*/
{
register char * lastslash, *tp;
if ((tp=tfnames[freefilename])==nil)
tp=tfnames[freefilename] = talloc(NCPPN);
if (fullpath!=nil && (lastslash=rindex(fullpath,'/'))!=0) {
/* copy path */
while (fullpath<=lastslash) *tp++ = *fullpath++;
}
while (*tp++ = *filename++);
return (mktemp(tfnames[freefilename++]));
}
char * bindex(sp,c)
register char * sp, c;
/* Function: Finds the last occurrence of character c in string sp
* and returns a pointer to the character just beyond it. If the
* character doesn't occur in the string, sp is returned.
*/
{ register char * r;
r = sp;
while (*sp) {
if (*sp++ == c) r=sp;
}
return r;
}
InitAdmin()
/* function: initializes an admin node */
{ register char * Suffix;
register int i;
Head=Dbranch=nil; AccessList=nil; Symbols=nil; Locks=nil;
StrictLocks=STRICT_LOCKING;
/* guess the comment leader from the suffix*/
Suffix=bindex(workfilename, '.');
if (Suffix==workfilename) Suffix= ""; /* empty suffix; will get default*/
for (i=0;;i++) {
if (comtable[i].suffix==nil) {
Comment=comtable[i].comlead; /*default*/
break;
} elsif (strcmp(Suffix,comtable[i].suffix)==0) {
Comment=comtable[i].comlead; /*default*/
break;
}
}
Lexinit(); /* Note: if finptr==NULL, reads nothing; only initializes*/
}
char * findpairfile(argc, argv, fname)
int argc; char * argv[], *fname;
/* Function: Given a filename fname, findpairfile scans argv for a pathname
* ending in fname. If found, returns a pointer to the pathname, and sets
* the corresponding pointer in argv to nil. Otherwise returns fname.
* argc indicates the number of entries in argv. Some of them may be nil.
*/
{
register char * * next, * match;
register int count;
for (next = argv, count = argc; count>0; next++,count--) {
if ((*next != nil) && strcmp(bindex(*next,'/'),fname)==0) {
/* bindex finds the beginning of the file name stem */
match= *next;
*next=nil;
return match;
}
}
return fname;
}
int pairfilenames(argc, argv, mustread, tostdout)
int argc; char ** argv; int mustread, tostdout;
/* Function: Pairs the filenames pointed to by argv; argc indicates
* how many there are.
* Places a pointer to the RCS filename into RCSfilename,
* and a pointer to the name of the working file into workfilename.
* If both the workfilename and the RCS filename are given, and tostdout
* is true, a warning is printed.
*
* If the working file exists, places its status into workstat and
* sets haveworkstat to 0; otherwise, haveworkstat is set to -1;
* Similarly for the RCS file and the variables RCSstat and haveRCSstat.
*
* If the RCS file exists, it is opened for reading, the file pointer
* is placed into finptr, and the admin-node is read in; returns 1.
* If the RCS file does not exist and mustread==true, an error is printed
* and 0 returned.
* If the RCS file does not exist and mustread==false, the admin node
* is initialized to empty (Head, AccessList, Locks, Symbols, StrictLocks, Dbranch)
* and -1 returned.
*
* 0 is returned on all errors. Files that are directories are errors.
* Also calls InitCleanup();
*/
{
register char * sp, * tp;
char * lastsep, * purefname, * pureRCSname;
int opened, returncode;
char * RCS1;
char prefdir[NCPPN];
if (*argv == nil) return 0; /* already paired filename */
if (rindex(*argv,KDELIM)!=0) {
/* KDELIM causes havoc in keyword expansion */
error("RCS file name may not contain %c",KDELIM);
return 0;
}
InitCleanup();
/* first check suffix to see whether it is an RCS file or not */
purefname=bindex(*argv, '/'); /* skip path */
lastsep=rindex(purefname, RCSSEP);
if (lastsep!= 0 && *(lastsep+1)==RCSSUF && *(lastsep+2)=='\0') {
/* RCS file name given*/
RCS1=(*argv); pureRCSname=purefname;
/* derive workfilename*/
sp = purefname; tp=tempfilename;
while (sp<lastsep) *tp++ = *sp++; *tp='\0';
/* try to find workfile name among arguments */
workfilename=findpairfile(argc-1,argv+1,tempfilename);
if (strlen(pureRCSname)>NCPFN) {
error("RCS file name %s too long",RCS1);
return 0;
}
} else {
/* working file given; now try to find RCS file */
workfilename= *argv;
/* derive RCS file name*/
sp=purefname; tp=tempfilename;
while (*tp++ = *sp++);
*(tp-1)=RCSSEP; *tp++=RCSSUF; *tp++='\0';
/* Try to find RCS file name among arguments*/
RCS1=findpairfile(argc-1,argv+1,tempfilename);
pureRCSname=bindex(RCS1, '/');
if (strlen(pureRCSname)>NCPFN) {
error("working file name %s too long",workfilename);
return 0;
}
}
/* now we have a (tentative) RCS filename in RCS1 and workfilename */
/* First, get status of workfilename */
haveworkstat=stat(workfilename, &workstat);
if ((haveworkstat==0) && ((workstat.st_mode & S_IFDIR) == S_IFDIR)) {
diagnose("Directory %s ignored",workfilename);
return 0;
}
/* Second, try to find the right RCS file */
if (pureRCSname!=RCS1) {
/* a path for RCSfile is given; single RCS file to look for */
finptr=fopen(RCSfilename=RCS1, "r");
if (finptr!=NULL) {
returncode=1;
} else { /* could not open */
if (access(RCSfilename,0)==0) {
error("Can't open existing %s", RCSfilename);
return 0;
}
if (mustread) {
error("Can't find %s", RCSfilename);
return 0;
} else {
/* initialize if not mustread */
returncode = -1;
}
}
} else {
/* no path for RCS file name. Prefix it with path of work */
/* file if RCS file omitted. Make a second name including */
/* RCSDIR and try to open that one first. */
sub1filename[0]=sub2filename[0]= '\0';
if (RCS1==tempfilename) {
/* RCS file name not given; prepend work path */
sp= *argv; tp= sub1filename;
while (sp<purefname) *tp++ = *sp ++;
*tp='\0';
VOID strcpy(sub2filename,sub1filename); /* second one */
}
VOID strcat(sub1filename,RCSDIR);
VOID strcpy(prefdir,sub1filename); /* preferred directory for RCS file*/
VOID strcat(sub1filename,RCS1); VOID strcat(sub2filename,RCS1);
opened=(
((finptr=fopen(RCSfilename=sub1filename, "r"))!=NULL) ||
((finptr=fopen(RCSfilename=sub2filename,"r"))!=NULL) );
if (opened) {
/* open succeeded */
returncode=1;
} else {
/* open failed; may be read protected */
if ((access(RCSfilename=sub1filename,0)==0) ||
(access(RCSfilename=sub2filename,0)==0)) {
error("Can't open existing %s",RCSfilename);
return 0;
}
if (mustread) {
error("Can't find %s nor %s",sub1filename,sub2filename);
return 0;
} else {
/* initialize new file. Put into ./RCS if possible, strip off suffix*/
RCSfilename= (access(prefdir,0)==0)?sub1filename:sub2filename;
returncode= -1;
}
}
}
if (returncode == 1) { /* RCS file open */
haveRCSstat=fstat(fileno(finptr),&RCSstat);
if ((haveRCSstat== 0) && ((RCSstat.st_mode & S_IFDIR) == S_IFDIR)) {
diagnose("Directory %s ignored",RCSfilename);
return 0;
}
Lexinit(); getadmin();
} else { /* returncode == -1; RCS file nonexisting */
haveRCSstat = -1;
InitAdmin();
};
if (tostdout&&
!(RCS1==tempfilename||workfilename==tempfilename))
/*The last term determines whether a pair of */
/* file names was given in the argument list */
warn("Option -p is set; ignoring output file %s",workfilename);
return returncode;
}
char * getfullRCSname()
/* Function: returns a pointer to the full path name of the RCS file.
* Calls getwd(), but only once.
* removes leading "../" and "./".
*/
{ static char pathbuf[NCPPN];
static char namebuf[NCPPN];
static int pathlength;
register char * realname, * lastpathchar;
register int dotdotcounter, realpathlength;
if (*RCSfilename=='/') {
return(RCSfilename);
} else {
if (pathlength==0) { /*call curdir for the first time*/
if (getwd(pathbuf)==NULL)
faterror("Can't build current directory path");
pathlength=strlen(pathbuf);
if (!((pathlength==1) && (pathbuf[0]=='/'))) {
pathbuf[pathlength++]='/';
/* Check needed because some getwd implementations */
/* generate "/" for the root. */
}
}
/*the following must be redone since RCSfilename may change*/
/* find how many ../ to remvove from RCSfilename */
dotdotcounter =0;
realname = RCSfilename;
while( realname[0]=='.' &&
(realname[1]=='/'||(realname[1]=='.'&&realname[2]=='/'))){
if (realname[1]=='/') {
/* drop leading ./ */
realname += 2;
} else {
/* drop leading ../ and remember */
dotdotcounter++;
realname += 3;
}
}
/* now remove dotdotcounter trailing directories from pathbuf*/
lastpathchar=pathbuf + pathlength-1;
while (dotdotcounter>0 && lastpathchar>pathbuf) {
/* move pointer backwards over trailing directory */
lastpathchar--;
if (*lastpathchar=='/') {
dotdotcounter--;
}
}
if (dotdotcounter>0) {
error("Can't generate full path name for RCS file");
return RCSfilename;
} else {
/* build full path name */
realpathlength=lastpathchar-pathbuf+1;
VOID strncpy(namebuf,pathbuf,realpathlength);
VOID strcpy(&namebuf[realpathlength],realname);
return(namebuf);
}
}
}
int trydiraccess(filename)
char * filename;
/* checks write permission in directory of filename and returns
* true if writable, false otherwise
*/
{
char pathname[NCPPN];
register char * tp, *sp, *lp;
lp = rindex(filename,'/');
if (lp==0) {
/* check current directory */
if (access(".",2)==0)
return true;
else {
error("Current directory not writable");
return false;
}
}
/* copy path */
sp=filename;
tp=pathname;
do *tp++ = *sp++; while (sp<=lp);
*tp='\0';
if (access(pathname,2)==0)
return true;
else {
error("Directory %s not writable", pathname);
return false;
}
}
#ifndef V4_2BSD
/* rename() and getwd() will be provided in bsd 4.2 */
int rename(from, to)
char * from, *to;
/* Function: renames a file with the name given by from to the name given by to.
* unlinks the to-file if it already exists. returns -1 on error, 0 otherwise.
*/
{ VOID unlink(to); /* no need to check return code; will be caught by link*/
/* no harm done if file "to" does not exist */
if (link(from,to)<0) return -1;
return(unlink(from));
}
#define dot "."
#define dotdot ".."
char * getwd(name)
char * name;
/* Function: places full pathname of current working directory into name and
* returns name on success, NULL on failure.
* getwd is an adaptation of pwd. May not return to the current directory on
* failure.
*/
{
FILE *file;
struct stat d, dd;
char buf[2]; /* to NUL-terminate dir.d_name */
struct direct dir;
int rdev, rino;
int off;
register i,j;
name[off= 0] = '/';
name[1] = '\0';
buf[0] = '\0';
if (stat("/", &d)<0) return NULL;
rdev = d.st_dev;
rino = d.st_ino;
for (;;) {
if (stat(dot, &d)<0) return NULL;
if (d.st_ino==rino && d.st_dev==rdev) {
if (name[off] == '/') name[off] = '\0';
chdir(name); /*change back to current directory*/
return name;
}
if ((file = fopen(dotdot,"r")) == NULL) return NULL;
if (fstat(fileno(file), &dd)<0) goto fail;
chdir(dotdot);
if(d.st_dev == dd.st_dev) {
if(d.st_ino == dd.st_ino) {
if (name[off] == '/') name[off] = '\0';
chdir(name); /*change back to current directory*/
VOID fclose(file);
return name;
}
do {
if (fread((char *)&dir, sizeof(dir), 1, file) !=1)
goto fail;
} while (dir.d_ino != d.st_ino);
}
else do {
if(fread((char *)&dir, sizeof(dir), 1, file) != 1) {
goto fail;
}
if (dir.d_ino == 0)
dd.st_ino = d.st_ino + 1;
else if (stat(dir.d_name, &dd) < 0)
goto fail;
} while(dd.st_ino != d.st_ino || dd.st_dev != d.st_dev);
VOID fclose(file);
/* concatenate file name */
i = -1;
while (dir.d_name[++i] != 0);
for(j=off+1; j>0; --j)
name[j+i+1] = name[j];
off=i+off+1;
name[i+1] = '/';
for(--i; i>=0; --i)
name[i+1] = dir.d_name[i];
} /* end for */
fail: VOID fclose(file);
return NULL;
}
#endif
#ifdef PAIRTEST
/* test program for pairfilenames() and getfullRCSname() */
char * workfilename, *RCSfilename;
extern int quietflag;
main(argc, argv)
int argc; char *argv[];
{
int result;
int initflag,tostdout;
quietflag=tostdout=initflag=false;
cmdid="pair";
while(--argc, ++argv, argc>=1 && ((*argv)[0] == '-')) {
switch ((*argv)[1]) {
case 'p': tostdout=true;
break;
case 'i': initflag=true;
break;
case 'q': quietflag=true;
break;
default: error("unknown option: %s", *argv);
break;
}
}
do {
RCSfilename=workfilename=nil;
result=pairfilenames(argc,argv,!initflag,tostdout);
if (result!=0) {
diagnose("RCSfile: %s; working file: %s",RCSfilename,workfilename);
diagnose("Full RCS file name: %s", getfullRCSname());
}
switch (result) {
case 0: continue; /* already paired file */
case 1: if (initflag) {
error("RCS file %s exists already",RCSfilename);
} else {
diagnose("RCS file %s exists",RCSfilename);
}
VOID fclose(finptr);
break;
case -1:diagnose("RCS file does not exist");
break;
}
} while (++argv, --argc>=1);
}
#endif