4.3BSD/usr/contrib/rcs/src/rcsfnms.c
/*
* RCS file name handling
*/
static char rcsid[]=
"$Header: rcsfnms.c,v 3.9 86/05/15 02:24:55 lepreau Exp $ Purdue CS";
/****************************************************************************
* 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 by Walter F. Tichy
* Purdue University
* Computer Science Department
* West Lafayette, IN 47907
*
* All rights reserved. No part of this software may be sold or distributed
* in any form or by any means without the prior written permission of the
* author.
* Report problems and direct all inquiries to Tichy@purdue (ARPA net).
*/
/* $Log: rcsfnms.c,v $
* Revision 3.9 86/05/15 02:24:55 lepreau
* add suffix .el for gnulisp
*
* Revision 3.8 86/01/12 01:20:29 lepreau
* add suffixes csh,cl,sl,red for csh, common lisp,
* psl, and rlisp respectively.
*
* Revision 3.7 83/05/11 15:01:58 wft
* *** empty log message ***
*
* 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; lastfilename 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"
extern char * rindex();
extern char * mktemp();
extern char * malloc();
extern FILE * fopen();
extern char * getwd(); /* get working directory; forward decl */
extern FILE * finptr; /* RCS input file descriptor */
extern FILE * frewrite; /* New RCS file descriptor */
extern char * RCSfilename, * workfilename; /* filenames */
char tempfilename [NCPFN+10]; /* used for derived file names */
char subfilename [NCPFN+14]; /* used for files 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 */
{nil,nil,nil,nil,nil,nil,nil,nil,nil,nil};
int lastfilename = -1;/* index of last 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 */
"h", " * ", /* C-header */
"p", " * ", /* pascal */
"sh", "# ", /* shell */
"csh", "# ", /* shell */
"s", "# ", /* assembler */
"sl", "% ", /* psl */
"red", "% ", /* psl/rlisp */
"cl", ";;; ", /* common lisp */
"r", "# ", /* ratfor */
"e", "# ", /* efl */
"l", " * ", /* lex NOTE: conflict between lex and franzlisp*/
"y", " * ", /* yacc */
"yr", " * ", /* yacc-ratfor */
"ye", " * ", /* yacc-efl */
"ml", "; ", /* mocklisp */
"el", "; ", /* gnulisp */
"mac", "; ", /* macro vms or dec-20 or pdp-11 macro */
"f", "c ", /* fortran */
"ms", "\\\" ", /* ms-macros t/nroff*/
"me", "\\\" ", /* me-macros t/nroff*/
"", "# ", /* 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(RCSfilename,makesema)
char * RCSfilename; int makesema;
/* Function: Checks whether a semaphore file exists for RCSfilename. 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=RCSfilename;
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 RCSfilename*/
madesema = false;
if (access(semafilename, 0) == 0) {
error("RCS file %s is in use",RCSfilename);
return false;
}
if (makesema) {
if ((fdesc=creat(semafilename, 000)) == -1) {
error("Can't create semaphore file for RCS file %s",RCSfilename);
return false;
} else
close(fdesc);
madesema=true;
}
return true;
}
int 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);
return false;
}
}
return true;
}
InitCleanup()
{ lastfilename = -1; /* initialize pointer */
}
cleanup()
/* Function: closes input file and rewrite file.
* Unlinks files in tfnames[], deletes semaphore file.
*/
{
register int i;
if (finptr!=NULL) fclose(finptr);
if (frewrite!=NULL) fclose(frewrite);
for (i=0; i<=lastfilename; i++) {
if (tfnames[i][0]!='\0') unlink(tfnames[i]);
}
InitCleanup();
return (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.
* lastfilename indicates the highest occupied slot in tfnames.
* Returns a pointer to the filename created.
* Example use: mktempfile("/tmp/", somefilename)
*/
{
register char * lastslash, *tp;
lastfilename++;
if ((tp=tfnames[lastfilename])==nil)
tp=tfnames[lastfilename] = malloc(NCPPN);
if (fullpath!=nil && (lastslash=rindex(fullpath,'/'))!=0) {
/* copy path */
while (fullpath<=lastslash) *tp++ = *fullpath++;
}
while (*tp++ = *filename++);
return (mktemp(tfnames[lastfilename]));
}
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=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 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),
* and -1 returned.
*
* 0 is returned on all errors.
* Also calls InitCleanup();
*/
{
register char * sp, * tp;
char * lastsep, * purefname, * pureRCSname;
int opened, returncode;
char * RCS1;
if (*argv == nil) return 0; /* already paired filename */
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 */
if (pureRCSname!=RCS1) {
/* a path for RCSfile is given; single RCS file to look for */
finptr=fopen(RCSfilename=RCS1, "r");
if (finptr!=NULL) {
Lexinit(); getadmin();
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 */
InitAdmin();
returncode = -1;
}
}
} else {
/* build second RCS file name by prefixing it with RCSDIR*/
/* then try to open one of them */
strcpy(subfilename,RCSDIR); strcat(subfilename,RCS1);
opened=(
((finptr=fopen(RCSfilename=subfilename, "r"))!=NULL) ||
((finptr=fopen(RCSfilename=RCS1,"r"))!=NULL) );
if (opened) {
/* open succeeded */
Lexinit(); getadmin();
returncode=1;
} else {
/* open failed; may be read protected */
if ((access(RCSfilename=subfilename,0)==0) ||
(access(RCSfilename=RCS1,0)==0)) {
error("Can't open existing %s",RCSfilename);
return 0;
}
if (mustread) {
error("Can't find %s nor %s",subfilename,RCS1);
return 0;
} else {
/* initialize new file. Put into ./RCS if possible, strip off suffix*/
RCSfilename= (access(RCSDIR,0)==0)?subfilename:RCS1;
InitAdmin();
returncode= -1;
}
}
}
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 =0;
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;
strncpy(namebuf,pathbuf,realpathlength);
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.
*/
{ 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));
}
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/dir.h>
#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';
stat("/", &d);
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*/
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;
}
stat(dir.d_name, &dd);
} while(dd.st_ino != d.st_ino || dd.st_dev != d.st_dev);
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: fclose(file);
return NULL;
}
#endif
#ifdef PAIRTEST
/* test program for pairfilenames() and getfullRCSname() */
char * workfilename, *RCSfilename;
main(argc, argv)
int argc; char *argv[];
{
int result;
int initflag,tostdout;
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;
}
}
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 exists already");
continue;
} else {
diagnose("RCS file exists");
}
break;
case -1:diagnose("RCS file does not exist");
break;
}
} while (++argv, --argc>=1);
}
#endif