+/*
+ * 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
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