/* * RCS revision generation */ static char rcsid[]= "$Header: rcsgen.c,v 3.4 86/05/15 02:18:42 lepreau Exp $ Purdue CS"; /********************************************************************************* ********************************************************************************* * * 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: rcsgen.c,v $ * Revision 3.4 86/05/15 02:18:42 lepreau * Fix immediate EOF from non-tty files: avoid 0377's in description. * * Revision 3.3 82/11/28 21:36:49 wft * *** empty log message *** * * Revision 3.3 82/11/28 21:36:49 wft * Replaced ferror() followed by fclose() with ffclose(). * Putdesc() now suppresses the prompts if stdin * is not a terminal. A pointer to the current log message is now * inserted into the corresponding delta, rather than leaving it in a * global variable. * * Revision 3.2 82/10/18 21:11:26 wft * I added checks for write errors during editing, and improved * the prompt on putdesc(). * * Revision 3.1 82/10/13 15:55:09 wft * corrected type of variables assigned to by getc (char --> int) */ #include "rcsbase.h" extern struct hshentry * getnum(); extern char * mktemp(); extern FILE * fopen(); extern savestring(); extern struct hshentry * genrevs(); extern editstring(); extern int nextc; /* next character from lexical analyzer */ extern char * RCSfilename, * workfilename; extern struct hshentry * targetdelta; /* delta to be generated */ extern char * Ktext; /* keywords from syntax analyzer */ extern char * Klog; /* Keyword "log" */ extern char * Kdesc; /* Keyword for description */ extern FILE * finptr; /* RCS input file */ extern FILE * frewrite; /* new RCS file */ extern FILE * fcopy; /* result file during editing */ extern FILE * fedit; /* edit file */ extern char * resultfile, *editfile;/* file names for fcopy and fedit */ extern int rewriteflag; /* indicates whether to rewrite the input file */ char curlogmsg[logsize] /* buffer for current log message */ ='\0'; enum stringwork {copy, edit, expand, edit_expand }; /* parameter to scandeltatext() */ char * buildrevision(deltas, target, dir, expandflag) struct hshentry ** deltas, * target; char * dir; int expandflag; /* Function: Generates the revision given by target * by retrieving all deltas given by parameter deltas and combining them. * If dir==nil, the revision is printed on the standard output, * otherwise written into a temporary file in directory dir. * if expandflag==true, keyword expansion is performed. * returns false on errors, the name of the file with the revision otherwise. * * Algorithm: Copy inital revision unchanged. Then edit all revisions but * the last one into it, alternating input and output files (resultfile and * editfile). The last revision is then edited in, performing simultaneous * keyword substitution (this saves one extra pass). * All this simplifies if only one revision needs to be generated, * or no keyword expansion is necessary, or if output goes to stdout. */ { int i; if (deltas[0]==target) { /* only latest revision to generate */ if (dir==nil) {/* print directly to stdout */ fcopy=stdout; scandeltatext(target,expand); return(char *) true; } else { initeditfiles(dir); scandeltatext(target,expandflag?expand:copy); ffclose(fcopy); return(resultfile); } } else { /* several revisions to generate */ initeditfiles(dir?dir:"/tmp/"); /* write initial revision into fcopy, no keyword expansion */ scandeltatext(deltas[0],copy); i = 1; while (deltas[i+1] != nil) { /* do all deltas except last one */ scandeltatext(deltas[i++],edit); } if (!expandflag) { /* no keyword expansion; only invoked from ci */ scandeltatext(deltas[i],edit); finishedit(nil); ffclose(fcopy); } else { /* perform keyword expansion*/ /* first, get to beginning of file*/ finishedit(nil); swapeditfiles(dir==nil); scandeltatext(deltas[i],edit_expand); finishedit(deltas[i]); if (dir!=nil) ffclose(fcopy); } return(resultfile); /*doesn't matter for dir==nil*/ } } scandeltatext(delta,func) struct hshentry * delta; enum stringwork func; /* Function: Scans delta text nodes up to and including the one given * by delta. For the one given by delta, the log message is saved into * curlogmsg and the text is processed according to parameter func. * Assumes the initial lexeme must be read in first. * Does not advance nexttok after it is finished. */ { struct hshentry * nextdelta; do { nextlex(); if (!(nextdelta=getnum())) { fatserror("Can't find delta for revision %s", delta->num); } if (!getkey(Klog) || nexttok!=STRING) serror("Missing log entry"); elsif (delta==nextdelta) { savestring(curlogmsg,logsize); delta->log=curlogmsg; } else {readstring(); delta->log= ""; } nextlex(); if (!getkey(Ktext) || nexttok!=STRING) fatserror("Missing delta text"); if(delta==nextdelta) /* got the one we're looking for */ switch (func) { case copy: copystring(); break; case expand: xpandstring(delta); break; case edit: editstring(nil); break; case edit_expand: editstring(delta); break; } else readstring(); /* skip over it */ } while (delta!=nextdelta); } int putdesc(initflag,textflag,textfile,quietflag) int initflag,textflag; char * textfile; int quietflag; /* Function: puts the descriptive text into file frewrite. * if !initflag && !textflag, the text is simply copied from finptr. * Otherwise, if the textfile!=nil, the text is read from that * file, or from stdin, if textfile==nil. * if initflag&&quietflag&&!textflag, an empty text is inserted. * if !initflag, the old descriptive text is discarded. * Returns true is successful, false otherwise. */ { FILE * txt; register int c, old1, old2; if (!initflag && !textflag) { /* copy old description */ fprintf(frewrite,"\n\n%s%c",Kdesc,nextc); rewriteflag=true; getdesc(false); return true; } else { /* get new description */ if (!initflag) { /*skip old description*/ rewriteflag=false; getdesc(false); } fprintf(frewrite,"\n\n%s\n%c",Kdesc,SDELIM); if (textfile) { old1='\n'; /* copy textfile */ if ((txt=fopen(textfile,"r"))!=NULL) { while ((c=getc(txt))!=EOF) { if (c==SDELIM) putc(c,frewrite); /*double up*/ putc(c,frewrite); old1=c; } if (old1!='\n') putc('\n',frewrite); fclose(txt); putc(SDELIM,frewrite);fputs("\n\n", frewrite); return true; } else { error("Can't open file with description%s",textfile); } } if (initflag&&quietflag) { warn("empty descriptive text"); putc(SDELIM,frewrite);fputs("\n\n", frewrite); return true; } /* read text from stdin */ if (isatty(fileno(stdin))) { fputs("enter description, terminated with ^D or '.':\n",stdout); fputs("NOTE: This is NOT the log message!\n>> ",stdout); } c = '\0'; old2= '\n'; if ((old1=getchar())==EOF) { if (isatty(fileno(stdin))) { putc('\n',stdout); clearerr(stdin); } } else for (;;) { c=getchar(); if (c==EOF) { if (isatty(fileno(stdin))) { putc('\n',stdout); clearerr(stdin); } putc(old1,frewrite); if (old1!='\n') putc('\n',frewrite); break; } if (c=='\n' && old1=='.' && old2=='\n') { break; } if (c=='\n' && isatty(fileno(stdin))) fputs(">> ",stdout); if(old1==SDELIM) putc(old1,frewrite); /* double up*/ putc(old1,frewrite); old2=old1; old1=c; } /* end for */ putc(SDELIM,frewrite);fputs("\n\n",frewrite); return true; } }