4.3BSD - /usr/src/new/rcs/src/rcsfcmp.c

   1: /*
   2:  *                     RCS file comparison
   3:  */
   4:  static char rcsid[]=
   5:  "$Header: /usr/wft/RCS/SRC/RCS/rcsfcmp.c,v 3.1 82/12/04 13:21:40 wft Exp $ Purdue CS";
   6: /*****************************************************************************
   7:  *                       rcsfcmp()
   8:  *                       Testprogram: define FCMPTEST
   9:  *****************************************************************************
  10:  *
  11:  * Copyright (C) 1982 by Walter F. Tichy
  12:  *                       Purdue University
  13:  *                       Computer Science Department
  14:  *                       West Lafayette, IN 47907
  15:  *
  16:  * All rights reserved. No part of this software may be sold or distributed
  17:  * in any form or by any means without the prior written permission of the
  18:  * author.
  19:  * Report problems and direct all inquiries to Tichy@purdue (ARPA net).
  20:  */
  21: 
  22: 
  23: 
  24: /* $Log:	rcsfcmp.c,v $
  25:  * Revision 3.1  82/12/04  13:21:40  wft
  26:  * Initial revision.
  27:  *
  28:  */
  29: 
  30: /*
  31: #define FCMPTEST
  32: /* Testprogram; prints out whether two files are identical,
  33:  * except for keywords
  34:  */
  35: 
  36: #include  "rcsbase.h"
  37: extern FILE * fopen();
  38: 
  39: 
  40: rcsfcmp(xfname,uxfname,delta)
  41: char * xfname, *uxfname; struct hshentry *delta;
  42: /* Function: compares the files xfname and uxfname. Returns true
  43:  * if xfname has the same contents as uxfname, while disregarding
  44:  * keyword values. For the LOG-keyword, rcsfcmp skips the log message
  45:  * given by the parameter delta in xfname. Thus, rcsfcmp returns true
  46:  * if xfname contains the same as uxfname, with the keywords expanded.
  47:  */
  48: {
  49:     register int xc,uxc;
  50:     char xkeyword[keylength+2], uxkeyword[keylength+2];
  51:     register char * tp;
  52:     FILE * xfp, * uxfp;
  53:     int result;
  54: 
  55:     if ((xfp=fopen(tp=xfname,"r"))==NULL || (uxfp=fopen(tp=uxfname,"r"))==NULL) {
  56:        faterror("Can't open %s\n", tp);
  57:        return false;
  58:     }
  59:     result=false;
  60:     xc=getc(xfp); uxc=getc(uxfp);
  61:     while( xc == uxc) { /* comparison loop */
  62:         if (xc==EOF) { /* finished; everything is the same*/
  63:             result=true;
  64:             break;
  65:         }
  66:         if ( xc!=KDELIM) {
  67:             /* get the next characters */
  68:             xc=getc(xfp); uxc=getc(uxfp);
  69:         } else {
  70:             /* try to get both keywords */
  71:             tp = xkeyword;
  72:             while( ctab[(xc=getc(xfp))]==LETTER && tp< xkeyword+keylength)
  73:                 *tp++ = xc;
  74:             *tp='\0';
  75:             tp = uxkeyword;
  76:             while( ctab[(uxc=getc(uxfp))]==LETTER && tp< uxkeyword+keylength)
  77:                 *tp++ = uxc;
  78:             *tp='\0';
  79:             /* now we have 2 keywords, or something thal looks like it.*/
  80:             if (strcmp(xkeyword,uxkeyword)!=0) break; /* not the same! */
  81:             /* now check whether it's really a keyword */
  82:             if (!(strcmp(xkeyword,AUTHOR)==0 || strcmp(xkeyword,DATE)    ==0 ||
  83:                   strcmp(xkeyword,HEADER)==0 || strcmp(xkeyword,LOCKER)  ==0 ||
  84:                   strcmp(xkeyword,LOG)   ==0 || strcmp(xkeyword,REVISION)==0 ||
  85:                   strcmp(xkeyword,SOURCE)==0 || strcmp(xkeyword,STATE)   ==0 )) {
  86:                 /* it's not a keyword, so continue normally */
  87:                 continue;
  88:             } else {
  89:                 /* it's a keyword, so skip value */
  90:                 while (xc!=KDELIM && xc!='\n' && xc!=EOF) xc=getc(xfp);
  91:                 while (uxc!=KDELIM && uxc!='\n' && uxc!=EOF) uxc=getc(uxfp);
  92:                 if (xc==uxc && xc==KDELIM) {
  93:                     xc=getc(xfp); uxc=getc(uxfp); /* skip KDELIM */
  94:                     /* if the keyword is LOG, also skip the log message in xfp*/
  95:                     if (strcmp(xkeyword,LOG)==0) {
  96:                         /* first, compute the number of line feeds in log msg */
  97:                         int lncnt;
  98:                         lncnt=2; tp=delta->log;
  99:                         while(*tp) if(*tp++=='\n') lncnt++;
 100:                         while(xc!=EOF) {
 101:                             if (xc=='\n')
 102:                                 if(--lncnt==0) break;
 103:                             xc=getc(xfp);
 104:                         }
 105:                         /* skip last comment leader */
 106:                         for (lncnt=strlen(Comment); lncnt>=0; lncnt--) xc=getc(xfp);
 107:                     }
 108:                 }
 109:             }
 110:         }
 111:     }
 112:     fclose(xfp);fclose(uxfp);
 113:     return result;
 114: }
 115: 
 116: 
 117: 
 118: #ifdef FCMPTEST
 119: cleanup(){} /* dummy */
 120: 
 121: char * Comment;
 122: 
 123: main(argc, argv)
 124: int  argc; char  *argv[];
 125: /* first argument: comment leader; 2nd: log message, 3rd: expanded file,
 126:  * 4th: unexpanded file
 127:  */
 128: {       struct hshentry delta;
 129: 
 130:         cmdid="rcsfcmp";
 131:         Comment=argv[1];
 132:         delta.log=argv[2];
 133:         if (rcsfcmp(argv[3],argv[4],&delta))
 134:                 printf("files are the same\n");
 135:         else    printf("files are different\n");
 136: }
 137: #endif

Defined functions

Defined variables