/* Identify RCS keyword strings in files.  */

/* Copyright 1982, 1988, 1989 Walter Tichy
   Copyright 1990, 1991, 1992, 1993, 1994, 1995 Paul Eggert
   Distributed under license by the Free Software Foundation, Inc.

This file is part of RCS.

RCS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

RCS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with RCS; see the file COPYING.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

Report problems and direct all questions to:

    rcs-bugs@cs.purdue.edu

*/

/*
 * $Log: ident.c,v $
 * Revision 5.9  1995/06/16 06:19:24  eggert
 * Update FSF address.
 *
 * Revision 5.8  1995/06/01 16:23:43  eggert
 * (exiterr, reportError): New functions, needed for DOS and OS/2 ports.
 * (scanfile): Use them.
 *
 * Revision 5.7  1994/03/20 04:52:58  eggert
 * Remove `exiting' from identExit.
 *
 * Revision 5.6  1993/11/09 17:40:15  eggert
 * Add -V.
 *
 * Revision 5.5  1993/11/03 17:42:27  eggert
 * Test for char == EOF, not char < 0.
 *
 * Revision 5.4  1992/01/24  18:44:19  eggert
 * lint -> RCS_lint
 *
 * Revision 5.3  1991/09/10  22:15:46  eggert
 * Open files with FOPEN_R, not FOPEN_R_WORK,
 * because they might be executables, not working files.
 *
 * Revision 5.2  1991/08/19  03:13:55  eggert
 * Report read errors immediately.
 *
 * Revision 5.1  1991/02/25  07:12:37  eggert
 * Don't report empty keywords.  Check for I/O errors.
 *
 * Revision 5.0  1990/08/22  08:12:37  eggert
 * Don't limit output to known keywords.
 * Remove arbitrary limits and lint.  Ansify and Posixate.
 *
 * Revision 4.5  89/05/01  15:11:54  narten
 * changed copyright header to reflect current distribution rules
 * 
 * Revision 4.4  87/10/23  17:09:57  narten
 * added exit(0) so exit return code would be non random
 * 
 * Revision 4.3  87/10/18  10:23:55  narten
 * Updating version numbers. Changes relative to 1.1 are actually relative
 * to 4.1
 * 
 * Revision 1.3  87/07/09  09:20:52  trinkle
 * Added check to make sure there is at least one arg before comparing argv[1]
 * with "-q".  This necessary on machines that don't allow dereferncing null
 * pointers (i.e. Suns).
 * 
 * Revision 1.2  87/03/27  14:21:47  jenkins
 * Port to suns
 * 
 * Revision 4.1  83/05/10  16:31:02  wft
 * Added option -q and input from reading stdin.
 * Marker matching is now done with trymatch() (independent of keywords).
 * 
 * Revision 3.4  83/02/18  17:37:49  wft
 * removed printing of new line after last file.
 *
 * Revision 3.3  82/12/04  12:48:55  wft
 * Added LOCKER.
 *
 * Revision 3.2  82/11/28  18:24:17  wft
 * removed Suffix; added ungetc to avoid skipping over trailing KDELIM.
 *
 * Revision 3.1  82/10/13  15:58:51  wft
 * fixed type of variables receiving from getc() (char-->int).
*/

#include  "rcsbase.h"

static int match P((FILE*));
static int scanfile P((FILE*,char const*,int));
static void reportError P((char const*));

mainProg(identId, "ident", "$Id: ident.c,v 5.9 1995/06/16 06:19:24 eggert Exp $")
/*  Ident searches the named files for all occurrences
 *  of the pattern $@: text $ where @ is a keyword.
 */

{
   FILE *fp;
   int quiet = 0;
   int status = EXIT_SUCCESS;
   char const *a;

   while ((a = *++argv)  &&  *a=='-')
	while (*++a)
	    switch (*a) {
		case 'q':
		    quiet = 1;
		    break;

		case 'V':
		    VOID printf("RCS version %s\n", RCS_version_string);
		    quiet = -1;
		    break;

		default:
		    VOID fprintf(stderr,
			"ident: usage: ident -{qV} [file...]\n"
		    );
		    exitmain(EXIT_FAILURE);
		    break;
	    }

   if (0 <= quiet)
       if (!a)
	    VOID scanfile(stdin, (char*)0, quiet);
       else
	    do {
		if (!(fp = fopen(a, FOPEN_RB))) {
		    reportError(a);
		    status = EXIT_FAILURE;
		} else if (
		    scanfile(fp, a, quiet) != 0
		    || (argv[1]  &&  putchar('\n') == EOF)
		)
		    break;
	    } while ((a = *++argv));

   if (ferror(stdout) || fclose(stdout)!=0) {
      reportError("standard output");
      status = EXIT_FAILURE;
   }
   exitmain(status);
}

#if RCS_lint
#	define exiterr identExit
#endif
	void
exiterr()
{
	_exit(EXIT_FAILURE);
}

	static void
reportError(s)
	char const *s;
{
	int e = errno;
	VOID fprintf(stderr, "%s error: ", cmdid);
	errno = e;
	perror(s);
}


	static int
scanfile(file, name, quiet)
	register FILE *file;
	char const *name;
	int quiet;
/* Function: scan an open file with descriptor file for keywords.
 * Return -1 if there's a write error; exit immediately on a read error.
 */
{
   register int c;

   if (name) {
      VOID printf("%s:\n", name);
      if (ferror(stdout))
	 return -1;
   } else
      name = "standard input";
   c = 0;
   while (c != EOF  ||  ! (feof(file)|ferror(file))) {
      if (c == KDELIM) {
	 if ((c = match(file)))
	    continue;
	 if (ferror(stdout))
	    return -1;
	 quiet = true;
      }
      c = getc(file);
   }
   if (ferror(file) || fclose(file) != 0) {
      reportError(name);
      /*
      * The following is equivalent to exit(EXIT_FAILURE), but we invoke
      * exiterr to keep lint happy.  The DOS and OS/2 ports need exiterr.
      */
      VOID fflush(stderr);
      VOID fflush(stdout);
      exiterr();
   }
   if (!quiet)
      VOID fprintf(stderr, "%s warning: no id keywords in %s\n", cmdid, name);
   return 0;
}



	static int
match(fp)   /* group substring between two KDELIM's; then do pattern match */
   register FILE *fp;
{
   char line[BUFSIZ];
   register int c;
   register char * tp;

   tp = line;
   while ((c = getc(fp)) != VDELIM) {
      if (c == EOF  &&  feof(fp) | ferror(fp))
	 return c;
      switch (ctab[c]) {
	 case LETTER: case Letter:
	    *tp++ = c;
	    if (tp < line+sizeof(line)-4)
	       break;
	    /* fall into */
	 default:
	    return c ? c : '\n'/* anything but 0 or KDELIM or EOF */;
      }
   }
   if (tp == line)
      return c;
   *tp++ = c;
   if ((c = getc(fp)) != ' ')
      return c ? c : '\n';
   *tp++ = c;
   while( (c = getc(fp)) != KDELIM ) {
      if (c == EOF  &&  feof(fp) | ferror(fp))
	    return c;
      switch (ctab[c]) {
	 default:
	    *tp++ = c;
	    if (tp < line+sizeof(line)-2)
	       break;
	    /* fall into */
	 case NEWLN: case UNKN:
	    return c ? c : '\n';
      }
   }
   if (tp[-1] != ' ')
      return c;
   *tp++ = c;     /*append trailing KDELIM*/
   *tp   = '\0';
   VOID printf("     %c%s\n", KDELIM, line);
   return 0;
}
