sh/input.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)input.h     8.2 (Berkeley) 5/4/95
  33  * $FreeBSD$
  34  */
  35
  36 /* PEOF (the end of file marker) is defined in syntax.h */
  37
  38 /*
  39  * The input line number.  Input.c just defines this variable, and saves
  40  * and restores it when files are pushed and popped.  The user of this
  41  * package must set its value.
  42  */
  43 extern int plinno;
  44 extern int parsenleft;          /* number of characters left in input buffer */
  45 extern const char *parsenextc;  /* next character in input buffer */
  46
  47 struct alias;
  48 struct parsefile;
  49
  50 void resetinput(void);
  51 int pgetc(void);
  52 int preadbuffer(void);
  53 int preadateof(void);
  54 void pungetc(void);
  55 void pushstring(const char *, int, struct alias *);
  56 void setinputfile(const char *, int);
  57 void setinputfd(int, int);
  58 void setinputstring(const char *, int);
  59 void popfile(void);
  60 struct parsefile *getcurrentfile(void);
  61 void popfilesupto(struct parsefile *);
  62 void popallfiles(void);
  63 void closescript(void);
  64
  65 #define pgetc_macro()   (--parsenleft >= 0? *parsenextc++ : preadbuffer())