src/input.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1997-2005
   5  *      Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kenneth Almquist.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)input.h     8.2 (Berkeley) 5/4/95
  35  */
  36
  37 /* PEOF (the end of file marker) is defined in syntax.h */
  38
  39 enum {
  40         INPUT_PUSH_FILE = 1,
  41         INPUT_NOFILE_OK = 2,
  42 };
  43
  44 struct alias;
  45
  46 struct strpush {
  47         struct strpush *prev;   /* preceding string on stack */
  48         char *prevstring;
  49         int prevnleft;
  50         struct alias *ap;       /* if push was associated with an alias */
  51         char *string;           /* remember the string since it may change */
  52 };
  53
  54 /*
  55  * The parsefile structure pointed to by the global variable parsefile
  56  * contains information about the current file being read.
  57  */
  58
  59 struct parsefile {
  60         struct parsefile *prev; /* preceding file on stack */
  61         int linno;              /* current line */
  62         int fd;                 /* file descriptor (or -1 if string) */
  63         int nleft;              /* number of chars left in this line */
  64         int lleft;              /* number of chars left in this buffer */
  65         char *nextc;            /* next char in buffer */
  66         char *buf;              /* input buffer */
  67         struct strpush *strpush; /* for pushing strings at this level */
  68         struct strpush basestrpush; /* so pushing one is fast */
  69 };
  70
  71 extern struct parsefile *parsefile;
  72
  73 /*
  74  * The input line number.  Input.c just defines this variable, and saves
  75  * and restores it when files are pushed and popped.  The user of this
  76  * package must set its value.
  77  */
  78 #define plinno (parsefile->linno)
  79
  80 int pgetc(void);
  81 int pgetc2(void);
  82 void pungetc(void);
  83 void pushstring(char *, void *);
  84 void popstring(void);
  85 int setinputfile(const char *, int);
  86 void setinputstring(char *);
  87 void popfile(void);
  88 void popallfiles(void);
  89 void closescript(void);