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         /* Delay freeing so we can stop nested aliases. */
  54         struct strpush *spfree;
  55
  56         /* Remember last two characters for pungetc. */
  57         int lastc[2];
  58
  59         /* Number of outstanding calls to pungetc. */
  60         int unget;
  61 };
  62
  63 /*
  64  * The parsefile structure pointed to by the global variable parsefile
  65  * contains information about the current file being read.
  66  */
  67
  68 struct parsefile {
  69         struct parsefile *prev; /* preceding file on stack */
  70         int linno;              /* current line */
  71         int fd;                 /* file descriptor (or -1 if string) */
  72         int nleft;              /* number of chars left in this line */
  73         int lleft;              /* number of chars left in this buffer */
  74         char *nextc;            /* next char in buffer */
  75         char *buf;              /* input buffer */
  76         struct strpush *strpush; /* for pushing strings at this level */
  77         struct strpush basestrpush; /* so pushing one is fast */
  78
  79         /* Delay freeing so we can stop nested aliases. */
  80         struct strpush *spfree;
  81
  82         /* Remember last two characters for pungetc. */
  83         int lastc[2];
  84
  85         /* Number of outstanding calls to pungetc. */
  86         int unget;
  87 };
  88
  89 extern struct parsefile *parsefile;
  90
  91 /*
  92  * The input line number.  Input.c just defines this variable, and saves
  93  * and restores it when files are pushed and popped.  The user of this
  94  * package must set its value.
  95  */
  96 #define plinno (parsefile->linno)
  97
  98 int pgetc(void);
  99 int pgetc2(void);
 100 void pungetc(void);
 101 void pushstring(char *, void *);
 102 int setinputfile(const char *, int);
 103 void setinputstring(char *);
 104 void popfile(void);
 105 void unwindfiles(struct parsefile *);
 106 void popallfiles(void);