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
39enum {
40	INPUT_PUSH_FILE = 1,
41	INPUT_NOFILE_OK = 2,
42};
43
44struct alias;
45
46struct 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	/* Remember last two characters for pungetc. */
54	int lastc[2];
55
56	/* Number of outstanding calls to pungetc. */
57	int unget;
58};
59
60/*
61 * The parsefile structure pointed to by the global variable parsefile
62 * contains information about the current file being read.
63 */
64
65struct parsefile {
66	struct parsefile *prev;	/* preceding file on stack */
67	int linno;		/* current line */
68	int fd;			/* file descriptor (or -1 if string) */
69	int nleft;		/* number of chars left in this line */
70	int lleft;		/* number of chars left in this buffer */
71	char *nextc;		/* next char in buffer */
72	char *buf;		/* input buffer */
73	struct strpush *strpush; /* for pushing strings at this level */
74	struct strpush basestrpush; /* so pushing one is fast */
75
76	/* Remember last two characters for pungetc. */
77	int lastc[2];
78
79	/* Number of outstanding calls to pungetc. */
80	int unget;
81};
82
83extern struct parsefile *parsefile;
84
85/*
86 * The input line number.  Input.c just defines this variable, and saves
87 * and restores it when files are pushed and popped.  The user of this
88 * package must set its value.
89 */
90#define plinno (parsefile->linno)
91
92int pgetc(void);
93int pgetc2(void);
94void pungetc(void);
95void pushstring(char *, void *);
96void popstring(void);
97int setinputfile(const char *, int);
98void setinputstring(char *);
99void popfile(void);
100void popallfiles(void);
101void closescript(void);
102