| 1 | /* $NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | */
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| 34 |
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| 35 | #if 0
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| 36 | #ifndef lint
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| 37 | static char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95";
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| 38 | #else
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| 39 | __RCSID("$NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $");
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| 40 | #endif /* not lint */
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| 41 | #endif
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| 42 |
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| 43 | #include <stdio.h> /* defines BUFSIZ */
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| 44 | #include <errno.h>
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| 45 | #include <stdlib.h>
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| 46 | #include <string.h>
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| 47 |
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| 48 | /*
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| 49 | * This file implements the input routines used by the parser.
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| 50 | */
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| 51 |
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| 52 | #include "shell.h"
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| 53 | #include "redir.h"
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| 54 | #include "syntax.h"
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| 55 | #include "input.h"
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| 56 | #include "output.h"
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| 57 | #include "options.h"
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| 58 | #include "memalloc.h"
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| 59 | #include "error.h"
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| 60 | #include "alias.h"
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| 61 | #include "parser.h"
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| 62 | #include "myhistedit.h"
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| 63 | #include "shinstance.h"
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| 64 |
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| 65 | #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
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| 66 |
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| 67 | //MKINIT
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| 68 | //struct strpush {
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| 69 | // struct strpush *prev; /* preceding string on stack */
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| 70 | // char *prevstring;
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| 71 | // int prevnleft;
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| 72 | // int prevlleft;
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| 73 | // struct alias *ap; /* if push was associated with an alias */
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| 74 | //};
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| 75 | //
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| 76 | ///*
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| 77 | // * The parsefile structure pointed to by the global variable parsefile
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| 78 | // * contains information about the current file being read.
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| 79 | // */
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| 80 | //
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| 81 | //MKINIT
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| 82 | //struct parsefile {
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| 83 | // struct parsefile *prev; /* preceding file on stack */
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| 84 | // int linno; /* current line */
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| 85 | // int fd; /* file descriptor (or -1 if string) */
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| 86 | // int nleft; /* number of chars left in this line */
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| 87 | // int lleft; /* number of chars left in this buffer */
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| 88 | // char *nextc; /* next char in buffer */
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| 89 | // char *buf; /* input buffer */
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| 90 | // struct strpush *strpush; /* for pushing strings at this level */
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| 91 | // struct strpush basestrpush; /* so pushing one is fast */
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| 92 | //};
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| 93 | //
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| 94 | //
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| 95 | //int plinno = 1; /* input line number */
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| 96 | //int parsenleft; /* copy of parsefile->nleft */
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| 97 | //MKINIT int parselleft; /* copy of parsefile->lleft */
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| 98 | //char *parsenextc; /* copy of parsefile->nextc */
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| 99 | //MKINIT struct parsefile basepf; /* top level input file */
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| 100 | //MKINIT char basebuf[BUFSIZ]; /* buffer for top level input file */
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| 101 | //struct parsefile *parsefile = &basepf; /* current input file */
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| 102 | //int init_editline = 0; /* editline library initialized? */
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| 103 | //int whichprompt; /* 1 == PS1, 2 == PS2 */
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| 104 | //
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| 105 | //#ifndef SMALL
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| 106 | //EditLine *el; /* cookie for editline package */
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| 107 | //#endif
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| 108 |
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| 109 | STATIC void pushfile(shinstance *psh);
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| 110 | static int preadfd(shinstance *psh);
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| 111 |
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| 112 | #ifdef mkinit
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| 113 | INCLUDE <stdio.h>
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| 114 | INCLUDE "input.h"
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| 115 | INCLUDE "error.h"
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| 116 |
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| 117 | INIT {
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| 118 | psh->basepf.nextc = psh->basepf.buf = psh->basebuf;
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| 119 | }
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| 120 |
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| 121 | RESET {
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| 122 | if (psh->exception != EXSHELLPROC)
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| 123 | psh->parselleft = psh->parsenleft = 0; /* clear input buffer */
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| 124 | popallfiles(psh);
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| 125 | }
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| 126 |
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| 127 | SHELLPROC {
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| 128 | popallfiles(psh);
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| 129 | }
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| 130 | #endif
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| 131 |
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| 132 |
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| 133 | /*
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| 134 | * Read a line from the script.
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| 135 | */
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| 136 |
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| 137 | char *
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| 138 | pfgets(shinstance *psh, char *line, int len)
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| 139 | {
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| 140 | char *p = line;
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| 141 | int nleft = len;
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| 142 | int c;
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| 143 |
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| 144 | while (--nleft > 0) {
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| 145 | c = pgetc_macro(psh);
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| 146 | if (c == PEOF) {
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| 147 | if (p == line)
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| 148 | return NULL;
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| 149 | break;
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| 150 | }
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| 151 | *p++ = c;
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| 152 | if (c == '\n')
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| 153 | break;
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| 154 | }
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| 155 | *p = '\0';
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| 156 | return line;
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| 157 | }
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| 158 |
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| 159 |
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| 160 |
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| 161 | /*
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| 162 | * Read a character from the script, returning PEOF on end of file.
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| 163 | * Nul characters in the input are silently discarded.
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| 164 | */
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| 165 |
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| 166 | int
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| 167 | pgetc(shinstance *psh)
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| 168 | {
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| 169 | return pgetc_macro(psh);
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| 170 | }
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| 171 |
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| 172 |
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| 173 | static int
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| 174 | preadfd(shinstance *psh)
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| 175 | {
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| 176 | int nr;
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| 177 | char *buf = psh->parsefile->buf;
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| 178 | psh->parsenextc = buf;
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| 179 |
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| 180 | retry:
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| 181 | #ifndef SMALL
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| 182 | if (psh->parsefile->fd == 0 && psh->el) {
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| 183 | static const char *rl_cp;
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| 184 | static int el_len;
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| 185 |
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| 186 | if (rl_cp == NULL)
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| 187 | rl_cp = el_gets(psh->el, &el_len);
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| 188 | if (rl_cp == NULL)
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| 189 | nr = 0;
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| 190 | else {
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| 191 | nr = el_len;
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| 192 | if (nr > BUFSIZ - 8)
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| 193 | nr = BUFSIZ - 8;
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| 194 | memcpy(buf, rl_cp, nr);
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| 195 | if (nr != el_len) {
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| 196 | el_len -= nr;
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| 197 | rl_cp += nr;
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| 198 | } else
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| 199 | rl_cp = 0;
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| 200 | }
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| 201 |
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| 202 | } else
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| 203 | #endif
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| 204 | nr = shfile_read(&psh->fdtab, psh->parsefile->fd, buf, BUFSIZ - 8);
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| 205 |
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| 206 |
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| 207 | if (nr <= 0) {
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| 208 | if (nr < 0) {
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| 209 | if (errno == EINTR)
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| 210 | goto retry;
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| 211 | if (psh->parsefile->fd == 0 && errno == EWOULDBLOCK) {
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| 212 | int flags = shfile_fcntl(&psh->fdtab, 0, F_GETFL, 0);
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| 213 | if (flags >= 0 && flags & O_NONBLOCK) {
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| 214 | flags &=~ O_NONBLOCK;
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| 215 | if (shfile_fcntl(&psh->fdtab, 0, F_SETFL, flags) >= 0) {
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| 216 | out2str(psh, "sh: turning off NDELAY mode\n");
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| 217 | goto retry;
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| 218 | }
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| 219 | }
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| 220 | }
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| 221 | }
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| 222 | nr = -1;
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| 223 | } else {
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| 224 | #ifdef SH_DEAL_WITH_CRLF
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| 225 | char *cr = memchr(buf, '\r', nr);
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| 226 | while (cr) {
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| 227 | size_t left = nr - (cr - buf);
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| 228 | if (left > 1 && cr[1] == '\n') {
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| 229 | left--;
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| 230 | nr--;
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| 231 | memmove(cr, cr + 1, left);
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| 232 | cr = memchr(cr, '\r', left);
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| 233 | } else {
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| 234 | cr = memchr(cr + 1, '\r', left);
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| 235 | }
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| 236 | }
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| 237 | #endif
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| 238 | }
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| 239 | return nr;
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| 240 | }
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| 241 |
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| 242 | /*
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| 243 | * Refill the input buffer and return the next input character:
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| 244 | *
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| 245 | * 1) If a string was pushed back on the input, pop it;
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| 246 | * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
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| 247 | * from a string so we can't refill the buffer, return EOF.
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| 248 | * 3) If the is more stuff in this buffer, use it else call read to fill it.
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| 249 | * 4) Process input up to the next newline, deleting nul characters.
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| 250 | */
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| 251 |
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| 252 | int
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| 253 | preadbuffer(shinstance *psh)
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| 254 | {
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| 255 | char *p, *q;
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| 256 | int more;
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| 257 | int something;
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| 258 | char savec;
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| 259 |
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| 260 | if (psh->parsefile->strpush) {
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| 261 | popstring(psh);
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| 262 | if (--psh->parsenleft >= 0)
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| 263 | return (*psh->parsenextc++);
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| 264 | }
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| 265 | if (psh->parsenleft == EOF_NLEFT || psh->parsefile->buf == NULL)
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| 266 | return PEOF;
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| 267 | flushout(&psh->output);
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| 268 | flushout(&psh->errout);
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| 269 |
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| 270 | again:
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| 271 | if (psh->parselleft <= 0) {
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| 272 | if ((psh->parselleft = preadfd(psh)) == -1) {
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| 273 | psh->parselleft = psh->parsenleft = EOF_NLEFT;
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| 274 | return PEOF;
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| 275 | }
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| 276 | }
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| 277 |
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| 278 | q = p = psh->parsenextc;
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| 279 |
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| 280 | /* delete nul characters */
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| 281 | something = 0;
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| 282 | for (more = 1; more;) {
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| 283 | switch (*p) {
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| 284 | case '\0':
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| 285 | p++; /* Skip nul */
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| 286 | goto check;
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| 287 |
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| 288 | case '\t':
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| 289 | case ' ':
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| 290 | break;
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| 291 |
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| 292 | case '\n':
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| 293 | psh->parsenleft = (int)(q - psh->parsenextc);
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| 294 | more = 0; /* Stop processing here */
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| 295 | break;
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| 296 |
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| 297 | default:
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| 298 | something = 1;
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| 299 | break;
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| 300 | }
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| 301 |
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| 302 | *q++ = *p++;
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| 303 | check:
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| 304 | if (--psh->parselleft <= 0) {
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| 305 | psh->parsenleft = (int)(q - psh->parsenextc - 1);
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| 306 | if (psh->parsenleft < 0)
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| 307 | goto again;
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| 308 | *q = '\0';
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| 309 | more = 0;
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| 310 | }
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| 311 | }
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| 312 |
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| 313 | savec = *q;
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| 314 | *q = '\0';
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| 315 |
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| 316 | #ifndef SMALL
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| 317 | if (psh->parsefile->fd == 0 && hist && something) {
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| 318 | HistEvent he;
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| 319 | INTOFF;
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| 320 | history(hist, &he, psh->whichprompt == 1? H_ENTER : H_APPEND,
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| 321 | psh->parsenextc);
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| 322 | INTON;
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| 323 | }
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| 324 | #endif
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| 325 |
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| 326 | if (vflag(psh)) {
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| 327 | out2str(psh, psh->parsenextc);
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| 328 | flushout(psh->out2);
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| 329 | }
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| 330 |
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| 331 | *q = savec;
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| 332 |
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| 333 | return *psh->parsenextc++;
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| 334 | }
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| 335 |
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| 336 | /*
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| 337 | * Undo the last call to pgetc. Only one character may be pushed back.
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| 338 | * PEOF may be pushed back.
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| 339 | */
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| 340 |
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| 341 | void
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| 342 | pungetc(shinstance *psh)
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| 343 | {
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| 344 | psh->parsenleft++;
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| 345 | psh->parsenextc--;
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| 346 | }
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| 347 |
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| 348 | /*
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| 349 | * Push a string back onto the input at this current parsefile level.
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| 350 | * We handle aliases this way.
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| 351 | */
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| 352 | void
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| 353 | pushstring(shinstance *psh, char *s, size_t len, void *ap)
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| 354 | {
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| 355 | struct strpush *sp;
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| 356 |
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| 357 | INTOFF;
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| 358 | /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
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| 359 | if (psh->parsefile->strpush) {
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| 360 | sp = ckmalloc(psh, sizeof (struct strpush));
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| 361 | sp->prev = psh->parsefile->strpush;
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| 362 | psh->parsefile->strpush = sp;
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| 363 | } else
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| 364 | sp = psh->parsefile->strpush = &(psh->parsefile->basestrpush);
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| 365 | sp->prevstring = psh->parsenextc;
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| 366 | sp->prevnleft = psh->parsenleft;
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| 367 | sp->prevlleft = psh->parselleft;
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| 368 | sp->ap = (struct alias *)ap;
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| 369 | if (ap)
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| 370 | ((struct alias *)ap)->flag |= ALIASINUSE;
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| 371 | psh->parsenextc = s;
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| 372 | psh->parsenleft = (int)len;
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| 373 | INTON;
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| 374 | }
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| 375 |
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| 376 | void
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| 377 | popstring(shinstance *psh)
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| 378 | {
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| 379 | struct strpush *sp = psh->parsefile->strpush;
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| 380 |
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| 381 | INTOFF;
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| 382 | psh->parsenextc = sp->prevstring;
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| 383 | psh->parsenleft = sp->prevnleft;
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| 384 | psh->parselleft = sp->prevlleft;
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| 385 | /*dprintf("*** calling popstring: restoring to '%s'\n", psh->parsenextc);*/
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| 386 | if (sp->ap)
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| 387 | sp->ap->flag &= ~ALIASINUSE;
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| 388 | psh->parsefile->strpush = sp->prev;
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| 389 | if (sp != &(psh->parsefile->basestrpush))
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| 390 | ckfree(psh, sp);
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| 391 | INTON;
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| 392 | }
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| 393 |
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| 394 | /*
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| 395 | * Set the input to take input from a file. If push is set, push the
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| 396 | * old input onto the stack first.
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| 397 | */
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| 398 |
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| 399 | void
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| 400 | setinputfile(shinstance *psh, const char *fname, int push)
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| 401 | {
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| 402 | int fd;
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| 403 | int fd2;
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| 404 |
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| 405 | INTOFF;
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| 406 | /** @todo shfile fixme */
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| 407 | if ((fd = shfile_open(&psh->fdtab, fname, O_RDONLY, 0)) < 0)
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| 408 | error(psh, "Can't open %s", fname);
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| 409 | if (fd < 10) {
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| 410 | fd2 = movefd_above(psh, fd, 10);
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| 411 | if (fd2 < 0)
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| 412 | error(psh, "Out of file descriptors");
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| 413 | fd = fd2;
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| 414 | }
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| 415 | setinputfd(psh, fd, push);
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| 416 | INTON;
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| 417 | }
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| 418 |
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| 419 |
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| 420 | /*
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| 421 | * Like setinputfile, but takes an open file descriptor. Call this with
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| 422 | * interrupts off.
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| 423 | */
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| 424 |
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| 425 | void
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| 426 | setinputfd(shinstance *psh, int fd, int push)
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| 427 | {
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| 428 | (void) shfile_cloexec(&psh->fdtab, fd, 1 /* close it */);
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| 429 | if (push) {
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| 430 | pushfile(psh);
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| 431 | psh->parsefile->buf = ckmalloc(psh, BUFSIZ);
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| 432 | }
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| 433 | if (psh->parsefile->fd > 0)
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| 434 | shfile_close(&psh->fdtab, psh->parsefile->fd);
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| 435 | psh->parsefile->fd = fd;
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| 436 | if (psh->parsefile->buf == NULL)
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| 437 | psh->parsefile->buf = ckmalloc(psh, BUFSIZ);
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| 438 | psh->parselleft = psh->parsenleft = 0;
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| 439 | psh->plinno = 1;
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| 440 | }
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| 441 |
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| 442 |
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| 443 | /*
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| 444 | * Like setinputfile, but takes input from a string.
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| 445 | */
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| 446 |
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| 447 | void
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| 448 | setinputstring(shinstance *psh, char *string, int push)
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| 449 | {
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| 450 | INTOFF;
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| 451 | if (push)
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| 452 | pushfile(psh);
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| 453 | psh->parsenextc = string;
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| 454 | psh->parselleft = psh->parsenleft = (int)strlen(string);
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| 455 | psh->parsefile->buf = NULL;
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| 456 | psh->plinno = 1;
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| 457 | INTON;
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| 458 | }
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| 459 |
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| 460 |
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| 461 |
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| 462 | /*
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| 463 | * To handle the "." command, a stack of input files is used. Pushfile
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| 464 | * adds a new entry to the stack and popfile restores the previous level.
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| 465 | */
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| 466 |
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| 467 | STATIC void
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| 468 | pushfile(shinstance *psh)
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| 469 | {
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| 470 | struct parsefile *pf;
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| 471 |
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| 472 | psh->parsefile->nleft = psh->parsenleft;
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| 473 | psh->parsefile->lleft = psh->parselleft;
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| 474 | psh->parsefile->nextc = psh->parsenextc;
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| 475 | psh->parsefile->linno = psh->plinno;
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| 476 | pf = (struct parsefile *)ckmalloc(psh, sizeof (struct parsefile));
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| 477 | pf->prev = psh->parsefile;
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| 478 | pf->fd = -1;
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| 479 | pf->strpush = NULL;
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| 480 | pf->basestrpush.prev = NULL;
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| 481 | psh->parsefile = pf;
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| 482 | }
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| 483 |
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| 484 |
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| 485 | void
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| 486 | popfile(shinstance *psh)
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| 487 | {
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| 488 | struct parsefile *pf = psh->parsefile;
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| 489 |
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| 490 | INTOFF;
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| 491 | if (pf->fd >= 0)
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| 492 | shfile_close(&psh->fdtab, pf->fd);
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| 493 | if (pf->buf)
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| 494 | ckfree(psh, pf->buf);
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| 495 | while (pf->strpush)
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| 496 | popstring(psh);
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| 497 | psh->parsefile = pf->prev;
|
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| 498 | ckfree(psh, pf);
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| 499 | psh->parsenleft = psh->parsefile->nleft;
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| 500 | psh->parselleft = psh->parsefile->lleft;
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|---|
| 501 | psh->parsenextc = psh->parsefile->nextc;
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| 502 | psh->plinno = psh->parsefile->linno;
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| 503 | INTON;
|
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| 504 | }
|
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| 505 |
|
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| 506 |
|
|---|
| 507 | /*
|
|---|
| 508 | * Return to top level.
|
|---|
| 509 | */
|
|---|
| 510 |
|
|---|
| 511 | void
|
|---|
| 512 | popallfiles(shinstance *psh)
|
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| 513 | {
|
|---|
| 514 | while (psh->parsefile != &psh->basepf)
|
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| 515 | popfile(psh);
|
|---|
| 516 | }
|
|---|
| 517 |
|
|---|
| 518 |
|
|---|
| 519 |
|
|---|
| 520 | /*
|
|---|
| 521 | * Close the file(s) that the shell is reading commands from. Called
|
|---|
| 522 | * after a fork is done.
|
|---|
| 523 | *
|
|---|
| 524 | * Takes one arg, vfork, which tells it to not modify its global vars
|
|---|
| 525 | * as it is still running in the parent.
|
|---|
| 526 | *
|
|---|
| 527 | * This code is (probably) unnecessary as the 'close on exec' flag is
|
|---|
| 528 | * set and should be enough. In the vfork case it is definitely wrong
|
|---|
| 529 | * to close the fds as another fork() may be done later to feed data
|
|---|
| 530 | * from a 'here' document into a pipe and we don't want to close the
|
|---|
| 531 | * pipe!
|
|---|
| 532 | */
|
|---|
| 533 |
|
|---|
| 534 | void
|
|---|
| 535 | closescript(shinstance *psh, int vforked)
|
|---|
| 536 | {
|
|---|
| 537 | if (vforked)
|
|---|
| 538 | return;
|
|---|
| 539 | popallfiles(psh);
|
|---|
| 540 | if (psh->parsefile->fd > 0) {
|
|---|
| 541 | shfile_close(&psh->fdtab, psh->parsefile->fd);
|
|---|
| 542 | psh->parsefile->fd = 0;
|
|---|
| 543 | }
|
|---|
| 544 | }
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