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