| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)output.c 5.1 (Berkeley) 3/7/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | /*
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| 42 | * Shell output routines. We use our own output routines because:
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| 43 | * When a builtin command is interrupted we have to discard
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| 44 | * any pending output.
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| 45 | * When a builtin command appears in back quotes, we want to
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| 46 | * save the output of the command in a region obtained
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| 47 | * via malloc, rather than doing a fork and reading the
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| 48 | * output of the command via a pipe.
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| 49 | * Our output routines may be smaller than the stdio routines.
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| 50 | */
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| 51 |
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| 52 | #include <stdio.h> /* defines BUFSIZ */
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| 53 | #include "shell.h"
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| 54 | #include "syntax.h"
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| 55 | #include "output.h"
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| 56 | #include "memalloc.h"
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| 57 | #include "error.h"
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| 58 | #ifdef __STDC__
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| 59 | #include "stdarg.h"
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| 60 | #else
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| 61 | #include <varargs.h>
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| 62 | #endif
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| 63 | #include <errno.h>
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| 64 |
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| 65 |
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| 66 | #define OUTBUFSIZ BUFSIZ
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| 67 | #define BLOCK_OUT -2 /* output to a fixed block of memory */
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| 68 | #define MEM_OUT -3 /* output to dynamically allocated memory */
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| 69 | #define OUTPUT_ERR 01 /* error occurred on output */
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| 70 |
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| 71 |
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| 72 | struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
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| 73 | struct output errout = {NULL, 0, NULL, 100, 2, 0};
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| 74 | struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
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| 75 | struct output *out1 = &output;
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| 76 | struct output *out2 = &errout;
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| 77 |
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| 78 |
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| 79 |
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| 80 | #ifdef mkinit
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| 81 |
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| 82 | INCLUDE "output.h"
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| 83 | INCLUDE "memalloc.h"
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| 84 |
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| 85 | RESET {
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| 86 | out1 = &output;
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| 87 | out2 = &errout;
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| 88 | if (memout.buf != NULL) {
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| 89 | ckfree(memout.buf);
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| 90 | memout.buf = NULL;
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | #endif
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| 95 |
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| 96 |
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| 97 | #ifdef notdef /* no longer used */
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| 98 | /*
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| 99 | * Set up an output file to write to memory rather than a file.
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| 100 | */
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| 101 |
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| 102 | void
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| 103 | open_mem(block, length, file)
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| 104 | char *block;
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| 105 | int length;
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| 106 | struct output *file;
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| 107 | {
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| 108 | file->nextc = block;
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| 109 | file->nleft = --length;
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| 110 | file->fd = BLOCK_OUT;
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| 111 | file->flags = 0;
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| 112 | }
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| 113 | #endif
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| 114 |
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| 115 |
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| 116 | void
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| 117 | out1str(p)
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| 118 | char *p;
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| 119 | {
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| 120 | outstr(p, out1);
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| 121 | }
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| 122 |
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| 123 |
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| 124 | void
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| 125 | out2str(p)
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| 126 | char *p;
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| 127 | {
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| 128 | outstr(p, out2);
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| 129 | }
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| 130 |
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| 131 |
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| 132 | void
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| 133 | outstr(p, file)
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| 134 | register char *p;
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| 135 | register struct output *file;
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| 136 | {
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| 137 | while (*p)
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| 138 | outc(*p++, file);
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| 139 | }
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| 140 |
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| 141 |
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| 142 | char out_junk[16];
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| 143 |
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| 144 |
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| 145 | void
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| 146 | emptyoutbuf(dest)
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| 147 | struct output *dest;
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| 148 | {
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| 149 | int offset;
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| 150 |
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| 151 | if (dest->fd == BLOCK_OUT) {
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| 152 | dest->nextc = out_junk;
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| 153 | dest->nleft = sizeof out_junk;
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| 154 | dest->flags |= OUTPUT_ERR;
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| 155 | } else if (dest->buf == NULL) {
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| 156 | INTOFF;
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| 157 | dest->buf = ckmalloc(dest->bufsize);
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| 158 | dest->nextc = dest->buf;
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| 159 | dest->nleft = dest->bufsize;
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| 160 | INTON;
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| 161 | } else if (dest->fd == MEM_OUT) {
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| 162 | offset = dest->bufsize;
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| 163 | INTOFF;
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| 164 | dest->bufsize <<= 1;
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| 165 | dest->buf = ckrealloc(dest->buf, dest->bufsize);
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| 166 | dest->nleft = dest->bufsize - offset;
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| 167 | dest->nextc = dest->buf + offset;
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| 168 | INTON;
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| 169 | } else {
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| 170 | flushout(dest);
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| 171 | }
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| 172 | dest->nleft--;
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| 173 | }
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| 174 |
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| 175 |
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| 176 | void
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| 177 | flushall() {
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| 178 | flushout(&output);
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| 179 | flushout(&errout);
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| 180 | }
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| 181 |
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| 182 |
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| 183 | void
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| 184 | flushout(dest)
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| 185 | struct output *dest;
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| 186 | {
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| 187 |
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| 188 | if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
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| 189 | return;
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| 190 | if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
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| 191 | dest->flags |= OUTPUT_ERR;
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| 192 | dest->nextc = dest->buf;
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| 193 | dest->nleft = dest->bufsize;
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| 194 | }
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| 195 |
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| 196 |
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| 197 | void
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| 198 | freestdout() {
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| 199 | INTOFF;
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| 200 | if (output.buf) {
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| 201 | ckfree(output.buf);
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| 202 | output.buf = NULL;
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| 203 | output.nleft = 0;
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| 204 | }
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| 205 | INTON;
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| 206 | }
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| 207 |
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| 208 |
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| 209 | #ifdef __STDC__
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| 210 | void
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| 211 | outfmt(struct output *file, char *fmt, ...) {
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| 212 | va_list ap;
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| 213 |
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| 214 | va_start(ap, fmt);
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| 215 | doformat(file, fmt, ap);
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| 216 | va_end(ap);
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| 217 | }
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| 218 |
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| 219 |
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| 220 | void
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| 221 | out1fmt(char *fmt, ...) {
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| 222 | va_list ap;
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| 223 |
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| 224 | va_start(ap, fmt);
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| 225 | doformat(out1, fmt, ap);
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| 226 | va_end(ap);
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| 227 | }
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| 228 |
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| 229 |
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| 230 | void
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| 231 | fmtstr(char *outbuf, int length, char *fmt, ...) {
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| 232 | va_list ap;
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| 233 | struct output strout;
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| 234 |
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| 235 | va_start(ap, fmt);
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| 236 | strout.nextc = outbuf;
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| 237 | strout.nleft = length;
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| 238 | strout.fd = BLOCK_OUT;
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| 239 | strout.flags = 0;
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| 240 | doformat(&strout, fmt, ap);
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| 241 | outc('\0', &strout);
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| 242 | if (strout.flags & OUTPUT_ERR)
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| 243 | outbuf[length - 1] = '\0';
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| 244 | va_end(ap);
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| 245 | }
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| 246 |
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| 247 | #else /* not __STDC__ */
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| 248 |
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| 249 | void
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| 250 | outfmt(va_alist)
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| 251 | va_dcl
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| 252 | {
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| 253 | va_list ap;
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| 254 | struct output *file;
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| 255 | char *fmt;
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| 256 |
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| 257 | va_start(ap);
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| 258 | file = va_arg(ap, struct output *);
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| 259 | fmt = va_arg(ap, char *);
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| 260 | doformat(file, fmt, ap);
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| 261 | va_end(ap);
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| 262 | }
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| 263 |
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| 264 |
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| 265 | void
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| 266 | out1fmt(va_alist)
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| 267 | va_dcl
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| 268 | {
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| 269 | va_list ap;
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| 270 | char *fmt;
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| 271 |
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| 272 | va_start(ap);
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| 273 | fmt = va_arg(ap, char *);
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| 274 | doformat(out1, fmt, ap);
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| 275 | va_end(ap);
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| 276 | }
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| 277 |
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| 278 |
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| 279 | void
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| 280 | fmtstr(va_alist)
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| 281 | va_dcl
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| 282 | {
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| 283 | va_list ap;
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| 284 | struct output strout;
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| 285 | char *outbuf;
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| 286 | int length;
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| 287 | char *fmt;
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| 288 |
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| 289 | va_start(ap);
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| 290 | outbuf = va_arg(ap, char *);
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| 291 | length = va_arg(ap, int);
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| 292 | fmt = va_arg(ap, char *);
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| 293 | strout.nextc = outbuf;
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| 294 | strout.nleft = length;
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| 295 | strout.fd = BLOCK_OUT;
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| 296 | strout.flags = 0;
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| 297 | doformat(&strout, fmt, ap);
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| 298 | outc('\0', &strout);
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| 299 | if (strout.flags & OUTPUT_ERR)
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| 300 | outbuf[length - 1] = '\0';
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| 301 | }
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| 302 | #endif /* __STDC__ */
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| 303 |
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| 304 |
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| 305 | /*
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| 306 | * Formatted output. This routine handles a subset of the printf formats:
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| 307 | * - Formats supported: d, u, o, X, s, and c.
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| 308 | * - The x format is also accepted but is treated like X.
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| 309 | * - The l modifier is accepted.
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| 310 | * - The - and # flags are accepted; # only works with the o format.
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| 311 | * - Width and precision may be specified with any format except c.
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| 312 | * - An * may be given for the width or precision.
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| 313 | * - The obsolete practice of preceding the width with a zero to get
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| 314 | * zero padding is not supported; use the precision field.
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| 315 | * - A % may be printed by writing %% in the format string.
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| 316 | */
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| 317 |
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| 318 | #define TEMPSIZE 24
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| 319 |
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| 320 | #ifdef __STDC__
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| 321 | static const char digit[16] = "0123456789ABCDEF";
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| 322 | #else
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| 323 | static const char digit[17] = "0123456789ABCDEF";
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| 324 | #endif
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| 325 |
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| 326 |
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| 327 | void
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| 328 | doformat(dest, f, ap)
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| 329 | register struct output *dest;
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| 330 | register char *f; /* format string */
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| 331 | va_list ap;
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| 332 | {
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| 333 | register char c;
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| 334 | char temp[TEMPSIZE];
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| 335 | int flushleft;
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| 336 | int sharp;
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| 337 | int width;
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| 338 | int prec;
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| 339 | int islong;
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| 340 | char *p;
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| 341 | int sign;
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| 342 | long l;
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| 343 | unsigned long num;
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| 344 | unsigned base;
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| 345 | int len;
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| 346 | int size;
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| 347 | int pad;
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| 348 |
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| 349 | while ((c = *f++) != '\0') {
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| 350 | if (c != '%') {
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| 351 | outc(c, dest);
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| 352 | continue;
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| 353 | }
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| 354 | flushleft = 0;
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| 355 | sharp = 0;
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| 356 | width = 0;
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| 357 | prec = -1;
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| 358 | islong = 0;
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| 359 | for (;;) {
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| 360 | if (*f == '-')
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| 361 | flushleft++;
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| 362 | else if (*f == '#')
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| 363 | sharp++;
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| 364 | else
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| 365 | break;
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| 366 | f++;
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| 367 | }
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| 368 | if (*f == '*') {
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| 369 | width = va_arg(ap, int);
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| 370 | f++;
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| 371 | } else {
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| 372 | while (is_digit(*f)) {
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| 373 | width = 10 * width + digit_val(*f++);
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| 374 | }
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| 375 | }
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| 376 | if (*f == '.') {
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| 377 | if (*++f == '*') {
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| 378 | prec = va_arg(ap, int);
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| 379 | f++;
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| 380 | } else {
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| 381 | prec = 0;
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| 382 | while (is_digit(*f)) {
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| 383 | prec = 10 * prec + digit_val(*f++);
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| 384 | }
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| 385 | }
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| 386 | }
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| 387 | if (*f == 'l') {
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| 388 | islong++;
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| 389 | f++;
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| 390 | }
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| 391 | switch (*f) {
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| 392 | case 'd':
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| 393 | if (islong)
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| 394 | l = va_arg(ap, long);
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| 395 | else
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| 396 | l = va_arg(ap, int);
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| 397 | sign = 0;
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| 398 | num = l;
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| 399 | if (l < 0) {
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| 400 | num = -l;
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| 401 | sign = 1;
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| 402 | }
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| 403 | base = 10;
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| 404 | goto number;
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| 405 | case 'u':
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| 406 | base = 10;
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| 407 | goto uns_number;
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| 408 | case 'o':
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| 409 | base = 8;
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| 410 | goto uns_number;
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| 411 | case 'x':
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| 412 | /* we don't implement 'x'; treat like 'X' */
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| 413 | case 'X':
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| 414 | base = 16;
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| 415 | uns_number: /* an unsigned number */
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| 416 | sign = 0;
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| 417 | if (islong)
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| 418 | num = va_arg(ap, unsigned long);
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| 419 | else
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| 420 | num = va_arg(ap, unsigned int);
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| 421 | number: /* process a number */
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| 422 | p = temp + TEMPSIZE - 1;
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| 423 | *p = '\0';
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| 424 | while (num) {
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| 425 | *--p = digit[num % base];
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| 426 | num /= base;
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| 427 | }
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| 428 | len = (temp + TEMPSIZE - 1) - p;
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| 429 | if (prec < 0)
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| 430 | prec = 1;
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| 431 | if (sharp && *f == 'o' && prec <= len)
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| 432 | prec = len + 1;
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| 433 | pad = 0;
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| 434 | if (width) {
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| 435 | size = len;
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| 436 | if (size < prec)
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| 437 | size = prec;
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| 438 | size += sign;
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| 439 | pad = width - size;
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| 440 | if (flushleft == 0) {
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| 441 | while (--pad >= 0)
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| 442 | outc(' ', dest);
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| 443 | }
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| 444 | }
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| 445 | if (sign)
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| 446 | outc('-', dest);
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| 447 | prec -= len;
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| 448 | while (--prec >= 0)
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| 449 | outc('0', dest);
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| 450 | while (*p)
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| 451 | outc(*p++, dest);
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| 452 | while (--pad >= 0)
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| 453 | outc(' ', dest);
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| 454 | break;
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| 455 | case 's':
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| 456 | p = va_arg(ap, char *);
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| 457 | pad = 0;
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| 458 | if (width) {
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| 459 | len = strlen(p);
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| 460 | if (prec >= 0 && len > prec)
|
|---|
| 461 | len = prec;
|
|---|
| 462 | pad = width - len;
|
|---|
| 463 | if (flushleft == 0) {
|
|---|
| 464 | while (--pad >= 0)
|
|---|
| 465 | outc(' ', dest);
|
|---|
| 466 | }
|
|---|
| 467 | }
|
|---|
| 468 | prec++;
|
|---|
| 469 | while (--prec != 0 && *p)
|
|---|
| 470 | outc(*p++, dest);
|
|---|
| 471 | while (--pad >= 0)
|
|---|
| 472 | outc(' ', dest);
|
|---|
| 473 | break;
|
|---|
| 474 | case 'c':
|
|---|
| 475 | c = va_arg(ap, int);
|
|---|
| 476 | outc(c, dest);
|
|---|
| 477 | break;
|
|---|
| 478 | default:
|
|---|
| 479 | outc(*f, dest);
|
|---|
| 480 | break;
|
|---|
| 481 | }
|
|---|
| 482 | f++;
|
|---|
| 483 | }
|
|---|
| 484 | }
|
|---|
| 485 |
|
|---|
| 486 |
|
|---|
| 487 |
|
|---|
| 488 | /*
|
|---|
| 489 | * Version of write which resumes after a signal is caught.
|
|---|
| 490 | */
|
|---|
| 491 |
|
|---|
| 492 | int
|
|---|
| 493 | xwrite(fd, buf, nbytes)
|
|---|
| 494 | int fd;
|
|---|
| 495 | char *buf;
|
|---|
| 496 | int nbytes;
|
|---|
| 497 | {
|
|---|
| 498 | int ntry;
|
|---|
| 499 | int i;
|
|---|
| 500 | int n;
|
|---|
| 501 |
|
|---|
| 502 | n = nbytes;
|
|---|
| 503 | ntry = 0;
|
|---|
| 504 | for (;;) {
|
|---|
| 505 | i = write(fd, buf, n);
|
|---|
| 506 | if (i > 0) {
|
|---|
| 507 | if ((n -= i) <= 0)
|
|---|
| 508 | return nbytes;
|
|---|
| 509 | buf += i;
|
|---|
| 510 | ntry = 0;
|
|---|
| 511 | } else if (i == 0) {
|
|---|
| 512 | if (++ntry > 10)
|
|---|
| 513 | return nbytes - n;
|
|---|
| 514 | } else if (errno != EINTR) {
|
|---|
| 515 | return -1;
|
|---|
| 516 | }
|
|---|
| 517 | }
|
|---|
| 518 | }
|
|---|
| 519 |
|
|---|
| 520 |
|
|---|
| 521 | /*
|
|---|
| 522 | * Version of ioctl that retries after a signal is caught.
|
|---|
| 523 | */
|
|---|
| 524 |
|
|---|
| 525 | int
|
|---|
| 526 | xioctl(fd, request, arg) {
|
|---|
| 527 | int i;
|
|---|
| 528 |
|
|---|
| 529 | while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
|
|---|
| 530 | return i;
|
|---|
| 531 | }
|
|---|
