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3f0131f65b
This makes a difference for the trap builtin, where after "trap '' 0" we printed "trap -- quit". This is wrong, because an empty action means to reset the action to the default. A side effect of this commit is that empty variables are now printed as "variable=''" instead of just "variable=".
336 lines
6.5 KiB
C
336 lines
6.5 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Shell output routines. We use our own output routines because:
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* When a builtin command is interrupted we have to discard
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* any pending output.
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* When a builtin command appears in back quotes, we want to
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* save the output of the command in a region obtained
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* via malloc, rather than doing a fork and reading the
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* output of the command via a pipe.
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*/
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#include <stdio.h> /* defines BUFSIZ */
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "shell.h"
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#include "syntax.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "var.h"
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#define OUTBUFSIZ BUFSIZ
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#define BLOCK_OUT -2 /* output to a fixed block of memory */
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#define MEM_OUT -3 /* output to dynamically allocated memory */
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#define OUTPUT_ERR 01 /* error occurred on output */
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static int doformat_wr(void *, const char *, int);
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struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
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struct output errout = {NULL, 0, NULL, 100, 2, 0};
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struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
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struct output *out1 = &output;
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struct output *out2 = &errout;
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#ifdef mkinit
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INCLUDE "output.h"
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INCLUDE "memalloc.h"
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RESET {
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out1 = &output;
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out2 = &errout;
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if (memout.buf != NULL) {
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ckfree(memout.buf);
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memout.buf = NULL;
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}
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}
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#endif
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void
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out1str(const char *p)
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{
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outstr(p, out1);
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}
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void
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out1qstr(const char *p)
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{
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outqstr(p, out1);
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}
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void
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out2str(const char *p)
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{
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outstr(p, out2);
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}
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void
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out2qstr(const char *p)
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{
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outqstr(p, out2);
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}
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void
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outstr(const char *p, struct output *file)
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{
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while (*p)
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outc(*p++, file);
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if (file == out2)
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flushout(file);
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}
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/* Like outstr(), but quote for re-input into the shell. */
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void
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outqstr(const char *p, struct output *file)
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{
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char ch;
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if (p[0] == '\0') {
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outstr("''", file);
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return;
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}
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if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() ||
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p[strcspn(p, ifsval())] == '\0')) {
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outstr(p, file);
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return;
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}
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out1c('\'');
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while ((ch = *p++) != '\0') {
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switch (ch) {
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case '\'':
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/*
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* Can't quote single quotes inside single quotes;
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* close them, write escaped single quote, open again.
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*/
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outstr("'\\''", file);
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break;
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default:
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outc(ch, file);
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}
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}
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out1c('\'');
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}
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STATIC char out_junk[16];
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void
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emptyoutbuf(struct output *dest)
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{
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int offset;
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if (dest->fd == BLOCK_OUT) {
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dest->nextc = out_junk;
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dest->nleft = sizeof out_junk;
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dest->flags |= OUTPUT_ERR;
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} else if (dest->buf == NULL) {
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INTOFF;
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dest->buf = ckmalloc(dest->bufsize);
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dest->nextc = dest->buf;
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dest->nleft = dest->bufsize;
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INTON;
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} else if (dest->fd == MEM_OUT) {
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offset = dest->bufsize;
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INTOFF;
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dest->bufsize <<= 1;
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dest->buf = ckrealloc(dest->buf, dest->bufsize);
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dest->nleft = dest->bufsize - offset;
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dest->nextc = dest->buf + offset;
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INTON;
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} else {
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flushout(dest);
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}
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dest->nleft--;
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}
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void
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flushall(void)
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{
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flushout(&output);
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flushout(&errout);
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}
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void
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flushout(struct output *dest)
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{
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if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
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return;
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if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
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dest->flags |= OUTPUT_ERR;
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dest->nextc = dest->buf;
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dest->nleft = dest->bufsize;
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}
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void
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freestdout(void)
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{
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INTOFF;
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if (output.buf) {
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ckfree(output.buf);
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output.buf = NULL;
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output.nleft = 0;
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}
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INTON;
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}
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void
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outfmt(struct output *file, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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doformat(file, fmt, ap);
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va_end(ap);
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}
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void
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out1fmt(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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doformat(out1, fmt, ap);
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va_end(ap);
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}
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void
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dprintf(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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doformat(out2, fmt, ap);
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va_end(ap);
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flushout(out2);
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}
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void
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fmtstr(char *outbuf, int length, const char *fmt, ...)
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{
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va_list ap;
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struct output strout;
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strout.nextc = outbuf;
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strout.nleft = length;
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strout.fd = BLOCK_OUT;
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strout.flags = 0;
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va_start(ap, fmt);
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doformat(&strout, fmt, ap);
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va_end(ap);
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outc('\0', &strout);
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if (strout.flags & OUTPUT_ERR)
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outbuf[length - 1] = '\0';
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}
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static int
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doformat_wr(void *cookie, const char *buf, int len)
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{
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struct output *o;
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int origlen;
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unsigned char c;
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o = (struct output *)cookie;
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origlen = len;
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while (len-- != 0) {
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c = (unsigned char)*buf++;
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outc(c, o);
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}
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return (origlen);
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}
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void
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doformat(struct output *dest, const char *f, va_list ap)
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{
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FILE *fp;
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if ((fp = fwopen(dest, doformat_wr)) != NULL) {
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vfprintf(fp, f, ap);
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fclose(fp);
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}
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}
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/*
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* Version of write which resumes after a signal is caught.
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*/
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int
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xwrite(int fd, char *buf, int nbytes)
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{
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int ntry;
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int i;
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int n;
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n = nbytes;
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ntry = 0;
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for (;;) {
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i = write(fd, buf, n);
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if (i > 0) {
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if ((n -= i) <= 0)
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return nbytes;
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buf += i;
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ntry = 0;
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} else if (i == 0) {
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if (++ntry > 10)
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return nbytes - n;
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} else if (errno != EINTR) {
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return -1;
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}
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}
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}
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