ae40879b6d
some other install media, mini-roots, etc.) It is unlikely that such a shell will be used for much script debugging (and the old -x still exists of course) and it adds a little bloat, so, zap... The ancient unused (unrelated) xioctl() function is gone as well (from all shells).
756 lines
14 KiB
C
756 lines
14 KiB
C
/* $NetBSD: output.c,v 1.40 2017/11/21 03:42:39 kre Exp $ */
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/*-
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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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* 3. 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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#include <sys/cdefs.h>
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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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#else
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__RCSID("$NetBSD: output.c,v 1.40 2017/11/21 03:42:39 kre Exp $");
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#endif
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#endif /* not lint */
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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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* Our output routines may be smaller than the stdio routines.
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*/
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#include <sys/types.h> /* quad_t */
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#include <sys/param.h> /* BSD4_4 */
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#include <sys/ioctl.h>
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#include <stdio.h> /* defines BUFSIZ */
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#include <string.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 "redir.h"
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#include "options.h"
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#include "show.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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#ifdef SMALL
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#define CHAIN
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#else
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#define CHAIN ,NULL
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#endif
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/* nextc nleft bufsize buf fd flags chain */
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struct output output = {NULL, 0, OUTBUFSIZ, NULL, 1, 0 CHAIN };
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struct output errout = {NULL, 0, 100, NULL, 2, 0 CHAIN };
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struct output memout = {NULL, 0, 0, NULL, MEM_OUT, 0 CHAIN };
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struct output *out1 = &output;
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struct output *out2 = &errout;
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#ifndef SMALL
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struct output *outx = &errout;
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struct output *outxtop = NULL;
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#endif
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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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#ifdef notdef /* no longer used */
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/*
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* Set up an output file to write to memory rather than a file.
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*/
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void
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open_mem(char *block, int length, struct output *file)
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{
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file->nextc = block;
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file->nleft = --length;
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file->fd = BLOCK_OUT;
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file->flags = 0;
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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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out2str(const char *p)
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{
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outstr(p, out2);
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}
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#ifndef SMALL
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void
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outxstr(const char *p)
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{
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outstr(p, outx);
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}
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#endif
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void
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outstr(const char *p, struct output *file)
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{
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char c = 0;
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while (*p)
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outc((c = *p++), file);
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if (file == out2 || (file == outx && c == '\n'))
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flushout(file);
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}
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void
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out2shstr(const char *p)
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{
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outshstr(p, out2);
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}
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#ifndef SMALL
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void
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outxshstr(const char *p)
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{
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outshstr(p, outx);
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}
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#endif
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/*
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* ' is in this list, not because it does not require quoting
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* (which applies to all the others) but because '' quoting cannot
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* be used to quote it.
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*/
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static const char norm_chars [] = \
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/+-=_,.'";
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static int
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inquote(const char *p)
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{
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size_t l = strspn(p, norm_chars);
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char *s = strchr(p, '\'');
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return s == NULL ? p[l] != '\0' : s - p > (off_t)l;
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}
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void
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outshstr(const char *p, struct output *file)
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{
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int need_q;
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int inq;
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char c;
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if (strchr(p, '\'') != NULL && p[1] != '\0') {
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/*
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* string contains ' in it, and is not only the '
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* see if " quoting will work
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*/
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size_t i = strcspn(p, "\\\"$`");
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if (p[i] == '\0') {
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/*
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* string contains no $ ` \ or " chars, perfect...
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*
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* We know it contains ' so needs quoting, so
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* this is easy...
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*/
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outc('"', file);
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outstr(p, file);
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outc('"', file);
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return;
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}
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}
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need_q = p[0] == 0 || p[strspn(p, norm_chars)] != 0;
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/*
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* Don't emit ' unless something needs quoting before closing '
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*/
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if (need_q && (p[0] == 0 || inquote(p) != 0)) {
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outc('\'', file);
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inq = 1;
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} else
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inq = 0;
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while ((c = *p++) != '\0') {
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if (c != '\'') {
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outc(c, file);
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continue;
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}
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if (inq)
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outc('\'', file); /* inq = 0, implicit */
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outc('\\', file);
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outc(c, file);
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if (need_q && *p != '\0') {
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if ((inq = inquote(p)) != 0)
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outc('\'', file);
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} else
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inq = 0;
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}
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if (inq)
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outc('\'', file);
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if (file == out2)
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flushout(file);
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}
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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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VTRACE(DBG_OUTPUT, ("emptyoutbuf now %d @%p for fd %d\n",
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dest->nleft, dest->buf, dest->fd));
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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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VTRACE(DBG_OUTPUT, ("flushout fd=%d %zd to write\n", dest->fd,
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(size_t)(dest->nextc - dest->buf)));
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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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#ifdef DEBUG
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void
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debugprintf(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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#endif
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void
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fmtstr(char *outbuf, size_t 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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va_start(ap, fmt);
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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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doformat(&strout, fmt, 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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va_end(ap);
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}
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/*
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* Formatted output. This routine handles a subset of the printf formats:
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* - Formats supported: d, u, o, p, X, s, and c.
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* - The x format is also accepted but is treated like X.
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* - The l, ll and q modifiers are accepted.
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* - The - and # flags are accepted; # only works with the o format.
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* - Width and precision may be specified with any format except c.
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* - An * may be given for the width or precision.
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* - The obsolete practice of preceding the width with a zero to get
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* zero padding is not supported; use the precision field.
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* - A % may be printed by writing %% in the format string.
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*/
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#define TEMPSIZE 24
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#ifdef BSD4_4
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#define HAVE_VASPRINTF 1
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#endif
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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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#if HAVE_VASPRINTF
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char *s;
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vasprintf(&s, f, ap);
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if (s == NULL)
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error("Could not allocate formatted output buffer");
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outstr(s, dest);
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free(s);
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#else /* !HAVE_VASPRINTF */
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static const char digit[] = "0123456789ABCDEF";
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char c;
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char temp[TEMPSIZE];
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int flushleft;
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int sharp;
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int width;
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int prec;
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int islong;
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int isquad;
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char *p;
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int sign;
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#ifdef BSD4_4
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quad_t l;
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u_quad_t num;
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#else
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long l;
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u_long num;
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#endif
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unsigned base;
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int len;
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int size;
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int pad;
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while ((c = *f++) != '\0') {
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if (c != '%') {
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outc(c, dest);
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continue;
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}
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flushleft = 0;
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sharp = 0;
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width = 0;
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prec = -1;
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islong = 0;
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isquad = 0;
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for (;;) {
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if (*f == '-')
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flushleft++;
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else if (*f == '#')
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sharp++;
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else
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break;
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f++;
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}
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if (*f == '*') {
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width = va_arg(ap, int);
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f++;
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} else {
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while (is_digit(*f)) {
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width = 10 * width + digit_val(*f++);
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}
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}
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if (*f == '.') {
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if (*++f == '*') {
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prec = va_arg(ap, int);
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f++;
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} else {
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prec = 0;
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while (is_digit(*f)) {
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prec = 10 * prec + digit_val(*f++);
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}
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}
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}
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if (*f == 'l') {
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f++;
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if (*f == 'l') {
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isquad++;
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f++;
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} else
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islong++;
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} else if (*f == 'q') {
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isquad++;
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f++;
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}
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switch (*f) {
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case 'd':
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#ifdef BSD4_4
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if (isquad)
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l = va_arg(ap, quad_t);
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else
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#endif
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if (islong)
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l = va_arg(ap, long);
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else
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l = va_arg(ap, int);
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sign = 0;
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num = l;
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if (l < 0) {
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num = -l;
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sign = 1;
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}
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base = 10;
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goto number;
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case 'u':
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base = 10;
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goto uns_number;
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|
case 'o':
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base = 8;
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goto uns_number;
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case 'p':
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outc('0', dest);
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|
outc('x', dest);
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/*FALLTHROUGH*/
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case 'x':
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/* we don't implement 'x'; treat like 'X' */
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case 'X':
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base = 16;
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uns_number: /* an unsigned number */
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sign = 0;
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#ifdef BSD4_4
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if (isquad)
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num = va_arg(ap, u_quad_t);
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else
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|
#endif
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if (islong)
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num = va_arg(ap, unsigned long);
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else
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num = va_arg(ap, unsigned int);
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number: /* process a number */
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p = temp + TEMPSIZE - 1;
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*p = '\0';
|
|
while (num) {
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*--p = digit[num % base];
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num /= base;
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}
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len = (temp + TEMPSIZE - 1) - p;
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if (prec < 0)
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prec = 1;
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if (sharp && *f == 'o' && prec <= len)
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prec = len + 1;
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pad = 0;
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if (width) {
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size = len;
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|
if (size < prec)
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size = prec;
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size += sign;
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pad = width - size;
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if (flushleft == 0) {
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while (--pad >= 0)
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outc(' ', dest);
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}
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}
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if (sign)
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outc('-', dest);
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prec -= len;
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while (--prec >= 0)
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outc('0', dest);
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while (*p)
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outc(*p++, dest);
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while (--pad >= 0)
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outc(' ', dest);
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break;
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case 's':
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p = va_arg(ap, char *);
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pad = 0;
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if (width) {
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len = strlen(p);
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if (prec >= 0 && len > prec)
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len = prec;
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pad = width - len;
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if (flushleft == 0) {
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while (--pad >= 0)
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outc(' ', dest);
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}
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}
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prec++;
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while (--prec != 0 && *p)
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outc(*p++, dest);
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while (--pad >= 0)
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outc(' ', dest);
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break;
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case 'c':
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c = va_arg(ap, int);
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outc(c, dest);
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break;
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|
default:
|
|
outc(*f, dest);
|
|
break;
|
|
}
|
|
f++;
|
|
}
|
|
#endif /* !HAVE_VASPRINTF */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Version of write which resumes after a signal is caught.
|
|
*/
|
|
|
|
int
|
|
xwrite(int fd, char *buf, int nbytes)
|
|
{
|
|
int ntry;
|
|
int i;
|
|
int n;
|
|
|
|
n = nbytes;
|
|
ntry = 0;
|
|
while (n > 0) {
|
|
i = write(fd, buf, n);
|
|
if (i > 0) {
|
|
if ((n -= i) <= 0)
|
|
return nbytes;
|
|
buf += i;
|
|
ntry = 0;
|
|
} else if (i == 0) {
|
|
if (++ntry > 10)
|
|
return nbytes - n;
|
|
} else if (errno != EINTR) {
|
|
return -1;
|
|
}
|
|
}
|
|
return nbytes;
|
|
}
|
|
|
|
#ifndef SMALL
|
|
static void
|
|
xtrace_fd_swap(int from, int to)
|
|
{
|
|
struct output *o = outxtop;
|
|
|
|
while (o != NULL) {
|
|
if (o->fd == from)
|
|
o->fd = to;
|
|
o = o->chain;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* the -X flag is to be set or reset (not necessarily changed)
|
|
* Do what is needed to make tracing go to where it should
|
|
*
|
|
* Note: Xflag has not yet been altered, "on" indicates what it will become
|
|
*/
|
|
|
|
void
|
|
xtracefdsetup(int on)
|
|
{
|
|
if (!on) {
|
|
flushout(outx);
|
|
|
|
if (Xflag != 1) /* Was already +X */
|
|
return; /* so nothing to do */
|
|
|
|
outx = out2;
|
|
CTRACE(DBG_OUTPUT, ("Tracing to stderr\n"));
|
|
return;
|
|
}
|
|
|
|
if (Xflag == 1) { /* was already set */
|
|
/*
|
|
* This is a change of output file only
|
|
* Just close the current one, and reuse the struct output
|
|
*/
|
|
if (!(outx->flags & OUTPUT_CLONE))
|
|
sh_close(outx->fd);
|
|
} else if (outxtop == NULL) {
|
|
/*
|
|
* -X is just turning on, for the forst time,
|
|
* need a new output struct to become outx
|
|
*/
|
|
xtrace_clone(1);
|
|
} else
|
|
outx = outxtop;
|
|
|
|
if (outx != out2) {
|
|
outx->flags &= ~OUTPUT_CLONE;
|
|
outx->fd = to_upper_fd(dup(out2->fd));
|
|
register_sh_fd(outx->fd, xtrace_fd_swap);
|
|
}
|
|
|
|
CTRACE(DBG_OUTPUT, ("Tracing now to fd %d (from %d)\n",
|
|
outx->fd, out2->fd));
|
|
}
|
|
|
|
void
|
|
xtrace_clone(int new)
|
|
{
|
|
struct output *o;
|
|
|
|
CTRACE(DBG_OUTPUT,
|
|
("xtrace_clone(%d): %sfd=%d buf=%p nleft=%d flags=%x ",
|
|
new, (outx == out2 ? "out2: " : ""),
|
|
outx->fd, outx->buf, outx->nleft, outx->flags));
|
|
|
|
flushout(outx);
|
|
|
|
if (!new && outxtop == NULL && Xflag == 0) {
|
|
/* following stderr, nothing to save */
|
|
CTRACE(DBG_OUTPUT, ("+X\n"));
|
|
return;
|
|
}
|
|
|
|
o = ckmalloc(sizeof(*o));
|
|
o->fd = outx->fd;
|
|
o->flags = OUTPUT_CLONE;
|
|
o->bufsize = outx->bufsize;
|
|
o->nleft = 0;
|
|
o->buf = NULL;
|
|
o->nextc = NULL;
|
|
o->chain = outxtop;
|
|
outx = o;
|
|
outxtop = o;
|
|
|
|
CTRACE(DBG_OUTPUT, ("-> fd=%d flags=%x[CLONE]\n", outx->fd, o->flags));
|
|
}
|
|
|
|
void
|
|
xtrace_pop(void)
|
|
{
|
|
struct output *o;
|
|
|
|
CTRACE(DBG_OUTPUT, ("trace_pop: fd=%d buf=%p nleft=%d flags=%x ",
|
|
outx->fd, outx->buf, outx->nleft, outx->flags));
|
|
|
|
flushout(outx);
|
|
|
|
if (outxtop == NULL) {
|
|
/*
|
|
* No -X has been used, so nothing much to do
|
|
*/
|
|
CTRACE(DBG_OUTPUT, ("+X\n"));
|
|
return;
|
|
}
|
|
|
|
o = outxtop;
|
|
outx = o->chain;
|
|
if (outx == NULL)
|
|
outx = &errout;
|
|
outxtop = o->chain;
|
|
if (o != &errout) {
|
|
if (o->fd >= 0 && !(o->flags & OUTPUT_CLONE))
|
|
sh_close(o->fd);
|
|
if (o->buf)
|
|
ckfree(o->buf);
|
|
ckfree(o);
|
|
}
|
|
|
|
CTRACE(DBG_OUTPUT, ("-> fd=%d buf=%p nleft=%d flags=%x\n",
|
|
outx->fd, outx->buf, outx->nleft, outx->flags));
|
|
}
|
|
#endif /* SMALL */
|