29717eb029
Allocating and deallocating repeatedly the 1024-byte buffer for stdout from builtins costs CPU time for little or no benefit. A simple loop containing builtins that write to a file descriptor, such as i=0; while [ "$i" -lt 1000000 ]; do printf .; i=$((i+1)); done >/dev/null is over 10% faster in a simple benchmark on an amd64 virtual machine.
369 lines
7.1 KiB
C
369 lines
7.1 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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* 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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#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 <wchar.h>
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#include <wctype.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 MEM_OUT -2 /* 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, NULL, NULL, OUTBUFSIZ, 1, 0};
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struct output errout = {NULL, NULL, NULL, 256, 2, 0};
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struct output memout = {NULL, NULL, NULL, 64, MEM_OUT, 0};
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struct output *out1 = &output;
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struct output *out2 = &errout;
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void
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outcslow(int c, struct output *file)
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{
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outc(c, file);
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}
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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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outbin(p, strlen(p), file);
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}
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static void
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byteseq(int ch, struct output *file)
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{
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char seq[4];
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seq[0] = '\\';
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seq[1] = (ch >> 6 & 0x3) + '0';
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seq[2] = (ch >> 3 & 0x7) + '0';
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seq[3] = (ch & 0x7) + '0';
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outbin(seq, 4, file);
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}
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static void
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outdqstr(const char *p, struct output *file)
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{
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const char *end;
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mbstate_t mbs;
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size_t clen;
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wchar_t wc;
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memset(&mbs, '\0', sizeof(mbs));
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end = p + strlen(p);
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outstr("$'", file);
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while ((clen = mbrtowc(&wc, p, end - p + 1, &mbs)) != 0) {
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if (clen == (size_t)-2) {
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while (p < end)
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byteseq(*p++, file);
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break;
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}
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if (clen == (size_t)-1) {
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memset(&mbs, '\0', sizeof(mbs));
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byteseq(*p++, file);
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continue;
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}
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if (wc == L'\n')
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outcslow('\n', file), p++;
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else if (wc == L'\r')
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outstr("\\r", file), p++;
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else if (wc == L'\t')
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outstr("\\t", file), p++;
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else if (!iswprint(wc)) {
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for (; clen > 0; clen--)
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byteseq(*p++, file);
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} else {
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if (wc == L'\'' || wc == L'\\')
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outcslow('\\', file);
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outbin(p, clen, file);
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p += clen;
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}
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}
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outcslow('\'', 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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int i;
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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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for (i = 0; p[i] != '\0'; i++) {
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if ((p[i] > '\0' && p[i] < ' ' && p[i] != '\n') ||
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(p[i] & 0x80) != 0 || p[i] == '\'') {
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outdqstr(p, file);
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return;
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}
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}
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if (p[strcspn(p, "|&;<>()$`\\\" \n*?[~#=")] == '\0' ||
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strcmp(p, "[") == 0) {
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outstr(p, file);
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return;
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}
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outcslow('\'', file);
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outstr(p, file);
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outcslow('\'', file);
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}
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void
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outbin(const void *data, size_t len, struct output *file)
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{
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const char *p;
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p = data;
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while (len-- > 0)
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outc(*p++, file);
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}
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void
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emptyoutbuf(struct output *dest)
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{
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int offset, newsize;
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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->bufend = dest->buf + dest->bufsize;
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INTON;
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} else if (dest->fd == MEM_OUT) {
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offset = dest->nextc - dest->buf;
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newsize = dest->bufsize << 1;
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INTOFF;
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dest->buf = ckrealloc(dest->buf, newsize);
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dest->bufsize = newsize;
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dest->bufend = dest->buf + newsize;
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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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}
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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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}
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void
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freestdout(void)
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{
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output.nextc = output.buf;
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}
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int
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outiserror(struct output *file)
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{
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return (file->flags & OUTPUT_ERR);
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}
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void
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outclearerror(struct output *file)
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{
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file->flags &= ~OUTPUT_ERR;
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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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out2fmt_flush(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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INTOFF;
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va_start(ap, fmt);
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vsnprintf(outbuf, length, fmt, ap);
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va_end(ap);
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INTON;
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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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o = (struct output *)cookie;
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outbin(buf, len, o);
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return (len);
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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, const 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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