blob: f62e7eab0b4eb4eae0e76a1a9d16b52674fc6d81 [file] [log] [blame]
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1997-2005
* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Shell output routines. We use our own output routines because:
* When a builtin command is interrupted we have to discard
* any pending output.
* When a builtin command appears in back quotes, we want to
* save the output of the command in a region obtained
* via malloc, rather than doing a fork and reading the
* output of the command via a pipe.
* Our output routines may be smaller than the stdio routines.
*/
#include <sys/types.h> /* quad_t */
#include <sys/param.h> /* BSD4_4 */
#include <sys/ioctl.h>
#include <stdio.h> /* defines BUFSIZ */
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef USE_GLIBC_STDIO
#include <fcntl.h>
#endif
#include <limits.h>
#include "shell.h"
#include "syntax.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "main.h"
#include "system.h"
#define OUTBUFSIZ BUFSIZ
#define MEM_OUT -3 /* output to dynamically allocated memory */
#ifdef USE_GLIBC_STDIO
struct output output = {
stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 1, flags: 0
};
struct output errout = {
stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 2, flags: 0
}
#ifdef notyet
struct output memout = {
stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: MEM_OUT, flags: 0
};
#endif
#else
struct output output = {
nextc: 0, end: 0, buf: 0, bufsize: OUTBUFSIZ, fd: 1, flags: 0
};
struct output errout = {
nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 2, flags: 0
};
struct output preverrout;
#ifdef notyet
struct output memout = {
nextc: 0, end: 0, buf: 0, bufsize: 0, fd: MEM_OUT, flags: 0
};
#endif
#endif
struct output *out1 = &output;
struct output *out2 = &errout;
#ifndef USE_GLIBC_STDIO
static void __outstr(const char *, size_t, struct output *);
#endif
static int xvsnprintf(char *, size_t, const char *, va_list);
#ifdef mkinit
INCLUDE "output.h"
INCLUDE "memalloc.h"
INIT {
#ifdef USE_GLIBC_STDIO
initstreams();
#endif
}
RESET {
#ifdef notyet
out1 = &output;
out2 = &errout;
#ifdef USE_GLIBC_STDIO
if (memout.stream != NULL)
__closememout();
#endif
if (memout.buf != NULL) {
ckfree(memout.buf);
memout.buf = NULL;
}
#endif
}
#endif
#ifndef USE_GLIBC_STDIO
static void
__outstr(const char *p, size_t len, struct output *dest)
{
size_t bufsize;
size_t offset;
size_t nleft;
nleft = dest->end - dest->nextc;
if (nleft >= len) {
buffered:
dest->nextc = mempcpy(dest->nextc, p, len);
return;
}
bufsize = dest->bufsize;
if (!bufsize) {
;
} else if (dest->buf == NULL) {
if (dest->fd == MEM_OUT && len > bufsize) {
bufsize = len;
}
offset = 0;
goto alloc;
} else if (dest->fd == MEM_OUT) {
offset = bufsize;
if (bufsize >= len) {
bufsize <<= 1;
} else {
bufsize += len;
}
if (bufsize < offset)
goto err;
alloc:
INTOFF;
dest->buf = ckrealloc(dest->buf, bufsize);
dest->bufsize = bufsize;
dest->end = dest->buf + bufsize;
dest->nextc = dest->buf + offset;
INTON;
} else {
flushout(dest);
}
nleft = dest->end - dest->nextc;
if (nleft > len)
goto buffered;
if ((xwrite(dest->fd, p, len))) {
err:
dest->flags |= OUTPUT_ERR;
}
}
#endif
void
outstr(const char *p, struct output *file)
{
#ifdef USE_GLIBC_STDIO
INTOFF;
fputs(p, file->stream);
INTON;
#else
size_t len;
len = strlen(p);
__outstr(p, len, file);
#endif
}
#ifndef USE_GLIBC_STDIO
void
outcslow(int c, struct output *dest)
{
char buf = c;
__outstr(&buf, 1, dest);
}
#endif
void
flushall(void)
{
flushout(&output);
#ifdef FLUSHERR
flushout(&errout);
#endif
}
void
flushout(struct output *dest)
{
#ifdef USE_GLIBC_STDIO
INTOFF;
fflush(dest->stream);
INTON;
#else
size_t len;
len = dest->nextc - dest->buf;
if (!len || dest->fd < 0)
return;
dest->nextc = dest->buf;
if ((xwrite(dest->fd, dest->buf, len)))
dest->flags |= OUTPUT_ERR;
#endif
}
void
outfmt(struct output *file, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
doformat(file, fmt, ap);
va_end(ap);
}
void
out1fmt(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
doformat(out1, fmt, ap);
va_end(ap);
}
int
fmtstr(char *outbuf, size_t length, const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = xvsnprintf(outbuf, length, fmt, ap);
va_end(ap);
return ret;
}
#ifndef USE_GLIBC_STDIO
void
doformat(struct output *dest, const char *f, va_list ap)
{
struct stackmark smark;
char *s;
int len, ret;
size_t size;
va_list ap2;
va_copy(ap2, ap);
size = dest->end - dest->nextc;
len = xvsnprintf(dest->nextc, size, f, ap2);
va_end(ap2);
if (len < 0) {
dest->flags |= OUTPUT_ERR;
return;
}
if (len < size) {
dest->nextc += len;
return;
}
setstackmark(&smark);
s = stalloc((len >= stackblocksize() ? len : stackblocksize()) + 1);
ret = xvsnprintf(s, len + 1, f, ap);
if (ret == len)
__outstr(s, len, dest);
else
dest->flags |= OUTPUT_ERR;
popstackmark(&smark);
}
#endif
/*
* Version of write which resumes after a signal is caught.
*/
int
xwrite(int fd, const void *p, size_t n)
{
const char *buf = p;
while (n) {
ssize_t i;
size_t m;
m = n;
if (m > SSIZE_MAX)
m = SSIZE_MAX;
do {
i = write(fd, buf, m);
} while (i < 0 && errno == EINTR);
if (i < 0)
return -1;
buf += i;
n -= i;
}
return 0;
}
#ifdef notyet
#ifdef USE_GLIBC_STDIO
void initstreams() {
output.stream = stdout;
errout.stream = stderr;
}
void
openmemout(void) {
INTOFF;
memout.stream = open_memstream(&memout.buf, &memout.bufsize);
INTON;
}
int
__closememout(void) {
int error;
error = fclose(memout.stream);
memout.stream = NULL;
return error;
}
#endif
#endif
static int
xvsnprintf(char *outbuf, size_t length, const char *fmt, va_list ap)
{
int ret;
#ifdef __sun
/*
* vsnprintf() on older versions of Solaris returns -1 when
* passed a length of 0. To avoid this, use a dummy
* 1-character buffer instead.
*/
char dummy[1];
if (length == 0) {
outbuf = dummy;
length = sizeof(dummy);
}
#endif
INTOFF;
ret = vsnprintf(outbuf, length, fmt, ap);
INTON;
return ret;
}