1 files changed, 399 insertions, 0 deletions
diff --git a/usr/dash/output.c b/usr/dash/output.c
new file mode 100644
index 0000000..bb7c6ad
--- /dev/null
+++ b/usr/dash/output.c
@@ -0,0 +1,399 @@
+/*-
+ * 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;
+}