minix/commands/ash/output.c
2009-11-09 10:26:00 +00:00

581 lines
11 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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.
* 4. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
/*
* 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 <stdio.h> /* defines BUFSIZ */
#include "shell.h"
#include "syntax.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "var.h"
#ifdef __STDC__
#include "stdarg.h"
#else
#include <varargs.h>
#endif
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#define OUTBUFSIZ BUFSIZ
#define BLOCK_OUT -2 /* output to a fixed block of memory */
#define MEM_OUT -3 /* output to dynamically allocated memory */
#define OUTPUT_ERR 01 /* error occurred on output */
struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
struct output errout = {NULL, 0, NULL, 100, 2, 0};
struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
struct output *out1 = &output;
struct output *out2 = &errout;
#ifdef mkinit
INCLUDE "output.h"
INCLUDE "memalloc.h"
RESET {
out1 = &output;
out2 = &errout;
if (memout.buf != NULL) {
ckfree(memout.buf);
memout.buf = NULL;
}
}
#endif
#ifdef notdef /* no longer used */
/*
* Set up an output file to write to memory rather than a file.
*/
void
open_mem(block, length, file)
char *block;
int length;
struct output *file;
{
file->nextc = block;
file->nleft = --length;
file->fd = BLOCK_OUT;
file->flags = 0;
}
#endif
void
out1str(p)
const char *p;
{
outstr(p, out1);
}
void
out1qstr(const char *p)
{
outqstr(p, out1);
}
void
out2str(const char *p)
{
outstr(p, out2);
}
void
outstr(p, file)
register const char *p;
register struct output *file;
{
while (*p)
outc(*p++, file);
if (file == out2)
flushout(file);
}
/* Like outstr(), but quote for re-input into the shell. */
void
outqstr(const char *p, struct output *file)
{
char ch;
if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() ||
p[strcspn(p, ifsval())] == '\0')) {
outstr(p, file);
return;
}
out1c('\'');
while ((ch = *p++) != '\0') {
switch (ch) {
case '\'':
/*
* Can't quote single quotes inside single quotes;
* close them, write escaped single quote, open again.
*/
outstr("'\\''", file);
break;
default:
outc(ch, file);
}
}
out1c('\'');
}
char out_junk[16];
void
emptyoutbuf(dest)
struct output *dest;
{
int offset;
if (dest->fd == BLOCK_OUT) {
dest->nextc = out_junk;
dest->nleft = sizeof out_junk;
dest->flags |= OUTPUT_ERR;
} else if (dest->buf == NULL) {
INTOFF;
dest->buf = ckmalloc(dest->bufsize);
dest->nextc = dest->buf;
dest->nleft = dest->bufsize;
INTON;
} else if (dest->fd == MEM_OUT) {
offset = dest->bufsize;
INTOFF;
dest->bufsize <<= 1;
dest->buf = ckrealloc(dest->buf, dest->bufsize);
dest->nleft = dest->bufsize - offset;
dest->nextc = dest->buf + offset;
INTON;
} else {
flushout(dest);
}
dest->nleft--;
}
void
flushall() {
flushout(&output);
flushout(&errout);
}
void
flushout(dest)
struct output *dest;
{
if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
return;
if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
dest->flags |= OUTPUT_ERR;
dest->nextc = dest->buf;
dest->nleft = dest->bufsize;
}
void
freestdout() {
INTOFF;
if (output.buf) {
ckfree(output.buf);
output.buf = NULL;
output.nleft = 0;
}
INTON;
}
#ifdef __STDC__
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);
}
void
dprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
doformat(out2, fmt, ap);
va_end(ap);
flushout(out2);
}
void
fmtstr(char *outbuf, int length, const char *fmt, ...)
{
va_list ap;
struct output strout;
va_start(ap, fmt);
strout.nextc = outbuf;
strout.nleft = length;
strout.fd = BLOCK_OUT;
strout.flags = 0;
doformat(&strout, fmt, ap);
outc('\0', &strout);
if (strout.flags & OUTPUT_ERR)
outbuf[length - 1] = '\0';
va_end(ap);
}
#else /* not __STDC__ */
void
outfmt(va_alist)
va_dcl
{
va_list ap;
struct output *file;
char *fmt;
va_start(ap);
file = va_arg(ap, struct output *);
fmt = va_arg(ap, char *);
doformat(file, fmt, ap);
va_end(ap);
}
void
out1fmt(va_alist)
va_dcl
{
va_list ap;
char *fmt;
va_start(ap);
fmt = va_arg(ap, char *);
doformat(out1, fmt, ap);
va_end(ap);
}
void
dprintf(va_alist)
va_dcl
{
va_list ap;
char *fmt;
va_start(ap);
fmt = va_arg(ap, char *);
doformat(out2, fmt, ap);
va_end(ap);
flushout(out2);
}
void
fmtstr(va_alist)
va_dcl
{
va_list ap;
struct output strout;
char *outbuf;
int length;
char *fmt;
va_start(ap);
outbuf = va_arg(ap, char *);
length = va_arg(ap, int);
fmt = va_arg(ap, char *);
strout.nextc = outbuf;
strout.nleft = length;
strout.fd = BLOCK_OUT;
strout.flags = 0;
doformat(&strout, fmt, ap);
outc('\0', &strout);
if (strout.flags & OUTPUT_ERR)
outbuf[length - 1] = '\0';
}
#endif /* __STDC__ */
/*
* Formatted output. This routine handles a subset of the printf formats:
* - Formats supported: d, u, o, X, s, and c.
* - The x format is also accepted but is treated like X.
* - The l modifier is accepted.
* - The - and # flags are accepted; # only works with the o format.
* - Width and precision may be specified with any format except c.
* - An * may be given for the width or precision.
* - The obsolete practice of preceding the width with a zero to get
* zero padding is not supported; use the precision field.
* - A % may be printed by writing %% in the format string.
*/
#define TEMPSIZE 24
#ifdef __STDC__
static const char digit[16] = "0123456789ABCDEF";
#else
static const char digit[17] = "0123456789ABCDEF";
#endif
void
doformat(struct output *dest, const char *f, va_list ap)
{
register char c;
char temp[TEMPSIZE];
int flushleft;
int sharp;
int width;
int prec;
int islong;
char *p;
int sign;
long l;
unsigned long num;
unsigned base;
int len;
int size;
int pad;
while ((c = *f++) != '\0') {
if (c != '%') {
outc(c, dest);
continue;
}
flushleft = 0;
sharp = 0;
width = 0;
prec = -1;
islong = 0;
for (;;) {
if (*f == '-')
flushleft++;
else if (*f == '#')
sharp++;
else
break;
f++;
}
if (*f == '*') {
width = va_arg(ap, int);
f++;
} else {
while (is_digit(*f)) {
width = 10 * width + digit_val(*f++);
}
}
if (*f == '.') {
if (*++f == '*') {
prec = va_arg(ap, int);
f++;
} else {
prec = 0;
while (is_digit(*f)) {
prec = 10 * prec + digit_val(*f++);
}
}
}
if (*f == 'l') {
islong++;
f++;
}
switch (*f) {
case 'd':
if (islong)
l = va_arg(ap, long);
else
l = va_arg(ap, int);
sign = 0;
num = l;
if (l < 0) {
num = -l;
sign = 1;
}
base = 10;
goto number;
case 'u':
base = 10;
goto uns_number;
case 'o':
base = 8;
goto uns_number;
case 'x':
/* we don't implement 'x'; treat like 'X' */
case 'X':
base = 16;
uns_number: /* an unsigned number */
sign = 0;
if (islong)
num = va_arg(ap, unsigned long);
else
num = va_arg(ap, unsigned int);
number: /* process a number */
p = temp + TEMPSIZE - 1;
*p = '\0';
while (num) {
*--p = digit[num % base];
num /= base;
}
len = (temp + TEMPSIZE - 1) - p;
if (prec < 0)
prec = 1;
if (sharp && *f == 'o' && prec <= len)
prec = len + 1;
pad = 0;
if (width) {
size = len;
if (size < prec)
size = prec;
size += sign;
pad = width - size;
if (flushleft == 0) {
while (--pad >= 0)
outc(' ', dest);
}
}
if (sign)
outc('-', dest);
prec -= len;
while (--prec >= 0)
outc('0', dest);
while (*p)
outc(*p++, dest);
while (--pad >= 0)
outc(' ', dest);
break;
case 's':
p = va_arg(ap, char *);
pad = 0;
if (width) {
len = strlen(p);
if (prec >= 0 && len > prec)
len = prec;
pad = width - len;
if (flushleft == 0) {
while (--pad >= 0)
outc(' ', dest);
}
}
prec++;
while (--prec != 0 && *p)
outc(*p++, dest);
while (--pad >= 0)
outc(' ', dest);
break;
case 'c':
c = va_arg(ap, int);
outc(c, dest);
break;
default:
outc(*f, dest);
break;
}
f++;
}
}
/*
* Version of write which resumes after a signal is caught.
*/
int
xwrite(fd, buf, nbytes)
int fd;
char *buf;
int nbytes;
{
int ntry;
int i;
int n;
n = nbytes;
ntry = 0;
for (;;) {
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;
}
}
}
/*
* $PchId: output.c,v 1.6 2006/05/22 12:46:03 philip Exp $
*/