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output.c revision 1.14 
      1 /*	$NetBSD: output.c,v 1.14 1995/05/11 21:29:50 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Kenneth Almquist.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #ifndef lint
     40 #if 0
     41 static char sccsid[] = "@(#)output.c	8.2 (Berkeley) 5/4/95";
     42 #else
     43 static char rcsid[] = "$NetBSD: output.c,v 1.14 1995/05/11 21:29:50 christos Exp $";
     44 #endif
     45 #endif /* not lint */
     46 
     47 /*
     48  * Shell output routines.  We use our own output routines because:
     49  *	When a builtin command is interrupted we have to discard
     50  *		any pending output.
     51  *	When a builtin command appears in back quotes, we want to
     52  *		save the output of the command in a region obtained
     53  *		via malloc, rather than doing a fork and reading the
     54  *		output of the command via a pipe.
     55  *	Our output routines may be smaller than the stdio routines.
     56  */
     57 
     58 #include <sys/ioctl.h>
     59 
     60 #include <stdio.h>	/* defines BUFSIZ */
     61 #include <string.h>
     62 #ifdef __STDC__
     63 #include <stdarg.h>
     64 #else
     65 #include <varargs.h>
     66 #endif
     67 #include <errno.h>
     68 #include <unistd.h>
     69 #include <stdlib.h>
     70 
     71 #include "shell.h"
     72 #include "syntax.h"
     73 #include "output.h"
     74 #include "memalloc.h"
     75 #include "error.h"
     76 
     77 
     78 #define OUTBUFSIZ BUFSIZ
     79 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     80 #define MEM_OUT -3		/* output to dynamically allocated memory */
     81 #define OUTPUT_ERR 01		/* error occurred on output */
     82 
     83 
     84 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     85 struct output errout = {NULL, 0, NULL, 100, 2, 0};;
     86 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     87 struct output *out1 = &output;
     88 struct output *out2 = &errout;
     89 
     90 
     91 
     92 #ifdef mkinit
     93 
     94 INCLUDE "output.h"
     95 INCLUDE "memalloc.h"
     96 
     97 RESET {
     98 	out1 = &output;
     99 	out2 = &errout;
    100 	if (memout.buf != NULL) {
    101 		ckfree(memout.buf);
    102 		memout.buf = NULL;
    103 	}
    104 }
    105 
    106 #endif
    107 
    108 
    109 #ifdef notdef	/* no longer used */
    110 /*
    111  * Set up an output file to write to memory rather than a file.
    112  */
    113 
    114 void
    115 open_mem(block, length, file)
    116 	char *block;
    117 	int length;
    118 	struct output *file;
    119 	{
    120 	file->nextc = block;
    121 	file->nleft = --length;
    122 	file->fd = BLOCK_OUT;
    123 	file->flags = 0;
    124 }
    125 #endif
    126 
    127 
    128 void
    129 out1str(p)
    130 	const char *p;
    131 	{
    132 	outstr(p, out1);
    133 }
    134 
    135 
    136 void
    137 out2str(p)
    138 	const char *p;
    139 	{
    140 	outstr(p, out2);
    141 }
    142 
    143 
    144 void
    145 outstr(p, file)
    146 	register const char *p;
    147 	register struct output *file;
    148 	{
    149 	while (*p)
    150 		outc(*p++, file);
    151 	if (file == out2)
    152 		flushout(file);
    153 }
    154 
    155 
    156 char out_junk[16];
    157 
    158 
    159 void
    160 emptyoutbuf(dest)
    161 	struct output *dest;
    162 	{
    163 	int offset;
    164 
    165 	if (dest->fd == BLOCK_OUT) {
    166 		dest->nextc = out_junk;
    167 		dest->nleft = sizeof out_junk;
    168 		dest->flags |= OUTPUT_ERR;
    169 	} else if (dest->buf == NULL) {
    170 		INTOFF;
    171 		dest->buf = ckmalloc(dest->bufsize);
    172 		dest->nextc = dest->buf;
    173 		dest->nleft = dest->bufsize;
    174 		INTON;
    175 	} else if (dest->fd == MEM_OUT) {
    176 		offset = dest->bufsize;
    177 		INTOFF;
    178 		dest->bufsize <<= 1;
    179 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    180 		dest->nleft = dest->bufsize - offset;
    181 		dest->nextc = dest->buf + offset;
    182 		INTON;
    183 	} else {
    184 		flushout(dest);
    185 	}
    186 	dest->nleft--;
    187 }
    188 
    189 
    190 void
    191 flushall() {
    192 	flushout(&output);
    193 	flushout(&errout);
    194 }
    195 
    196 
    197 void
    198 flushout(dest)
    199 	struct output *dest;
    200 	{
    201 
    202 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    203 		return;
    204 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    205 		dest->flags |= OUTPUT_ERR;
    206 	dest->nextc = dest->buf;
    207 	dest->nleft = dest->bufsize;
    208 }
    209 
    210 
    211 void
    212 freestdout() {
    213 	INTOFF;
    214 	if (output.buf) {
    215 		ckfree(output.buf);
    216 		output.buf = NULL;
    217 		output.nleft = 0;
    218 	}
    219 	INTON;
    220 }
    221 
    222 
    223 #ifdef __STDC__
    224 void
    225 outfmt(struct output *file, char *fmt, ...) {
    226 	va_list ap;
    227 
    228 	va_start(ap, fmt);
    229 	doformat(file, fmt, ap);
    230 	va_end(ap);
    231 }
    232 
    233 
    234 void
    235 out1fmt(char *fmt, ...) {
    236 	va_list ap;
    237 
    238 	va_start(ap, fmt);
    239 	doformat(out1, fmt, ap);
    240 	va_end(ap);
    241 }
    242 
    243 void
    244 dprintf(char *fmt, ...) {
    245 	va_list ap;
    246 
    247 	va_start(ap, fmt);
    248 	doformat(out2, fmt, ap);
    249 	va_end(ap);
    250 	flushout(out2);
    251 }
    252 
    253 void
    254 fmtstr(char *outbuf, int length, char *fmt, ...) {
    255 	va_list ap;
    256 	struct output strout;
    257 
    258 	va_start(ap, fmt);
    259 	strout.nextc = outbuf;
    260 	strout.nleft = length;
    261 	strout.fd = BLOCK_OUT;
    262 	strout.flags = 0;
    263 	doformat(&strout, fmt, ap);
    264 	outc('\0', &strout);
    265 	if (strout.flags & OUTPUT_ERR)
    266 		outbuf[length - 1] = '\0';
    267 }
    268 
    269 #else /* not __STDC__ */
    270 
    271 void
    272 outfmt(va_alist)
    273 	va_dcl
    274 	{
    275 	va_list ap;
    276 	struct output *file;
    277 	char *fmt;
    278 
    279 	va_start(ap);
    280 	file = va_arg(ap, struct output *);
    281 	fmt = va_arg(ap, char *);
    282 	doformat(file, fmt, ap);
    283 	va_end(ap);
    284 }
    285 
    286 
    287 void
    288 out1fmt(va_alist)
    289 	va_dcl
    290 	{
    291 	va_list ap;
    292 	char *fmt;
    293 
    294 	va_start(ap);
    295 	fmt = va_arg(ap, char *);
    296 	doformat(out1, fmt, ap);
    297 	va_end(ap);
    298 }
    299 
    300 void
    301 dprintf(va_alist)
    302 	va_dcl
    303 	{
    304 	va_list ap;
    305 	char *fmt;
    306 
    307 	va_start(ap);
    308 	fmt = va_arg(ap, char *);
    309 	doformat(out2, fmt, ap);
    310 	va_end(ap);
    311 	flushout(out2);
    312 }
    313 
    314 void
    315 fmtstr(va_alist)
    316 	va_dcl
    317 	{
    318 	va_list ap;
    319 	struct output strout;
    320 	char *outbuf;
    321 	int length;
    322 	char *fmt;
    323 
    324 	va_start(ap);
    325 	outbuf = va_arg(ap, char *);
    326 	length = va_arg(ap, int);
    327 	fmt = va_arg(ap, char *);
    328 	strout.nextc = outbuf;
    329 	strout.nleft = length;
    330 	strout.fd = BLOCK_OUT;
    331 	strout.flags = 0;
    332 	doformat(&strout, fmt, ap);
    333 	outc('\0', &strout);
    334 	if (strout.flags & OUTPUT_ERR)
    335 		outbuf[length - 1] = '\0';
    336 }
    337 #endif /* __STDC__ */
    338 
    339 
    340 /*
    341  * Formatted output.  This routine handles a subset of the printf formats:
    342  * - Formats supported: d, u, o, X, s, and c.
    343  * - The x format is also accepted but is treated like X.
    344  * - The l modifier is accepted.
    345  * - The - and # flags are accepted; # only works with the o format.
    346  * - Width and precision may be specified with any format except c.
    347  * - An * may be given for the width or precision.
    348  * - The obsolete practice of preceding the width with a zero to get
    349  *   zero padding is not supported; use the precision field.
    350  * - A % may be printed by writing %% in the format string.
    351  */
    352 
    353 #define TEMPSIZE 24
    354 
    355 #ifdef __STDC__
    356 static const char digit[16] = "0123456789ABCDEF";
    357 #else
    358 static const char digit[17] = "0123456789ABCDEF";
    359 #endif
    360 
    361 
    362 void
    363 doformat(dest, f, ap)
    364 	register struct output *dest;
    365 	register char *f;		/* format string */
    366 	va_list ap;
    367 	{
    368 	register char c;
    369 	char temp[TEMPSIZE];
    370 	int flushleft;
    371 	int sharp;
    372 	int width;
    373 	int prec;
    374 	int islong;
    375 	char *p;
    376 	int sign;
    377 	long l;
    378 	unsigned long num;
    379 	unsigned base;
    380 	int len;
    381 	int size;
    382 	int pad;
    383 
    384 	while ((c = *f++) != '\0') {
    385 		if (c != '%') {
    386 			outc(c, dest);
    387 			continue;
    388 		}
    389 		flushleft = 0;
    390 		sharp = 0;
    391 		width = 0;
    392 		prec = -1;
    393 		islong = 0;
    394 		for (;;) {
    395 			if (*f == '-')
    396 				flushleft++;
    397 			else if (*f == '#')
    398 				sharp++;
    399 			else
    400 				break;
    401 			f++;
    402 		}
    403 		if (*f == '*') {
    404 			width = va_arg(ap, int);
    405 			f++;
    406 		} else {
    407 			while (is_digit(*f)) {
    408 				width = 10 * width + digit_val(*f++);
    409 			}
    410 		}
    411 		if (*f == '.') {
    412 			if (*++f == '*') {
    413 				prec = va_arg(ap, int);
    414 				f++;
    415 			} else {
    416 				prec = 0;
    417 				while (is_digit(*f)) {
    418 					prec = 10 * prec + digit_val(*f++);
    419 				}
    420 			}
    421 		}
    422 		if (*f == 'l') {
    423 			islong++;
    424 			f++;
    425 		}
    426 		switch (*f) {
    427 		case 'd':
    428 			if (islong)
    429 				l = va_arg(ap, long);
    430 			else
    431 				l = va_arg(ap, int);
    432 			sign = 0;
    433 			num = l;
    434 			if (l < 0) {
    435 				num = -l;
    436 				sign = 1;
    437 			}
    438 			base = 10;
    439 			goto number;
    440 		case 'u':
    441 			base = 10;
    442 			goto uns_number;
    443 		case 'o':
    444 			base = 8;
    445 			goto uns_number;
    446 		case 'x':
    447 			/* we don't implement 'x'; treat like 'X' */
    448 		case 'X':
    449 			base = 16;
    450 uns_number:	  /* an unsigned number */
    451 			sign = 0;
    452 			if (islong)
    453 				num = va_arg(ap, unsigned long);
    454 			else
    455 				num = va_arg(ap, unsigned int);
    456 number:		  /* process a number */
    457 			p = temp + TEMPSIZE - 1;
    458 			*p = '\0';
    459 			while (num) {
    460 				*--p = digit[num % base];
    461 				num /= base;
    462 			}
    463 			len = (temp + TEMPSIZE - 1) - p;
    464 			if (prec < 0)
    465 				prec = 1;
    466 			if (sharp && *f == 'o' && prec <= len)
    467 				prec = len + 1;
    468 			pad = 0;
    469 			if (width) {
    470 				size = len;
    471 				if (size < prec)
    472 					size = prec;
    473 				size += sign;
    474 				pad = width - size;
    475 				if (flushleft == 0) {
    476 					while (--pad >= 0)
    477 						outc(' ', dest);
    478 				}
    479 			}
    480 			if (sign)
    481 				outc('-', dest);
    482 			prec -= len;
    483 			while (--prec >= 0)
    484 				outc('0', dest);
    485 			while (*p)
    486 				outc(*p++, dest);
    487 			while (--pad >= 0)
    488 				outc(' ', dest);
    489 			break;
    490 		case 's':
    491 			p = va_arg(ap, char *);
    492 			pad = 0;
    493 			if (width) {
    494 				len = strlen(p);
    495 				if (prec >= 0 && len > prec)
    496 					len = prec;
    497 				pad = width - len;
    498 				if (flushleft == 0) {
    499 					while (--pad >= 0)
    500 						outc(' ', dest);
    501 				}
    502 			}
    503 			prec++;
    504 			while (--prec != 0 && *p)
    505 				outc(*p++, dest);
    506 			while (--pad >= 0)
    507 				outc(' ', dest);
    508 			break;
    509 		case 'c':
    510 			c = va_arg(ap, int);
    511 			outc(c, dest);
    512 			break;
    513 		default:
    514 			outc(*f, dest);
    515 			break;
    516 		}
    517 		f++;
    518 	}
    519 }
    520 
    521 
    522 
    523 /*
    524  * Version of write which resumes after a signal is caught.
    525  */
    526 
    527 int
    528 xwrite(fd, buf, nbytes)
    529 	int fd;
    530 	char *buf;
    531 	int nbytes;
    532 	{
    533 	int ntry;
    534 	int i;
    535 	int n;
    536 
    537 	n = nbytes;
    538 	ntry = 0;
    539 	for (;;) {
    540 		i = write(fd, buf, n);
    541 		if (i > 0) {
    542 			if ((n -= i) <= 0)
    543 				return nbytes;
    544 			buf += i;
    545 			ntry = 0;
    546 		} else if (i == 0) {
    547 			if (++ntry > 10)
    548 				return nbytes - n;
    549 		} else if (errno != EINTR) {
    550 			return -1;
    551 		}
    552 	}
    553 }
    554 
    555 
    556 /*
    557  * Version of ioctl that retries after a signal is caught.
    558  * XXX unused function
    559  */
    560 
    561 int
    562 xioctl(fd, request, arg)
    563 	int fd;
    564 	unsigned long request;
    565 	char * arg;
    566 {
    567 	int i;
    568 
    569 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    570 	return i;
    571 }
    572