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output.c revision 1.19 
      1 /*	$NetBSD: output.c,v 1.19 1997/07/04 21:02:18 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 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)output.c	8.2 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: output.c,v 1.19 1997/07/04 21:02:18 christos Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 /*
     49  * Shell output routines.  We use our own output routines because:
     50  *	When a builtin command is interrupted we have to discard
     51  *		any pending output.
     52  *	When a builtin command appears in back quotes, we want to
     53  *		save the output of the command in a region obtained
     54  *		via malloc, rather than doing a fork and reading the
     55  *		output of the command via a pipe.
     56  *	Our output routines may be smaller than the stdio routines.
     57  */
     58 
     59 #include <sys/types.h>        /* quad_t */
     60 #include <sys/ioctl.h>
     61 
     62 #include <stdio.h>	/* defines BUFSIZ */
     63 #include <string.h>
     64 #include <errno.h>
     65 #include <unistd.h>
     66 #include <stdlib.h>
     67 
     68 #include "shell.h"
     69 #include "syntax.h"
     70 #include "output.h"
     71 #include "memalloc.h"
     72 #include "error.h"
     73 
     74 
     75 #define OUTBUFSIZ BUFSIZ
     76 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     77 #define MEM_OUT -3		/* output to dynamically allocated memory */
     78 #define OUTPUT_ERR 01		/* error occurred on output */
     79 
     80 
     81 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     82 struct output errout = {NULL, 0, NULL, 100, 2, 0};
     83 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     84 struct output *out1 = &output;
     85 struct output *out2 = &errout;
     86 
     87 
     88 
     89 #ifdef mkinit
     90 
     91 INCLUDE "output.h"
     92 INCLUDE "memalloc.h"
     93 
     94 RESET {
     95 	out1 = &output;
     96 	out2 = &errout;
     97 	if (memout.buf != NULL) {
     98 		ckfree(memout.buf);
     99 		memout.buf = NULL;
    100 	}
    101 }
    102 
    103 #endif
    104 
    105 
    106 #ifdef notdef	/* no longer used */
    107 /*
    108  * Set up an output file to write to memory rather than a file.
    109  */
    110 
    111 void
    112 open_mem(block, length, file)
    113 	char *block;
    114 	int length;
    115 	struct output *file;
    116 	{
    117 	file->nextc = block;
    118 	file->nleft = --length;
    119 	file->fd = BLOCK_OUT;
    120 	file->flags = 0;
    121 }
    122 #endif
    123 
    124 
    125 void
    126 out1str(p)
    127 	const char *p;
    128 	{
    129 	outstr(p, out1);
    130 }
    131 
    132 
    133 void
    134 out2str(p)
    135 	const char *p;
    136 	{
    137 	outstr(p, out2);
    138 }
    139 
    140 
    141 void
    142 outstr(p, file)
    143 	const char *p;
    144 	struct output *file;
    145 	{
    146 	while (*p)
    147 		outc(*p++, file);
    148 	if (file == out2)
    149 		flushout(file);
    150 }
    151 
    152 
    153 char out_junk[16];
    154 
    155 
    156 void
    157 emptyoutbuf(dest)
    158 	struct output *dest;
    159 	{
    160 	int offset;
    161 
    162 	if (dest->fd == BLOCK_OUT) {
    163 		dest->nextc = out_junk;
    164 		dest->nleft = sizeof out_junk;
    165 		dest->flags |= OUTPUT_ERR;
    166 	} else if (dest->buf == NULL) {
    167 		INTOFF;
    168 		dest->buf = ckmalloc(dest->bufsize);
    169 		dest->nextc = dest->buf;
    170 		dest->nleft = dest->bufsize;
    171 		INTON;
    172 	} else if (dest->fd == MEM_OUT) {
    173 		offset = dest->bufsize;
    174 		INTOFF;
    175 		dest->bufsize <<= 1;
    176 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    177 		dest->nleft = dest->bufsize - offset;
    178 		dest->nextc = dest->buf + offset;
    179 		INTON;
    180 	} else {
    181 		flushout(dest);
    182 	}
    183 	dest->nleft--;
    184 }
    185 
    186 
    187 void
    188 flushall() {
    189 	flushout(&output);
    190 	flushout(&errout);
    191 }
    192 
    193 
    194 void
    195 flushout(dest)
    196 	struct output *dest;
    197 	{
    198 
    199 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    200 		return;
    201 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    202 		dest->flags |= OUTPUT_ERR;
    203 	dest->nextc = dest->buf;
    204 	dest->nleft = dest->bufsize;
    205 }
    206 
    207 
    208 void
    209 freestdout() {
    210 	INTOFF;
    211 	if (output.buf) {
    212 		ckfree(output.buf);
    213 		output.buf = NULL;
    214 		output.nleft = 0;
    215 	}
    216 	INTON;
    217 }
    218 
    219 
    220 #ifdef __STDC__
    221 void
    222 outfmt(struct output *file, char *fmt, ...) {
    223 	va_list ap;
    224 
    225 	va_start(ap, fmt);
    226 	doformat(file, fmt, ap);
    227 	va_end(ap);
    228 }
    229 
    230 
    231 void
    232 out1fmt(char *fmt, ...) {
    233 	va_list ap;
    234 
    235 	va_start(ap, fmt);
    236 	doformat(out1, fmt, ap);
    237 	va_end(ap);
    238 }
    239 
    240 void
    241 dprintf(char *fmt, ...) {
    242 	va_list ap;
    243 
    244 	va_start(ap, fmt);
    245 	doformat(out2, fmt, ap);
    246 	va_end(ap);
    247 	flushout(out2);
    248 }
    249 
    250 void
    251 fmtstr(char *outbuf, int length, char *fmt, ...) {
    252 	va_list ap;
    253 	struct output strout;
    254 
    255 	va_start(ap, fmt);
    256 	strout.nextc = outbuf;
    257 	strout.nleft = length;
    258 	strout.fd = BLOCK_OUT;
    259 	strout.flags = 0;
    260 	doformat(&strout, fmt, ap);
    261 	outc('\0', &strout);
    262 	if (strout.flags & OUTPUT_ERR)
    263 		outbuf[length - 1] = '\0';
    264 }
    265 
    266 #else /* not __STDC__ */
    267 
    268 void
    269 outfmt(va_alist)
    270 	va_dcl
    271 	{
    272 	va_list ap;
    273 	struct output *file;
    274 	char *fmt;
    275 
    276 	va_start(ap);
    277 	file = va_arg(ap, struct output *);
    278 	fmt = va_arg(ap, char *);
    279 	doformat(file, fmt, ap);
    280 	va_end(ap);
    281 }
    282 
    283 
    284 void
    285 out1fmt(va_alist)
    286 	va_dcl
    287 	{
    288 	va_list ap;
    289 	char *fmt;
    290 
    291 	va_start(ap);
    292 	fmt = va_arg(ap, char *);
    293 	doformat(out1, fmt, ap);
    294 	va_end(ap);
    295 }
    296 
    297 void
    298 dprintf(va_alist)
    299 	va_dcl
    300 	{
    301 	va_list ap;
    302 	char *fmt;
    303 
    304 	va_start(ap);
    305 	fmt = va_arg(ap, char *);
    306 	doformat(out2, fmt, ap);
    307 	va_end(ap);
    308 	flushout(out2);
    309 }
    310 
    311 void
    312 fmtstr(va_alist)
    313 	va_dcl
    314 	{
    315 	va_list ap;
    316 	struct output strout;
    317 	char *outbuf;
    318 	int length;
    319 	char *fmt;
    320 
    321 	va_start(ap);
    322 	outbuf = va_arg(ap, char *);
    323 	length = va_arg(ap, int);
    324 	fmt = va_arg(ap, char *);
    325 	strout.nextc = outbuf;
    326 	strout.nleft = length;
    327 	strout.fd = BLOCK_OUT;
    328 	strout.flags = 0;
    329 	doformat(&strout, fmt, ap);
    330 	outc('\0', &strout);
    331 	if (strout.flags & OUTPUT_ERR)
    332 		outbuf[length - 1] = '\0';
    333 }
    334 #endif /* __STDC__ */
    335 
    336 
    337 /*
    338  * Formatted output.  This routine handles a subset of the printf formats:
    339  * - Formats supported: d, u, o, X, s, and c.
    340  * - The x format is also accepted but is treated like X.
    341  * - The l and q modifiers are accepted.
    342  * - The - and # flags are accepted; # only works with the o format.
    343  * - Width and precision may be specified with any format except c.
    344  * - An * may be given for the width or precision.
    345  * - The obsolete practice of preceding the width with a zero to get
    346  *   zero padding is not supported; use the precision field.
    347  * - A % may be printed by writing %% in the format string.
    348  */
    349 
    350 #define TEMPSIZE 24
    351 
    352 static const char digit[] = "0123456789ABCDEF";
    353 
    354 
    355 void
    356 doformat(dest, f, ap)
    357 	struct output *dest;
    358 	char *f;		/* format string */
    359 	va_list ap;
    360 	{
    361 	char c;
    362 	char temp[TEMPSIZE];
    363 	int flushleft;
    364 	int sharp;
    365 	int width;
    366 	int prec;
    367 	int islong;
    368 	int isquad;
    369 	char *p;
    370 	int sign;
    371 #ifdef BSD4_4
    372 	quad_t l;
    373 	u_quad_t num;
    374 #else
    375 	long l;
    376 	u_long num;
    377 #endif
    378 	unsigned base;
    379 	int len;
    380 	int size;
    381 	int pad;
    382 
    383 	while ((c = *f++) != '\0') {
    384 		if (c != '%') {
    385 			outc(c, dest);
    386 			continue;
    387 		}
    388 		flushleft = 0;
    389 		sharp = 0;
    390 		width = 0;
    391 		prec = -1;
    392 		islong = 0;
    393 		isquad = 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 		} else if (*f == 'q') {
    426 			isquad++;
    427 			f++;
    428 		}
    429 		switch (*f) {
    430 		case 'd':
    431 #ifdef BSD4_4
    432 			if (isquad)
    433 				l = va_arg(ap, quad_t);
    434 			else
    435 #endif
    436 			if (islong)
    437 				l = va_arg(ap, long);
    438 			else
    439 				l = va_arg(ap, int);
    440 			sign = 0;
    441 			num = l;
    442 			if (l < 0) {
    443 				num = -l;
    444 				sign = 1;
    445 			}
    446 			base = 10;
    447 			goto number;
    448 		case 'u':
    449 			base = 10;
    450 			goto uns_number;
    451 		case 'o':
    452 			base = 8;
    453 			goto uns_number;
    454 		case 'x':
    455 			/* we don't implement 'x'; treat like 'X' */
    456 		case 'X':
    457 			base = 16;
    458 uns_number:	  /* an unsigned number */
    459 			sign = 0;
    460 #ifdef BSD4_4
    461 			if (isquad)
    462 				num = va_arg(ap, u_quad_t);
    463 			else
    464 #endif
    465 			if (islong)
    466 				num = va_arg(ap, unsigned long);
    467 			else
    468 				num = va_arg(ap, unsigned int);
    469 number:		  /* process a number */
    470 			p = temp + TEMPSIZE - 1;
    471 			*p = '\0';
    472 			while (num) {
    473 				*--p = digit[num % base];
    474 				num /= base;
    475 			}
    476 			len = (temp + TEMPSIZE - 1) - p;
    477 			if (prec < 0)
    478 				prec = 1;
    479 			if (sharp && *f == 'o' && prec <= len)
    480 				prec = len + 1;
    481 			pad = 0;
    482 			if (width) {
    483 				size = len;
    484 				if (size < prec)
    485 					size = prec;
    486 				size += sign;
    487 				pad = width - size;
    488 				if (flushleft == 0) {
    489 					while (--pad >= 0)
    490 						outc(' ', dest);
    491 				}
    492 			}
    493 			if (sign)
    494 				outc('-', dest);
    495 			prec -= len;
    496 			while (--prec >= 0)
    497 				outc('0', dest);
    498 			while (*p)
    499 				outc(*p++, dest);
    500 			while (--pad >= 0)
    501 				outc(' ', dest);
    502 			break;
    503 		case 's':
    504 			p = va_arg(ap, char *);
    505 			pad = 0;
    506 			if (width) {
    507 				len = strlen(p);
    508 				if (prec >= 0 && len > prec)
    509 					len = prec;
    510 				pad = width - len;
    511 				if (flushleft == 0) {
    512 					while (--pad >= 0)
    513 						outc(' ', dest);
    514 				}
    515 			}
    516 			prec++;
    517 			while (--prec != 0 && *p)
    518 				outc(*p++, dest);
    519 			while (--pad >= 0)
    520 				outc(' ', dest);
    521 			break;
    522 		case 'c':
    523 			c = va_arg(ap, int);
    524 			outc(c, dest);
    525 			break;
    526 		default:
    527 			outc(*f, dest);
    528 			break;
    529 		}
    530 		f++;
    531 	}
    532 }
    533 
    534 
    535 
    536 /*
    537  * Version of write which resumes after a signal is caught.
    538  */
    539 
    540 int
    541 xwrite(fd, buf, nbytes)
    542 	int fd;
    543 	char *buf;
    544 	int nbytes;
    545 	{
    546 	int ntry;
    547 	int i;
    548 	int n;
    549 
    550 	n = nbytes;
    551 	ntry = 0;
    552 	for (;;) {
    553 		i = write(fd, buf, n);
    554 		if (i > 0) {
    555 			if ((n -= i) <= 0)
    556 				return nbytes;
    557 			buf += i;
    558 			ntry = 0;
    559 		} else if (i == 0) {
    560 			if (++ntry > 10)
    561 				return nbytes - n;
    562 		} else if (errno != EINTR) {
    563 			return -1;
    564 		}
    565 	}
    566 }
    567 
    568 
    569 /*
    570  * Version of ioctl that retries after a signal is caught.
    571  * XXX unused function
    572  */
    573 
    574 int
    575 xioctl(fd, request, arg)
    576 	int fd;
    577 	unsigned long request;
    578 	char * arg;
    579 {
    580 	int i;
    581 
    582 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    583 	return i;
    584 }
    585