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output.c revision 1.18 
      1 /*	$NetBSD: output.c,v 1.18 1997/04/11 23:05:43 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 1.18 1997/04/11 23:05:43 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/types.h>        /* quad_t */
     59 #include <sys/ioctl.h>
     60 
     61 #include <stdio.h>	/* defines BUFSIZ */
     62 #include <string.h>
     63 #include <errno.h>
     64 #include <unistd.h>
     65 #include <stdlib.h>
     66 
     67 #include "shell.h"
     68 #include "syntax.h"
     69 #include "output.h"
     70 #include "memalloc.h"
     71 #include "error.h"
     72 
     73 
     74 #define OUTBUFSIZ BUFSIZ
     75 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     76 #define MEM_OUT -3		/* output to dynamically allocated memory */
     77 #define OUTPUT_ERR 01		/* error occurred on output */
     78 
     79 
     80 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     81 struct output errout = {NULL, 0, NULL, 100, 2, 0};
     82 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     83 struct output *out1 = &output;
     84 struct output *out2 = &errout;
     85 
     86 
     87 
     88 #ifdef mkinit
     89 
     90 INCLUDE "output.h"
     91 INCLUDE "memalloc.h"
     92 
     93 RESET {
     94 	out1 = &output;
     95 	out2 = &errout;
     96 	if (memout.buf != NULL) {
     97 		ckfree(memout.buf);
     98 		memout.buf = NULL;
     99 	}
    100 }
    101 
    102 #endif
    103 
    104 
    105 #ifdef notdef	/* no longer used */
    106 /*
    107  * Set up an output file to write to memory rather than a file.
    108  */
    109 
    110 void
    111 open_mem(block, length, file)
    112 	char *block;
    113 	int length;
    114 	struct output *file;
    115 	{
    116 	file->nextc = block;
    117 	file->nleft = --length;
    118 	file->fd = BLOCK_OUT;
    119 	file->flags = 0;
    120 }
    121 #endif
    122 
    123 
    124 void
    125 out1str(p)
    126 	const char *p;
    127 	{
    128 	outstr(p, out1);
    129 }
    130 
    131 
    132 void
    133 out2str(p)
    134 	const char *p;
    135 	{
    136 	outstr(p, out2);
    137 }
    138 
    139 
    140 void
    141 outstr(p, file)
    142 	const char *p;
    143 	struct output *file;
    144 	{
    145 	while (*p)
    146 		outc(*p++, file);
    147 	if (file == out2)
    148 		flushout(file);
    149 }
    150 
    151 
    152 char out_junk[16];
    153 
    154 
    155 void
    156 emptyoutbuf(dest)
    157 	struct output *dest;
    158 	{
    159 	int offset;
    160 
    161 	if (dest->fd == BLOCK_OUT) {
    162 		dest->nextc = out_junk;
    163 		dest->nleft = sizeof out_junk;
    164 		dest->flags |= OUTPUT_ERR;
    165 	} else if (dest->buf == NULL) {
    166 		INTOFF;
    167 		dest->buf = ckmalloc(dest->bufsize);
    168 		dest->nextc = dest->buf;
    169 		dest->nleft = dest->bufsize;
    170 		INTON;
    171 	} else if (dest->fd == MEM_OUT) {
    172 		offset = dest->bufsize;
    173 		INTOFF;
    174 		dest->bufsize <<= 1;
    175 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    176 		dest->nleft = dest->bufsize - offset;
    177 		dest->nextc = dest->buf + offset;
    178 		INTON;
    179 	} else {
    180 		flushout(dest);
    181 	}
    182 	dest->nleft--;
    183 }
    184 
    185 
    186 void
    187 flushall() {
    188 	flushout(&output);
    189 	flushout(&errout);
    190 }
    191 
    192 
    193 void
    194 flushout(dest)
    195 	struct output *dest;
    196 	{
    197 
    198 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    199 		return;
    200 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    201 		dest->flags |= OUTPUT_ERR;
    202 	dest->nextc = dest->buf;
    203 	dest->nleft = dest->bufsize;
    204 }
    205 
    206 
    207 void
    208 freestdout() {
    209 	INTOFF;
    210 	if (output.buf) {
    211 		ckfree(output.buf);
    212 		output.buf = NULL;
    213 		output.nleft = 0;
    214 	}
    215 	INTON;
    216 }
    217 
    218 
    219 #ifdef __STDC__
    220 void
    221 outfmt(struct output *file, char *fmt, ...) {
    222 	va_list ap;
    223 
    224 	va_start(ap, fmt);
    225 	doformat(file, fmt, ap);
    226 	va_end(ap);
    227 }
    228 
    229 
    230 void
    231 out1fmt(char *fmt, ...) {
    232 	va_list ap;
    233 
    234 	va_start(ap, fmt);
    235 	doformat(out1, fmt, ap);
    236 	va_end(ap);
    237 }
    238 
    239 void
    240 dprintf(char *fmt, ...) {
    241 	va_list ap;
    242 
    243 	va_start(ap, fmt);
    244 	doformat(out2, fmt, ap);
    245 	va_end(ap);
    246 	flushout(out2);
    247 }
    248 
    249 void
    250 fmtstr(char *outbuf, int length, char *fmt, ...) {
    251 	va_list ap;
    252 	struct output strout;
    253 
    254 	va_start(ap, fmt);
    255 	strout.nextc = outbuf;
    256 	strout.nleft = length;
    257 	strout.fd = BLOCK_OUT;
    258 	strout.flags = 0;
    259 	doformat(&strout, fmt, ap);
    260 	outc('\0', &strout);
    261 	if (strout.flags & OUTPUT_ERR)
    262 		outbuf[length - 1] = '\0';
    263 }
    264 
    265 #else /* not __STDC__ */
    266 
    267 void
    268 outfmt(va_alist)
    269 	va_dcl
    270 	{
    271 	va_list ap;
    272 	struct output *file;
    273 	char *fmt;
    274 
    275 	va_start(ap);
    276 	file = va_arg(ap, struct output *);
    277 	fmt = va_arg(ap, char *);
    278 	doformat(file, fmt, ap);
    279 	va_end(ap);
    280 }
    281 
    282 
    283 void
    284 out1fmt(va_alist)
    285 	va_dcl
    286 	{
    287 	va_list ap;
    288 	char *fmt;
    289 
    290 	va_start(ap);
    291 	fmt = va_arg(ap, char *);
    292 	doformat(out1, fmt, ap);
    293 	va_end(ap);
    294 }
    295 
    296 void
    297 dprintf(va_alist)
    298 	va_dcl
    299 	{
    300 	va_list ap;
    301 	char *fmt;
    302 
    303 	va_start(ap);
    304 	fmt = va_arg(ap, char *);
    305 	doformat(out2, fmt, ap);
    306 	va_end(ap);
    307 	flushout(out2);
    308 }
    309 
    310 void
    311 fmtstr(va_alist)
    312 	va_dcl
    313 	{
    314 	va_list ap;
    315 	struct output strout;
    316 	char *outbuf;
    317 	int length;
    318 	char *fmt;
    319 
    320 	va_start(ap);
    321 	outbuf = va_arg(ap, char *);
    322 	length = va_arg(ap, int);
    323 	fmt = va_arg(ap, char *);
    324 	strout.nextc = outbuf;
    325 	strout.nleft = length;
    326 	strout.fd = BLOCK_OUT;
    327 	strout.flags = 0;
    328 	doformat(&strout, fmt, ap);
    329 	outc('\0', &strout);
    330 	if (strout.flags & OUTPUT_ERR)
    331 		outbuf[length - 1] = '\0';
    332 }
    333 #endif /* __STDC__ */
    334 
    335 
    336 /*
    337  * Formatted output.  This routine handles a subset of the printf formats:
    338  * - Formats supported: d, u, o, X, s, and c.
    339  * - The x format is also accepted but is treated like X.
    340  * - The l and q modifiers are accepted.
    341  * - The - and # flags are accepted; # only works with the o format.
    342  * - Width and precision may be specified with any format except c.
    343  * - An * may be given for the width or precision.
    344  * - The obsolete practice of preceding the width with a zero to get
    345  *   zero padding is not supported; use the precision field.
    346  * - A % may be printed by writing %% in the format string.
    347  */
    348 
    349 #define TEMPSIZE 24
    350 
    351 static const char digit[] = "0123456789ABCDEF";
    352 
    353 
    354 void
    355 doformat(dest, f, ap)
    356 	struct output *dest;
    357 	char *f;		/* format string */
    358 	va_list ap;
    359 	{
    360 	char c;
    361 	char temp[TEMPSIZE];
    362 	int flushleft;
    363 	int sharp;
    364 	int width;
    365 	int prec;
    366 	int islong;
    367 	int isquad;
    368 	char *p;
    369 	int sign;
    370 #ifdef BSD4_4
    371 	quad_t l;
    372 	u_quad_t num;
    373 #else
    374 	long l;
    375 	u_long num;
    376 #endif
    377 	unsigned base;
    378 	int len;
    379 	int size;
    380 	int pad;
    381 
    382 	while ((c = *f++) != '\0') {
    383 		if (c != '%') {
    384 			outc(c, dest);
    385 			continue;
    386 		}
    387 		flushleft = 0;
    388 		sharp = 0;
    389 		width = 0;
    390 		prec = -1;
    391 		islong = 0;
    392 		isquad = 0;
    393 		for (;;) {
    394 			if (*f == '-')
    395 				flushleft++;
    396 			else if (*f == '#')
    397 				sharp++;
    398 			else
    399 				break;
    400 			f++;
    401 		}
    402 		if (*f == '*') {
    403 			width = va_arg(ap, int);
    404 			f++;
    405 		} else {
    406 			while (is_digit(*f)) {
    407 				width = 10 * width + digit_val(*f++);
    408 			}
    409 		}
    410 		if (*f == '.') {
    411 			if (*++f == '*') {
    412 				prec = va_arg(ap, int);
    413 				f++;
    414 			} else {
    415 				prec = 0;
    416 				while (is_digit(*f)) {
    417 					prec = 10 * prec + digit_val(*f++);
    418 				}
    419 			}
    420 		}
    421 		if (*f == 'l') {
    422 			islong++;
    423 			f++;
    424 		} else if (*f == 'q') {
    425 			isquad++;
    426 			f++;
    427 		}
    428 		switch (*f) {
    429 		case 'd':
    430 #ifdef BSD4_4
    431 			if (isquad)
    432 				l = va_arg(ap, quad_t);
    433 			else
    434 #endif
    435 			if (islong)
    436 				l = va_arg(ap, long);
    437 			else
    438 				l = va_arg(ap, int);
    439 			sign = 0;
    440 			num = l;
    441 			if (l < 0) {
    442 				num = -l;
    443 				sign = 1;
    444 			}
    445 			base = 10;
    446 			goto number;
    447 		case 'u':
    448 			base = 10;
    449 			goto uns_number;
    450 		case 'o':
    451 			base = 8;
    452 			goto uns_number;
    453 		case 'x':
    454 			/* we don't implement 'x'; treat like 'X' */
    455 		case 'X':
    456 			base = 16;
    457 uns_number:	  /* an unsigned number */
    458 			sign = 0;
    459 #ifdef BSD4_4
    460 			if (isquad)
    461 				num = va_arg(ap, u_quad_t);
    462 			else
    463 #endif
    464 			if (islong)
    465 				num = va_arg(ap, unsigned long);
    466 			else
    467 				num = va_arg(ap, unsigned int);
    468 number:		  /* process a number */
    469 			p = temp + TEMPSIZE - 1;
    470 			*p = '\0';
    471 			while (num) {
    472 				*--p = digit[num % base];
    473 				num /= base;
    474 			}
    475 			len = (temp + TEMPSIZE - 1) - p;
    476 			if (prec < 0)
    477 				prec = 1;
    478 			if (sharp && *f == 'o' && prec <= len)
    479 				prec = len + 1;
    480 			pad = 0;
    481 			if (width) {
    482 				size = len;
    483 				if (size < prec)
    484 					size = prec;
    485 				size += sign;
    486 				pad = width - size;
    487 				if (flushleft == 0) {
    488 					while (--pad >= 0)
    489 						outc(' ', dest);
    490 				}
    491 			}
    492 			if (sign)
    493 				outc('-', dest);
    494 			prec -= len;
    495 			while (--prec >= 0)
    496 				outc('0', dest);
    497 			while (*p)
    498 				outc(*p++, dest);
    499 			while (--pad >= 0)
    500 				outc(' ', dest);
    501 			break;
    502 		case 's':
    503 			p = va_arg(ap, char *);
    504 			pad = 0;
    505 			if (width) {
    506 				len = strlen(p);
    507 				if (prec >= 0 && len > prec)
    508 					len = prec;
    509 				pad = width - len;
    510 				if (flushleft == 0) {
    511 					while (--pad >= 0)
    512 						outc(' ', dest);
    513 				}
    514 			}
    515 			prec++;
    516 			while (--prec != 0 && *p)
    517 				outc(*p++, dest);
    518 			while (--pad >= 0)
    519 				outc(' ', dest);
    520 			break;
    521 		case 'c':
    522 			c = va_arg(ap, int);
    523 			outc(c, dest);
    524 			break;
    525 		default:
    526 			outc(*f, dest);
    527 			break;
    528 		}
    529 		f++;
    530 	}
    531 }
    532 
    533 
    534 
    535 /*
    536  * Version of write which resumes after a signal is caught.
    537  */
    538 
    539 int
    540 xwrite(fd, buf, nbytes)
    541 	int fd;
    542 	char *buf;
    543 	int nbytes;
    544 	{
    545 	int ntry;
    546 	int i;
    547 	int n;
    548 
    549 	n = nbytes;
    550 	ntry = 0;
    551 	for (;;) {
    552 		i = write(fd, buf, n);
    553 		if (i > 0) {
    554 			if ((n -= i) <= 0)
    555 				return nbytes;
    556 			buf += i;
    557 			ntry = 0;
    558 		} else if (i == 0) {
    559 			if (++ntry > 10)
    560 				return nbytes - n;
    561 		} else if (errno != EINTR) {
    562 			return -1;
    563 		}
    564 	}
    565 }
    566 
    567 
    568 /*
    569  * Version of ioctl that retries after a signal is caught.
    570  * XXX unused function
    571  */
    572 
    573 int
    574 xioctl(fd, request, arg)
    575 	int fd;
    576 	unsigned long request;
    577 	char * arg;
    578 {
    579 	int i;
    580 
    581 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    582 	return i;
    583 }
    584