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output.c revision 1.16 
      1 /*	$NetBSD: output.c,v 1.16 1996/10/16 14:51:24 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 1.16 1996/10/16 14:51:24 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 #ifdef __STDC__
     64 #include <stdarg.h>
     65 #else
     66 #include <varargs.h>
     67 #endif
     68 #include <errno.h>
     69 #include <unistd.h>
     70 #include <stdlib.h>
     71 
     72 #include "shell.h"
     73 #include "syntax.h"
     74 #include "output.h"
     75 #include "memalloc.h"
     76 #include "error.h"
     77 
     78 
     79 #define OUTBUFSIZ BUFSIZ
     80 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     81 #define MEM_OUT -3		/* output to dynamically allocated memory */
     82 #define OUTPUT_ERR 01		/* error occurred on output */
     83 
     84 
     85 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     86 struct output errout = {NULL, 0, NULL, 100, 2, 0};;
     87 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     88 struct output *out1 = &output;
     89 struct output *out2 = &errout;
     90 
     91 
     92 
     93 #ifdef mkinit
     94 
     95 INCLUDE "output.h"
     96 INCLUDE "memalloc.h"
     97 
     98 RESET {
     99 	out1 = &output;
    100 	out2 = &errout;
    101 	if (memout.buf != NULL) {
    102 		ckfree(memout.buf);
    103 		memout.buf = NULL;
    104 	}
    105 }
    106 
    107 #endif
    108 
    109 
    110 #ifdef notdef	/* no longer used */
    111 /*
    112  * Set up an output file to write to memory rather than a file.
    113  */
    114 
    115 void
    116 open_mem(block, length, file)
    117 	char *block;
    118 	int length;
    119 	struct output *file;
    120 	{
    121 	file->nextc = block;
    122 	file->nleft = --length;
    123 	file->fd = BLOCK_OUT;
    124 	file->flags = 0;
    125 }
    126 #endif
    127 
    128 
    129 void
    130 out1str(p)
    131 	const char *p;
    132 	{
    133 	outstr(p, out1);
    134 }
    135 
    136 
    137 void
    138 out2str(p)
    139 	const char *p;
    140 	{
    141 	outstr(p, out2);
    142 }
    143 
    144 
    145 void
    146 outstr(p, file)
    147 	register const char *p;
    148 	register struct output *file;
    149 	{
    150 	while (*p)
    151 		outc(*p++, file);
    152 	if (file == out2)
    153 		flushout(file);
    154 }
    155 
    156 
    157 char out_junk[16];
    158 
    159 
    160 void
    161 emptyoutbuf(dest)
    162 	struct output *dest;
    163 	{
    164 	int offset;
    165 
    166 	if (dest->fd == BLOCK_OUT) {
    167 		dest->nextc = out_junk;
    168 		dest->nleft = sizeof out_junk;
    169 		dest->flags |= OUTPUT_ERR;
    170 	} else if (dest->buf == NULL) {
    171 		INTOFF;
    172 		dest->buf = ckmalloc(dest->bufsize);
    173 		dest->nextc = dest->buf;
    174 		dest->nleft = dest->bufsize;
    175 		INTON;
    176 	} else if (dest->fd == MEM_OUT) {
    177 		offset = dest->bufsize;
    178 		INTOFF;
    179 		dest->bufsize <<= 1;
    180 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    181 		dest->nleft = dest->bufsize - offset;
    182 		dest->nextc = dest->buf + offset;
    183 		INTON;
    184 	} else {
    185 		flushout(dest);
    186 	}
    187 	dest->nleft--;
    188 }
    189 
    190 
    191 void
    192 flushall() {
    193 	flushout(&output);
    194 	flushout(&errout);
    195 }
    196 
    197 
    198 void
    199 flushout(dest)
    200 	struct output *dest;
    201 	{
    202 
    203 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    204 		return;
    205 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    206 		dest->flags |= OUTPUT_ERR;
    207 	dest->nextc = dest->buf;
    208 	dest->nleft = dest->bufsize;
    209 }
    210 
    211 
    212 void
    213 freestdout() {
    214 	INTOFF;
    215 	if (output.buf) {
    216 		ckfree(output.buf);
    217 		output.buf = NULL;
    218 		output.nleft = 0;
    219 	}
    220 	INTON;
    221 }
    222 
    223 
    224 #ifdef __STDC__
    225 void
    226 outfmt(struct output *file, char *fmt, ...) {
    227 	va_list ap;
    228 
    229 	va_start(ap, fmt);
    230 	doformat(file, fmt, ap);
    231 	va_end(ap);
    232 }
    233 
    234 
    235 void
    236 out1fmt(char *fmt, ...) {
    237 	va_list ap;
    238 
    239 	va_start(ap, fmt);
    240 	doformat(out1, fmt, ap);
    241 	va_end(ap);
    242 }
    243 
    244 void
    245 dprintf(char *fmt, ...) {
    246 	va_list ap;
    247 
    248 	va_start(ap, fmt);
    249 	doformat(out2, fmt, ap);
    250 	va_end(ap);
    251 	flushout(out2);
    252 }
    253 
    254 void
    255 fmtstr(char *outbuf, int length, char *fmt, ...) {
    256 	va_list ap;
    257 	struct output strout;
    258 
    259 	va_start(ap, fmt);
    260 	strout.nextc = outbuf;
    261 	strout.nleft = length;
    262 	strout.fd = BLOCK_OUT;
    263 	strout.flags = 0;
    264 	doformat(&strout, fmt, ap);
    265 	outc('\0', &strout);
    266 	if (strout.flags & OUTPUT_ERR)
    267 		outbuf[length - 1] = '\0';
    268 }
    269 
    270 #else /* not __STDC__ */
    271 
    272 void
    273 outfmt(va_alist)
    274 	va_dcl
    275 	{
    276 	va_list ap;
    277 	struct output *file;
    278 	char *fmt;
    279 
    280 	va_start(ap);
    281 	file = va_arg(ap, struct output *);
    282 	fmt = va_arg(ap, char *);
    283 	doformat(file, fmt, ap);
    284 	va_end(ap);
    285 }
    286 
    287 
    288 void
    289 out1fmt(va_alist)
    290 	va_dcl
    291 	{
    292 	va_list ap;
    293 	char *fmt;
    294 
    295 	va_start(ap);
    296 	fmt = va_arg(ap, char *);
    297 	doformat(out1, fmt, ap);
    298 	va_end(ap);
    299 }
    300 
    301 void
    302 dprintf(va_alist)
    303 	va_dcl
    304 	{
    305 	va_list ap;
    306 	char *fmt;
    307 
    308 	va_start(ap);
    309 	fmt = va_arg(ap, char *);
    310 	doformat(out2, fmt, ap);
    311 	va_end(ap);
    312 	flushout(out2);
    313 }
    314 
    315 void
    316 fmtstr(va_alist)
    317 	va_dcl
    318 	{
    319 	va_list ap;
    320 	struct output strout;
    321 	char *outbuf;
    322 	int length;
    323 	char *fmt;
    324 
    325 	va_start(ap);
    326 	outbuf = va_arg(ap, char *);
    327 	length = va_arg(ap, int);
    328 	fmt = va_arg(ap, char *);
    329 	strout.nextc = outbuf;
    330 	strout.nleft = length;
    331 	strout.fd = BLOCK_OUT;
    332 	strout.flags = 0;
    333 	doformat(&strout, fmt, ap);
    334 	outc('\0', &strout);
    335 	if (strout.flags & OUTPUT_ERR)
    336 		outbuf[length - 1] = '\0';
    337 }
    338 #endif /* __STDC__ */
    339 
    340 
    341 /*
    342  * Formatted output.  This routine handles a subset of the printf formats:
    343  * - Formats supported: d, u, o, X, s, and c.
    344  * - The x format is also accepted but is treated like X.
    345  * - The l and q modifiers are accepted.
    346  * - The - and # flags are accepted; # only works with the o format.
    347  * - Width and precision may be specified with any format except c.
    348  * - An * may be given for the width or precision.
    349  * - The obsolete practice of preceding the width with a zero to get
    350  *   zero padding is not supported; use the precision field.
    351  * - A % may be printed by writing %% in the format string.
    352  */
    353 
    354 #define TEMPSIZE 24
    355 
    356 static const char digit[] = "0123456789ABCDEF";
    357 
    358 
    359 void
    360 doformat(dest, f, ap)
    361 	register struct output *dest;
    362 	register char *f;		/* format string */
    363 	va_list ap;
    364 	{
    365 	register char c;
    366 	char temp[TEMPSIZE];
    367 	int flushleft;
    368 	int sharp;
    369 	int width;
    370 	int prec;
    371 	int islong;
    372 	int isquad;
    373 	char *p;
    374 	int sign;
    375 	quad_t l;
    376 	u_quad_t num;
    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 			if (isquad)
    431 				l = va_arg(ap, quad_t);
    432 			else if (islong)
    433 				l = va_arg(ap, long);
    434 			else
    435 				l = va_arg(ap, int);
    436 			sign = 0;
    437 			num = l;
    438 			if (l < 0) {
    439 				num = -l;
    440 				sign = 1;
    441 			}
    442 			base = 10;
    443 			goto number;
    444 		case 'u':
    445 			base = 10;
    446 			goto uns_number;
    447 		case 'o':
    448 			base = 8;
    449 			goto uns_number;
    450 		case 'x':
    451 			/* we don't implement 'x'; treat like 'X' */
    452 		case 'X':
    453 			base = 16;
    454 uns_number:	  /* an unsigned number */
    455 			sign = 0;
    456 			if (isquad)
    457 				num = va_arg(ap, u_quad_t);
    458 			else if (islong)
    459 				num = va_arg(ap, unsigned long);
    460 			else
    461 				num = va_arg(ap, unsigned int);
    462 number:		  /* process a number */
    463 			p = temp + TEMPSIZE - 1;
    464 			*p = '\0';
    465 			while (num) {
    466 				*--p = digit[num % base];
    467 				num /= base;
    468 			}
    469 			len = (temp + TEMPSIZE - 1) - p;
    470 			if (prec < 0)
    471 				prec = 1;
    472 			if (sharp && *f == 'o' && prec <= len)
    473 				prec = len + 1;
    474 			pad = 0;
    475 			if (width) {
    476 				size = len;
    477 				if (size < prec)
    478 					size = prec;
    479 				size += sign;
    480 				pad = width - size;
    481 				if (flushleft == 0) {
    482 					while (--pad >= 0)
    483 						outc(' ', dest);
    484 				}
    485 			}
    486 			if (sign)
    487 				outc('-', dest);
    488 			prec -= len;
    489 			while (--prec >= 0)
    490 				outc('0', dest);
    491 			while (*p)
    492 				outc(*p++, dest);
    493 			while (--pad >= 0)
    494 				outc(' ', dest);
    495 			break;
    496 		case 's':
    497 			p = va_arg(ap, char *);
    498 			pad = 0;
    499 			if (width) {
    500 				len = strlen(p);
    501 				if (prec >= 0 && len > prec)
    502 					len = prec;
    503 				pad = width - len;
    504 				if (flushleft == 0) {
    505 					while (--pad >= 0)
    506 						outc(' ', dest);
    507 				}
    508 			}
    509 			prec++;
    510 			while (--prec != 0 && *p)
    511 				outc(*p++, dest);
    512 			while (--pad >= 0)
    513 				outc(' ', dest);
    514 			break;
    515 		case 'c':
    516 			c = va_arg(ap, int);
    517 			outc(c, dest);
    518 			break;
    519 		default:
    520 			outc(*f, dest);
    521 			break;
    522 		}
    523 		f++;
    524 	}
    525 }
    526 
    527 
    528 
    529 /*
    530  * Version of write which resumes after a signal is caught.
    531  */
    532 
    533 int
    534 xwrite(fd, buf, nbytes)
    535 	int fd;
    536 	char *buf;
    537 	int nbytes;
    538 	{
    539 	int ntry;
    540 	int i;
    541 	int n;
    542 
    543 	n = nbytes;
    544 	ntry = 0;
    545 	for (;;) {
    546 		i = write(fd, buf, n);
    547 		if (i > 0) {
    548 			if ((n -= i) <= 0)
    549 				return nbytes;
    550 			buf += i;
    551 			ntry = 0;
    552 		} else if (i == 0) {
    553 			if (++ntry > 10)
    554 				return nbytes - n;
    555 		} else if (errno != EINTR) {
    556 			return -1;
    557 		}
    558 	}
    559 }
    560 
    561 
    562 /*
    563  * Version of ioctl that retries after a signal is caught.
    564  * XXX unused function
    565  */
    566 
    567 int
    568 xioctl(fd, request, arg)
    569 	int fd;
    570 	unsigned long request;
    571 	char * arg;
    572 {
    573 	int i;
    574 
    575 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    576 	return i;
    577 }
    578