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output.c revision 1.1.1.1 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Kenneth Almquist.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 static char sccsid[] = "@(#)output.c	5.1 (Berkeley) 3/7/91";
     39 #endif /* not lint */
     40 
     41 /*
     42  * Shell output routines.  We use our own output routines because:
     43  *	When a builtin command is interrupted we have to discard
     44  *		any pending output.
     45  *	When a builtin command appears in back quotes, we want to
     46  *		save the output of the command in a region obtained
     47  *		via malloc, rather than doing a fork and reading the
     48  *		output of the command via a pipe.
     49  *	Our output routines may be smaller than the stdio routines.
     50  */
     51 
     52 #include <stdio.h>	/* defines BUFSIZ */
     53 #include "shell.h"
     54 #include "syntax.h"
     55 #include "output.h"
     56 #include "memalloc.h"
     57 #include "error.h"
     58 #ifdef __STDC__
     59 #include "stdarg.h"
     60 #else
     61 #include <varargs.h>
     62 #endif
     63 #include <errno.h>
     64 
     65 
     66 #define OUTBUFSIZ BUFSIZ
     67 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     68 #define MEM_OUT -3		/* output to dynamically allocated memory */
     69 #define OUTPUT_ERR 01		/* error occurred on output */
     70 
     71 
     72 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     73 struct output errout = {NULL, 0, NULL, 100, 2, 0};;
     74 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     75 struct output *out1 = &output;
     76 struct output *out2 = &errout;
     77 
     78 
     79 
     80 #ifdef mkinit
     81 
     82 INCLUDE "output.h"
     83 INCLUDE "memalloc.h"
     84 
     85 RESET {
     86 	out1 = &output;
     87 	out2 = &errout;
     88 	if (memout.buf != NULL) {
     89 		ckfree(memout.buf);
     90 		memout.buf = NULL;
     91 	}
     92 }
     93 
     94 #endif
     95 
     96 
     97 #ifdef notdef	/* no longer used */
     98 /*
     99  * Set up an output file to write to memory rather than a file.
    100  */
    101 
    102 void
    103 open_mem(block, length, file)
    104 	char *block;
    105 	int length;
    106 	struct output *file;
    107 	{
    108 	file->nextc = block;
    109 	file->nleft = --length;
    110 	file->fd = BLOCK_OUT;
    111 	file->flags = 0;
    112 }
    113 #endif
    114 
    115 
    116 void
    117 out1str(p)
    118 	char *p;
    119 	{
    120 	outstr(p, out1);
    121 }
    122 
    123 
    124 void
    125 out2str(p)
    126 	char *p;
    127 	{
    128 	outstr(p, out2);
    129 }
    130 
    131 
    132 void
    133 outstr(p, file)
    134 	register char *p;
    135 	register struct output *file;
    136 	{
    137 	while (*p)
    138 		outc(*p++, file);
    139 }
    140 
    141 
    142 char out_junk[16];
    143 
    144 
    145 void
    146 emptyoutbuf(dest)
    147 	struct output *dest;
    148 	{
    149 	int offset;
    150 
    151 	if (dest->fd == BLOCK_OUT) {
    152 		dest->nextc = out_junk;
    153 		dest->nleft = sizeof out_junk;
    154 		dest->flags |= OUTPUT_ERR;
    155 	} else if (dest->buf == NULL) {
    156 		INTOFF;
    157 		dest->buf = ckmalloc(dest->bufsize);
    158 		dest->nextc = dest->buf;
    159 		dest->nleft = dest->bufsize;
    160 		INTON;
    161 	} else if (dest->fd == MEM_OUT) {
    162 		offset = dest->bufsize;
    163 		INTOFF;
    164 		dest->bufsize <<= 1;
    165 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    166 		dest->nleft = dest->bufsize - offset;
    167 		dest->nextc = dest->buf + offset;
    168 		INTON;
    169 	} else {
    170 		flushout(dest);
    171 	}
    172 	dest->nleft--;
    173 }
    174 
    175 
    176 void
    177 flushall() {
    178 	flushout(&output);
    179 	flushout(&errout);
    180 }
    181 
    182 
    183 void
    184 flushout(dest)
    185 	struct output *dest;
    186 	{
    187 
    188 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    189 		return;
    190 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    191 		dest->flags |= OUTPUT_ERR;
    192 	dest->nextc = dest->buf;
    193 	dest->nleft = dest->bufsize;
    194 }
    195 
    196 
    197 void
    198 freestdout() {
    199 	INTOFF;
    200 	if (output.buf) {
    201 		ckfree(output.buf);
    202 		output.buf = NULL;
    203 		output.nleft = 0;
    204 	}
    205 	INTON;
    206 }
    207 
    208 
    209 #ifdef __STDC__
    210 void
    211 outfmt(struct output *file, char *fmt, ...) {
    212 	va_list ap;
    213 
    214 	va_start(ap, fmt);
    215 	doformat(file, fmt, ap);
    216 	va_end(ap);
    217 }
    218 
    219 
    220 void
    221 out1fmt(char *fmt, ...) {
    222 	va_list ap;
    223 
    224 	va_start(ap, fmt);
    225 	doformat(out1, fmt, ap);
    226 	va_end(ap);
    227 }
    228 
    229 
    230 void
    231 fmtstr(char *outbuf, int length, char *fmt, ...) {
    232 	va_list ap;
    233 	struct output strout;
    234 
    235 	va_start(ap, fmt);
    236 	strout.nextc = outbuf;
    237 	strout.nleft = length;
    238 	strout.fd = BLOCK_OUT;
    239 	strout.flags = 0;
    240 	doformat(&strout, fmt, ap);
    241 	outc('\0', &strout);
    242 	if (strout.flags & OUTPUT_ERR)
    243 		outbuf[length - 1] = '\0';
    244 }
    245 
    246 #else /* not __STDC__ */
    247 
    248 void
    249 outfmt(va_alist)
    250 	va_dcl
    251 	{
    252 	va_list ap;
    253 	struct output *file;
    254 	char *fmt;
    255 
    256 	va_start(ap);
    257 	file = va_arg(ap, struct output *);
    258 	fmt = va_arg(ap, char *);
    259 	doformat(file, fmt, ap);
    260 	va_end(ap);
    261 }
    262 
    263 
    264 void
    265 out1fmt(va_alist)
    266 	va_dcl
    267 	{
    268 	va_list ap;
    269 	char *fmt;
    270 
    271 	va_start(ap);
    272 	fmt = va_arg(ap, char *);
    273 	doformat(out1, fmt, ap);
    274 	va_end(ap);
    275 }
    276 
    277 
    278 void
    279 fmtstr(va_alist)
    280 	va_dcl
    281 	{
    282 	va_list ap;
    283 	struct output strout;
    284 	char *outbuf;
    285 	int length;
    286 	char *fmt;
    287 
    288 	va_start(ap);
    289 	outbuf = va_arg(ap, char *);
    290 	length = va_arg(ap, int);
    291 	fmt = va_arg(ap, char *);
    292 	strout.nextc = outbuf;
    293 	strout.nleft = length;
    294 	strout.fd = BLOCK_OUT;
    295 	strout.flags = 0;
    296 	doformat(&strout, fmt, ap);
    297 	outc('\0', &strout);
    298 	if (strout.flags & OUTPUT_ERR)
    299 		outbuf[length - 1] = '\0';
    300 }
    301 #endif /* __STDC__ */
    302 
    303 
    304 /*
    305  * Formatted output.  This routine handles a subset of the printf formats:
    306  * - Formats supported: d, u, o, X, s, and c.
    307  * - The x format is also accepted but is treated like X.
    308  * - The l modifier is accepted.
    309  * - The - and # flags are accepted; # only works with the o format.
    310  * - Width and precision may be specified with any format except c.
    311  * - An * may be given for the width or precision.
    312  * - The obsolete practice of preceding the width with a zero to get
    313  *   zero padding is not supported; use the precision field.
    314  * - A % may be printed by writing %% in the format string.
    315  */
    316 
    317 #define TEMPSIZE 24
    318 
    319 #ifdef __STDC__
    320 static const char digit[16] = "0123456789ABCDEF";
    321 #else
    322 static const char digit[17] = "0123456789ABCDEF";
    323 #endif
    324 
    325 
    326 void
    327 doformat(dest, f, ap)
    328 	register struct output *dest;
    329 	register char *f;		/* format string */
    330 	va_list ap;
    331 	{
    332 	register char c;
    333 	char temp[TEMPSIZE];
    334 	int flushleft;
    335 	int sharp;
    336 	int width;
    337 	int prec;
    338 	int islong;
    339 	char *p;
    340 	int sign;
    341 	long l;
    342 	unsigned long num;
    343 	unsigned base;
    344 	int len;
    345 	int size;
    346 	int pad;
    347 
    348 	while ((c = *f++) != '\0') {
    349 		if (c != '%') {
    350 			outc(c, dest);
    351 			continue;
    352 		}
    353 		flushleft = 0;
    354 		sharp = 0;
    355 		width = 0;
    356 		prec = -1;
    357 		islong = 0;
    358 		for (;;) {
    359 			if (*f == '-')
    360 				flushleft++;
    361 			else if (*f == '#')
    362 				sharp++;
    363 			else
    364 				break;
    365 			f++;
    366 		}
    367 		if (*f == '*') {
    368 			width = va_arg(ap, int);
    369 			f++;
    370 		} else {
    371 			while (is_digit(*f)) {
    372 				width = 10 * width + digit_val(*f++);
    373 			}
    374 		}
    375 		if (*f == '.') {
    376 			if (*++f == '*') {
    377 				prec = va_arg(ap, int);
    378 				f++;
    379 			} else {
    380 				prec = 0;
    381 				while (is_digit(*f)) {
    382 					prec = 10 * prec + digit_val(*f++);
    383 				}
    384 			}
    385 		}
    386 		if (*f == 'l') {
    387 			islong++;
    388 			f++;
    389 		}
    390 		switch (*f) {
    391 		case 'd':
    392 			if (islong)
    393 				l = va_arg(ap, long);
    394 			else
    395 				l = va_arg(ap, int);
    396 			sign = 0;
    397 			num = l;
    398 			if (l < 0) {
    399 				num = -l;
    400 				sign = 1;
    401 			}
    402 			base = 10;
    403 			goto number;
    404 		case 'u':
    405 			base = 10;
    406 			goto uns_number;
    407 		case 'o':
    408 			base = 8;
    409 			goto uns_number;
    410 		case 'x':
    411 			/* we don't implement 'x'; treat like 'X' */
    412 		case 'X':
    413 			base = 16;
    414 uns_number:	  /* an unsigned number */
    415 			sign = 0;
    416 			if (islong)
    417 				num = va_arg(ap, unsigned long);
    418 			else
    419 				num = va_arg(ap, unsigned int);
    420 number:		  /* process a number */
    421 			p = temp + TEMPSIZE - 1;
    422 			*p = '\0';
    423 			while (num) {
    424 				*--p = digit[num % base];
    425 				num /= base;
    426 			}
    427 			len = (temp + TEMPSIZE - 1) - p;
    428 			if (prec < 0)
    429 				prec = 1;
    430 			if (sharp && *f == 'o' && prec <= len)
    431 				prec = len + 1;
    432 			pad = 0;
    433 			if (width) {
    434 				size = len;
    435 				if (size < prec)
    436 					size = prec;
    437 				size += sign;
    438 				pad = width - size;
    439 				if (flushleft == 0) {
    440 					while (--pad >= 0)
    441 						outc(' ', dest);
    442 				}
    443 			}
    444 			if (sign)
    445 				outc('-', dest);
    446 			prec -= len;
    447 			while (--prec >= 0)
    448 				outc('0', dest);
    449 			while (*p)
    450 				outc(*p++, dest);
    451 			while (--pad >= 0)
    452 				outc(' ', dest);
    453 			break;
    454 		case 's':
    455 			p = va_arg(ap, char *);
    456 			pad = 0;
    457 			if (width) {
    458 				len = strlen(p);
    459 				if (prec >= 0 && len > prec)
    460 					len = prec;
    461 				pad = width - len;
    462 				if (flushleft == 0) {
    463 					while (--pad >= 0)
    464 						outc(' ', dest);
    465 				}
    466 			}
    467 			prec++;
    468 			while (--prec != 0 && *p)
    469 				outc(*p++, dest);
    470 			while (--pad >= 0)
    471 				outc(' ', dest);
    472 			break;
    473 		case 'c':
    474 			c = va_arg(ap, int);
    475 			outc(c, dest);
    476 			break;
    477 		default:
    478 			outc(*f, dest);
    479 			break;
    480 		}
    481 		f++;
    482 	}
    483 }
    484 
    485 
    486 
    487 /*
    488  * Version of write which resumes after a signal is caught.
    489  */
    490 
    491 int
    492 xwrite(fd, buf, nbytes)
    493 	int fd;
    494 	char *buf;
    495 	int nbytes;
    496 	{
    497 	int ntry;
    498 	int i;
    499 	int n;
    500 
    501 	n = nbytes;
    502 	ntry = 0;
    503 	for (;;) {
    504 		i = write(fd, buf, n);
    505 		if (i > 0) {
    506 			if ((n -= i) <= 0)
    507 				return nbytes;
    508 			buf += i;
    509 			ntry = 0;
    510 		} else if (i == 0) {
    511 			if (++ntry > 10)
    512 				return nbytes - n;
    513 		} else if (errno != EINTR) {
    514 			return -1;
    515 		}
    516 	}
    517 }
    518 
    519 
    520 /*
    521  * Version of ioctl that retries after a signal is caught.
    522  */
    523 
    524 int
    525 xioctl(fd, request, arg) {
    526 	int i;
    527 
    528 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    529 	return i;
    530 }
    531