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output.c revision 1.34 
      1 /*	$NetBSD: output.c,v 1.34 2016/02/28 23:12:23 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)output.c	8.2 (Berkeley) 5/4/95";
     39 #else
     40 __RCSID("$NetBSD: output.c,v 1.34 2016/02/28 23:12:23 christos Exp $");
     41 #endif
     42 #endif /* not lint */
     43 
     44 /*
     45  * Shell output routines.  We use our own output routines because:
     46  *	When a builtin command is interrupted we have to discard
     47  *		any pending output.
     48  *	When a builtin command appears in back quotes, we want to
     49  *		save the output of the command in a region obtained
     50  *		via malloc, rather than doing a fork and reading the
     51  *		output of the command via a pipe.
     52  *	Our output routines may be smaller than the stdio routines.
     53  */
     54 
     55 #include <sys/types.h>		/* quad_t */
     56 #include <sys/param.h>		/* BSD4_4 */
     57 #include <sys/ioctl.h>
     58 
     59 #include <stdio.h>	/* defines BUFSIZ */
     60 #include <string.h>
     61 #include <errno.h>
     62 #include <unistd.h>
     63 #include <stdlib.h>
     64 
     65 #include "shell.h"
     66 #include "syntax.h"
     67 #include "output.h"
     68 #include "memalloc.h"
     69 #include "error.h"
     70 
     71 
     72 #define OUTBUFSIZ BUFSIZ
     73 #define BLOCK_OUT -2		/* output to a fixed block of memory */
     74 #define MEM_OUT -3		/* output to dynamically allocated memory */
     75 
     76 
     77 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
     78 struct output errout = {NULL, 0, NULL, 100, 2, 0};
     79 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
     80 struct output *out1 = &output;
     81 struct output *out2 = &errout;
     82 
     83 
     84 
     85 #ifdef mkinit
     86 
     87 INCLUDE "output.h"
     88 INCLUDE "memalloc.h"
     89 
     90 RESET {
     91 	out1 = &output;
     92 	out2 = &errout;
     93 	if (memout.buf != NULL) {
     94 		ckfree(memout.buf);
     95 		memout.buf = NULL;
     96 	}
     97 }
     98 
     99 #endif
    100 
    101 
    102 #ifdef notdef	/* no longer used */
    103 /*
    104  * Set up an output file to write to memory rather than a file.
    105  */
    106 
    107 void
    108 open_mem(char *block, int length, struct output *file)
    109 {
    110 	file->nextc = block;
    111 	file->nleft = --length;
    112 	file->fd = BLOCK_OUT;
    113 	file->flags = 0;
    114 }
    115 #endif
    116 
    117 
    118 void
    119 out1str(const char *p)
    120 {
    121 	outstr(p, out1);
    122 }
    123 
    124 
    125 void
    126 out2str(const char *p)
    127 {
    128 	outstr(p, out2);
    129 }
    130 
    131 
    132 void
    133 outstr(const char *p, struct output *file)
    134 {
    135 	while (*p)
    136 		outc(*p++, file);
    137 	if (file == out2)
    138 		flushout(file);
    139 }
    140 
    141 
    142 void
    143 out2shstr(const char *p)
    144 {
    145 	outshstr(p, out2);
    146 }
    147 
    148 
    149 void
    150 outshstr(const char *p, struct output *file)
    151 {
    152 	static const char norm_chars [] \
    153 		= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/-=";
    154 	int need_q = p[0] == 0 || p[strspn(p, norm_chars)] != 0;
    155 	char c;
    156 
    157 	if (need_q)
    158 		outc('\'', file);
    159 
    160 	while (c = *p++, c != 0){
    161 		if (c != '\''){
    162 			outc(c, file);
    163 		}else{
    164 			outc('\'', file);
    165 			outc('\\', file);
    166 			outc(c, file);
    167 			outc('\'', file);
    168 		}
    169 	}
    170 
    171 	if (need_q)
    172 		outc('\'', file);
    173 
    174 	if (file == out2)
    175 		flushout(file);
    176 }
    177 
    178 
    179 char out_junk[16];
    180 
    181 
    182 void
    183 emptyoutbuf(struct output *dest)
    184 {
    185 	int offset;
    186 
    187 	if (dest->fd == BLOCK_OUT) {
    188 		dest->nextc = out_junk;
    189 		dest->nleft = sizeof out_junk;
    190 		dest->flags |= OUTPUT_ERR;
    191 	} else if (dest->buf == NULL) {
    192 		INTOFF;
    193 		dest->buf = ckmalloc(dest->bufsize);
    194 		dest->nextc = dest->buf;
    195 		dest->nleft = dest->bufsize;
    196 		INTON;
    197 	} else if (dest->fd == MEM_OUT) {
    198 		offset = dest->bufsize;
    199 		INTOFF;
    200 		dest->bufsize <<= 1;
    201 		dest->buf = ckrealloc(dest->buf, dest->bufsize);
    202 		dest->nleft = dest->bufsize - offset;
    203 		dest->nextc = dest->buf + offset;
    204 		INTON;
    205 	} else {
    206 		flushout(dest);
    207 	}
    208 	dest->nleft--;
    209 }
    210 
    211 
    212 void
    213 flushall(void)
    214 {
    215 	flushout(&output);
    216 	flushout(&errout);
    217 }
    218 
    219 
    220 void
    221 flushout(struct output *dest)
    222 {
    223 
    224 	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
    225 		return;
    226 	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
    227 		dest->flags |= OUTPUT_ERR;
    228 	dest->nextc = dest->buf;
    229 	dest->nleft = dest->bufsize;
    230 }
    231 
    232 
    233 void
    234 freestdout(void)
    235 {
    236 	INTOFF;
    237 	if (output.buf) {
    238 		ckfree(output.buf);
    239 		output.buf = NULL;
    240 		output.nleft = 0;
    241 	}
    242 	INTON;
    243 }
    244 
    245 
    246 void
    247 outfmt(struct output *file, const char *fmt, ...)
    248 {
    249 	va_list ap;
    250 
    251 	va_start(ap, fmt);
    252 	doformat(file, fmt, ap);
    253 	va_end(ap);
    254 }
    255 
    256 
    257 void
    258 out1fmt(const char *fmt, ...)
    259 {
    260 	va_list ap;
    261 
    262 	va_start(ap, fmt);
    263 	doformat(out1, fmt, ap);
    264 	va_end(ap);
    265 }
    266 
    267 #ifdef DEBUG
    268 void
    269 debugprintf(const char *fmt, ...)
    270 {
    271 	va_list ap;
    272 
    273 	va_start(ap, fmt);
    274 	doformat(out2, fmt, ap);
    275 	va_end(ap);
    276 	flushout(out2);
    277 }
    278 #endif
    279 
    280 void
    281 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
    282 {
    283 	va_list ap;
    284 	struct output strout;
    285 
    286 	va_start(ap, fmt);
    287 	strout.nextc = outbuf;
    288 	strout.nleft = length;
    289 	strout.fd = BLOCK_OUT;
    290 	strout.flags = 0;
    291 	doformat(&strout, fmt, ap);
    292 	outc('\0', &strout);
    293 	if (strout.flags & OUTPUT_ERR)
    294 		outbuf[length - 1] = '\0';
    295 	va_end(ap);
    296 }
    297 
    298 /*
    299  * Formatted output.  This routine handles a subset of the printf formats:
    300  * - Formats supported: d, u, o, p, X, s, and c.
    301  * - The x format is also accepted but is treated like X.
    302  * - The l, ll and q modifiers are accepted.
    303  * - The - and # flags are accepted; # only works with the o format.
    304  * - Width and precision may be specified with any format except c.
    305  * - An * may be given for the width or precision.
    306  * - The obsolete practice of preceding the width with a zero to get
    307  *   zero padding is not supported; use the precision field.
    308  * - A % may be printed by writing %% in the format string.
    309  */
    310 
    311 #define TEMPSIZE 24
    312 
    313 #ifdef BSD4_4
    314 #define HAVE_VASPRINTF 1
    315 #endif
    316 
    317 void
    318 doformat(struct output *dest, const char *f, va_list ap)
    319 {
    320 #if	HAVE_VASPRINTF
    321 	char *s;
    322 
    323 	vasprintf(&s, f, ap);
    324 	if (s == NULL)
    325 		error("Could not allocate formatted output buffer");
    326 	outstr(s, dest);
    327 	free(s);
    328 #else	/* !HAVE_VASPRINTF */
    329 	static const char digit[] = "0123456789ABCDEF";
    330 	char c;
    331 	char temp[TEMPSIZE];
    332 	int flushleft;
    333 	int sharp;
    334 	int width;
    335 	int prec;
    336 	int islong;
    337 	int isquad;
    338 	char *p;
    339 	int sign;
    340 #ifdef BSD4_4
    341 	quad_t l;
    342 	u_quad_t num;
    343 #else
    344 	long l;
    345 	u_long num;
    346 #endif
    347 	unsigned base;
    348 	int len;
    349 	int size;
    350 	int pad;
    351 
    352 	while ((c = *f++) != '\0') {
    353 		if (c != '%') {
    354 			outc(c, dest);
    355 			continue;
    356 		}
    357 		flushleft = 0;
    358 		sharp = 0;
    359 		width = 0;
    360 		prec = -1;
    361 		islong = 0;
    362 		isquad = 0;
    363 		for (;;) {
    364 			if (*f == '-')
    365 				flushleft++;
    366 			else if (*f == '#')
    367 				sharp++;
    368 			else
    369 				break;
    370 			f++;
    371 		}
    372 		if (*f == '*') {
    373 			width = va_arg(ap, int);
    374 			f++;
    375 		} else {
    376 			while (is_digit(*f)) {
    377 				width = 10 * width + digit_val(*f++);
    378 			}
    379 		}
    380 		if (*f == '.') {
    381 			if (*++f == '*') {
    382 				prec = va_arg(ap, int);
    383 				f++;
    384 			} else {
    385 				prec = 0;
    386 				while (is_digit(*f)) {
    387 					prec = 10 * prec + digit_val(*f++);
    388 				}
    389 			}
    390 		}
    391 		if (*f == 'l') {
    392 			f++;
    393 			if (*f == 'l') {
    394 				isquad++;
    395 				f++;
    396 			} else
    397 				islong++;
    398 		} else if (*f == 'q') {
    399 			isquad++;
    400 			f++;
    401 		}
    402 		switch (*f) {
    403 		case 'd':
    404 #ifdef BSD4_4
    405 			if (isquad)
    406 				l = va_arg(ap, quad_t);
    407 			else
    408 #endif
    409 			if (islong)
    410 				l = va_arg(ap, long);
    411 			else
    412 				l = va_arg(ap, int);
    413 			sign = 0;
    414 			num = l;
    415 			if (l < 0) {
    416 				num = -l;
    417 				sign = 1;
    418 			}
    419 			base = 10;
    420 			goto number;
    421 		case 'u':
    422 			base = 10;
    423 			goto uns_number;
    424 		case 'o':
    425 			base = 8;
    426 			goto uns_number;
    427 		case 'p':
    428 			outc('0', dest);
    429 			outc('x', dest);
    430 			/*FALLTHROUGH*/
    431 		case 'x':
    432 			/* we don't implement 'x'; treat like 'X' */
    433 		case 'X':
    434 			base = 16;
    435 uns_number:	  /* an unsigned number */
    436 			sign = 0;
    437 #ifdef BSD4_4
    438 			if (isquad)
    439 				num = va_arg(ap, u_quad_t);
    440 			else
    441 #endif
    442 			if (islong)
    443 				num = va_arg(ap, unsigned long);
    444 			else
    445 				num = va_arg(ap, unsigned int);
    446 number:		  /* process a number */
    447 			p = temp + TEMPSIZE - 1;
    448 			*p = '\0';
    449 			while (num) {
    450 				*--p = digit[num % base];
    451 				num /= base;
    452 			}
    453 			len = (temp + TEMPSIZE - 1) - p;
    454 			if (prec < 0)
    455 				prec = 1;
    456 			if (sharp && *f == 'o' && prec <= len)
    457 				prec = len + 1;
    458 			pad = 0;
    459 			if (width) {
    460 				size = len;
    461 				if (size < prec)
    462 					size = prec;
    463 				size += sign;
    464 				pad = width - size;
    465 				if (flushleft == 0) {
    466 					while (--pad >= 0)
    467 						outc(' ', dest);
    468 				}
    469 			}
    470 			if (sign)
    471 				outc('-', dest);
    472 			prec -= len;
    473 			while (--prec >= 0)
    474 				outc('0', dest);
    475 			while (*p)
    476 				outc(*p++, dest);
    477 			while (--pad >= 0)
    478 				outc(' ', dest);
    479 			break;
    480 		case 's':
    481 			p = va_arg(ap, char *);
    482 			pad = 0;
    483 			if (width) {
    484 				len = strlen(p);
    485 				if (prec >= 0 && len > prec)
    486 					len = prec;
    487 				pad = width - len;
    488 				if (flushleft == 0) {
    489 					while (--pad >= 0)
    490 						outc(' ', dest);
    491 				}
    492 			}
    493 			prec++;
    494 			while (--prec != 0 && *p)
    495 				outc(*p++, dest);
    496 			while (--pad >= 0)
    497 				outc(' ', dest);
    498 			break;
    499 		case 'c':
    500 			c = va_arg(ap, int);
    501 			outc(c, dest);
    502 			break;
    503 		default:
    504 			outc(*f, dest);
    505 			break;
    506 		}
    507 		f++;
    508 	}
    509 #endif	/* !HAVE_VASPRINTF */
    510 }
    511 
    512 
    513 
    514 /*
    515  * Version of write which resumes after a signal is caught.
    516  */
    517 
    518 int
    519 xwrite(int fd, char *buf, int nbytes)
    520 {
    521 	int ntry;
    522 	int i;
    523 	int n;
    524 
    525 	n = nbytes;
    526 	ntry = 0;
    527 	while (n > 0) {
    528 		i = write(fd, buf, n);
    529 		if (i > 0) {
    530 			if ((n -= i) <= 0)
    531 				return nbytes;
    532 			buf += i;
    533 			ntry = 0;
    534 		} else if (i == 0) {
    535 			if (++ntry > 10)
    536 				return nbytes - n;
    537 		} else if (errno != EINTR) {
    538 			return -1;
    539 		}
    540 	}
    541 	return nbytes;
    542 }
    543 
    544 
    545 /*
    546  * Version of ioctl that retries after a signal is caught.
    547  * XXX unused function
    548  */
    549 
    550 int
    551 xioctl(int fd, unsigned long request, char *arg)
    552 {
    553 	int i;
    554 
    555 	while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
    556 	return i;
    557 }
    558