source: vendor/NetBSD-ash/current/output.c

Last change on this file was 2460, checked in by bird, 20 years ago

NetBSD sh 2005-07-03.
File size: 10.4 KB
RevLine 
[2460]1/* $NetBSD: output.c,v 1.28 2003/08/07 09:05:36 agc 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
38static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 5/4/95";
39#else
40__RCSID("$NetBSD: output.c,v 1.28 2003/08/07 09:05:36 agc 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#define OUTPUT_ERR 01 /* error occurred on output */
76
77
78struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
79struct output errout = {NULL, 0, NULL, 100, 2, 0};
80struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
81struct output *out1 = &output;
82struct output *out2 = &errout;
83
84
85
86#ifdef mkinit
87
88INCLUDE "output.h"
89INCLUDE "memalloc.h"
90
91RESET {
92 out1 = &output;
93 out2 = &errout;
94 if (memout.buf != NULL) {
95 ckfree(memout.buf);
96 memout.buf = NULL;
97 }
98}
99
100#endif
101
102
103#ifdef notdef /* no longer used */
104/*
105 * Set up an output file to write to memory rather than a file.
106 */
107
108void
109open_mem(char *block, int length, struct output *file)
110{
111 file->nextc = block;
112 file->nleft = --length;
113 file->fd = BLOCK_OUT;
114 file->flags = 0;
115}
116#endif
117
118
119void
120out1str(const char *p)
121{
122 outstr(p, out1);
123}
124
125
126void
127out2str(const char *p)
128{
129 outstr(p, out2);
130}
131
132
133void
134outstr(const char *p, struct output *file)
135{
136 while (*p)
137 outc(*p++, file);
138 if (file == out2)
139 flushout(file);
140}
141
142
143char out_junk[16];
144
145
146void
147emptyoutbuf(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
176void
177flushall(void)
178{
179 flushout(&output);
180 flushout(&errout);
181}
182
183
184void
185flushout(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
197void
198freestdout(void)
199{
200 INTOFF;
201 if (output.buf) {
202 ckfree(output.buf);
203 output.buf = NULL;
204 output.nleft = 0;
205 }
206 INTON;
207}
208
209
210void
211outfmt(struct output *file, const char *fmt, ...)
212{
213 va_list ap;
214
215 va_start(ap, fmt);
216 doformat(file, fmt, ap);
217 va_end(ap);
218}
219
220
221void
222out1fmt(const char *fmt, ...)
223{
224 va_list ap;
225
226 va_start(ap, fmt);
227 doformat(out1, fmt, ap);
228 va_end(ap);
229}
230
231void
232dprintf(const char *fmt, ...)
233{
234 va_list ap;
235
236 va_start(ap, fmt);
237 doformat(out2, fmt, ap);
238 va_end(ap);
239 flushout(out2);
240}
241
242void
243fmtstr(char *outbuf, size_t length, const char *fmt, ...)
244{
245 va_list ap;
246 struct output strout;
247
248 va_start(ap, fmt);
249 strout.nextc = outbuf;
250 strout.nleft = length;
251 strout.fd = BLOCK_OUT;
252 strout.flags = 0;
253 doformat(&strout, fmt, ap);
254 outc('\0', &strout);
255 if (strout.flags & OUTPUT_ERR)
256 outbuf[length - 1] = '\0';
257 va_end(ap);
258}
259
260/*
261 * Formatted output. This routine handles a subset of the printf formats:
262 * - Formats supported: d, u, o, p, X, s, and c.
263 * - The x format is also accepted but is treated like X.
264 * - The l, ll and q modifiers are accepted.
265 * - The - and # flags are accepted; # only works with the o format.
266 * - Width and precision may be specified with any format except c.
267 * - An * may be given for the width or precision.
268 * - The obsolete practice of preceding the width with a zero to get
269 * zero padding is not supported; use the precision field.
270 * - A % may be printed by writing %% in the format string.
271 */
272
273#define TEMPSIZE 24
274
275#ifdef BSD4_4
276#define HAVE_VASPRINTF 1
277#endif
278
279void
280doformat(struct output *dest, const char *f, va_list ap)
281{
282#if HAVE_VASPRINTF
283 char *s;
284
285 vasprintf(&s, f, ap);
286 outstr(s, dest);
287 free(s);
288#else /* !HAVE_VASPRINTF */
289 static const char digit[] = "0123456789ABCDEF";
290 char c;
291 char temp[TEMPSIZE];
292 int flushleft;
293 int sharp;
294 int width;
295 int prec;
296 int islong;
297 int isquad;
298 char *p;
299 int sign;
300#ifdef BSD4_4
301 quad_t l;
302 u_quad_t num;
303#else
304 long l;
305 u_long num;
306#endif
307 unsigned base;
308 int len;
309 int size;
310 int pad;
311
312 while ((c = *f++) != '\0') {
313 if (c != '%') {
314 outc(c, dest);
315 continue;
316 }
317 flushleft = 0;
318 sharp = 0;
319 width = 0;
320 prec = -1;
321 islong = 0;
322 isquad = 0;
323 for (;;) {
324 if (*f == '-')
325 flushleft++;
326 else if (*f == '#')
327 sharp++;
328 else
329 break;
330 f++;
331 }
332 if (*f == '*') {
333 width = va_arg(ap, int);
334 f++;
335 } else {
336 while (is_digit(*f)) {
337 width = 10 * width + digit_val(*f++);
338 }
339 }
340 if (*f == '.') {
341 if (*++f == '*') {
342 prec = va_arg(ap, int);
343 f++;
344 } else {
345 prec = 0;
346 while (is_digit(*f)) {
347 prec = 10 * prec + digit_val(*f++);
348 }
349 }
350 }
351 if (*f == 'l') {
352 f++;
353 if (*f == 'l') {
354 isquad++;
355 f++;
356 } else
357 islong++;
358 } else if (*f == 'q') {
359 isquad++;
360 f++;
361 }
362 switch (*f) {
363 case 'd':
364#ifdef BSD4_4
365 if (isquad)
366 l = va_arg(ap, quad_t);
367 else
368#endif
369 if (islong)
370 l = va_arg(ap, long);
371 else
372 l = va_arg(ap, int);
373 sign = 0;
374 num = l;
375 if (l < 0) {
376 num = -l;
377 sign = 1;
378 }
379 base = 10;
380 goto number;
381 case 'u':
382 base = 10;
383 goto uns_number;
384 case 'o':
385 base = 8;
386 goto uns_number;
387 case 'p':
388 outc('0', dest);
389 outc('x', dest);
390 /*FALLTHROUGH*/
391 case 'x':
392 /* we don't implement 'x'; treat like 'X' */
393 case 'X':
394 base = 16;
395uns_number: /* an unsigned number */
396 sign = 0;
397#ifdef BSD4_4
398 if (isquad)
399 num = va_arg(ap, u_quad_t);
400 else
401#endif
402 if (islong)
403 num = va_arg(ap, unsigned long);
404 else
405 num = va_arg(ap, unsigned int);
406number: /* process a number */
407 p = temp + TEMPSIZE - 1;
408 *p = '\0';
409 while (num) {
410 *--p = digit[num % base];
411 num /= base;
412 }
413 len = (temp + TEMPSIZE - 1) - p;
414 if (prec < 0)
415 prec = 1;
416 if (sharp && *f == 'o' && prec <= len)
417 prec = len + 1;
418 pad = 0;
419 if (width) {
420 size = len;
421 if (size < prec)
422 size = prec;
423 size += sign;
424 pad = width - size;
425 if (flushleft == 0) {
426 while (--pad >= 0)
427 outc(' ', dest);
428 }
429 }
430 if (sign)
431 outc('-', dest);
432 prec -= len;
433 while (--prec >= 0)
434 outc('0', dest);
435 while (*p)
436 outc(*p++, dest);
437 while (--pad >= 0)
438 outc(' ', dest);
439 break;
440 case 's':
441 p = va_arg(ap, char *);
442 pad = 0;
443 if (width) {
444 len = strlen(p);
445 if (prec >= 0 && len > prec)
446 len = prec;
447 pad = width - len;
448 if (flushleft == 0) {
449 while (--pad >= 0)
450 outc(' ', dest);
451 }
452 }
453 prec++;
454 while (--prec != 0 && *p)
455 outc(*p++, dest);
456 while (--pad >= 0)
457 outc(' ', dest);
458 break;
459 case 'c':
460 c = va_arg(ap, int);
461 outc(c, dest);
462 break;
463 default:
464 outc(*f, dest);
465 break;
466 }
467 f++;
468 }
469#endif /* !HAVE_VASPRINTF */
470}
471
472
473
474/*
475 * Version of write which resumes after a signal is caught.
476 */
477
478int
479xwrite(int fd, char *buf, int nbytes)
480{
481 int ntry;
482 int i;
483 int n;
484
485 n = nbytes;
486 ntry = 0;
487 for (;;) {
488 i = write(fd, buf, n);
489 if (i > 0) {
490 if ((n -= i) <= 0)
491 return nbytes;
492 buf += i;
493 ntry = 0;
494 } else if (i == 0) {
495 if (++ntry > 10)
496 return nbytes - n;
497 } else if (errno != EINTR) {
498 return -1;
499 }
500 }
501}
502
503
504/*
505 * Version of ioctl that retries after a signal is caught.
506 * XXX unused function
507 */
508
509int
510xioctl(int fd, unsigned long request, char *arg)
511{
512 int i;
513
514 while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
515 return i;
516}
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