bin/sh/output.c

   1 /*      $NetBSD: output.c,v 1.30 2008/10/12 01:40:37 dholland 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 1.30 2008/10/12 01:40:37 dholland 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 void
 268 dprintf(const char *fmt, ...)
 269 {
 270         va_list ap;
 271
 272         va_start(ap, fmt);
 273         doformat(out2, fmt, ap);
 274         va_end(ap);
 275         flushout(out2);
 276 }
 277
 278 void
 279 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
 280 {
 281         va_list ap;
 282         struct output strout;
 283
 284         va_start(ap, fmt);
 285         strout.nextc = outbuf;
 286         strout.nleft = length;
 287         strout.fd = BLOCK_OUT;
 288         strout.flags = 0;
 289         doformat(&strout, fmt, ap);
 290         outc('\0', &strout);
 291         if (strout.flags & OUTPUT_ERR)
 292                 outbuf[length - 1] = '\0';
 293         va_end(ap);
 294 }
 295
 296 /*
 297  * Formatted output.  This routine handles a subset of the printf formats:
 298  * - Formats supported: d, u, o, p, X, s, and c.
 299  * - The x format is also accepted but is treated like X.
 300  * - The l, ll and q modifiers are accepted.
 301  * - The - and # flags are accepted; # only works with the o format.
 302  * - Width and precision may be specified with any format except c.
 303  * - An * may be given for the width or precision.
 304  * - The obsolete practice of preceding the width with a zero to get
 305  *   zero padding is not supported; use the precision field.
 306  * - A % may be printed by writing %% in the format string.
 307  */
 308
 309 #define TEMPSIZE 24
 310
 311 #ifdef BSD4_4
 312 #define HAVE_VASPRINTF 1
 313 #endif
 314
 315 void
 316 doformat(struct output *dest, const char *f, va_list ap)
 317 {
 318 #if     HAVE_VASPRINTF
 319         char *s;
 320
 321         vasprintf(&s, f, ap);
 322         if (s == NULL)
 323                 error("Could not allocate formatted output buffer");
 324         outstr(s, dest);
 325         free(s);
 326 #else   /* !HAVE_VASPRINTF */
 327         static const char digit[] = "0123456789ABCDEF";
 328         char c;
 329         char temp[TEMPSIZE];
 330         int flushleft;
 331         int sharp;
 332         int width;
 333         int prec;
 334         int islong;
 335         int isquad;
 336         char *p;
 337         int sign;
 338 #ifdef BSD4_4
 339         quad_t l;
 340         u_quad_t num;
 341 #else
 342         long l;
 343         u_long num;
 344 #endif
 345         unsigned base;
 346         int len;
 347         int size;
 348         int pad;
 349
 350         while ((c = *f++) != '\0') {
 351                 if (c != '%') {
 352                         outc(c, dest);
 353                         continue;
 354                 }
 355                 flushleft = 0;
 356                 sharp = 0;
 357                 width = 0;
 358                 prec = -1;
 359                 islong = 0;
 360                 isquad = 0;
 361                 for (;;) {
 362                         if (*f == '-')
 363                                 flushleft++;
 364                         else if (*f == '#')
 365                                 sharp++;
 366                         else
 367                                 break;
 368                         f++;
 369                 }
 370                 if (*f == '*') {
 371                         width = va_arg(ap, int);
 372                         f++;
 373                 } else {
 374                         while (is_digit(*f)) {
 375                                 width = 10 * width + digit_val(*f++);
 376                         }
 377                 }
 378                 if (*f == '.') {
 379                         if (*++f == '*') {
 380                                 prec = va_arg(ap, int);
 381                                 f++;
 382                         } else {
 383                                 prec = 0;
 384                                 while (is_digit(*f)) {
 385                                         prec = 10 * prec + digit_val(*f++);
 386                                 }
 387                         }
 388                 }
 389                 if (*f == 'l') {
 390                         f++;
 391                         if (*f == 'l') {
 392                                 isquad++;
 393                                 f++;
 394                         } else
 395                                 islong++;
 396                 } else if (*f == 'q') {
 397                         isquad++;
 398                         f++;
 399                 }
 400                 switch (*f) {
 401                 case 'd':
 402 #ifdef BSD4_4
 403                         if (isquad)
 404                                 l = va_arg(ap, quad_t);
 405                         else
 406 #endif
 407                         if (islong)
 408                                 l = va_arg(ap, long);
 409                         else
 410                                 l = va_arg(ap, int);
 411                         sign = 0;
 412                         num = l;
 413                         if (l < 0) {
 414                                 num = -l;
 415                                 sign = 1;
 416                         }
 417                         base = 10;
 418                         goto number;
 419                 case 'u':
 420                         base = 10;
 421                         goto uns_number;
 422                 case 'o':
 423                         base = 8;
 424                         goto uns_number;
 425                 case 'p':
 426                         outc('0', dest);
 427                         outc('x', dest);
 428                         /*FALLTHROUGH*/
 429                 case 'x':
 430                         /* we don't implement 'x'; treat like 'X' */
 431                 case 'X':
 432                         base = 16;
 433 uns_number:       /* an unsigned number */
 434                         sign = 0;
 435 #ifdef BSD4_4
 436                         if (isquad)
 437                                 num = va_arg(ap, u_quad_t);
 438                         else
 439 #endif
 440                         if (islong)
 441                                 num = va_arg(ap, unsigned long);
 442                         else
 443                                 num = va_arg(ap, unsigned int);
 444 number:           /* process a number */
 445                         p = temp + TEMPSIZE - 1;
 446                         *p = '\0';
 447                         while (num) {
 448                                 *--p = digit[num % base];
 449                                 num /= base;
 450                         }
 451                         len = (temp + TEMPSIZE - 1) - p;
 452                         if (prec < 0)
 453                                 prec = 1;
 454                         if (sharp && *f == 'o' && prec <= len)
 455                                 prec = len + 1;
 456                         pad = 0;
 457                         if (width) {
 458                                 size = len;
 459                                 if (size < prec)
 460                                         size = prec;
 461                                 size += sign;
 462                                 pad = width - size;
 463                                 if (flushleft == 0) {
 464                                         while (--pad >= 0)
 465                                                 outc(' ', dest);
 466                                 }
 467                         }
 468                         if (sign)
 469                                 outc('-', dest);
 470                         prec -= len;
 471                         while (--prec >= 0)
 472                                 outc('0', dest);
 473                         while (*p)
 474                                 outc(*p++, dest);
 475                         while (--pad >= 0)
 476                                 outc(' ', dest);
 477                         break;
 478                 case 's':
 479                         p = va_arg(ap, char *);
 480                         pad = 0;
 481                         if (width) {
 482                                 len = strlen(p);
 483                                 if (prec >= 0 && len > prec)
 484                                         len = prec;
 485                                 pad = width - len;
 486                                 if (flushleft == 0) {
 487                                         while (--pad >= 0)
 488                                                 outc(' ', dest);
 489                                 }
 490                         }
 491                         prec++;
 492                         while (--prec != 0 && *p)
 493                                 outc(*p++, dest);
 494                         while (--pad >= 0)
 495                                 outc(' ', dest);
 496                         break;
 497                 case 'c':
 498                         c = va_arg(ap, int);
 499                         outc(c, dest);
 500                         break;
 501                 default:
 502                         outc(*f, dest);
 503                         break;
 504                 }
 505                 f++;
 506         }
 507 #endif  /* !HAVE_VASPRINTF */
 508 }
 509
 510
 511
 512 /*
 513  * Version of write which resumes after a signal is caught.
 514  */
 515
 516 int
 517 xwrite(int fd, char *buf, int nbytes)
 518 {
 519         int ntry;
 520         int i;
 521         int n;
 522
 523         n = nbytes;
 524         ntry = 0;
 525         for (;;) {
 526                 i = write(fd, buf, n);
 527                 if (i > 0) {
 528                         if ((n -= i) <= 0)
 529                                 return nbytes;
 530                         buf += i;
 531                         ntry = 0;
 532                 } else if (i == 0) {
 533                         if (++ntry > 10)
 534                                 return nbytes - n;
 535                 } else if (errno != EINTR) {
 536                         return -1;
 537                 }
 538         }
 539 }
 540
 541
 542 /*
 543  * Version of ioctl that retries after a signal is caught.
 544  * XXX unused function
 545  */
 546
 547 int
 548 xioctl(int fd, unsigned long request, char *arg)
 549 {
 550         int i;
 551
 552         while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
 553         return i;
 554 }