src/kash/output.c

   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 #if 0
  36 #ifndef lint
  37 static char sccsid[] = "@(#)output.c    8.2 (Berkeley) 5/4/95";
  38 #else
  39 __RCSID("$NetBSD: output.c,v 1.28 2003/08/07 09:05:36 agc Exp $");
  40 #endif /* not lint */
  41 #endif
  42
  43 /*
  44  * Shell output routines.  We use our own output routines because:
  45  *      When a builtin command is interrupted we have to discard
  46  *              any pending output.
  47  *      When a builtin command appears in back quotes, we want to
  48  *              save the output of the command in a region obtained
  49  *              via malloc, rather than doing a fork and reading the
  50  *              output of the command via a pipe.
  51  *      Our output routines may be smaller than the stdio routines.
  52  */
  53
  54 #include <sys/types.h>
  55
  56 #include <stdio.h>      /* defines BUFSIZ */
  57 #include <string.h>
  58 #include <errno.h>
  59 #include <stdlib.h>
  60
  61 #include "shell.h"
  62 #include "syntax.h"
  63 #include "output.h"
  64 #include "memalloc.h"
  65 #include "error.h"
  66 #include "shinstance.h"
  67
  68 //#define OUTBUFSIZ BUFSIZ
  69 #define BLOCK_OUT -2            /* output to a fixed block of memory */
  70 //#define MEM_OUT -3            /* output to dynamically allocated memory */
  71 #define OUTPUT_ERR 01           /* error occurred on output */
  72
  73
  74 //struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
  75 //struct output errout = {NULL, 0, NULL, 100, 2, 0};
  76 //struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
  77 //struct output *out1 = &output;
  78 //struct output *out2 = &errout;
  79
  80
  81
  82 #ifdef mkinit
  83
  84 INCLUDE "output.h"
  85 INCLUDE "memalloc.h"
  86
  87 RESET {
  88         psh->out1 = &psh->output;
  89         psh->out2 = &psh->errout;
  90         if (psh->memout.buf != NULL) {
  91                 ckfree(psh->memout.buf);
  92                 psh->memout.buf = NULL;
  93         }
  94 }
  95
  96 #endif
  97
  98
  99 #ifdef notdef   /* no longer used */
 100 /*
 101  * Set up an output file to write to memory rather than a file.
 102  */
 103
 104 void
 105 open_mem(char *block, int length, struct output *file)
 106 {
 107         file->nextc = block;
 108         file->nleft = --length;
 109         file->fd = BLOCK_OUT;
 110         file->flags = 0;
 111         file->psh = psh;
 112 }
 113 #endif
 114
 115
 116 void
 117 out1str(shinstance *psh, const char *p)
 118 {
 119         outstr(p, psh->out1);
 120 }
 121
 122
 123 void
 124 out2str(shinstance *psh, const char *p)
 125 {
 126         outstr(p, psh->out2);
 127 }
 128
 129
 130 void
 131 outstr(const char *p, struct output *file)
 132 {
 133         while (*p)
 134                 outc(*p++, file);
 135         if (file->psh && file == file->psh->out2)
 136                 flushout(file);
 137 }
 138
 139
 140 char out_junk[16];
 141
 142
 143 void
 144 emptyoutbuf(struct output *dest)
 145 {
 146         int offset;
 147         shinstance *psh = dest->psh;
 148
 149         if (dest->fd == BLOCK_OUT) {
 150                 dest->nextc = out_junk;
 151                 dest->nleft = sizeof out_junk;
 152                 dest->flags |= OUTPUT_ERR;
 153         } else if (dest->buf == NULL) {
 154                 INTOFF;
 155                 dest->buf = ckmalloc(dest->bufsize);
 156                 dest->nextc = dest->buf;
 157                 dest->nleft = dest->bufsize;
 158                 INTON;
 159         } else if (dest->fd == MEM_OUT) {
 160                 offset = dest->bufsize;
 161                 INTOFF;
 162                 dest->bufsize <<= 1;
 163                 dest->buf = ckrealloc(dest->buf, dest->bufsize);
 164                 dest->nleft = dest->bufsize - offset;
 165                 dest->nextc = dest->buf + offset;
 166                 INTON;
 167         } else {
 168                 flushout(dest);
 169         }
 170         dest->nleft--;
 171 }
 172
 173
 174 void
 175 output_flushall(shinstance *psh)
 176 {
 177         flushout(&psh->output);
 178         flushout(&psh->errout);
 179 }
 180
 181
 182 void
 183 flushout(struct output *dest)
 184 {
 185
 186         if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
 187                 return;
 188         if (xwrite(dest->psh, dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
 189                 dest->flags |= OUTPUT_ERR;
 190         dest->nextc = dest->buf;
 191         dest->nleft = dest->bufsize;
 192 }
 193
 194
 195 void
 196 freestdout(shinstance *psh)
 197 {
 198         INTOFF;
 199         if (psh->output.buf) {
 200                 ckfree(psh->output.buf);
 201                 psh->output.buf = NULL;
 202                 psh->output.nleft = 0;
 203         }
 204         INTON;
 205 }
 206
 207
 208 void
 209 outfmt(struct output *file, const char *fmt, ...)
 210 {
 211         va_list ap;
 212
 213         va_start(ap, fmt);
 214         doformat(file, fmt, ap);
 215         va_end(ap);
 216 }
 217
 218
 219 void
 220 out1fmt(shinstance *psh, const char *fmt, ...)
 221 {
 222         va_list ap;
 223
 224         va_start(ap, fmt);
 225         doformat(psh->out1, fmt, ap);
 226         va_end(ap);
 227 }
 228
 229 void
 230 dprintf(shinstance *psh, const char *fmt, ...)
 231 {
 232         va_list ap;
 233
 234         va_start(ap, fmt);
 235         doformat(psh->out2, fmt, ap);
 236         va_end(ap);
 237         flushout(psh->out2);
 238 }
 239
 240 void
 241 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
 242 {
 243         va_list ap;
 244         struct output strout;
 245
 246         va_start(ap, fmt);
 247         strout.nextc = outbuf;
 248         strout.nleft = (int)length;
 249         strout.fd = BLOCK_OUT;
 250         strout.flags = 0;
 251         strout.psh = NULL;
 252         doformat(&strout, fmt, ap);
 253         outc('\0', &strout);
 254         if (strout.flags & OUTPUT_ERR)
 255                 outbuf[length - 1] = '\0';
 256         va_end(ap);
 257 }
 258
 259 /*
 260  * Formatted output.  This routine handles a subset of the printf formats:
 261  * - Formats supported: d, u, o, p, X, s, and c.
 262  * - The x format is also accepted but is treated like X.
 263  * - The l, ll and q modifiers are accepted.
 264  * - The - and # flags are accepted; # only works with the o format.
 265  * - Width and precision may be specified with any format except c.
 266  * - An * may be given for the width or precision.
 267  * - The obsolete practice of preceding the width with a zero to get
 268  *   zero padding is not supported; use the precision field.
 269  * - A % may be printed by writing %% in the format string.
 270  */
 271
 272 #define TEMPSIZE 32
 273
 274 #ifdef BSD4_4
 275 #define HAVE_VASPRINTF 1
 276 #endif
 277
 278 void
 279 doformat(struct output *dest, const char *f, va_list ap)
 280 {
 281 #ifdef HAVE_VASPRINTF
 282         char *s;
 283
 284         vasprintf(&s, f, ap);
 285         outstr(s, dest);
 286         free(s);
 287 #else   /* !HAVE_VASPRINTF */
 288         static const char digit_lower[] = "0123456789abcdef";
 289         static const char digit_upper[] = "0123456789ABCDEF";
 290         const char *digit;
 291         char c;
 292         char temp[TEMPSIZE];
 293         int flushleft;
 294         int sharp;
 295         int width;
 296         int prec;
 297         int islong;
 298         int isquad;
 299         char *p;
 300         int sign;
 301         int64_t l;
 302         uint64_t num;
 303         unsigned base;
 304         int len;
 305         int size;
 306         int pad;
 307
 308         while ((c = *f++) != '\0') {
 309                 if (c != '%') {
 310                         outc(c, dest);
 311                         continue;
 312                 }
 313                 flushleft = 0;
 314                 sharp = 0;
 315                 width = 0;
 316                 prec = -1;
 317                 islong = 0;
 318                 isquad = 0;
 319                 for (;;) {
 320                         if (*f == '-')
 321                                 flushleft++;
 322                         else if (*f == '#')
 323                                 sharp++;
 324                         else
 325                                 break;
 326                         f++;
 327                 }
 328                 if (*f == '*') {
 329                         width = va_arg(ap, int);
 330                         f++;
 331                 } else {
 332                         while (is_digit(*f)) {
 333                                 width = 10 * width + digit_val(*f++);
 334                         }
 335                 }
 336                 if (*f == '.') {
 337                         if (*++f == '*') {
 338                                 prec = va_arg(ap, int);
 339                                 f++;
 340                         } else {
 341                                 prec = 0;
 342                                 while (is_digit(*f)) {
 343                                         prec = 10 * prec + digit_val(*f++);
 344                                 }
 345                         }
 346                 }
 347                 if (*f == 'l') {
 348                         f++;
 349                         if (*f == 'l') {
 350                                 isquad++;
 351                                 f++;
 352                         } else
 353                                 islong++;
 354                 } else if (*f == 'q') {
 355                         isquad++;
 356                         f++;
 357                 }
 358                 digit = digit_upper;
 359                 switch (*f) {
 360                 case 'd':
 361                         if (isquad)
 362                                 l = va_arg(ap, int64_t);
 363                         else if (islong)
 364                                 l = va_arg(ap, long);
 365                         else
 366                                 l = va_arg(ap, int);
 367                         sign = 0;
 368                         num = l;
 369                         if (l < 0) {
 370                                 num = -l;
 371                                 sign = 1;
 372                         }
 373                         base = 10;
 374                         goto number;
 375                 case 'u':
 376                         base = 10;
 377                         goto uns_number;
 378                 case 'o':
 379                         base = 8;
 380                         goto uns_number;
 381                 case 'p':
 382                         outc('0', dest);
 383                         outc('x', dest);
 384                         /*FALLTHROUGH*/
 385                 case 'x':
 386                         /* we don't implement 'x'; treat like 'X' */
 387                         digit = digit_lower;
 388                 case 'X':
 389                         base = 16;
 390 uns_number:       /* an unsigned number */
 391                         sign = 0;
 392                         if (isquad)
 393                                 num = va_arg(ap, uint64_t);
 394                         else if (islong)
 395                                 num = va_arg(ap, unsigned long);
 396                         else
 397                                 num = va_arg(ap, unsigned int);
 398 number:           /* process a number */
 399                         p = temp + TEMPSIZE - 1;
 400                         *p = '\0';
 401                         while (num) {
 402                                 *--p = digit[num % base];
 403                                 num /= base;
 404                         }
 405                         len = (int)((temp + TEMPSIZE - 1) - p);
 406                         if (prec < 0)
 407                                 prec = 1;
 408                         if (sharp && *f == 'o' && prec <= len)
 409                                 prec = len + 1;
 410                         pad = 0;
 411                         if (width) {
 412                                 size = len;
 413                                 if (size < prec)
 414                                         size = prec;
 415                                 size += sign;
 416                                 pad = width - size;
 417                                 if (flushleft == 0) {
 418                                         while (--pad >= 0)
 419                                                 outc(' ', dest);
 420                                 }
 421                         }
 422                         if (sign)
 423                                 outc('-', dest);
 424                         prec -= len;
 425                         while (--prec >= 0)
 426                                 outc('0', dest);
 427                         while (*p)
 428                                 outc(*p++, dest);
 429                         while (--pad >= 0)
 430                                 outc(' ', dest);
 431                         break;
 432                 case 's':
 433                         p = va_arg(ap, char *);
 434                         pad = 0;
 435                         if (width) {
 436                                 len = (int)strlen(p);
 437                                 if (prec >= 0 && len > prec)
 438                                         len = prec;
 439                                 pad = width - len;
 440                                 if (flushleft == 0) {
 441                                         while (--pad >= 0)
 442                                                 outc(' ', dest);
 443                                 }
 444                         }
 445                         prec++;
 446                         while (--prec != 0 && *p)
 447                                 outc(*p++, dest);
 448                         while (--pad >= 0)
 449                                 outc(' ', dest);
 450                         break;
 451                 case 'c':
 452                         c = va_arg(ap, int);
 453                         outc(c, dest);
 454                         break;
 455                 default:
 456                         outc(*f, dest);
 457                         break;
 458                 }
 459                 f++;
 460         }
 461 #endif  /* !HAVE_VASPRINTF */
 462 }
 463
 464
 465
 466 /*
 467  * Version of write which resumes after a signal is caught.
 468  */
 469
 470 int
 471 xwrite(shinstance *psh, int fd, char *buf, size_t nbytes)
 472 {
 473         int ntry;
 474         long i;
 475         size_t n;
 476
 477         n = nbytes;
 478         ntry = 0;
 479         for (;;) {
 480                 i = shfile_write(&psh->fdtab, fd, buf, n);
 481                 if (i > 0) {
 482                         if ((n -= i) <= 0)
 483                                 return (int)nbytes;
 484                         buf += i;
 485                         ntry = 0;
 486                 } else if (i == 0) {
 487                         if (++ntry > 10)
 488                                 return (int)(nbytes - n);
 489                 } else if (errno != EINTR) {
 490                         return -1;
 491                 }
 492         }
 493 }