bin/sh/output.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)output.c    8.2 (Berkeley) 5/4/95";
  36 #endif
  37 #endif /* not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  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  */
  50
  51 #include <stdio.h>      /* defines BUFSIZ */
  52 #include <string.h>
  53 #include <stdarg.h>
  54 #include <errno.h>
  55 #include <unistd.h>
  56 #include <stdlib.h>
  57 #include <wchar.h>
  58 #include <wctype.h>
  59
  60 #include "shell.h"
  61 #include "syntax.h"
  62 #include "output.h"
  63 #include "memalloc.h"
  64 #include "error.h"
  65 #include "var.h"
  66
  67
  68 #define OUTBUFSIZ BUFSIZ
  69 #define MEM_OUT -2              /* output to dynamically allocated memory */
  70 #define OUTPUT_ERR 01           /* error occurred on output */
  71
  72 static int doformat_wr(void *, const char *, int);
  73
  74 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
  75 struct output errout = {NULL, 0, NULL, 256, 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 void
  81 outcslow(int c, struct output *file)
  82 {
  83         outc(c, file);
  84 }
  85
  86 void
  87 out1str(const char *p)
  88 {
  89         outstr(p, out1);
  90 }
  91
  92 void
  93 out1qstr(const char *p)
  94 {
  95         outqstr(p, out1);
  96 }
  97
  98 void
  99 out2str(const char *p)
 100 {
 101         outstr(p, out2);
 102 }
 103
 104 void
 105 out2qstr(const char *p)
 106 {
 107         outqstr(p, out2);
 108 }
 109
 110 void
 111 outstr(const char *p, struct output *file)
 112 {
 113         outbin(p, strlen(p), file);
 114 }
 115
 116 static void
 117 byteseq(int ch, struct output *file)
 118 {
 119         char seq[4];
 120
 121         seq[0] = '\\';
 122         seq[1] = (ch >> 6 & 0x3) + '0';
 123         seq[2] = (ch >> 3 & 0x7) + '0';
 124         seq[3] = (ch & 0x7) + '0';
 125         outbin(seq, 4, file);
 126 }
 127
 128 static void
 129 outdqstr(const char *p, struct output *file)
 130 {
 131         const char *end;
 132         mbstate_t mbs;
 133         size_t clen;
 134         wchar_t wc;
 135
 136         memset(&mbs, '\0', sizeof(mbs));
 137         end = p + strlen(p);
 138         outstr("$'", file);
 139         while ((clen = mbrtowc(&wc, p, end - p + 1, &mbs)) != 0) {
 140                 if (clen == (size_t)-2) {
 141                         while (p < end)
 142                                 byteseq(*p++, file);
 143                         break;
 144                 }
 145                 if (clen == (size_t)-1) {
 146                         memset(&mbs, '\0', sizeof(mbs));
 147                         byteseq(*p++, file);
 148                         continue;
 149                 }
 150                 if (wc == L'\n')
 151                         outcslow('\n', file), p++;
 152                 else if (wc == L'\r')
 153                         outstr("\\r", file), p++;
 154                 else if (wc == L'\t')
 155                         outstr("\\t", file), p++;
 156                 else if (!iswprint(wc)) {
 157                         for (; clen > 0; clen--)
 158                                 byteseq(*p++, file);
 159                 } else {
 160                         if (wc == L'\'' || wc == L'\\')
 161                                 outcslow('\\', file);
 162                         outbin(p, clen, file);
 163                         p += clen;
 164                 }
 165         }
 166         outcslow('\'', file);
 167 }
 168
 169 /* Like outstr(), but quote for re-input into the shell. */
 170 void
 171 outqstr(const char *p, struct output *file)
 172 {
 173         int i;
 174
 175         if (p[0] == '\0') {
 176                 outstr("''", file);
 177                 return;
 178         }
 179         for (i = 0; p[i] != '\0'; i++) {
 180                 if ((p[i] > '\0' && p[i] < ' ' && p[i] != '\n') ||
 181                     (p[i] & 0x80) != 0 || p[i] == '\'') {
 182                         outdqstr(p, file);
 183                         return;
 184                 }
 185         }
 186
 187         if (p[strcspn(p, "|&;<>()$`\\\" \n*?[~#=")] == '\0' ||
 188                         strcmp(p, "[") == 0) {
 189                 outstr(p, file);
 190                 return;
 191         }
 192
 193                                 outcslow('\'', file);
 194         outstr(p, file);
 195                 outcslow('\'', file);
 196 }
 197
 198 void
 199 outbin(const void *data, size_t len, struct output *file)
 200 {
 201         const char *p;
 202
 203         p = data;
 204         while (len-- > 0)
 205                 outc(*p++, file);
 206 }
 207
 208 void
 209 emptyoutbuf(struct output *dest)
 210 {
 211         int offset;
 212
 213         if (dest->buf == NULL) {
 214                 INTOFF;
 215                 dest->buf = ckmalloc(dest->bufsize);
 216                 dest->nextc = dest->buf;
 217                 dest->nleft = dest->bufsize;
 218                 INTON;
 219         } else if (dest->fd == MEM_OUT) {
 220                 offset = dest->bufsize;
 221                 INTOFF;
 222                 dest->bufsize <<= 1;
 223                 dest->buf = ckrealloc(dest->buf, dest->bufsize);
 224                 dest->nleft = dest->bufsize - offset;
 225                 dest->nextc = dest->buf + offset;
 226                 INTON;
 227         } else {
 228                 flushout(dest);
 229         }
 230         dest->nleft--;
 231 }
 232
 233
 234 void
 235 flushall(void)
 236 {
 237         flushout(&output);
 238         flushout(&errout);
 239 }
 240
 241
 242 void
 243 flushout(struct output *dest)
 244 {
 245
 246         if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
 247                 return;
 248         if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
 249                 dest->flags |= OUTPUT_ERR;
 250         dest->nextc = dest->buf;
 251         dest->nleft = dest->bufsize;
 252 }
 253
 254
 255 void
 256 freestdout(void)
 257 {
 258         INTOFF;
 259         if (output.buf) {
 260                 ckfree(output.buf);
 261                 output.buf = NULL;
 262                 output.nleft = 0;
 263         }
 264         INTON;
 265 }
 266
 267
 268 int
 269 outiserror(struct output *file)
 270 {
 271         return (file->flags & OUTPUT_ERR);
 272 }
 273
 274
 275 void
 276 outclearerror(struct output *file)
 277 {
 278         file->flags &= ~OUTPUT_ERR;
 279 }
 280
 281
 282 void
 283 outfmt(struct output *file, const char *fmt, ...)
 284 {
 285         va_list ap;
 286
 287         va_start(ap, fmt);
 288         doformat(file, fmt, ap);
 289         va_end(ap);
 290 }
 291
 292
 293 void
 294 out1fmt(const char *fmt, ...)
 295 {
 296         va_list ap;
 297
 298         va_start(ap, fmt);
 299         doformat(out1, fmt, ap);
 300         va_end(ap);
 301 }
 302
 303 void
 304 out2fmt_flush(const char *fmt, ...)
 305 {
 306         va_list ap;
 307
 308         va_start(ap, fmt);
 309         doformat(out2, fmt, ap);
 310         va_end(ap);
 311         flushout(out2);
 312 }
 313
 314 void
 315 fmtstr(char *outbuf, int length, const char *fmt, ...)
 316 {
 317         va_list ap;
 318
 319         INTOFF;
 320         va_start(ap, fmt);
 321         vsnprintf(outbuf, length, fmt, ap);
 322         va_end(ap);
 323         INTON;
 324 }
 325
 326 static int
 327 doformat_wr(void *cookie, const char *buf, int len)
 328 {
 329         struct output *o;
 330
 331         o = (struct output *)cookie;
 332         outbin(buf, len, o);
 333
 334         return (len);
 335 }
 336
 337 void
 338 doformat(struct output *dest, const char *f, va_list ap)
 339 {
 340         FILE *fp;
 341
 342         if ((fp = fwopen(dest, doformat_wr)) != NULL) {
 343                 vfprintf(fp, f, ap);
 344                 fclose(fp);
 345         }
 346 }
 347
 348 /*
 349  * Version of write which resumes after a signal is caught.
 350  */
 351
 352 int
 353 xwrite(int fd, const char *buf, int nbytes)
 354 {
 355         int ntry;
 356         int i;
 357         int n;
 358
 359         n = nbytes;
 360         ntry = 0;
 361         for (;;) {
 362                 i = write(fd, buf, n);
 363                 if (i > 0) {
 364                         if ((n -= i) <= 0)
 365                                 return nbytes;
 366                         buf += i;
 367                         ntry = 0;
 368                 } else if (i == 0) {
 369                         if (++ntry > 10)
 370                                 return nbytes - n;
 371                 } else if (errno != EINTR) {
 372                         return -1;
 373                 }
 374         }
 375 }