1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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/* 36 * Shell output routines. We use our own output routines because: 37 * When a builtin command is interrupted we have to discard 38 * any pending output. 39 * When a builtin command appears in back quotes, we want to 40 * save the output of the command in a region obtained 41 * via malloc, rather than doing a fork and reading the 42 * output of the command via a pipe. 43 */ 44 45#include <stdio.h> /* defines BUFSIZ */ 46#include <string.h> 47#include <stdarg.h> 48#include <errno.h> 49#include <unistd.h> 50#include <stdlib.h> 51#include <wchar.h> 52#include <wctype.h> 53 54#include "shell.h" 55#include "syntax.h" 56#include "output.h" 57#include "memalloc.h" 58#include "error.h" 59#include "var.h" 60 61 62#define OUTBUFSIZ BUFSIZ 63#define MEM_OUT -2 /* output to dynamically allocated memory */ 64#define OUTPUT_ERR 01 /* error occurred on output */ 65 66static int doformat_wr(void *, const char *, int); 67 68struct output output = {NULL, NULL, NULL, OUTBUFSIZ, 1, 0}; 69struct output errout = {NULL, NULL, NULL, 256, 2, 0}; 70struct output memout = {NULL, NULL, NULL, 64, MEM_OUT, 0}; 71struct output *out1 = &output; 72struct output *out2 = &errout; 73 74void 75outcslow(int c, struct output *file) 76{ 77 outc(c, file); 78} 79 80void 81out1str(const char *p) 82{ 83 outstr(p, out1); 84} 85 86void 87out1qstr(const char *p) 88{ 89 outqstr(p, out1); 90} 91 92void 93out2str(const char *p) 94{ 95 outstr(p, out2); 96} 97 98void 99out2qstr(const char *p) 100{ 101 outqstr(p, out2); 102} 103 104void 105outstr(const char *p, struct output *file) 106{ 107 outbin(p, strlen(p), file); 108} 109 110static void 111byteseq(int ch, struct output *file) 112{ 113 char seq[4]; 114 115 seq[0] = '\\'; 116 seq[1] = (ch >> 6 & 0x3) + '0'; 117 seq[2] = (ch >> 3 & 0x7) + '0'; 118 seq[3] = (ch & 0x7) + '0'; 119 outbin(seq, 4, file); 120} 121 122static void 123outdqstr(const char *p, struct output *file) 124{ 125 const char *end; 126 mbstate_t mbs; 127 size_t clen; 128 wchar_t wc; 129 130 memset(&mbs, '\0', sizeof(mbs)); 131 end = p + strlen(p); 132 outstr("$'", file); 133 while ((clen = mbrtowc(&wc, p, end - p + 1, &mbs)) != 0) { 134 if (clen == (size_t)-2) { 135 while (p < end) 136 byteseq(*p++, file); 137 break; 138 } 139 if (clen == (size_t)-1) { 140 memset(&mbs, '\0', sizeof(mbs)); 141 byteseq(*p++, file); 142 continue; 143 } 144 if (wc == L'\n') 145 outcslow('\n', file), p++; 146 else if (wc == L'\r') 147 outstr("\\r", file), p++; 148 else if (wc == L'\t') 149 outstr("\\t", file), p++; 150 else if (!iswprint(wc)) { 151 for (; clen > 0; clen--) 152 byteseq(*p++, file); 153 } else { 154 if (wc == L'\'' || wc == L'\\') 155 outcslow('\\', file); 156 outbin(p, clen, file); 157 p += clen; 158 } 159 } 160 outcslow('\'', file); 161} 162 163/* Like outstr(), but quote for re-input into the shell. */ 164void 165outqstr(const char *p, struct output *file) 166{ 167 int i; 168 169 if (p[0] == '\0') { 170 outstr("''", file); 171 return; 172 } 173 for (i = 0; p[i] != '\0'; i++) { 174 if ((p[i] > '\0' && p[i] < ' ' && p[i] != '\n') || 175 (p[i] & 0x80) != 0 || p[i] == '\'') { 176 outdqstr(p, file); 177 return; 178 } 179 } 180 181 if (p[strcspn(p, "|&;<>()$`\\\" \n*?[~#=")] == '\0' || 182 strcmp(p, "[") == 0) { 183 outstr(p, file); 184 return; 185 } 186 187 outcslow('\'', file); 188 outstr(p, file); 189 outcslow('\'', file); 190} 191 192void 193outbin(const void *data, size_t len, struct output *file) 194{ 195 const char *p; 196 197 p = data; 198 while (len-- > 0) 199 outc(*p++, file); 200} 201 202void 203emptyoutbuf(struct output *dest) 204{ 205 int offset, newsize; 206 207 if (dest->buf == NULL) { 208 INTOFF; 209 dest->buf = ckmalloc(dest->bufsize); 210 dest->nextc = dest->buf; 211 dest->bufend = dest->buf + dest->bufsize; 212 INTON; 213 } else if (dest->fd == MEM_OUT) { 214 offset = dest->nextc - dest->buf; 215 newsize = dest->bufsize << 1; 216 INTOFF; 217 dest->buf = ckrealloc(dest->buf, newsize); 218 dest->bufsize = newsize; 219 dest->bufend = dest->buf + newsize; 220 dest->nextc = dest->buf + offset; 221 INTON; 222 } else { 223 flushout(dest); 224 } 225} 226 227 228void 229flushall(void) 230{ 231 flushout(&output); 232 flushout(&errout); 233} 234 235 236void 237flushout(struct output *dest) 238{ 239 240 if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0) 241 return; 242 if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0) 243 dest->flags |= OUTPUT_ERR; 244 dest->nextc = dest->buf; 245} 246 247 248void 249freestdout(void) 250{ 251 output.nextc = output.buf; 252} 253 254 255int 256outiserror(struct output *file) 257{ 258 return (file->flags & OUTPUT_ERR); 259} 260 261 262void 263outclearerror(struct output *file) 264{ 265 file->flags &= ~OUTPUT_ERR; 266} 267 268 269void 270outfmt(struct output *file, const char *fmt, ...) 271{ 272 va_list ap; 273 274 va_start(ap, fmt); 275 doformat(file, fmt, ap); 276 va_end(ap); 277} 278 279 280void 281out1fmt(const char *fmt, ...) 282{ 283 va_list ap; 284 285 va_start(ap, fmt); 286 doformat(out1, fmt, ap); 287 va_end(ap); 288} 289 290void 291out2fmt_flush(const char *fmt, ...) 292{ 293 va_list ap; 294 295 va_start(ap, fmt); 296 doformat(out2, fmt, ap); 297 va_end(ap); 298 flushout(out2); 299} 300 301void 302fmtstr(char *outbuf, int length, const char *fmt, ...) 303{ 304 va_list ap; 305 306 INTOFF; 307 va_start(ap, fmt); 308 vsnprintf(outbuf, length, fmt, ap); 309 va_end(ap); 310 INTON; 311} 312 313static int 314doformat_wr(void *cookie, const char *buf, int len) 315{ 316 struct output *o; 317 318 o = (struct output *)cookie; 319 outbin(buf, len, o); 320 321 return (len); 322} 323 324void 325doformat(struct output *dest, const char *f, va_list ap) 326{ 327 FILE *fp; 328 329 if ((fp = fwopen(dest, doformat_wr)) != NULL) { 330 vfprintf(fp, f, ap); 331 fclose(fp); 332 } 333} 334 335FILE * 336out1fp(void) 337{ 338 return fwopen(out1, doformat_wr); 339} 340 341/* 342 * Version of write which resumes after a signal is caught. 343 */ 344 345int 346xwrite(int fd, const char *buf, int nbytes) 347{ 348 int ntry; 349 int i; 350 int n; 351 352 n = nbytes; 353 ntry = 0; 354 for (;;) { 355 i = write(fd, buf, n); 356 if (i > 0) { 357 if ((n -= i) <= 0) 358 return nbytes; 359 buf += i; 360 ntry = 0; 361 } else if (i == 0) { 362 if (++ntry > 10) 363 return nbytes - n; 364 } else if (errno != EINTR) { 365 return -1; 366 } 367 } 368} 369