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 } 376