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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)output.c 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/output.c,v 1.20 2005/12/08 21:00:39 stefanf Exp $ 38 * $DragonFly: src/bin/sh/output.c,v 1.4 2007/01/14 05:12:40 pavalos Exp $ 39 */ 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 58 #include "shell.h" 59 #include "syntax.h" 60 #include "output.h" 61 #include "memalloc.h" 62 #include "error.h" 63 #include "var.h" 64 65 66 #define OUTBUFSIZ BUFSIZ 67 #define BLOCK_OUT -2 /* output to a fixed block of memory */ 68 #define MEM_OUT -3 /* output to dynamically allocated memory */ 69 #define OUTPUT_ERR 01 /* error occurred on output */ 70 71 static int doformat_wr(void *, const char *, int); 72 73 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0}; 74 struct output errout = {NULL, 0, NULL, 100, 2, 0}; 75 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0}; 76 struct output *out1 = &output; 77 struct output *out2 = &errout; 78 79 80 81 #ifdef mkinit 82 83 INCLUDE "output.h" 84 INCLUDE "memalloc.h" 85 86 RESET { 87 out1 = &output; 88 out2 = &errout; 89 if (memout.buf != NULL) { 90 ckfree(memout.buf); 91 memout.buf = NULL; 92 } 93 } 94 95 #endif 96 97 98 void 99 out1str(const char *p) 100 { 101 outstr(p, out1); 102 } 103 104 void 105 out1qstr(const char *p) 106 { 107 outqstr(p, out1); 108 } 109 110 void 111 out2str(const char *p) 112 { 113 outstr(p, out2); 114 } 115 116 void 117 out2qstr(const char *p) 118 { 119 outqstr(p, out2); 120 } 121 122 void 123 outstr(const char *p, struct output *file) 124 { 125 while (*p) 126 outc(*p++, file); 127 if (file == out2) 128 flushout(file); 129 } 130 131 /* Like outstr(), but quote for re-input into the shell. */ 132 void 133 outqstr(const char *p, struct output *file) 134 { 135 char ch; 136 137 if (p[0] == '\0') { 138 outstr("''", file); 139 return; 140 } 141 if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() || 142 p[strcspn(p, ifsval())] == '\0')) { 143 outstr(p, file); 144 return; 145 } 146 147 out1c('\''); 148 while ((ch = *p++) != '\0') { 149 switch (ch) { 150 case '\'': 151 /* 152 * Can't quote single quotes inside single quotes; 153 * close them, write escaped single quote, open again. 154 */ 155 outstr("'\\''", file); 156 break; 157 default: 158 outc(ch, file); 159 } 160 } 161 out1c('\''); 162 } 163 164 STATIC char out_junk[16]; 165 166 void 167 emptyoutbuf(struct output *dest) 168 { 169 int offset; 170 171 if (dest->fd == BLOCK_OUT) { 172 dest->nextc = out_junk; 173 dest->nleft = sizeof out_junk; 174 dest->flags |= OUTPUT_ERR; 175 } else if (dest->buf == NULL) { 176 INTOFF; 177 dest->buf = ckmalloc(dest->bufsize); 178 dest->nextc = dest->buf; 179 dest->nleft = dest->bufsize; 180 INTON; 181 } else if (dest->fd == MEM_OUT) { 182 offset = dest->bufsize; 183 INTOFF; 184 dest->bufsize <<= 1; 185 dest->buf = ckrealloc(dest->buf, dest->bufsize); 186 dest->nleft = dest->bufsize - offset; 187 dest->nextc = dest->buf + offset; 188 INTON; 189 } else { 190 flushout(dest); 191 } 192 dest->nleft--; 193 } 194 195 196 void 197 flushall(void) 198 { 199 flushout(&output); 200 flushout(&errout); 201 } 202 203 204 void 205 flushout(struct output *dest) 206 { 207 208 if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0) 209 return; 210 if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0) 211 dest->flags |= OUTPUT_ERR; 212 dest->nextc = dest->buf; 213 dest->nleft = dest->bufsize; 214 } 215 216 217 void 218 freestdout(void) 219 { 220 INTOFF; 221 if (output.buf) { 222 ckfree(output.buf); 223 output.buf = NULL; 224 output.nleft = 0; 225 } 226 INTON; 227 } 228 229 230 void 231 outfmt(struct output *file, const char *fmt, ...) 232 { 233 va_list ap; 234 235 va_start(ap, fmt); 236 doformat(file, fmt, ap); 237 va_end(ap); 238 } 239 240 241 void 242 out1fmt(const char *fmt, ...) 243 { 244 va_list ap; 245 246 va_start(ap, fmt); 247 doformat(out1, fmt, ap); 248 va_end(ap); 249 } 250 251 void 252 dprintf(const char *fmt, ...) 253 { 254 va_list ap; 255 256 va_start(ap, fmt); 257 doformat(out2, fmt, ap); 258 va_end(ap); 259 flushout(out2); 260 } 261 262 void 263 fmtstr(char *outbuf, int length, const char *fmt, ...) 264 { 265 va_list ap; 266 struct output strout; 267 268 strout.nextc = outbuf; 269 strout.nleft = length; 270 strout.fd = BLOCK_OUT; 271 strout.flags = 0; 272 va_start(ap, fmt); 273 doformat(&strout, fmt, ap); 274 va_end(ap); 275 outc('\0', &strout); 276 if (strout.flags & OUTPUT_ERR) 277 outbuf[length - 1] = '\0'; 278 } 279 280 static int 281 doformat_wr(void *cookie, const char *buf, int len) 282 { 283 struct output *o; 284 int origlen; 285 unsigned char c; 286 287 o = (struct output *)cookie; 288 origlen = len; 289 while (len-- != 0) { 290 c = (unsigned char)*buf++; 291 outc(c, o); 292 } 293 294 return (origlen); 295 } 296 297 void 298 doformat(struct output *dest, const char *f, va_list ap) 299 { 300 FILE *fp; 301 302 if ((fp = fwopen(dest, doformat_wr)) != NULL) { 303 vfprintf(fp, f, ap); 304 fclose(fp); 305 } 306 } 307 308 /* 309 * Version of write which resumes after a signal is caught. 310 */ 311 312 int 313 xwrite(int fd, char *buf, int nbytes) 314 { 315 int ntry; 316 int i; 317 int n; 318 319 n = nbytes; 320 ntry = 0; 321 for (;;) { 322 i = write(fd, buf, n); 323 if (i > 0) { 324 if ((n -= i) <= 0) 325 return nbytes; 326 buf += i; 327 ntry = 0; 328 } else if (i == 0) { 329 if (++ntry > 10) 330 return nbytes - n; 331 } else if (errno != EINTR) { 332 return -1; 333 } 334 } 335 } 336