output.c revision 199629
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 * 4. 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 35static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 5/4/95"; 36#endif 37#endif /* not lint */ 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: head/bin/sh/output.c 199629 2009-11-21 14:28:32Z jilles $"); 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 71static int doformat_wr(void *, const char *, int); 72 73struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0}; 74struct output errout = {NULL, 0, NULL, 256, 2, 0}; 75struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0}; 76struct output *out1 = &output; 77struct output *out2 = &errout; 78 79 80 81#ifdef mkinit 82 83INCLUDE "output.h" 84INCLUDE "memalloc.h" 85 86RESET { 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 98void 99out1str(const char *p) 100{ 101 outstr(p, out1); 102} 103 104void 105out1qstr(const char *p) 106{ 107 outqstr(p, out1); 108} 109 110void 111out2str(const char *p) 112{ 113 outstr(p, out2); 114} 115 116void 117out2qstr(const char *p) 118{ 119 outqstr(p, out2); 120} 121 122void 123outstr(const char *p, struct output *file) 124{ 125 while (*p) 126 outc(*p++, file); 127} 128 129/* Like outstr(), but quote for re-input into the shell. */ 130void 131outqstr(const char *p, struct output *file) 132{ 133 char ch; 134 int inquotes; 135 136 if (p[0] == '\0') { 137 outstr("''", file); 138 return; 139 } 140 /* Caller will handle '=' if necessary */ 141 if (p[strcspn(p, "|&;<>()$`\\\"' \t\n*?[~#")] == '\0' || 142 strcmp(p, "[") == 0) { 143 outstr(p, file); 144 return; 145 } 146 147 inquotes = 0; 148 while ((ch = *p++) != '\0') { 149 switch (ch) { 150 case '\'': 151 /* Can't quote single quotes inside single quotes. */ 152 if (inquotes) 153 outc('\'', file); 154 inquotes = 0; 155 outstr("\\'", file); 156 break; 157 default: 158 if (!inquotes) 159 outc('\'', file); 160 inquotes = 1; 161 outc(ch, file); 162 } 163 } 164 if (inquotes) 165 outc('\'', file); 166} 167 168STATIC char out_junk[16]; 169 170void 171emptyoutbuf(struct output *dest) 172{ 173 int offset; 174 175 if (dest->fd == BLOCK_OUT) { 176 dest->nextc = out_junk; 177 dest->nleft = sizeof out_junk; 178 dest->flags |= OUTPUT_ERR; 179 } else if (dest->buf == NULL) { 180 INTOFF; 181 dest->buf = ckmalloc(dest->bufsize); 182 dest->nextc = dest->buf; 183 dest->nleft = dest->bufsize; 184 INTON; 185 } else if (dest->fd == MEM_OUT) { 186 offset = dest->bufsize; 187 INTOFF; 188 dest->bufsize <<= 1; 189 dest->buf = ckrealloc(dest->buf, dest->bufsize); 190 dest->nleft = dest->bufsize - offset; 191 dest->nextc = dest->buf + offset; 192 INTON; 193 } else { 194 flushout(dest); 195 } 196 dest->nleft--; 197} 198 199 200void 201flushall(void) 202{ 203 flushout(&output); 204 flushout(&errout); 205} 206 207 208void 209flushout(struct output *dest) 210{ 211 212 if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0) 213 return; 214 if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0) 215 dest->flags |= OUTPUT_ERR; 216 dest->nextc = dest->buf; 217 dest->nleft = dest->bufsize; 218} 219 220 221void 222freestdout(void) 223{ 224 INTOFF; 225 if (output.buf) { 226 ckfree(output.buf); 227 output.buf = NULL; 228 output.nleft = 0; 229 } 230 INTON; 231} 232 233 234void 235outfmt(struct output *file, const char *fmt, ...) 236{ 237 va_list ap; 238 239 va_start(ap, fmt); 240 doformat(file, fmt, ap); 241 va_end(ap); 242} 243 244 245void 246out1fmt(const char *fmt, ...) 247{ 248 va_list ap; 249 250 va_start(ap, fmt); 251 doformat(out1, fmt, ap); 252 va_end(ap); 253} 254 255void 256out2fmt_flush(const char *fmt, ...) 257{ 258 va_list ap; 259 260 va_start(ap, fmt); 261 doformat(out2, fmt, ap); 262 va_end(ap); 263 flushout(out2); 264} 265 266void 267fmtstr(char *outbuf, int length, const char *fmt, ...) 268{ 269 va_list ap; 270 struct output strout; 271 272 strout.nextc = outbuf; 273 strout.nleft = length; 274 strout.fd = BLOCK_OUT; 275 strout.flags = 0; 276 va_start(ap, fmt); 277 doformat(&strout, fmt, ap); 278 va_end(ap); 279 outc('\0', &strout); 280 if (strout.flags & OUTPUT_ERR) 281 outbuf[length - 1] = '\0'; 282} 283 284static int 285doformat_wr(void *cookie, const char *buf, int len) 286{ 287 struct output *o; 288 int origlen; 289 unsigned char c; 290 291 o = (struct output *)cookie; 292 origlen = len; 293 while (len-- != 0) { 294 c = (unsigned char)*buf++; 295 outc(c, o); 296 } 297 298 return (origlen); 299} 300 301void 302doformat(struct output *dest, const char *f, va_list ap) 303{ 304 FILE *fp; 305 306 if ((fp = fwopen(dest, doformat_wr)) != NULL) { 307 vfprintf(fp, f, ap); 308 fclose(fp); 309 } 310} 311 312/* 313 * Version of write which resumes after a signal is caught. 314 */ 315 316int 317xwrite(int fd, char *buf, int nbytes) 318{ 319 int ntry; 320 int i; 321 int n; 322 323 n = nbytes; 324 ntry = 0; 325 for (;;) { 326 i = write(fd, buf, n); 327 if (i > 0) { 328 if ((n -= i) <= 0) 329 return nbytes; 330 buf += i; 331 ntry = 0; 332 } else if (i == 0) { 333 if (++ntry > 10) 334 return nbytes - n; 335 } else if (errno != EINTR) { 336 return -1; 337 } 338 } 339} 340