2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 5/4/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 * Shell output routines. We use our own output routines because:
43 * When a builtin command is interrupted we have to discard
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.
51 #include <stdio.h> /* defines BUFSIZ */
66 #define OUTBUFSIZ BUFSIZ
67 #define MEM_OUT -2 /* output to dynamically allocated memory */
68 #define OUTPUT_ERR 01 /* error occurred on output */
70 static int doformat_wr(void *, const char *, int);
72 struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
73 struct output errout = {NULL, 0, NULL, 256, 2, 0};
74 struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
75 struct output *out1 = &output;
76 struct output *out2 = &errout;
79 outcslow(int c, struct output *file)
85 out1str(const char *p)
91 out1qstr(const char *p)
97 out2str(const char *p)
103 out2qstr(const char *p)
109 outstr(const char *p, struct output *file)
111 outbin(p, strlen(p), file);
114 /* Like outstr(), but quote for re-input into the shell. */
116 outqstr(const char *p, struct output *file)
125 /* Caller will handle '=' if necessary */
126 if (p[strcspn(p, "|&;<>()$`\\\"' \t\n*?[~#")] == '\0' ||
127 strcmp(p, "[") == 0) {
133 while ((ch = *p++) != '\0') {
136 /* Can't quote single quotes inside single quotes. */
138 outcslow('\'', file);
144 outcslow('\'', file);
150 outcslow('\'', file);
154 outbin(const void *data, size_t len, struct output *file)
164 emptyoutbuf(struct output *dest)
168 if (dest->buf == NULL) {
170 dest->buf = ckmalloc(dest->bufsize);
171 dest->nextc = dest->buf;
172 dest->nleft = dest->bufsize;
174 } else if (dest->fd == MEM_OUT) {
175 offset = dest->bufsize;
178 dest->buf = ckrealloc(dest->buf, dest->bufsize);
179 dest->nleft = dest->bufsize - offset;
180 dest->nextc = dest->buf + offset;
198 flushout(struct output *dest)
201 if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
203 if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
204 dest->flags |= OUTPUT_ERR;
205 dest->nextc = dest->buf;
206 dest->nleft = dest->bufsize;
224 outiserror(struct output *file)
226 return (file->flags & OUTPUT_ERR);
231 outclearerror(struct output *file)
233 file->flags &= ~OUTPUT_ERR;
238 outfmt(struct output *file, const char *fmt, ...)
243 doformat(file, fmt, ap);
249 out1fmt(const char *fmt, ...)
254 doformat(out1, fmt, ap);
259 out2fmt_flush(const char *fmt, ...)
264 doformat(out2, fmt, ap);
270 fmtstr(char *outbuf, int length, const char *fmt, ...)
276 vsnprintf(outbuf, length, fmt, ap);
282 doformat_wr(void *cookie, const char *buf, int len)
286 o = (struct output *)cookie;
293 doformat(struct output *dest, const char *f, va_list ap)
297 if ((fp = fwopen(dest, doformat_wr)) != NULL) {
304 * Version of write which resumes after a signal is caught.
308 xwrite(int fd, const char *buf, int nbytes)
317 i = write(fd, buf, n);
326 } else if (errno != EINTR) {