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
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9 * modification, are permitted provided that the following conditions
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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
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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 $
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 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 */
71 static int doformat_wr(void *, const char *, int);
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;
89 if (memout.buf != NULL) {
99 out1str(const char *p)
105 out1qstr(const char *p)
111 out2str(const char *p)
117 out2qstr(const char *p)
123 outstr(const char *p, struct output *file)
131 /* Like outstr(), but quote for re-input into the shell. */
133 outqstr(const char *p, struct output *file)
141 if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() ||
142 p[strcspn(p, ifsval())] == '\0')) {
148 while ((ch = *p++) != '\0') {
152 * Can't quote single quotes inside single quotes;
153 * close them, write escaped single quote, open again.
155 outstr("'\\''", file);
164 STATIC char out_junk[16];
167 emptyoutbuf(struct output *dest)
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) {
177 dest->buf = ckmalloc(dest->bufsize);
178 dest->nextc = dest->buf;
179 dest->nleft = dest->bufsize;
181 } else if (dest->fd == MEM_OUT) {
182 offset = dest->bufsize;
185 dest->buf = ckrealloc(dest->buf, dest->bufsize);
186 dest->nleft = dest->bufsize - offset;
187 dest->nextc = dest->buf + offset;
205 flushout(struct output *dest)
208 if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
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;
231 outfmt(struct output *file, const char *fmt, ...)
236 doformat(file, fmt, ap);
242 out1fmt(const char *fmt, ...)
247 doformat(out1, fmt, ap);
252 dprintf(const char *fmt, ...)
257 doformat(out2, fmt, ap);
263 fmtstr(char *outbuf, int length, const char *fmt, ...)
266 struct output strout;
268 strout.nextc = outbuf;
269 strout.nleft = length;
270 strout.fd = BLOCK_OUT;
273 doformat(&strout, fmt, ap);
276 if (strout.flags & OUTPUT_ERR)
277 outbuf[length - 1] = '\0';
281 doformat_wr(void *cookie, const char *buf, int len)
287 o = (struct output *)cookie;
290 c = (unsigned char)*buf++;
298 doformat(struct output *dest, const char *f, va_list ap)
302 if ((fp = fwopen(dest, doformat_wr)) != NULL) {
309 * Version of write which resumes after a signal is caught.
313 xwrite(int fd, char *buf, int nbytes)
322 i = write(fd, buf, n);
331 } else if (errno != EINTR) {