diff options
Diffstat (limited to 'src/output.c')
| -rw-r--r-- | src/output.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/src/output.c b/src/output.c new file mode 100644 index 0000000..84bcfa3 --- /dev/null +++ b/src/output.c @@ -0,0 +1,397 @@ +/* $NetBSD: output.c,v 1.27 2002/11/24 22:35:42 christos Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)output.c 8.2 (Berkeley) 5/4/95"; +#else +__RCSID("$NetBSD: output.c,v 1.27 2002/11/24 22:35:42 christos Exp $"); +#endif +#endif /* not lint */ + +/* + * Shell output routines. We use our own output routines because: + * When a builtin command is interrupted we have to discard + * any pending output. + * When a builtin command appears in back quotes, we want to + * save the output of the command in a region obtained + * via malloc, rather than doing a fork and reading the + * output of the command via a pipe. + * Our output routines may be smaller than the stdio routines. + */ + +#include <sys/types.h> /* quad_t */ +#include <sys/param.h> /* BSD4_4 */ +#include <sys/ioctl.h> + +#include <stdio.h> /* defines BUFSIZ */ +#include <string.h> +#include <unistd.h> +#include <stdlib.h> +#ifdef USE_GLIBC_STDIO +#include <fcntl.h> +#endif +#include <limits.h> + +#include "shell.h" +#include "syntax.h" +#include "output.h" +#include "memalloc.h" +#include "error.h" +#include "main.h" + + +#define OUTBUFSIZ BUFSIZ +#define MEM_OUT -3 /* output to dynamically allocated memory */ + + +#ifdef USE_GLIBC_STDIO +struct output output = { + stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 1, flags: 0 +}; +struct output errout = { + stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 2, flags: 0 +} +#ifdef notyet +struct output memout = { + stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: MEM_OUT, flags: 0 +}; +#endif +#else +struct output output = { + nextc: 0, end: 0, buf: 0, bufsize: OUTBUFSIZ, fd: 1, flags: 0 +}; +struct output errout = { + nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 2, flags: 0 +}; +struct output preverrout; +#ifdef notyet +struct output memout = { + nextc: 0, end: 0, buf: 0, bufsize: 0, fd: MEM_OUT, flags: 0 +}; +#endif +#endif +struct output *out1 = &output; +struct output *out2 = &errout; + + +#ifndef USE_GLIBC_STDIO +static void __outstr(const char *, size_t, struct output *); +#endif +static int xvsnprintf(char *, size_t, const char *, va_list); + + +#ifdef mkinit + +INCLUDE "output.h" +INCLUDE "memalloc.h" + +INIT { +#ifdef USE_GLIBC_STDIO + initstreams(); +#endif +} + +RESET { +#ifdef notyet + out1 = &output; + out2 = &errout; +#ifdef USE_GLIBC_STDIO + if (memout.stream != NULL) + __closememout(); +#endif + if (memout.buf != NULL) { + ckfree(memout.buf); + memout.buf = NULL; + } +#endif +} + +#endif + + +#ifndef USE_GLIBC_STDIO +static void +__outstr(const char *p, size_t len, struct output *dest) +{ + size_t bufsize; + size_t offset; + size_t nleft; + + nleft = dest->end - dest->nextc; + if (nleft >= len) { +buffered: + dest->nextc = mempcpy(dest->nextc, p, len); + return; + } + + bufsize = dest->bufsize; + if (!bufsize) { + ; + } else if (dest->buf == NULL) { + if (dest->fd == MEM_OUT && len > bufsize) { + bufsize = len; + } + offset = 0; + goto alloc; + } else if (dest->fd == MEM_OUT) { + offset = bufsize; + if (bufsize >= len) { + bufsize <<= 1; + } else { + bufsize += len; + } + if (bufsize < offset) + goto err; +alloc: + INTOFF; + dest->buf = ckrealloc(dest->buf, bufsize); + dest->bufsize = bufsize; + dest->end = dest->buf + bufsize; + dest->nextc = dest->buf + offset; + INTON; + } else { + flushout(dest); + } + + nleft = dest->end - dest->nextc; + if (nleft > len) + goto buffered; + + if ((xwrite(dest->fd, p, len))) { +err: + dest->flags |= OUTPUT_ERR; + } +} +#endif + + +void +outstr(const char *p, struct output *file) +{ +#ifdef USE_GLIBC_STDIO + INTOFF; + fputs(p, file->stream); + INTON; +#else + size_t len; + + len = strlen(p); + __outstr(p, len, file); +#endif +} + + +#ifndef USE_GLIBC_STDIO + + +void +outcslow(int c, struct output *dest) +{ + char buf = c; + __outstr(&buf, 1, dest); +} +#endif + + +void +flushall(void) +{ + flushout(&output); +#ifdef FLUSHERR + flushout(&errout); +#endif +} + + +void +flushout(struct output *dest) +{ +#ifdef USE_GLIBC_STDIO + INTOFF; + fflush(dest->stream); + INTON; +#else + size_t len; + + len = dest->nextc - dest->buf; + if (!len || dest->fd < 0) + return; + dest->nextc = dest->buf; + if ((xwrite(dest->fd, dest->buf, len))) + dest->flags |= OUTPUT_ERR; +#endif +} + + +void +outfmt(struct output *file, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + doformat(file, fmt, ap); + va_end(ap); +} + + +void +out1fmt(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + doformat(out1, fmt, ap); + va_end(ap); +} + + +int +fmtstr(char *outbuf, size_t length, const char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = xvsnprintf(outbuf, length, fmt, ap); + va_end(ap); + return ret; +} + + +#ifndef USE_GLIBC_STDIO +void +doformat(struct output *dest, const char *f, va_list ap) +{ + struct stackmark smark; + char *s; + int len, ret; + size_t size; + va_list ap2; + + va_copy(ap2, ap); + size = dest->end - dest->nextc; + len = xvsnprintf(dest->nextc, size, f, ap2); + va_end(ap2); + if (len < 0) { + dest->flags |= OUTPUT_ERR; + return; + } + if (len < size) { + dest->nextc += len; + return; + } + setstackmark(&smark); + s = stalloc((len >= stackblocksize() ? len : stackblocksize()) + 1); + ret = xvsnprintf(s, len + 1, f, ap); + if (ret == len) + __outstr(s, len, dest); + else + dest->flags |= OUTPUT_ERR; + popstackmark(&smark); +} +#endif + + + +/* + * Version of write which resumes after a signal is caught. + */ + +int +xwrite(int fd, const void *p, size_t n) +{ + const char *buf = p; + + while (n) { + ssize_t i; + size_t m; + + m = n; + if (m > SSIZE_MAX) + m = SSIZE_MAX; + do { + i = write(fd, buf, m); + } while (i < 0 && errno == EINTR); + if (i < 0) + return -1; + buf += i; + n -= i; + } + return 0; +} + + +#ifdef notyet +#ifdef USE_GLIBC_STDIO +void initstreams() { + output.stream = stdout; + errout.stream = stderr; +} + + +void +openmemout(void) { + INTOFF; + memout.stream = open_memstream(&memout.buf, &memout.bufsize); + INTON; +} + + +int +__closememout(void) { + int error; + error = fclose(memout.stream); + memout.stream = NULL; + return error; +} +#endif +#endif + + +static int +xvsnprintf(char *outbuf, size_t length, const char *fmt, va_list ap) +{ + int ret; + + INTOFF; + ret = vsnprintf(outbuf, length, fmt, ap); + INTON; + return ret; +} |