+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
- stdio replacement
- Copyright (C) Andrew Tridgell 2001
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/*
- stdio is very convenient, but on some systems the file descriptor
- in FILE* is 8 bits, so it fails when more than 255 files are open.
-
- XFILE replaces stdio. It is less efficient, but at least it works
- when you have lots of files open
-
- The main restriction on XFILE is that it doesn't support seeking,
- and doesn't support O_RDWR. That keeps the code simple.
-*/
-
-#include "includes.h"
-
-#define XBUFSIZE BUFSIZ
-
-static XFILE _x_stdin = { 0, NULL, NULL, XBUFSIZE, 0, O_RDONLY, X_IOFBF, 0 };
-static XFILE _x_stdout = { 1, NULL, NULL, XBUFSIZE, 0, O_WRONLY, X_IOLBF, 0 };
-static XFILE _x_stderr = { 2, NULL, NULL, 0, 0, O_WRONLY, X_IONBF, 0 };
-
-XFILE *x_stdin = &_x_stdin;
-XFILE *x_stdout = &_x_stdout;
-XFILE *x_stderr = &_x_stderr;
-
-#define X_FLAG_EOF 1
-#define X_FLAG_ERROR 2
-#define X_FLAG_EINVAL 3
-
-/* simulate setvbuf() */
-int x_setvbuf(XFILE *f, char *buf, int mode, size_t size)
-{
- if (x_fflush(f) != 0) return -1;
- if (f->bufused) return -1;
-
- /* on files being read full buffering is the only option */
- if ((f->open_flags & O_ACCMODE) == O_RDONLY) {
- mode = X_IOFBF;
- }
-
- /* destroy any earlier buffer */
- SAFE_FREE(f->buf);
- f->buf = 0;
- f->bufsize = 0;
- f->next = NULL;
- f->bufused = 0;
- f->buftype = mode;
-
- if (f->buftype == X_IONBF) return 0;
-
- /* if buffering then we need some size */
- if (size == 0) size = XBUFSIZE;
-
- f->bufsize = size;
- f->bufused = 0;
-
- return 0;
-}
-
-/* allocate the buffer */
-static int x_allocate_buffer(XFILE *f)
-{
- if (f->buf) return 1;
- if (f->bufsize == 0) return 0;
- f->buf = (char *)SMB_MALLOC(f->bufsize);
- if (!f->buf) return 0;
- f->next = f->buf;
- return 1;
-}
-
-
-/* this looks more like open() than fopen(), but that is quite deliberate.
- I want programmers to *think* about O_EXCL, O_CREAT etc not just
- get them magically added
-*/
-XFILE *x_fopen(const char *fname, int flags, mode_t mode)
-{
- XFILE *ret;
-
- ret = SMB_MALLOC_P(XFILE);
- if (!ret) {
- return NULL;
- }
-
- memset(ret, 0, sizeof(XFILE));
-
- if ((flags & O_ACCMODE) == O_RDWR) {
- /* we don't support RDWR in XFILE - use file
- descriptors instead */
- SAFE_FREE(ret);
- errno = EINVAL;
- return NULL;
- }
-
- ret->open_flags = flags;
-
- ret->fd = sys_open(fname, flags, mode);
- if (ret->fd == -1) {
- SAFE_FREE(ret);
- return NULL;
- }
-
- x_setvbuf(ret, NULL, X_IOFBF, XBUFSIZE);
-
- return ret;
-}
-
-XFILE *x_fdup(const XFILE *f)
-{
- XFILE *ret;
- int fd;
-
- fd = dup(x_fileno(f));
- if (fd < 0) {
- return NULL;
- }
-
- ret = SMB_CALLOC_ARRAY(XFILE, 1);
- if (!ret) {
- close(fd);
- return NULL;
- }
-
- ret->fd = fd;
- ret->open_flags = f->open_flags;
- x_setvbuf(ret, NULL, X_IOFBF, XBUFSIZE);
- return ret;
-}
-
-/* simulate fclose() */
-int x_fclose(XFILE *f)
-{
- int ret;
-
- /* make sure we flush any buffered data */
- (void)x_fflush(f);
-
- ret = close(f->fd);
- f->fd = -1;
- if (f->buf) {
- /* make sure data can't leak into a later malloc */
- memset(f->buf, 0, f->bufsize);
- SAFE_FREE(f->buf);
- }
- /* check the file descriptor given to the function is NOT one of the static
- * descriptor of this libreary or we will free unallocated memory
- * --sss */
- if (f != x_stdin && f != x_stdout && f != x_stderr) {
- SAFE_FREE(f);
- }
- return ret;
-}
-
-/* simulate fwrite() */
-size_t x_fwrite(const void *p, size_t size, size_t nmemb, XFILE *f)
-{
- ssize_t ret;
- size_t total=0;
-
- /* we might be writing unbuffered */
- if (f->buftype == X_IONBF ||
- (!f->buf && !x_allocate_buffer(f))) {
- ret = write(f->fd, p, size*nmemb);
- if (ret == -1) return -1;
- return ret/size;
- }
-
-
- while (total < size*nmemb) {
- size_t n = f->bufsize - f->bufused;
- n = MIN(n, (size*nmemb)-total);
-
- if (n == 0) {
- /* it's full, flush it */
- if (x_fflush(f) != 0) {
- return -1;
- }
- continue;
- }
-
- memcpy(f->buf + f->bufused, total+(const char *)p, n);
- f->bufused += n;
- total += n;
- }
-
- /* when line buffered we need to flush at the last linefeed. This can
- flush a bit more than necessary, but that is harmless */
- if (f->buftype == X_IOLBF && f->bufused) {
- int i;
- for (i=(size*nmemb)-1; i>=0; i--) {
- if (*(i+(const char *)p) == '\n') {
- if (x_fflush(f) != 0) {
- return -1;
- }
- break;
- }
- }
- }
-
- return total/size;
-}
-
-/* thank goodness for asprintf() */
- int x_vfprintf(XFILE *f, const char *format, va_list ap)
-{
- char *p;
- int len, ret;
- va_list ap2;
-
- VA_COPY(ap2, ap);
-
- len = vasprintf(&p, format, ap2);
- if (len <= 0) {
- va_end(ap2);
- return len;
- }
- ret = x_fwrite(p, 1, len, f);
- SAFE_FREE(p);
-
- va_end(ap2);
-
- return ret;
-}
-
- int x_fprintf(XFILE *f, const char *format, ...)
-{
- va_list ap;
- int ret;
-
- va_start(ap, format);
- ret = x_vfprintf(f, format, ap);
- va_end(ap);
- return ret;
-}
-
-/* at least fileno() is simple! */
-int x_fileno(const XFILE *f)
-{
- return f->fd;
-}
-
-/* simulate fflush() */
-int x_fflush(XFILE *f)
-{
- int ret;
-
- if (f->flags & X_FLAG_ERROR) return -1;
-
- if (f->bufused == 0 || !f->buf) return 0;
-
- if ((f->open_flags & O_ACCMODE) != O_WRONLY) {
- errno = EINVAL;
- return -1;
- }
-
- ret = write(f->fd, f->buf, f->bufused);
- if (ret == -1) return -1;
-
- f->bufused -= ret;
- if (f->bufused > 0) {
- f->flags |= X_FLAG_ERROR;
- memmove(f->buf, ret + (char *)f->buf, f->bufused);
- return -1;
- }
-
- return 0;
-}
-
-/* simulate setbuffer() */
-void x_setbuffer(XFILE *f, char *buf, size_t size)
-{
- x_setvbuf(f, buf, buf?X_IOFBF:X_IONBF, size);
-}
-
-/* simulate setbuf() */
-void x_setbuf(XFILE *f, char *buf)
-{
- x_setvbuf(f, buf, buf?X_IOFBF:X_IONBF, XBUFSIZE);
-}
-
-/* simulate setlinebuf() */
-void x_setlinebuf(XFILE *f)
-{
- x_setvbuf(f, NULL, X_IOLBF, 0);
-}
-
-
-/* simulate feof() */
-int x_feof(XFILE *f)
-{
- if (f->flags & X_FLAG_EOF) return 1;
- return 0;
-}
-
-/* simulate ferror() */
-int x_ferror(XFILE *f)
-{
- if (f->flags & X_FLAG_ERROR) return 1;
- return 0;
-}
-
-/* fill the read buffer */
-static void x_fillbuf(XFILE *f)
-{
- int n;
-
- if (f->bufused) return;
-
- if (!f->buf && !x_allocate_buffer(f)) return;
-
- n = read(f->fd, f->buf, f->bufsize);
- if (n <= 0) return;
- f->bufused = n;
- f->next = f->buf;
-}
-
-/* simulate fgetc() */
-int x_fgetc(XFILE *f)
-{
- int ret;
-
- if (f->flags & (X_FLAG_EOF | X_FLAG_ERROR)) return EOF;
-
- if (f->bufused == 0) x_fillbuf(f);
-
- if (f->bufused == 0) {
- f->flags |= X_FLAG_EOF;
- return EOF;
- }
-
- ret = *(unsigned char *)(f->next);
- f->next++;
- f->bufused--;
- return ret;
-}
-
-/* simulate fread */
-size_t x_fread(void *p, size_t size, size_t nmemb, XFILE *f)
-{
- size_t total = 0;
- while (total < size*nmemb) {
- int c = x_fgetc(f);
- if (c == EOF) break;
- (total+(char *)p)[0] = (char)c;
- total++;
- }
- return total/size;
-}
-
-/* simulate fgets() */
-char *x_fgets(char *s, int size, XFILE *stream)
-{
- char *s0 = s;
- int l = size;
- while (l>1) {
- int c = x_fgetc(stream);
- if (c == EOF) break;
- *s++ = (char)c;
- l--;
- if (c == '\n') break;
- }
- if (l==size || x_ferror(stream)) {
- return 0;
- }
- *s = 0;
- return s0;
-}
-
-/* trivial seek, works only for SEEK_SET and SEEK_END if SEEK_CUR is
- * set then an error is returned */
-off_t x_tseek(XFILE *f, off_t offset, int whence)
-{
- if (f->flags & X_FLAG_ERROR)
- return -1;
-
- /* only SEEK_SET and SEEK_END are supported */
- /* SEEK_CUR needs internal offset counter */
- if (whence != SEEK_SET && whence != SEEK_END) {
- f->flags |= X_FLAG_EINVAL;
- errno = EINVAL;
- return -1;
- }
-
- /* empty the buffer */
- switch (f->open_flags & O_ACCMODE) {
- case O_RDONLY:
- f->bufused = 0;
- break;
- case O_WRONLY:
- if (x_fflush(f) != 0)
- return -1;
- break;
- default:
- errno = EINVAL;
- return -1;
- }
-
- f->flags &= ~X_FLAG_EOF;
- return (off_t)sys_lseek(f->fd, offset, whence);
-}
git.samba.org / martins / samba.git / commitdiff