diff options
Diffstat (limited to 'StdLib/LibC/Stdio/findfp.c')
| -rw-r--r-- | StdLib/LibC/Stdio/findfp.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/findfp.c b/StdLib/LibC/Stdio/findfp.c new file mode 100644 index 0000000000..b6495c3bcb --- /dev/null +++ b/StdLib/LibC/Stdio/findfp.c @@ -0,0 +1,211 @@ +/* $NetBSD: findfp.c,v 1.23 2006/10/07 21:40:46 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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. 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 <LibConfig.h>
+#include <sys/EfiCdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)findfp.c 8.2 (Berkeley) 1/4/94";
+#else
+__RCSID("$NetBSD: findfp.c,v 1.23 2006/10/07 21:40:46 thorpej Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <sys/EfiSysCall.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include "reentrant.h"
+#include "local.h"
+#include "glue.h"
+#include <MainData.h>
+
+int __sdidinit;
+
+#define NDYNAMIC 10 /* add ten more whenever necessary */
+
+#define std(flags, file) \
+/* p r w flags file bf lfbsize cookie close */ \
+ { NULL, 0, 0, flags, file, { NULL, 0 }, 0, __sF + file, __sclose, \
+/* read seek write ext up */ \
+ __sread, __sseek, __swrite, { (void *)(__sFext + file), 0 }, NULL, \
+/* ur ubuf, nbuf lb blksize offset */ \
+ 0, { '\0', '\0', '\0' }, { '\0' }, { NULL, 0 }, 0, (fpos_t)0 }
+
+ /* the usual - (stdin + stdout + stderr) */
+static FILE usual[FOPEN_MAX - 3];
+static struct __sfileext usualext[FOPEN_MAX - 3];
+static struct glue uglue = { 0, FOPEN_MAX - 3, usual };
+
+#if defined(_REENTRANT) && !defined(__lint__) /* XXX lint is busted */
+#define STDEXT { ._lock = MUTEX_INITIALIZER, ._lockcond = COND_INITIALIZER }
+struct __sfileext __sFext[3] = { STDEXT,
+ STDEXT,
+ STDEXT};
+#else
+struct __sfileext __sFext[3];
+#endif
+
+FILE __sF[3] = {
+ std(__SRD, STDIN_FILENO), /* stdin */
+ std(__SWR, STDOUT_FILENO), /* stdout */
+ std(__SWR|__SNBF, STDERR_FILENO) /* stderr */
+};
+struct glue __sglue = { &uglue, 3, __sF };
+
+static struct glue *moreglue(int);
+void f_prealloc(void);
+
+#ifdef _REENTRANT
+rwlock_t __sfp_lock = RWLOCK_INITIALIZER;
+#endif
+
+static struct glue *
+moreglue(int n)
+{
+ struct glue *g;
+ FILE *p;
+ struct __sfileext *pext;
+ static FILE empty;
+
+ g = (struct glue *)malloc(sizeof(*g) + ALIGNBYTES + n * sizeof(FILE)
+ + n * sizeof(struct __sfileext));
+ if (g == NULL)
+ return (NULL);
+ p = (FILE *)ALIGN((g + 1));
+ g->next = NULL;
+ g->niobs = n;
+ g->iobs = p;
+ pext = (void *)(p + n);
+ while (--n >= 0) {
+ *p = empty;
+ _FILEEXT_SETUP(p, pext);
+ p++;
+ pext++;
+ }
+ return (g);
+}
+
+/*
+ * Find a free FILE for fopen et al.
+ */
+FILE *
+__sfp()
+{
+ FILE *fp;
+ int n;
+ struct glue *g;
+
+ if (!__sdidinit)
+ __sinit();
+
+ rwlock_wrlock(&__sfp_lock);
+ for (g = &__sglue;; g = g->next) {
+ for (fp = g->iobs, n = g->niobs; --n >= 0; fp++)
+ if (fp->_flags == 0)
+ goto found;
+ if (g->next == NULL && (g->next = moreglue(NDYNAMIC)) == NULL)
+ break;
+ }
+ rwlock_unlock(&__sfp_lock);
+ return (NULL);
+found:
+ fp->_flags = 1; /* reserve this slot; caller sets real flags */
+ fp->_p = NULL; /* no current pointer */
+ fp->_w = 0; /* nothing to read or write */
+ fp->_r = 0;
+ fp->_bf._base = NULL; /* no buffer */
+ fp->_bf._size = 0;
+ fp->_lbfsize = 0; /* not line buffered */
+ fp->_file = -1; /* no file */
+/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
+ _UB(fp)._base = NULL; /* no ungetc buffer */
+ _UB(fp)._size = 0;
+ fp->_lb._base = NULL; /* no line buffer */
+ fp->_lb._size = 0;
+ memset(WCIO_GET(fp), 0, sizeof(struct wchar_io_data));
+ rwlock_unlock(&__sfp_lock);
+ return (fp);
+}
+
+#if 0
+/*
+ * XXX. Force immediate allocation of internal memory. Not used by stdio,
+ * but documented historically for certain applications. Bad applications.
+ */
+void
+f_prealloc()
+{
+ struct glue *g;
+ int n;
+
+ n = (int)sysconf(_SC_OPEN_MAX) - FOPEN_MAX + 20; /* 20 for slop. */
+ for (g = &__sglue; (n -= g->niobs) > 0 && g->next; g = g->next)
+ /* void */;
+ if (n > 0)
+ g->next = moreglue(n);
+}
+#endif
+
+/*
+ * exit() calls _cleanup() through *gMD->cleanup, set whenever we
+ * open or buffer a file. This chicanery is done so that programs
+ * that do not use stdio need not link it all in.
+ *
+ * The name `_cleanup' is, alas, fairly well known outside stdio.
+ */
+void
+_cleanup( void )
+{
+ /* (void) _fwalk(fclose); */
+ (void) fflush(NULL); /* `cheating' */
+}
+
+/*
+ * __sinit() is called whenever stdio's internal variables must be set up.
+ */
+void
+__sinit( void )
+{
+ int i;
+
+ for (i = 0; i < FOPEN_MAX - 3; i++)
+ _FILEEXT_SETUP(&usual[i], &usualext[i]);
+
+ /* make sure we clean up on exit */
+ gMD->cleanup = _cleanup; /* conservative */
+ __sdidinit = 1;
+}
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