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Diffstat (limited to 'StdLib/LibC/Stdio/fgets.c')
-rw-r--r-- | StdLib/LibC/Stdio/fgets.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/fgets.c b/StdLib/LibC/Stdio/fgets.c new file mode 100644 index 0000000000..cf107ab867 --- /dev/null +++ b/StdLib/LibC/Stdio/fgets.c @@ -0,0 +1,119 @@ +/** @file
+ Implementation of fgets as declared in <stdio.h>.
+
+ Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License that accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+ 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:
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ - 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.
+ - 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
+
+ NetBSD: fgets.c,v 1.20 2003/12/14 23:56:28 lukem Exp
+ fgets.c 8.2 (Berkeley) 12/22/93
+**/
+#include <LibConfig.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include "reentrant.h"
+#include "local.h"
+
+/*
+ * Read at most n-1 characters from the given file.
+ * Stop when a newline has been read, or the count runs out.
+ * Return first argument, or NULL if no characters were read.
+ */
+char *
+fgets(char *buf, int n, FILE *fp)
+{
+ size_t len;
+ char *s;
+ unsigned char *p, *t;
+
+ _DIAGASSERT(buf != NULL);
+ _DIAGASSERT(fp != NULL);
+ if (n <= 0) /* sanity check */
+ return (NULL);
+
+ FLOCKFILE(fp);
+ _SET_ORIENTATION(fp, -1);
+ s = buf;
+ n--; /* leave space for NUL */
+ while (n != 0) {
+ /*
+ * If the buffer is empty, refill it.
+ */
+ if (fp->_r <= 0) {
+ if (__srefill(fp)) {
+ /* EOF/error: stop with partial or no line */
+ if (s == buf) {
+ FUNLOCKFILE(fp);
+ return (NULL);
+ }
+ break;
+ }
+ }
+ len = fp->_r;
+ p = fp->_p;
+
+ /*
+ * Scan through at most n bytes of the current buffer,
+ * looking for '\n'. If found, copy up to and including
+ * newline, and stop. Otherwise, copy entire chunk
+ * and loop.
+ */
+ if (len > (size_t)n)
+ len = n;
+ t = memchr((void *)p, '\n', len);
+ if (t != NULL) {
+ len = ++t - p;
+ fp->_r -= (int)len;
+ fp->_p = t;
+ (void)memcpy((void *)s, (void *)p, len);
+ s[len] = 0;
+ FUNLOCKFILE(fp);
+ return (buf);
+ }
+ fp->_r -= (int)len;
+ fp->_p += len;
+ (void)memcpy((void *)s, (void *)p, len);
+ s += len;
+ n -= (int)len;
+ }
+ *s = 0;
+ FUNLOCKFILE(fp);
+ return (buf);
+}
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