2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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19 * may be used to endorse or promote products derived from this software
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22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)fgets.c 8.2 (Berkeley) 12/22/93";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "namespace.h"
45 #include "un-namespace.h"
47 #include "libc_private.h"
50 * Read at most n-1 characters from the given file.
51 * Stop when a newline has been read, or the count runs out.
52 * Return first argument, or NULL if no characters were read.
55 fgets(char * __restrict buf, int n, FILE * __restrict fp)
61 FLOCKFILE_CANCELSAFE(fp);
64 if (n <= 0) { /* sanity check */
72 n--; /* leave space for NUL */
75 * If the buffer is empty, refill it.
77 if ((len = fp->_r) <= 0) {
79 /* EOF/error: stop with partial or no line */
80 if (!__sfeof(fp) || s == buf) {
91 * Scan through at most n bytes of the current buffer,
92 * looking for '\n'. If found, copy up to and including
93 * newline, and stop. Otherwise, copy entire chunk
98 t = memchr((void *)p, '\n', len);
103 (void)memcpy((void *)s, (void *)p, len);
110 (void)memcpy((void *)s, (void *)p, len);
117 FUNLOCKFILE_CANCELSAFE();