--- /dev/null
+/* $NetBSD: fgetstr.c,v 1.4 2006/11/24 19:46:58 christos Exp $ */\r
+\r
+/*-\r
+ * Copyright (c) 1990, 1993\r
+ * The Regents of the University of California. All rights reserved.\r
+ *\r
+ * This code is derived from software contributed to Berkeley by\r
+ * Chris Torek.\r
+ *\r
+ * Redistribution and use in source and binary forms, with or without\r
+ * modification, are permitted provided that the following conditions\r
+ * are met:\r
+ * 1. Redistributions of source code must retain the above copyright\r
+ * notice, this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright\r
+ * notice, this list of conditions and the following disclaimer in the\r
+ * documentation and/or other materials provided with the distribution.\r
+ * 3. Neither the name of the University nor the names of its contributors\r
+ * may be used to endorse or promote products derived from this software\r
+ * without specific prior written permission.\r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
+ * SUCH DAMAGE.\r
+ */\r
+#include <LibConfig.h>\r
+#include <sys/EfiCdefs.h>\r
+#if defined(LIBC_SCCS) && !defined(lint)\r
+#if 0\r
+static char sccsid[] = "@(#)fgetline.c 8.1 (Berkeley) 6/4/93";\r
+#else\r
+__RCSID("$NetBSD: fgetstr.c,v 1.4 2006/11/24 19:46:58 christos Exp $");\r
+#endif\r
+#endif /* LIBC_SCCS and not lint */\r
+\r
+#include "namespace.h"\r
+\r
+#include <assert.h>\r
+#include <stdio.h>\r
+#include <stdlib.h>\r
+#include <string.h>\r
+#include "reentrant.h"\r
+#include "local.h"\r
+\r
+/*\r
+ * Expand the line buffer. Return -1 on error.\r
+#ifdef notdef\r
+ * The `new size' does not account for a terminating '\0',\r
+ * so we add 1 here.\r
+#endif\r
+ */\r
+int\r
+__slbexpand(FILE *fp, size_t newsize)\r
+{\r
+ void *p;\r
+\r
+#ifdef notdef\r
+ ++newsize;\r
+#endif\r
+ _DIAGASSERT(fp != NULL);\r
+\r
+ if ((size_t)fp->_lb._size >= newsize)\r
+ return (0);\r
+ if ((p = realloc(fp->_lb._base, newsize)) == NULL)\r
+ return (-1);\r
+ fp->_lb._base = p;\r
+ fp->_lb._size = (int)newsize;\r
+ return (0);\r
+}\r
+\r
+/*\r
+ * Get an input line. The returned pointer often (but not always)\r
+ * points into a stdio buffer. Fgetline does not alter the text of\r
+ * the returned line (which is thus not a C string because it will\r
+ * not necessarily end with '\0'), but does allow callers to modify\r
+ * it if they wish. Thus, we set __SMOD in case the caller does.\r
+ */\r
+char *\r
+__fgetstr(FILE *fp, size_t *lenp, int sep)\r
+{\r
+ unsigned char *p;\r
+ size_t len;\r
+ size_t off;\r
+\r
+ _DIAGASSERT(fp != NULL);\r
+ _DIAGASSERT(lenp != NULL);\r
+\r
+ /* make sure there is input */\r
+ if (fp->_r <= 0 && __srefill(fp)) {\r
+ *lenp = 0;\r
+ return (NULL);\r
+ }\r
+\r
+ /* look for a newline in the input */\r
+ if ((p = memchr((void *)fp->_p, sep, (size_t)fp->_r)) != NULL) {\r
+ char *ret;\r
+\r
+ /*\r
+ * Found one. Flag buffer as modified to keep fseek from\r
+ * `optimising' a backward seek, in case the user stomps on\r
+ * the text.\r
+ */\r
+ p++; /* advance over it */\r
+ ret = (char *)fp->_p;\r
+ *lenp = len = p - fp->_p;\r
+ fp->_flags |= __SMOD;\r
+ fp->_r -= (int)len;\r
+ fp->_p = p;\r
+ return (ret);\r
+ }\r
+\r
+ /*\r
+ * We have to copy the current buffered data to the line buffer.\r
+ * As a bonus, though, we can leave off the __SMOD.\r
+ *\r
+ * OPTIMISTIC is length that we (optimistically) expect will\r
+ * accommodate the `rest' of the string, on each trip through the\r
+ * loop below.\r
+ */\r
+#define OPTIMISTIC 80\r
+\r
+ for (len = fp->_r, off = 0;; len += fp->_r) {\r
+ size_t diff;\r
+\r
+ /*\r
+ * Make sure there is room for more bytes. Copy data from\r
+ * file buffer to line buffer, refill file and look for\r
+ * newline. The loop stops only when we find a newline.\r
+ */\r
+ if (__slbexpand(fp, len + OPTIMISTIC))\r
+ goto error;\r
+ (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p,\r
+ len - off);\r
+ off = len;\r
+ if (__srefill(fp))\r
+ break; /* EOF or error: return partial line */\r
+ if ((p = memchr((void *)fp->_p, sep, (size_t)fp->_r)) == NULL)\r
+ continue;\r
+\r
+ /* got it: finish up the line (like code above) */\r
+ p++;\r
+ diff = p - fp->_p;\r
+ len += diff;\r
+ if (__slbexpand(fp, len))\r
+ goto error;\r
+ (void)memcpy((void *)(fp->_lb._base + off), (void *)fp->_p,\r
+ diff);\r
+ fp->_r -= (int)diff;\r
+ fp->_p = p;\r
+ break;\r
+ }\r
+ *lenp = len;\r
+#ifdef notdef\r
+ fp->_lb._base[len] = 0;\r
+#endif\r
+ return ((char *)fp->_lb._base);\r
+\r
+error:\r
+ *lenp = 0; /* ??? */\r
+ return (NULL); /* ??? */\r
+}\r
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