Add port/ replacement for strsep()

from OpenBSD, similar to strlcat, strlcpy

There are currently no uses, but some will be added soon.

Reviewed-by: Kyotaro Horiguchi <[email protected]>
Reviewed-by: David Steele <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/[email protected]

2 files changed, 78 insertions, 0 deletions

diff --git a/src/port/meson.build b/src/port/meson.build
index fd9ee199d1b..ff54b7b53e9 100644
--- a/src/port/meson.build
+++ b/src/port/meson.build
@@ -70,6 +70,7 @@ replace_funcs_neg = [
   ['strlcat'],
   ['strlcpy'],
   ['strnlen'],
+  ['strsep'],
 ]
 
 if host_system != 'windows'
diff --git a/src/port/strsep.c b/src/port/strsep.c
new file mode 100644
index 00000000000..564125c5101
--- /dev/null
+++ b/src/port/strsep.c
@@ -0,0 +1,77 @@
+/*
+ * src/port/strsep.c
+ *
+ *	$OpenBSD: strsep.c,v 1.8 2015/08/31 02:53:57 guenther Exp $	*/
+
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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 "c.h"
+
+/*
+ * Get next token from string *stringp, where tokens are possibly-empty
+ * strings separated by characters from delim.
+ *
+ * Writes NULs into the string at *stringp to end tokens.
+ * delim need not remain constant from call to call.
+ * On return, *stringp points past the last NUL written (if there might
+ * be further tokens), or is NULL (if there are definitely no more tokens).
+ *
+ * If *stringp is NULL, strsep returns NULL.
+ */
+char *
+strsep(char **stringp, const char *delim)
+{
+	char	   *s;
+	const char *spanp;
+	int			c,
+				sc;
+	char	   *tok;
+
+	if ((s = *stringp) == NULL)
+		return (NULL);
+	for (tok = s;;)
+	{
+		c = *s++;
+		spanp = delim;
+		do
+		{
+			if ((sc = *spanp++) == c)
+			{
+				if (c == 0)
+					s = NULL;
+				else
+					s[-1] = 0;
+				*stringp = s;
+				return (tok);
+			}
+		} while (sc != 0);
+	}
+	/* NOTREACHED */
+}