From c1c0685e34db538d7a9186bc9cb46b104cd9fd49 Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Fri, 13 Feb 2004 14:43:35 +0000
Subject: [PATCH] split_words()

---
 lib/misc/lvm-string.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 lib/misc/lvm-string.h |  2 ++
 2 files changed, 45 insertions(+)

diff --git a/lib/misc/lvm-string.c b/lib/misc/lvm-string.c
index 253a35fc6..a16a76221 100644
--- a/lib/misc/lvm-string.c
+++ b/lib/misc/lvm-string.c
@@ -8,6 +8,8 @@
 #include "lvm-types.h"
 #include "lvm-string.h"
 
+#include <ctype.h>
+
 /*
  * On error, up to glibc 2.0.6, snprintf returned -1 if buffer was too small;
  * From glibc 2.1 it returns number of chars (excl. trailing null) that would 
@@ -46,3 +48,44 @@ int emit_to_buffer(char **buffer, size_t *size, const char *fmt, ...)
 	*size -= n;
 	return 1;
 }
+
+/*
+ * consume characters while they match the predicate function.
+ */
+static char *_consume(char *buffer, int (*fn) (int))
+{
+	while (*buffer && fn(*buffer))
+		buffer++;
+
+	return buffer;
+}
+
+static int _isword(int c)
+{
+	return !isspace(c);
+}
+
+/*
+ * Split buffer into NULL-separated words in argv.
+ * Returns number of words.
+ */
+int split_words(char *buffer, unsigned max, char **argv)
+{
+	unsigned arg;
+
+	for (arg = 0; arg < max; arg++) {
+		buffer = _consume(buffer, isspace);
+		if (!*buffer)
+			break;
+
+		argv[arg] = buffer;
+		buffer = _consume(buffer, _isword);
+
+		if (*buffer) {
+			*buffer = '\0';
+			buffer++;
+		}
+	}
+
+	return arg;
+}
diff --git a/lib/misc/lvm-string.h b/lib/misc/lvm-string.h
index 6e26f389c..c20efd3df 100644
--- a/lib/misc/lvm-string.h
+++ b/lib/misc/lvm-string.h
@@ -21,4 +21,6 @@ int lvm_snprintf(char *buf, size_t bufsize, const char *format, ...);
 
 int emit_to_buffer(char **buffer, size_t *size, const char *fmt, ...);
 
+int split_words(char *buffer, unsigned max, char **argv);
+
 #endif