[ccan] [PATCH 08/11] bytestring: Split bytestrings by a set of character delimiters
David Gibson
david at gibson.dropbear.id.au
Sun Oct 12 03:43:33 AEDT 2014
This introduces the functions bytestring_splitchrs_first() and
bytestring_splitchrs_next() which can be used to iterate through substrings
of a bytestring separated by any of a given set of delimiter characters.
Signed-off-by: David Gibson <david at gibson.dropbear.id.au>
---
ccan/bytestring/bytestring.c | 38 ++++++++++++++++++++++++++++++++++++++
ccan/bytestring/bytestring.h | 30 ++++++++++++++++++++++++++++++
ccan/bytestring/test/run.c | 35 ++++++++++++++++++++++++++++++++++-
3 files changed, 102 insertions(+), 1 deletion(-)
diff --git a/ccan/bytestring/bytestring.c b/ccan/bytestring/bytestring.c
index 45c1297..7f5f46a 100644
--- a/ccan/bytestring/bytestring.c
+++ b/ccan/bytestring/bytestring.c
@@ -66,3 +66,41 @@ struct bytestring bytestring_splitchr_next(struct bytestring whole,
return _splitchr(whole, delim, (prev.ptr - whole.ptr) + prev.len + 1);
}
+
+static struct bytestring _splitchrs(struct bytestring whole,
+ struct bytestring delim, size_t start)
+{
+ struct bytestring remainder;
+ size_t n;
+
+ assert(start <= whole.len);
+
+ remainder = bytestring_slice(whole, start, whole.len);
+ n = bytestring_cspn(remainder, delim);
+ return bytestring_slice(whole, start, start + n);
+}
+
+struct bytestring bytestring_splitchrs_first(struct bytestring whole,
+ struct bytestring delim)
+{
+ if (whole.len == 0)
+ return bytestring_NULL;
+
+ return _splitchrs(whole, delim, 0);
+}
+
+struct bytestring bytestring_splitchrs_next(struct bytestring whole,
+ struct bytestring delim,
+ struct bytestring prev)
+{
+ if (!prev.ptr)
+ return bytestring_NULL;
+
+ /* prev has to be a substring of whole */
+ assert(prev.ptr >= whole.ptr);
+
+ if ((prev.ptr + prev.len) == (whole.ptr + whole.len))
+ return bytestring_NULL;
+
+ return _splitchrs(whole, delim, (prev.ptr - whole.ptr) + prev.len + 1);
+}
diff --git a/ccan/bytestring/bytestring.h b/ccan/bytestring/bytestring.h
index 98d7edb..a444d3d 100644
--- a/ccan/bytestring/bytestring.h
+++ b/ccan/bytestring/bytestring.h
@@ -227,4 +227,34 @@ struct bytestring bytestring_splitchr_next(struct bytestring whole,
(_s).ptr; \
(_s) = bytestring_splitchr_next((_w), (_delim), (_s)))
+/**
+ * bytestring_splitchrs_first - split a bytestring on a set of delimiter
+ * characters
+ * @whole: a bytestring
+ * @delim: delimiter characters
+ *
+ * Returns the first substring of @whole delimited by any character in
+ * @delim.
+ */
+struct bytestring bytestring_splitchrs_first(struct bytestring whole,
+ struct bytestring delim);
+
+/**
+ * bytestring_splitchr_next - split a bytestring on a set of delimiter
+ * characters
+ * @whole: a bytestring
+ * @delim: delimiter character
+ * @prev: last substring
+ *
+ * Returns the next @delim delimited substring of @whole after @prev.
+ */
+struct bytestring bytestring_splitchrs_next(struct bytestring whole,
+ struct bytestring delim,
+ struct bytestring prev);
+
+#define bytestring_foreach_splitchrs(_s, _w, _delim) \
+ for ((_s) = bytestring_splitchrs_first((_w), (_delim)); \
+ (_s).ptr; \
+ (_s) = bytestring_splitchrs_next((_w), (_delim), (_s)))
+
#endif /* CCAN_BYTESTRING_H_ */
diff --git a/ccan/bytestring/test/run.c b/ccan/bytestring/test/run.c
index 74406c1..b40c1f8 100644
--- a/ccan/bytestring/test/run.c
+++ b/ccan/bytestring/test/run.c
@@ -17,7 +17,7 @@ int main(void)
int n;
/* This is how many tests you plan to run */
- plan_tests(82);
+ plan_tests(102);
bs = bytestring(str1, sizeof(str1) - 1);
ok1(bs.ptr == str1);
@@ -157,6 +157,39 @@ int main(void)
}
ok1(n == 4);
+ bs7 = bytestring_splitchrs_first(bs, BYTESTRING(" \0"));
+ ok1(bs7.ptr == bs.ptr);
+ ok1(bytestring_eq(bs7, BYTESTRING("test")));
+ bs7 = bytestring_splitchrs_next(bs, BYTESTRING(" \0"), bs7);
+ ok1(bs7.ptr == bs.ptr + 5);
+ ok1(bytestring_eq(bs7, BYTESTRING("string")));
+ bs7 = bytestring_splitchrs_next(bs, BYTESTRING(" \0"), bs7);
+ ok1(!bs7.ptr);
+ bs7 = bytestring_splitchrs_next(bs, BYTESTRING(" \0"), bs7);
+ ok1(!bs7.ptr);
+
+ bs7 = bytestring_splitchrs_first(bs2, BYTESTRING(" \0"));
+ ok1(bs7.ptr == bs2.ptr);
+ ok1(bytestring_eq(bs7, BYTESTRING("abc")));
+ bs7 = bytestring_splitchrs_next(bs2, BYTESTRING(" \0"), bs7);
+ ok1(bs7.ptr == bs2.ptr + 4);
+ ok1(bytestring_eq(bs7, BYTESTRING("def")));
+ bs7 = bytestring_splitchrs_next(bs2, BYTESTRING(" \0"), bs7);
+ ok1(!bs7.ptr);
+ bs7 = bytestring_splitchrs_next(bs2, BYTESTRING(" \0"), bs7);
+ ok1(!bs7.ptr);
+
+ bs7 = bytestring_splitchrs_first(BYTESTRING(""), BYTESTRING(" \0"));
+ ok1(!bs7.ptr);
+
+ n = 0;
+ bytestring_foreach_splitchrs(bs7, BYTESTRING(" \0 \0 "),
+ BYTESTRING("\0 ")) {
+ n++;
+ ok1(bs7.ptr && !bs7.len);
+ }
+ ok1(n == 6);
+
/* This exits depending on whether all tests passed */
return exit_status();
}
--
1.9.3
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