[PATCH] Add some useful functions for strbuf manipulation.

["Lukas Sandström" <lukass@etek.chalmers.se>]

Signed-off-by: Lukas Sandström <lukass@etek.chalmers.se>
---

Junio C Hamano wrote:
> Heh, after getting burned by that NUL thingy, I was waiting for somebody
> to step up.  Thanks.

Here we go then. Two freshly baked patches.

Note that this is a pretty straight buffers -> strbuf's conversion,
but I think it will be a good start for further hardening of mailinfo.


 strbuf.c |   70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 strbuf.h |    6 +++++
 2 files changed, 76 insertions(+), 0 deletions(-)

diff --git a/strbuf.c b/strbuf.c
index 4aed752..28d6776 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -60,6 +60,18 @@ void strbuf_grow(struct strbuf *sb, size_t extra)
 	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
 }
 
+void strbuf_trim(struct strbuf *sb)
+{
+	char *b = sb->buf;
+	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
+		sb->len--;
+	while(sb->len > 0 && isspace(*b)) {
+		b++;
+		sb->len--;
+	}
+	memmove(sb->buf, b, sb->len);
+	sb->buf[sb->len] = '\0';
+}
 void strbuf_rtrim(struct strbuf *sb)
 {
 	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
@@ -67,6 +79,64 @@ void strbuf_rtrim(struct strbuf *sb)
 	sb->buf[sb->len] = '\0';
 }
 
+void strbuf_ltrim(struct strbuf *sb)
+{
+	char *b = sb->buf;
+	while(sb->len > 0 && isspace(*b)) {
+		b++;
+		sb->len--;
+	}
+	memmove(sb->buf, b, sb->len);
+	sb->buf[sb->len] = '\0';
+}
+
+void strbuf_tolower(struct strbuf *sb)
+{
+	int i;
+	for (i = 0; i < sb->len; i++)
+		sb->buf[i] = tolower(sb->buf[i]);
+}
+
+struct strbuf ** strbuf_split(struct strbuf *sb, int delim)
+{
+	int alloc = 2, pos = 0;
+	char *n, *p;
+	struct strbuf **ret;
+	struct strbuf *t;
+
+	ret = xcalloc(alloc, sizeof(struct strbuf *));
+	p = n = sb->buf;
+	while (n < sb->buf + sb->len) {
+		int len;
+		n = memchr(n, delim, sb->len - (n - sb->buf));
+		if (pos + 1 >= alloc) {
+			alloc = alloc * 2;
+			ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
+		}
+		if (!n)
+			n = sb->buf + sb->len - 1;
+		len = n - p + 1;
+		t = xmalloc(sizeof(struct strbuf));
+		strbuf_init(t, len);
+		strbuf_add(t, p, len);
+		ret[pos] = t;
+		ret[++pos] = NULL;
+		p = ++n;
+	}
+	return ret;
+}
+
+void strbuf_list_free(struct strbuf ** sbs)
+{
+	struct strbuf **s = sbs;
+
+	while(*s) {
+		strbuf_release(*s);
+		free(*s++);
+	}
+	free(sbs);
+}
+
 int strbuf_cmp(struct strbuf *a, struct strbuf *b)
 {
 	int cmp;
diff --git a/strbuf.h b/strbuf.h
index faec229..577d14e 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -77,8 +77,14 @@ static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
 #define strbuf_reset(sb)  strbuf_setlen(sb, 0)
 
 /*----- content related -----*/
+extern void strbuf_trim(struct strbuf *);
 extern void strbuf_rtrim(struct strbuf *);
+extern void strbuf_ltrim(struct strbuf *);
 extern int strbuf_cmp(struct strbuf *, struct strbuf *);
+extern void strbuf_tolower(struct strbuf *);
+
+extern struct strbuf ** strbuf_split(struct strbuf*, int delim);
+extern void strbuf_list_free(struct strbuf **);
 
 /*----- add data in your buffer -----*/
 static inline void strbuf_addch(struct strbuf *sb, int c) {
-- 
1.5.4.5