[PATCH] utf8: add utf8_strwidth()

[Geoffrey Thomas <geofft@MIT.EDU>]

From: Geoffrey Thomas <geofft@mit.edu>
I'm about to use this pattern more than once, so make it a common function.

Signed-off-by: Geoffrey Thomas <geofft@mit.edu>
---
 utf8.c |   12 ++++++++++++
 utf8.h |    1 +
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/utf8.c b/utf8.c
index dc37353..a2d888d 100644
--- a/utf8.c
+++ b/utf8.c
@@ -246,6 +246,18 @@ int utf8_width(const char **start, size_t *remainder_p)
 	return git_wcwidth(ch);
 }
 
+/*
+ * Returns the total number of columns required by a null-terminated
+ * string.
+ */
+size_t utf8_strwidth(const char *string)
+{
+	size_t width = 0;
+	while (string && *string)
+		width += utf8_width(&string, NULL);
+	return width;
+}
+
 int is_utf8(const char *text)
 {
 	while (*text) {
diff --git a/utf8.h b/utf8.h
index 98cce1b..1ae3450 100644
--- a/utf8.h
+++ b/utf8.h
@@ -5,6 +5,7 @@ typedef unsigned int ucs_char_t;  /* assuming 32bit int */
 
 ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p);
 int utf8_width(const char **start, size_t *remainder_p);
+size_t utf8_strwidth(const char *string);
 int is_utf8(const char *text);
 int is_encoding_utf8(const char *name);
 
-- 
1.5.6.5