[PATCH 5/9] utf8.c: add utf8_strnwidth() with the ability to skip ansi sequences
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
utf8.c | 20 ++++++++++++++------
utf8.h | 1 +
2 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/utf8.c b/utf8.c
index 18a4d9c..791499e 100644
--- a/utf8.c
+++ b/utf8.c
@@ -266,18 +266,26 @@ int utf8_width(const char **start, size_t *remainder_p)
* string, assuming that the string is utf8. Returns strlen() instead
* if the string does not look like a valid utf8 string.
*/
-int utf8_strwidth(const char *string)
+int utf8_strnwidth(const char *string, int len, int skip_ansi)
{
int width = 0;
const char *orig = string;
- while (1) {
- if (!string)
- return strlen(orig);
- if (!*string)
- return width;
+ if (len == -1)
+ len = strlen(string);
+ while (string && string < orig + len) {
+ int skip;
+ while (skip_ansi &&
+ (skip = display_mode_esc_sequence_len(string)))
+ string += skip;
width += utf8_width(&string, NULL);
}
+ return string ? width : len;
+}
+
+int utf8_strwidth(const char *string)
+{
+ return utf8_strnwidth(string, -1, 0);
}
int is_utf8(const char *text)
diff --git a/utf8.h b/utf8.h
index 3c0ae76..58d5b6b 100644
--- a/utf8.h
+++ b/utf8.h
@@ -4,6 +4,7 @@
typedef unsigned int ucs_char_t; /* assuming 32bit int */
int utf8_width(const char **start, size_t *remainder_p);
+int utf8_strnwidth(const char *string, int len, int skip_ansi);
int utf8_strwidth(const char *string);
int is_utf8(const char *text);
int is_encoding_utf8(const char *name);
--
1.7.12.1.406.g6ab07c4
Nguyễn Thái Ngọc Duy <pclouds@gmail.com>