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utf8: add utf8_strwidth() 

I'm about to use this pattern more than once, so make it a common function.

Signed-off-by: Geoffrey Thomas <geofft@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Geoffrey Thomas 2009-01-30 04:41:28 -05:00 committed by Junio C Hamano
parent b296e8fce6
commit 8a9391e944
2 changed files with 20 additions and 0 deletions
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19
utf8.c
View File

@ -246,6 +246,25 @@ 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, 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 width = 0;
const char *orig = string;
while (1) {
if (!string)
return strlen(orig);
if (!*string)
return width;
width += utf8_width(&string, NULL);
}
}
int is_utf8(const char *text)
{
while (*text) {

1
utf8.h
View File

@ -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);
int utf8_strwidth(const char *string);
int is_utf8(const char *text);
int is_encoding_utf8(const char *name);