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utf8: teach same_encoding() alternative UTF encoding names

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The function same_encoding() could only recognize alternative names for
UTF-8 encodings. Teach it to recognize all kinds of alternative UTF
encoding names (e.g. utf16).

While we are at it, fix a crash that would occur if same_encoding() was
called with a NULL argument and a non-NULL argument.

This function is used in a subsequent commit.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Schneider 2018-04-15 20:16:04 +02:00 committed by Junio C Hamano
parent 66b8af3e12
commit 2f0c4a362c
1 changed files with 24 additions and 2 deletions
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26
utf8.c
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@ -401,18 +401,40 @@ out:
strbuf_release(&sb_dst);
}
/*
* Returns true (1) if the src encoding name matches the dst encoding
* name directly or one of its alternative names. E.g. UTF-16BE is the
* same as UTF16BE.
*/
static int same_utf_encoding(const char *src, const char *dst)
{
if (istarts_with(src, "utf") && istarts_with(dst, "utf")) {
/* src[3] or dst[3] might be '\0' */
int i = (src[3] == '-' ? 4 : 3);
int j = (dst[3] == '-' ? 4 : 3);
return !strcasecmp(src+i, dst+j);
}
return 0;
}
int is_encoding_utf8(const char *name)
{
if (!name)
return 1;
if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
if (same_utf_encoding("utf-8", name))
return 1;
return 0;
}
int same_encoding(const char *src, const char *dst)
{
if (is_encoding_utf8(src) && is_encoding_utf8(dst))
static const char utf8[] = "UTF-8";
if (!src)
src = utf8;
if (!dst)
dst = utf8;
if (same_utf_encoding(src, dst))
return 1;
return !strcasecmp(src, dst);
}