Function

GLibstrncasecmp

deprecated: 2.2

Declaration

gint
g_strncasecmp (
  const gchar* s1,
  const gchar* s2,
  guint n
)

Description

A case-insensitive string comparison, corresponding to the standard strncasecmp() function on platforms which support it. It is similar to g_strcasecmp() except it only compares the first n characters of the strings.

Deprecated since: 2.2

The problem with g_strncasecmp() is that it does the comparison by calling toupper()/tolower(). These functions are locale-specific and operate on single bytes. However, it is impossible to handle things correctly from an internationalization standpoint by operating on bytes, since characters may be multibyte. Thus g_strncasecmp() is broken if your string is guaranteed to be ASCII, since it is locale-sensitive, and it’s broken if your string is localized, since it doesn’t work on many encodings at all, including UTF-8, EUC-JP, etc.

There are therefore two replacement techniques: g_ascii_strncasecmp(),
which only works on ASCII and is not locale-sensitive, and
`g_utf8_casefold()` followed by `strcmp()` on the resulting strings,
which is good for case-insensitive sorting of UTF-8.

Parameters

s1

Type: const gchar*

A string.

The data is owned by the caller of the function.

The value is a NUL terminated UTF-8 string.

s2

Type: const gchar*

A string to compare with s1

The data is owned by the caller of the function.

The value is a NUL terminated UTF-8 string.

n

Type: guint

The maximum number of characters to compare.

Return value

Type: gint

0 if the strings match, a negative value if s1 < s2, or a positive value if s1 > s2.