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more efficient scm_to_utf8_stringn, scm_to_utf32_stringn

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* libguile/strings.c (scm_to_utf8_stringn): More efficient
  implementation than calling scm_to_stringn.
  (scm_to_utf32_stringn): Likewise.
This commit is contained in:
Andy Wingo 2012-02-09 23:14:11 +01:00
parent e7cf0457d7
commit e3d4597469
1 changed files with 52 additions and 4 deletions
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56
libguile/strings.c
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@ -1844,10 +1844,47 @@ scm_to_utf8_string (SCM str)
return scm_to_utf8_stringn (str, NULL);
}
static size_t
latin1_u8_strlen (const scm_t_uint8 *str, size_t len)
{
size_t ret, i;
for (i = 0, ret = 0; i < len; i++)
ret += (str[i] < 128) ? 1 : 2;
return ret;
}
static scm_t_uint8*
latin1_to_u8 (const scm_t_uint8 *str, size_t latin_len,
scm_t_uint8 *u8_result, size_t *u8_lenp)
{
size_t i, n;
size_t u8_len = latin1_u8_strlen (str, latin_len);
if (!(u8_result && u8_lenp && *u8_lenp > u8_len))
u8_result = scm_malloc (u8_len + 1);
if (u8_lenp)
*u8_lenp = u8_len;
for (i = 0, n = 0; i < latin_len; i++)
n += u8_uctomb (u8_result + n, str[i], u8_len - n);
if (n != u8_len)
abort ();
u8_result[n] = 0;
return u8_result;
}
char *
scm_to_utf8_stringn (SCM str, size_t *lenp)
{
return scm_to_stringn (str, lenp, "UTF-8", SCM_FAILED_CONVERSION_ERROR);
if (scm_i_is_narrow_string (str))
return (char *) latin1_to_u8 ((scm_t_uint8 *) scm_i_string_chars (str),
scm_i_string_length (str),
NULL, lenp);
else
return (char *) u32_to_u8 ((scm_t_uint32*)scm_i_string_wide_chars (str),
scm_i_string_length (str),
NULL, lenp);
}
scm_t_wchar *
@ -1865,9 +1902,20 @@ scm_to_utf32_stringn (SCM str, size_t *lenp)
SCM_VALIDATE_STRING (1, str);
if (scm_i_is_narrow_string (str))
result = (scm_t_wchar *)
scm_to_stringn (str, lenp, "UTF-32",
SCM_FAILED_CONVERSION_ERROR);
{
scm_t_uint8 *codepoints;
size_t i, len;
codepoints = (scm_t_uint8*) scm_i_string_chars (str);
len = scm_i_string_length (str);
if (lenp)
*lenp = len;
result = scm_malloc ((len + 1) * sizeof (scm_t_wchar));
for (i = 0; i < len; i++)
result[i] = codepoints[i];
result[len] = 0;
}
else
{
size_t len;