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Add scm_c_put_escaped_char, scm_c_can_put_char

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* libguile/ports.h:
* libguile/ports.c (scm_c_put_escaped_char, scm_c_can_put_char): New
  helpers.
This commit is contained in:
Andy Wingo 2016-05-30 18:48:09 +02:00
parent 934b6dc398
commit 2affb9accf
2 changed files with 50 additions and 1 deletions
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49
libguile/ports.c
View file

@ -2937,6 +2937,14 @@ encode_escape_sequence (scm_t_wchar ch, scm_t_uint8 buf[ESCAPE_BUFFER_SIZE])
return i;
}
void
scm_c_put_escaped_char (SCM port, scm_t_wchar ch)
{
scm_t_uint8 escape[ESCAPE_BUFFER_SIZE];
size_t len = encode_escape_sequence (ch, escape);
scm_c_put_latin1_chars (port, escape, len);
}
/* Convert CODEPOINT to UTF-8 and store the result in UTF8. Return the
number of bytes of the UTF-8-encoded string. */
static size_t
@ -3277,6 +3285,45 @@ scm_c_put_char (SCM port, scm_t_wchar ch)
}
}
/* Return 0 unless the port can be written out to the port's encoding
without errors, substitutions, or escapes. */
int
scm_c_can_put_char (SCM port, scm_t_wchar ch)
{
SCM encoding = SCM_PORT (port)->encoding;
if (scm_is_eq (encoding, sym_UTF_8)
|| (scm_is_eq (encoding, sym_ISO_8859_1) && ch <= 0xff)
|| scm_is_eq (encoding, sym_UTF_16)
|| scm_is_eq (encoding, sym_UTF_16LE)
|| scm_is_eq (encoding, sym_UTF_16BE)
|| scm_is_eq (encoding, sym_UTF_32)
|| scm_is_eq (encoding, sym_UTF_32LE)
|| scm_is_eq (encoding, sym_UTF_32BE))
return 1;
{
SCM bv = scm_port_buffer_bytevector (scm_port_auxiliary_write_buffer (port));
scm_t_uint8 buf[UTF8_BUFFER_SIZE];
char *input = (char *) buf;
size_t input_len;
char *output = (char *) SCM_BYTEVECTOR_CONTENTS (bv);
size_t output_len = SCM_BYTEVECTOR_LENGTH (bv);
size_t result;
iconv_t output_cd;
input_len = codepoint_to_utf8 (ch, buf);
scm_port_acquire_iconv_descriptors (port, NULL, &output_cd);
iconv (output_cd, NULL, NULL, &output, &output_len);
result = iconv (output_cd, &input, &input_len, &output, &output_len);
iconv (output_cd, NULL, NULL, &output, &output_len);
scm_port_release_iconv_descriptors (port);
return result != (size_t) -1;
}
}
void
scm_c_put_string (SCM port, SCM string, size_t start, size_t count)
{
@ -3361,7 +3408,7 @@ scm_lfwrite_substr (SCM str, size_t start, size_t end, SCM port)
if (end == (size_t) -1)
end = scm_i_string_length (str);
scm_i_display_substring (str, start, end, port);
scm_c_put_string (port, str, start, end - start);
}

2
libguile/ports.h
View file

@ -220,6 +220,8 @@ SCM_API void scm_c_put_utf32_chars (SCM port, const scm_t_uint32 *buf,
SCM_API void scm_c_put_string (SCM port, SCM str, size_t start, size_t count);
SCM_API SCM scm_put_string (SCM port, SCM str, SCM start, SCM count);
SCM_API void scm_c_put_char (SCM port, scm_t_wchar ch);
SCM_INTERNAL void scm_c_put_escaped_char (SCM port, scm_t_wchar ch);
SCM_INTERNAL int scm_c_can_put_char (SCM port, scm_t_wchar ch);
SCM_API void scm_putc (char c, SCM port);
SCM_API void scm_puts (const char *str_data, SCM port);
SCM_API void scm_lfwrite (const char *ptr, size_t size, SCM port);