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/* Copyright (c) 2004-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "unichar.h"
#include "str.h"
#include "str-sanitize.h"
static size_t str_sanitize_skip_start(const char *src, size_t max_bytes)
{
unichar_t chr;
size_t i;
for (i = 0; i < max_bytes && src[i] != '\0'; ) {
int len = uni_utf8_get_char_n(src+i, max_bytes-i, &chr);
if (len <= 0)
break;
if ((unsigned char)src[i] < 32)
break;
i += len;
}
i_assert(i <= max_bytes);
return i;
}
static size_t
str_sanitize_skip_start_utf8(const char *src, uintmax_t max_chars)
{
unichar_t chr;
uintmax_t c;
size_t i;
for (i = 0, c = 0; c < max_chars && src[i] != '\0'; ) {
int len = uni_utf8_get_char(src+i, &chr);
if (len <= 0)
break;
if ((unsigned char)src[i] < 32)
break;
c++;
i += len;
}
i_assert(c <= max_chars);
return i;
}
static void str_sanitize_truncate_char(string_t *dest, unsigned int initial_pos)
{
const unsigned char *data = str_data(dest);
size_t len = str_len(dest);
i_assert(len >= initial_pos);
if (len == initial_pos)
return;
data += initial_pos;
len -= initial_pos;
str_truncate(dest, initial_pos +
uni_utf8_data_truncate(data, len, len-1));
}
void str_sanitize_append(string_t *dest, const char *src, size_t max_bytes)
{
size_t initial_pos = str_len(dest);
unichar_t chr;
size_t i;
for (i = 0; i < max_bytes && src[i] != '\0'; ) {
int len = uni_utf8_get_char_n(src+i, max_bytes-i, &chr);
if (len == 0)
break; /* input ended too early */
if (len < 0) {
/* invalid UTF-8 */
str_append_c(dest, '?');
i++;
continue;
}
if ((unsigned char)src[i] < 32)
str_append_c(dest, '?');
else
str_append_data(dest, src+i, len);
i += len;
}
if (src[i] != '\0') {
if (max_bytes < 3)
str_truncate(dest, initial_pos);
else {
while (str_len(dest) - initial_pos > max_bytes-3)
str_sanitize_truncate_char(dest, initial_pos);
}
str_append(dest, "...");
}
}
void str_sanitize_append_utf8(string_t *dest, const char *src,
uintmax_t max_cps)
{
size_t last_pos = 0;
unichar_t chr;
uintmax_t c;
size_t i;
i_assert(max_cps > 0);
for (i = 0, c = 0; c < max_cps && src[i] != '\0'; ) {
int len = uni_utf8_get_char(src+i, &chr);
if (len == 0)
break; /* input ended too early */
last_pos = str_len(dest);
if (len < 0) {
/* invalid UTF-8 */
str_append(dest, UNICODE_REPLACEMENT_CHAR_UTF8);
i++;
continue;
}
if ((unsigned char)src[i] < 32)
str_append(dest, UNICODE_REPLACEMENT_CHAR_UTF8);
else
str_append_data(dest, src+i, len);
i += len;
c++;
}
if (src[i] != '\0') {
str_truncate(dest, last_pos);
str_append(dest, UNICODE_HORIZONTAL_ELLIPSIS_CHAR_UTF8);
}
}
const char *str_sanitize(const char *src, size_t max_bytes)
{
string_t *str;
size_t i;
if (src == NULL)
return NULL;
i = str_sanitize_skip_start(src, max_bytes);
if (src[i] == '\0')
return src;
str = t_str_new(I_MIN(max_bytes, 256));
str_sanitize_append(str, src, max_bytes);
return str_c(str);
}
const char *str_sanitize_utf8(const char *src, uintmax_t max_cps)
{
string_t *str;
size_t i;
if (src == NULL)
return NULL;
i = str_sanitize_skip_start_utf8(src, max_cps);
if (src[i] == '\0')
return src;
str = t_str_new(I_MIN(max_cps, 256));
str_sanitize_append_utf8(str, src, max_cps);
return str_c(str);
}
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