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/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "strescape.h"
const char *str_nescape(const void *str, size_t len)
{
string_t *dest = t_str_new(len*2);
str_append_escaped(dest, str, len);
return str_c(dest);
}
void str_append_escaped(string_t *dest, const void *src, size_t src_size)
{
const unsigned char *pstart = src, *p = src, *pend = pstart + src_size;
/* see if we need to quote it */
for (; p < pend; p++) {
if (IS_ESCAPED_CHAR(*p))
break;
}
/* quote */
str_append_data(dest, pstart, (size_t)(p - pstart));
for (; p < pend; p++) {
if (IS_ESCAPED_CHAR(*p))
str_append_c(dest, '\\');
str_append_data(dest, p, 1);
}
}
void str_append_unescaped(string_t *dest, const void *src, size_t src_size)
{
const unsigned char *src_c = src;
size_t start = 0, i = 0;
while (i < src_size) {
for (; i < src_size; i++) {
if (src_c[i] == '\\')
break;
}
str_append_data(dest, src_c + start, i-start);
if (i < src_size) {
if (++i == src_size)
break;
str_append_c(dest, src_c[i++]);
}
start = i;
}
}
char *str_unescape(char *str)
{
/* @UNSAFE */
char *dest, *start = str;
while (*str != '\\') {
if (*str == '\0')
return start;
str++;
}
for (dest = str; *str != '\0'; str++) {
if (*str == '\\') {
str++;
if (*str == '\0')
break;
}
*dest++ = *str;
}
*dest = '\0';
return start;
}
int str_unescape_next(const char **str, const char **unescaped_r)
{
const char *p;
char *escaped;
bool esc_found = FALSE;
for (p = *str; *p != '\0'; p++) {
if (*p == '"')
break;
else if (*p == '\\') {
if (p[1] == '\0')
return -1;
esc_found = TRUE;
p++;
}
}
if (*p != '"')
return -1;
escaped = p_strdup_until(unsafe_data_stack_pool, *str, p);
*str = p+1;
*unescaped_r = !esc_found ? escaped : str_unescape(escaped);
return 0;
}
void str_append_tabescaped_n(string_t *dest, const unsigned char *src, size_t src_size)
{
size_t prev_pos = 0;
char esc[2] = { '\001', '\0' };
for (size_t i = 0; i < src_size; i++) {
switch (src[i]) {
case '\000':
esc[1] = '0';
break;
case '\001':
esc[1] = '1';
break;
case '\t':
esc[1] = 't';
break;
case '\r':
esc[1] = 'r';
break;
case '\n':
esc[1] = 'n';
break;
default:
continue;
}
str_append_data(dest, src + prev_pos, i - prev_pos);
str_append_data(dest, esc, 2);
prev_pos = i + 1;
}
str_append_data(dest, src + prev_pos, src_size - prev_pos);
}
void str_append_tabescaped(string_t *dest, const char *src)
{
size_t pos, prev_pos = 0;
char esc[2] = { '\001', '\0' };
for (;;) {
pos = prev_pos + strcspn(src + prev_pos, "\001\t\r\n");
str_append_data(dest, src + prev_pos, pos - prev_pos);
prev_pos = pos + 1;
switch (src[pos]) {
case '\000':
/* end of src string reached */
return;
case '\001':
esc[1] = '1';
break;
case '\t':
esc[1] = 't';
break;
case '\r':
esc[1] = 'r';
break;
case '\n':
esc[1] = 'n';
break;
default:
i_unreached();
}
str_append_data(dest, esc, 2);
}
}
const char *str_tabescape(const char *str)
{
string_t *tmp;
const char *p;
if ((p = strpbrk(str, "\001\t\r\n")) != NULL) {
tmp = t_str_new(128);
str_append_data(tmp, str, p-str);
str_append_tabescaped(tmp, p);
return str_c(tmp);
}
return str;
}
void str_append_tabunescaped(string_t *dest, const void *src, size_t src_size)
{
const unsigned char *src_c = src;
size_t start = 0, i = 0;
while (i < src_size) {
for (; i < src_size; i++) {
if (src_c[i] == '\001')
break;
}
str_append_data(dest, src_c + start, i-start);
if (i < src_size) {
i++;
if (i < src_size) {
switch (src_c[i]) {
case '0':
str_append_c(dest, '\000');
break;
case '1':
str_append_c(dest, '\001');
break;
case 't':
str_append_c(dest, '\t');
break;
case 'r':
str_append_c(dest, '\r');
break;
case 'n':
str_append_c(dest, '\n');
break;
default:
str_append_c(dest, src_c[i]);
break;
}
i++;
}
}
start = i;
}
}
static char *str_tabunescape_from(char *str, char *src)
{
/* @UNSAFE */
char *dest, *p;
dest = src;
for (;;) {
switch (src[1]) {
case '\0':
/* truncated input */
*dest = '\0';
return str;
case '0':
*dest++ = '\000';
break;
case '1':
*dest++ = '\001';
break;
case 't':
*dest++ = '\t';
break;
case 'r':
*dest++ = '\r';
break;
case 'n':
*dest++ = '\n';
break;
default:
*dest++ = src[1];
break;
}
src += 2;
p = strchr(src, '\001');
if (p == NULL) {
memmove(dest, src, strlen(src)+1);
break;
}
size_t copy_len = p - src;
memmove(dest, src, copy_len);
dest += copy_len;
src = p;
}
return str;
}
char *str_tabunescape(char *str)
{
char *src = strchr(str, '\001');
if (src == NULL) {
/* no unescaping needed */
return str;
}
return str_tabunescape_from(str, src);
}
const char *t_str_tabunescape(const char *str)
{
const char *p;
p = strchr(str, '\001');
if (p == NULL)
return str;
char *dest = t_strdup_noconst(str);
return str_tabunescape_from(dest, dest + (p - str));
}
static char **p_strsplit_tabescaped_inplace(pool_t pool, char *data)
{
/* @UNSAFE */
char **array;
unsigned int count, new_alloc_count, alloc_count;
if (*data == '\0')
return p_new(pool, char *, 1);
alloc_count = 32;
array = pool == unsafe_data_stack_pool ?
t_malloc_no0(sizeof(char *) * alloc_count) :
p_malloc(pool, sizeof(char *) * alloc_count);
array[0] = data; count = 1;
char *need_unescape = NULL;
while ((data = strpbrk(data, "\t\001")) != NULL) {
/* separator or escape char found */
if (*data == '\001') {
if (need_unescape == NULL)
need_unescape = data;
data++;
continue;
}
if (count+1 >= alloc_count) {
new_alloc_count = nearest_power(alloc_count+1);
array = p_realloc(pool, array,
sizeof(char *) * alloc_count,
sizeof(char *) *
new_alloc_count);
alloc_count = new_alloc_count;
}
*data++ = '\0';
if (need_unescape != NULL) {
str_tabunescape_from(array[count-1], need_unescape);
need_unescape = NULL;
}
array[count++] = data;
}
if (need_unescape != NULL)
str_tabunescape_from(array[count-1], need_unescape);
i_assert(count < alloc_count);
array[count] = NULL;
return array;
}
const char *const *t_strsplit_tabescaped_inplace(char *data)
{
char *const *escaped =
p_strsplit_tabescaped_inplace(unsafe_data_stack_pool, data);
return (const char *const *)escaped;
}
char **p_strsplit_tabescaped(pool_t pool, const char *str)
{
return p_strsplit_tabescaped_inplace(pool, p_strdup(pool, str));
}
const char *const *t_strsplit_tabescaped(const char *str)
{
return t_strsplit_tabescaped_inplace(t_strdup_noconst(str));
}
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