static TOKEN
append_to_token( TOKEN old, const char *buf, size_t length )
{
size_t n = strlen(old->data);
TOKEN t;
t = xmalloc( sizeof *t + n + length );
t->next = old->next;
t->type = old->type;
memcpy( t->data, old->data, n );
memcpy( t->data+n, buf, length );
t->data[n+length] = 0;
old->next = NULL;
release_token_list(old);
return t;
}
void
rfc822parse_release_field (rfc822parse_field_t ctx)
{
if (ctx)
release_token_list (ctx);
}
/*
Parse a field into tokens as defined by rfc822.
*/
static TOKEN
parse_field (HDR_LINE hdr)
{
static const char specials[] = "<>@.,;:\\[]\"()";
static const char specials2[] = "<>@.,;:";
static const char tspecials[] = "/?=<>@,;:\\[]\"()";
static const char tspecials2[] = "/?=<>@.,;:"; /* FIXME: really
include '.'?*/
static struct
{
const unsigned char *name;
size_t namelen;
} tspecial_header[] = {
{ "Content-Type", 12},
{ "Content-Transfer-Encoding", 25},
{ "Content-Disposition", 19},
{ NULL, 0}
};
const char *delimiters;
const char *delimiters2;
const unsigned char *line, *s, *s2;
size_t n;
int i, invalid = 0;
TOKEN t, tok, *tok_tail;
errno = 0;
if (!hdr)
return NULL;
tok = NULL;
tok_tail = &tok;
line = hdr->line;
if (!(s = strchr (line, ':')))
return NULL; /* oops */
n = s - line;
if (!n)
return NULL; /* oops: invalid name */
delimiters = specials;
delimiters2 = specials2;
for (i = 0; tspecial_header[i].name; i++)
{
if (n == tspecial_header[i].namelen
&& !memcmp (line, tspecial_header[i].name, n))
{
delimiters = tspecials;
delimiters2 = tspecials2;
break;
}
}
s++; /* Move over the colon. */
for (;;)
{
while (!*s)
{
if (!hdr->next || !hdr->next->cont)
return tok; /* Ready. */
/* Next item is a header continuation line. */
hdr = hdr->next;
s = hdr->line;
}
if (*s == '(')
{
int level = 1;
int in_quote = 0;
invalid = 0;
for (s++;; s++)
{
while (!*s)
{
if (!hdr->next || !hdr->next->cont)
goto oparen_out;
/* Next item is a header continuation line. */
hdr = hdr->next;
s = hdr->line;
}
if (in_quote)
{
if (*s == '\"')
in_quote = 0;
else if (*s == '\\' && s[1]) /* what about continuation? */
s++;
}
else if (*s == ')')
{
if (!--level)
break;
}
else if (*s == '(')
level++;
else if (*s == '\"')
in_quote = 1;
}
oparen_out:
if (!*s)
; /* Actually this is an error, but we don't care about it. */
else
s++;
}
else if (*s == '\"' || *s == '[')
{
/* We do not check for non-allowed nesting of domainliterals */
int term = *s == '\"' ? '\"' : ']';
invalid = 0;
s++;
t = NULL;
for (;;)
{
for (s2 = s; *s2; s2++)
{
if (*s2 == term)
break;
else if (*s2 == '\\' && s2[1]) /* what about continuation? */
s2++;
}
t = (t
? append_to_token (t, s, s2 - s)
: new_token (term == '\"'? tQUOTED : tDOMAINLIT, s, s2 - s));
if (!t)
goto failure;
if (*s2 || !hdr->next || !hdr->next->cont)
break;
/* Next item is a header continuation line. */
hdr = hdr->next;
s = hdr->line;
}
*tok_tail = t;
tok_tail = &t->next;
s = s2;
if (*s)
s++; /* skip the delimiter */
}
else if ((s2 = strchr (delimiters2, *s)))
{ /* Special characters which are not handled above. */
invalid = 0;
t = new_token (tSPECIAL, s, 1);
if (!t)
goto failure;
*tok_tail = t;
tok_tail = &t->next;
s++;
}
else if (*s == ' ' || *s == '\t' || *s == '\r' || *s == '\n')
{
invalid = 0;
s = skip_ws (s + 1);
}
else if (*s > 0x20 && !(*s & 128))
{ /* Atom. */
invalid = 0;
for (s2 = s + 1; *s2 > 0x20
&& !(*s2 & 128) && !strchr (delimiters, *s2); s2++)
;
t = new_token (tATOM, s, s2 - s);
if (!t)
goto failure;
*tok_tail = t;
tok_tail = &t->next;
s = s2;
}
else
{ /* Invalid character. */
if (!invalid)
{ /* For parsing we assume only one space. */
t = new_token (tSPACE, NULL, 0);
if (!t)
goto failure;
*tok_tail = t;
tok_tail = &t->next;
invalid = 1;
}
s++;
}
}
/*NOTREACHED*/
failure:
{
int save = errno;
release_token_list (tok);
errno = save;
}
return NULL;
}
void
rfc822_release_parse_ctx( RFC822_PARSE_CTX ctx )
{
if( ctx )
release_token_list( ctx );
}
