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/* $Id: headers.c 9024 2010-03-21 16:49:30Z iulius $
**
** Routines for headers: manipulation and checks.
*/
#include "config.h"
#include "clibrary.h"
#include <ctype.h>
#include "inn/libinn.h"
/*
** We currently only check the requirements for RFC 3977:
**
** o The name [of a header] consists of one or more printable
** US-ASCII characters other than colon.
*/
bool
IsValidHeaderName(const char *string)
{
const unsigned char *p;
/* Not NULL. */
if (string == NULL)
return false;
p = (const unsigned char *) string;
/* Not empty. */
if (*p == '\0')
return false;
for (; *p != '\0'; p++) {
/* Contains only printable US-ASCII characters other
* than colon. */
if (!isgraph((unsigned char) *p) || *p == ':')
return false;
}
return true;
}
/*
** Skip any amount of CFWS (comments and folding whitespace), the RFC 5322
** grammar term for whitespace, CRLF pairs, and possibly nested comments that
** may contain escaped parens. We also allow simple newlines since we don't
** always deal with wire-format messages. Note that we do not attempt to
** ensure that CRLF or a newline is followed by whitespace. Returns the new
** position of the pointer.
*/
const char *
skip_cfws(const char *p)
{
int nesting = 0;
for (; *p != '\0'; p++) {
switch (*p) {
case ' ':
case '\t':
case '\n':
break;
case '\r':
if (p[1] != '\n' && nesting == 0)
return p;
break;
case '(':
nesting++;
break;
case ')':
if (nesting == 0)
return p;
nesting--;
break;
case '\\':
if (nesting == 0 || p[1] == '\0')
return p;
p++;
break;
default:
if (nesting == 0)
return p;
break;
}
}
return p;
}
/*
** Skip any amount of FWS (folding whitespace), the RFC 5322 grammar term
** for whitespace and CRLF pairs. We also allow simple newlines since we don't
** always deal with wire-format messages. Note that we do not attempt to
** ensure that CRLF or a newline is followed by whitespace. Returns the new
** position of the pointer.
*/
const char *
skip_fws(const char *p)
{
for (; *p != '\0'; p++) {
switch (*p) {
case ' ':
case '\t':
case '\n':
break;
case '\r':
if (p[1] != '\n')
return p;
break;
default:
return p;
}
}
return p;
}
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