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/*
** Copyright 2001-2011 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "rfc822hdr.h"
/*
** Read the next mail header.
*/
int rfc822hdr_read(struct rfc822hdr *h, FILE *f, off_t *pos, off_t epos)
{
size_t n=0;
int c;
for (;;)
{
if ( n >= h->hdrsize)
{
size_t hn=h->hdrsize + 1024;
char *p= h->header ? realloc(h->header, hn):
malloc(hn);
if (!p)
return (-1);
h->header=p;
h->hdrsize=hn;
}
if (pos && *pos >= epos)
{
h->header[n]=0;
break;
}
c=getc(f);
if (c == EOF)
{
if (pos)
*pos=epos;
h->header[n]=0;
break;
}
if (pos)
++*pos;
h->header[n]=c;
if (c == '\n')
{
if (n == 0)
{
if (pos)
*pos=epos;
h->header[n]=0;
break;
}
c=getc(f);
if (c != EOF)
ungetc(c, f);
if (c == '\n' || c == '\r' ||
!isspace((int)(unsigned char)c))
{
h->header[n]=0;
break;
}
}
n++;
if (h->maxsize && n + 2 > h->maxsize)
--n;
}
if (n == 0)
{
if (pos)
*pos=epos;
h->value=h->header;
return (1);
}
for (h->value=h->header; *h->value; ++h->value)
{
if (*h->value == ':')
{
*h->value++=0;
while (*h->value &&
isspace((int)(unsigned char)*h->value))
++h->value;
break;
}
}
return (0);
}
void rfc822hdr_fixname(struct rfc822hdr *h)
{
char *p;
for (p=h->header; *p; p++)
{
*p=tolower((int)(unsigned char)*p);
}
}
void rfc822hdr_collapse(struct rfc822hdr *h)
{
char *p, *q;
for (p=q=h->value; *p; )
{
if (*p == '\n')
{
while (*p && isspace((int)(unsigned char)*p))
++p;
*q++=' ';
continue;
}
*q++ = *p++;
}
*q=0;
}
/* This is, basically, a case-insensitive US-ASCII comparison function */
#define lc(x) ((x) >= 'A' && (x) <= 'Z' ? (x) + ('a'-'A'):(x))
int rfc822hdr_namecmp(const char *a, const char *b)
{
int rc;
while ((rc=(int)(unsigned char)lc(*a) - (int)(unsigned char)lc(*b))==0)
{
if (!*a)
return 0;
++a;
++b;
}
return rc;
}
int rfc822hdr_is_addr(const char *hdr)
{
return rfc822hdr_namecmp(hdr, "from") == 0 ||
rfc822hdr_namecmp(hdr, "to") == 0 ||
rfc822hdr_namecmp(hdr, "cc") == 0 ||
rfc822hdr_namecmp(hdr, "bcc") == 0 ||
rfc822hdr_namecmp(hdr, "resent-from") == 0 ||
rfc822hdr_namecmp(hdr, "resent-to") == 0 ||
rfc822hdr_namecmp(hdr, "resent-cc") == 0 ||
rfc822hdr_namecmp(hdr, "resent-bcc") == 0;
}
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