1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*++
/* NAME
/* is_header 3
/* SUMMARY
/* message header classification
/* SYNOPSIS
/* #include <is_header.h>
/*
/* int is_header(string)
/* const char *string;
/* DESCRIPTION
/* is_header() examines the given string and returns non-zero (true)
/* when it begins with a mail header name + colon. This routine
/* permits 8-bit data in header labels.
/* STANDARDS
/* RFC 822 (ARPA Internet Text Messages)
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include "sys_defs.h"
#include <ctype.h>
/* Global library. */
#include "is_header.h"
/* is_header - determine if this can be a header line */
int is_header(const char *str)
{
const char *cp;
int c;
for (cp = str; (c = *(unsigned char *) cp) != 0; cp++) {
if (c == ':')
return (cp > str);
if ( /* !ISASCII(c) || */ ISSPACE(c) || ISCNTRL(c))
break;
}
return (0);
}
|
