1 # include <stdio.h>
2 # include <ctype.h>
3 # include <errno.h>
4 # include "sendmail.h"
5 
6 static char	SccsId[] = "@(#)headers.c	3.1	08/09/81";
7 
8 /*
9 **  CHOMPHEADER -- process and save a header line.
10 **
11 **	Called by collect and by readcf to deal with header lines.
12 **
13 **	Parameters:
14 **		line -- header as a text line.
15 **		def -- if set, this is a default value.
16 **
17 **	Returns:
18 **		flags for this header.
19 **
20 **	Side Effects:
21 **		The header is saved on the header list.
22 */
23 
24 chompheader(line, def)
25 	char *line;
26 	bool def;
27 {
28 	register char *p;
29 	register HDR *h;
30 	HDR **hp;
31 	extern bool isheader();
32 	char *fname;
33 	char *fvalue;
34 	struct hdrinfo *hi;
35 
36 	/* strip off trailing newline */
37 	p = rindex(line, '\n');
38 	if (p != NULL)
39 		*p = '\0';
40 
41 	/* find canonical name */
42 	fname = line;
43 	p = index(line, ':');
44 	fvalue = &p[1];
45 	while (isspace(*--p))
46 		continue;
47 	*++p = '\0';
48 	makelower(fname);
49 
50 	/* strip field value on front */
51 	if (*fvalue == ' ')
52 		fvalue++;
53 
54 	/* search header list for this header */
55 	for (hp = &Header, h = Header; h != NULL; hp = &h->h_link, h = h->h_link)
56 	{
57 		if (strcmp(fname, h->h_field) == 0 && bitset(H_DEFAULT, h->h_flags))
58 			break;
59 	}
60 
61 	/* see if it is a known type */
62 	for (hi = HdrInfo; hi->hi_field != NULL; hi++)
63 	{
64 		if (strcmp(hi->hi_field, fname) == 0)
65 			break;
66 	}
67 
68 	/* if this means "end of header" quit now */
69 	if (bitset(H_EOH, hi->hi_flags))
70 		return (hi->hi_flags);
71 
72 	/* create/fill in a new node */
73 	if (h == NULL)
74 	{
75 		/* create a new node */
76 		*hp = h = (HDR *) xalloc(sizeof *h);
77 		h->h_field = newstr(fname);
78 		h->h_value = NULL;
79 		h->h_link = NULL;
80 		h->h_flags = hi->hi_flags;
81 		h->h_mflags = hi->hi_mflags;
82 	}
83 	if (def)
84 		h->h_flags |= H_DEFAULT;
85 	else
86 		h->h_flags &= ~H_CHECK;
87 	if (h->h_value != NULL)
88 		free(h->h_value);
89 	h->h_value = newstr(fvalue);
90 
91 	return (h->h_flags);
92 }
93 /*
94 **  HVALUE -- return value of a header.
95 **
96 **	Only "real" fields (i.e., ones that have not been supplied
97 **	as a default) are used.
98 **
99 **	Parameters:
100 **		field -- the field name.
101 **
102 **	Returns:
103 **		pointer to the value part.
104 **		NULL if not found.
105 **
106 **	Side Effects:
107 **		sets the H_USED bit in the header if found.
108 */
109 
110 char *
111 hvalue(field)
112 	char *field;
113 {
114 	register HDR *h;
115 
116 	for (h = Header; h != NULL; h = h->h_link)
117 	{
118 		if (!bitset(H_DEFAULT, h->h_flags) && strcmp(h->h_field, field) == 0)
119 		{
120 			h->h_flags |= H_USED;
121 			return (h->h_value);
122 		}
123 	}
124 	return (NULL);
125 }
126 /*
127 **  ISHEADER -- predicate telling if argument is a header.
128 **
129 **	Parameters:
130 **		s -- string to check for possible headerness.
131 **
132 **	Returns:
133 **		TRUE if s is a header.
134 **		FALSE otherwise.
135 **
136 **	Side Effects:
137 **		none.
138 */
139 
140 bool
141 isheader(s)
142 	register char *s;
143 {
144 	if (!isalnum(*s))
145 		return (FALSE);
146 	while (!isspace(*s) && *s != ':')
147 		s++;
148 	while (isspace(*s))
149 		s++;
150 	return (*s == ':');
151 }
152