1 # include <errno.h>
2 # include "sendmail.h"
3 
4 static char	SccsId[] = "@(#)headers.c	3.3	08/20/81";
5 
6 /*
7 **  CHOMPHEADER -- process and save a header line.
8 **
9 **	Called by collect and by readcf to deal with header lines.
10 **
11 **	Parameters:
12 **		line -- header as a text line.
13 **		def -- if set, this is a default value.
14 **
15 **	Returns:
16 **		flags for this header.
17 **
18 **	Side Effects:
19 **		The header is saved on the header list.
20 */
21 
22 chompheader(line, def)
23 	char *line;
24 	bool def;
25 {
26 	register char *p;
27 	register HDR *h;
28 	HDR **hp;
29 	extern bool isheader();
30 	char *fname;
31 	char *fvalue;
32 	struct hdrinfo *hi;
33 
34 	/* strip off trailing newline */
35 	p = rindex(line, '\n');
36 	if (p != NULL)
37 		*p = '\0';
38 
39 	/* find canonical name */
40 	fname = line;
41 	p = index(line, ':');
42 	fvalue = &p[1];
43 	while (isspace(*--p))
44 		continue;
45 	*++p = '\0';
46 	makelower(fname);
47 
48 	/* strip field value on front */
49 	if (*fvalue == ' ')
50 		fvalue++;
51 
52 	/* search header list for this header */
53 	for (hp = &Header, h = Header; h != NULL; hp = &h->h_link, h = h->h_link)
54 	{
55 		if (strcmp(fname, h->h_field) == 0 && bitset(H_DEFAULT, h->h_flags) &&
56 		    !bitset(H_FORCE, h->h_flags))
57 			break;
58 	}
59 
60 	/* see if it is a known type */
61 	for (hi = HdrInfo; hi->hi_field != NULL; hi++)
62 	{
63 		if (strcmp(hi->hi_field, fname) == 0)
64 			break;
65 	}
66 
67 	/* if this means "end of header" quit now */
68 	if (bitset(H_EOH, hi->hi_flags))
69 		return (hi->hi_flags);
70 
71 	/* create/fill in a new node */
72 	if (h == NULL)
73 	{
74 		/* create a new node */
75 		*hp = h = (HDR *) xalloc(sizeof *h);
76 		h->h_field = newstr(fname);
77 		h->h_value = NULL;
78 		h->h_link = NULL;
79 		h->h_flags = hi->hi_flags;
80 		h->h_mflags = hi->hi_mflags;
81 	}
82 	if (def)
83 		h->h_flags |= H_DEFAULT;
84 	else
85 		h->h_flags &= ~H_CHECK;
86 	if (h->h_value != NULL)
87 		free(h->h_value);
88 	h->h_value = newstr(fvalue);
89 
90 	return (h->h_flags);
91 }
92 /*
93 **  HVALUE -- return value of a header.
94 **
95 **	Only "real" fields (i.e., ones that have not been supplied
96 **	as a default) are used.
97 **
98 **	Parameters:
99 **		field -- the field name.
100 **
101 **	Returns:
102 **		pointer to the value part.
103 **		NULL if not found.
104 **
105 **	Side Effects:
106 **		sets the H_USED bit in the header if found.
107 */
108 
109 char *
110 hvalue(field)
111 	char *field;
112 {
113 	register HDR *h;
114 
115 	for (h = Header; h != NULL; h = h->h_link)
116 	{
117 		if (!bitset(H_DEFAULT, h->h_flags) && strcmp(h->h_field, field) == 0)
118 		{
119 			h->h_flags |= H_USED;
120 			return (h->h_value);
121 		}
122 	}
123 	return (NULL);
124 }
125 /*
126 **  ISHEADER -- predicate telling if argument is a header.
127 **
128 **	Parameters:
129 **		s -- string to check for possible headerness.
130 **
131 **	Returns:
132 **		TRUE if s is a header.
133 **		FALSE otherwise.
134 **
135 **	Side Effects:
136 **		none.
137 */
138 
139 bool
140 isheader(s)
141 	register char *s;
142 {
143 	if (!isalnum(*s))
144 		return (FALSE);
145 	while (!isspace(*s) && *s != ':')
146 		s++;
147 	while (isspace(*s))
148 		s++;
149 	return (*s == ':');
150 }
151