Commit | Line | Data |
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761330fe DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
2ae9f53f | 7 | #ifndef lint |
2fd8b883 | 8 | static char *sccsid = "@(#)vars.c 5.2 (Berkeley) %G%"; |
761330fe | 9 | #endif not lint |
2e4ee99d KS |
10 | |
11 | #include "rcv.h" | |
12 | ||
13 | /* | |
14 | * Mail -- a mail program | |
15 | * | |
16 | * Variable handling stuff. | |
17 | */ | |
18 | ||
2e4ee99d KS |
19 | /* |
20 | * Assign a value to a variable. | |
21 | */ | |
22 | ||
23 | assign(name, value) | |
24 | char name[], value[]; | |
25 | { | |
26 | register struct var *vp; | |
27 | register int h; | |
28 | ||
29 | h = hash(name); | |
30 | vp = lookup(name); | |
31 | if (vp == NOVAR) { | |
32 | vp = (struct var *) calloc(sizeof *vp, 1); | |
33 | vp->v_name = vcopy(name); | |
34 | vp->v_link = variables[h]; | |
35 | variables[h] = vp; | |
36 | } | |
37 | else | |
38 | vfree(vp->v_value); | |
39 | vp->v_value = vcopy(value); | |
40 | } | |
41 | ||
42 | /* | |
43 | * Free up a variable string. We do not bother to allocate | |
44 | * strings whose value is "" since they are expected to be frequent. | |
45 | * Thus, we cannot free same! | |
46 | */ | |
47 | ||
48 | vfree(cp) | |
49 | register char *cp; | |
50 | { | |
51 | if (!equal(cp, "")) | |
52 | cfree(cp); | |
53 | } | |
54 | ||
55 | /* | |
56 | * Copy a variable value into permanent (ie, not collected after each | |
57 | * command) space. Do not bother to alloc space for "" | |
58 | */ | |
59 | ||
60 | char * | |
61 | vcopy(str) | |
62 | char str[]; | |
63 | { | |
64 | register char *top, *cp, *cp2; | |
65 | ||
66 | if (equal(str, "")) | |
67 | return(""); | |
733d2f97 CS |
68 | if ((top = calloc(strlen(str)+1, 1)) == NULL) |
69 | panic ("Out of memory"); | |
2e4ee99d KS |
70 | cp = top; |
71 | cp2 = str; | |
72 | while (*cp++ = *cp2++) | |
73 | ; | |
74 | return(top); | |
75 | } | |
76 | ||
77 | /* | |
78 | * Get the value of a variable and return it. | |
79 | * Look in the environment if its not available locally. | |
80 | */ | |
81 | ||
82 | char * | |
83 | value(name) | |
84 | char name[]; | |
85 | { | |
86 | register struct var *vp; | |
87 | ||
88 | if ((vp = lookup(name)) == NOVAR) | |
89 | return(getenv(name)); | |
90 | return(vp->v_value); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Locate a variable and return its variable | |
95 | * node. | |
96 | */ | |
97 | ||
98 | struct var * | |
99 | lookup(name) | |
100 | char name[]; | |
101 | { | |
102 | register struct var *vp; | |
103 | register int h; | |
104 | ||
105 | h = hash(name); | |
106 | for (vp = variables[h]; vp != NOVAR; vp = vp->v_link) | |
107 | if (equal(vp->v_name, name)) | |
108 | return(vp); | |
109 | return(NOVAR); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Locate a group name and return it. | |
114 | */ | |
115 | ||
116 | struct grouphead * | |
117 | findgroup(name) | |
118 | char name[]; | |
119 | { | |
120 | register struct grouphead *gh; | |
121 | register int h; | |
122 | ||
123 | h = hash(name); | |
124 | for (gh = groups[h]; gh != NOGRP; gh = gh->g_link) | |
125 | if (equal(gh->g_name, name)) | |
126 | return(gh); | |
127 | return(NOGRP); | |
128 | } | |
129 | ||
130 | /* | |
131 | * Print a group out on stdout | |
132 | */ | |
133 | ||
134 | printgroup(name) | |
135 | char name[]; | |
136 | { | |
137 | register struct grouphead *gh; | |
138 | register struct group *gp; | |
139 | ||
140 | if ((gh = findgroup(name)) == NOGRP) { | |
141 | printf("\"%s\": not a group\n", name); | |
142 | return; | |
143 | } | |
144 | printf("%s\t", gh->g_name); | |
145 | for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link) | |
146 | printf(" %s", gp->ge_name); | |
147 | printf("\n"); | |
148 | } | |
149 | ||
150 | /* | |
151 | * Hash the passed string and return an index into | |
152 | * the variable or group hash table. | |
153 | */ | |
154 | ||
155 | hash(name) | |
156 | char name[]; | |
157 | { | |
ca8907b2 | 158 | register unsigned h; |
2e4ee99d KS |
159 | register char *cp; |
160 | ||
161 | for (cp = name, h = 0; *cp; h = (h << 2) + *cp++) | |
162 | ; | |
46691008 KS |
163 | if (h < 0) |
164 | h = -h; | |
165 | if (h < 0) | |
166 | h = 0; | |
2e4ee99d KS |
167 | return(h % HSHSIZE); |
168 | } |