Commit | Line | Data |
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2e4ee99d KS |
1 | # |
2 | ||
3 | #include "rcv.h" | |
4 | ||
5 | /* | |
6 | * Mail -- a mail program | |
7 | * | |
8 | * Variable handling stuff. | |
9 | */ | |
10 | ||
46691008 | 11 | static char *SccsId = "@(#)vars.c 2.2 %G%"; |
2e4ee99d KS |
12 | |
13 | /* | |
14 | * Assign a value to a variable. | |
15 | */ | |
16 | ||
17 | assign(name, value) | |
18 | char name[], value[]; | |
19 | { | |
20 | register struct var *vp; | |
21 | register int h; | |
22 | ||
23 | h = hash(name); | |
24 | vp = lookup(name); | |
25 | if (vp == NOVAR) { | |
26 | vp = (struct var *) calloc(sizeof *vp, 1); | |
27 | vp->v_name = vcopy(name); | |
28 | vp->v_link = variables[h]; | |
29 | variables[h] = vp; | |
30 | } | |
31 | else | |
32 | vfree(vp->v_value); | |
33 | vp->v_value = vcopy(value); | |
34 | } | |
35 | ||
36 | /* | |
37 | * Free up a variable string. We do not bother to allocate | |
38 | * strings whose value is "" since they are expected to be frequent. | |
39 | * Thus, we cannot free same! | |
40 | */ | |
41 | ||
42 | vfree(cp) | |
43 | register char *cp; | |
44 | { | |
45 | if (!equal(cp, "")) | |
46 | cfree(cp); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Copy a variable value into permanent (ie, not collected after each | |
51 | * command) space. Do not bother to alloc space for "" | |
52 | */ | |
53 | ||
54 | char * | |
55 | vcopy(str) | |
56 | char str[]; | |
57 | { | |
58 | register char *top, *cp, *cp2; | |
59 | ||
60 | if (equal(str, "")) | |
61 | return(""); | |
62 | top = calloc(strlen(str)+1, 1); | |
63 | cp = top; | |
64 | cp2 = str; | |
65 | while (*cp++ = *cp2++) | |
66 | ; | |
67 | return(top); | |
68 | } | |
69 | ||
70 | /* | |
71 | * Get the value of a variable and return it. | |
72 | * Look in the environment if its not available locally. | |
73 | */ | |
74 | ||
75 | char * | |
76 | value(name) | |
77 | char name[]; | |
78 | { | |
79 | register struct var *vp; | |
80 | ||
81 | if ((vp = lookup(name)) == NOVAR) | |
82 | return(getenv(name)); | |
83 | return(vp->v_value); | |
84 | } | |
85 | ||
86 | /* | |
87 | * Locate a variable and return its variable | |
88 | * node. | |
89 | */ | |
90 | ||
91 | struct var * | |
92 | lookup(name) | |
93 | char name[]; | |
94 | { | |
95 | register struct var *vp; | |
96 | register int h; | |
97 | ||
98 | h = hash(name); | |
99 | for (vp = variables[h]; vp != NOVAR; vp = vp->v_link) | |
100 | if (equal(vp->v_name, name)) | |
101 | return(vp); | |
102 | return(NOVAR); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Locate a group name and return it. | |
107 | */ | |
108 | ||
109 | struct grouphead * | |
110 | findgroup(name) | |
111 | char name[]; | |
112 | { | |
113 | register struct grouphead *gh; | |
114 | register int h; | |
115 | ||
116 | h = hash(name); | |
117 | for (gh = groups[h]; gh != NOGRP; gh = gh->g_link) | |
118 | if (equal(gh->g_name, name)) | |
119 | return(gh); | |
120 | return(NOGRP); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Print a group out on stdout | |
125 | */ | |
126 | ||
127 | printgroup(name) | |
128 | char name[]; | |
129 | { | |
130 | register struct grouphead *gh; | |
131 | register struct group *gp; | |
132 | ||
133 | if ((gh = findgroup(name)) == NOGRP) { | |
134 | printf("\"%s\": not a group\n", name); | |
135 | return; | |
136 | } | |
137 | printf("%s\t", gh->g_name); | |
138 | for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link) | |
139 | printf(" %s", gp->ge_name); | |
140 | printf("\n"); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Hash the passed string and return an index into | |
145 | * the variable or group hash table. | |
146 | */ | |
147 | ||
148 | hash(name) | |
149 | char name[]; | |
150 | { | |
151 | register int h; | |
152 | register char *cp; | |
153 | ||
154 | for (cp = name, h = 0; *cp; h = (h << 2) + *cp++) | |
155 | ; | |
46691008 KS |
156 | if (h < 0) |
157 | h = -h; | |
158 | if (h < 0) | |
159 | h = 0; | |
2e4ee99d KS |
160 | return(h % HSHSIZE); |
161 | } |