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Commit | Line | Data |
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1 | /* flags.c */ | |
2 | ||
3 | #include "flags.h" | |
4 | ||
5 | /* | |
6 | * setflags: | |
7 | * Applies a "+x-y+zab" style string to the inflags value. | |
8 | * | |
9 | * The "flagmask" input restricts the flags that can be changed. | |
10 | * The "reject" input specifies whether to silently drop or actively reject if: | |
11 | * REJECT_UNKNOWN: An unknown flag was specified | |
12 | * REJECT_DISALLOWED: An attempt was made to manipute a flag disallowed by flagmask | |
13 | */ | |
14 | ||
15 | int setflags(flag_t *inflags, flag_t flagmask, char *flagstr, const flag *flagslist, short reject) { | |
16 | int dir,i; | |
17 | flag_t newflags; | |
18 | char *ch; | |
19 | ||
20 | /* Work with a temporary copy */ | |
21 | newflags=*inflags; | |
22 | ||
23 | /* Default is to add flags */ | |
24 | dir=1; | |
25 | ||
26 | for(ch=flagstr;*ch;ch++) { | |
27 | if (*ch=='+') { | |
28 | dir=1; | |
29 | continue; | |
30 | } | |
31 | ||
32 | if (*ch=='-') { | |
33 | dir=0; | |
34 | continue; | |
35 | } | |
36 | ||
37 | for(i=0;flagslist[i].flagchar!='\0';i++) { | |
38 | if (*ch==flagslist[i].flagchar) { | |
39 | /* Check that the change is allowed */ | |
40 | if (flagmask & flagslist[i].flagbit) { | |
41 | if (dir==0) { | |
42 | newflags &= (~flagslist[i].flagbit); | |
43 | } else { | |
44 | newflags |= flagslist[i].flagbit; | |
45 | } | |
46 | } else { | |
47 | if (reject & REJECT_DISALLOWED) { | |
48 | return REJECT_DISALLOWED; | |
49 | } | |
50 | } | |
51 | /* We matched, stop looking */ | |
52 | break; | |
53 | } | |
54 | } | |
55 | ||
56 | if (flagslist[i].flagchar=='\0') { | |
57 | /* We didn't match anything */ | |
58 | if (reject & REJECT_UNKNOWN) { | |
59 | return REJECT_UNKNOWN; | |
60 | } | |
61 | } | |
62 | } | |
63 | ||
64 | /* We reached the end without bailing out; assign the flag changes */ | |
65 | *inflags=newflags; | |
66 | return REJECT_NONE; | |
67 | } | |
68 | ||
69 | /* | |
70 | * printflags: | |
71 | * Prints out which flags are currently set in a flag block | |
72 | */ | |
73 | char *printflags(flag_t inflags, const flag *flaglist) { | |
74 | static char buf[18]; | |
75 | int i; | |
76 | char *ch=buf; | |
77 | ||
78 | *ch++='+'; | |
79 | ||
80 | for (i=0;flaglist[i].flagchar!='\0' && i<16;i++) { | |
81 | if (inflags&flaglist[i].flagbit) { | |
82 | *ch++=flaglist[i].flagchar; | |
83 | } | |
84 | } | |
85 | ||
86 | *ch='\0'; | |
87 | return buf; | |
88 | } | |
89 | ||
90 | /* | |
91 | * printflagsornone: | |
92 | * Prints out which flags are currently set in a flag block, or return "none" | |
93 | */ | |
94 | char *printflagsornone(flag_t inflags, const flag *flaglist) { | |
95 | static char buf[18]; | |
96 | int i; | |
97 | char *ch=buf; | |
98 | ||
99 | *ch++='+'; | |
100 | ||
101 | for (i=0;flaglist[i].flagchar!='\0' && i<16;i++) { | |
102 | if (inflags&flaglist[i].flagbit) { | |
103 | *ch++=flaglist[i].flagchar; | |
104 | } | |
105 | } | |
106 | ||
107 | *ch='\0'; | |
108 | if (ch==(buf+1)) /* No flags set */ | |
109 | return "none"; | |
110 | ||
111 | return buf; | |
112 | } | |
113 | /* ugh */ | |
114 | ||
115 | char *printflags_noprefix(flag_t inflags, const flag *flaglist) { | |
116 | static char buf[18]; | |
117 | int i; | |
118 | char *ch=buf; | |
119 | ||
120 | for (i=0;flaglist[i].flagchar!='\0' && i<16;i++) { | |
121 | if (inflags&flaglist[i].flagbit) { | |
122 | *ch++=flaglist[i].flagchar; | |
123 | } | |
124 | } | |
125 | ||
126 | *ch='\0'; | |
127 | return buf; | |
128 | } | |
129 | ||
130 | ||
131 | ||
132 | /* | |
133 | * printflagdiff: | |
134 | * Prints the flag changes needed to change "oldflags" into "newflags" | |
135 | */ | |
136 | ||
137 | char *printflagdiff(flag_t oldflags, flag_t newflags, const flag *flaglist) { | |
138 | static char buf[30]; | |
139 | int i; | |
140 | char *ch=buf; | |
141 | int chd=0; | |
142 | ||
143 | /* Removes first */ | |
144 | ||
145 | for (i=0;flaglist[i].flagchar!='\0' && i<16;i++) { | |
146 | if ((oldflags & flaglist[i].flagbit) && !(newflags & flaglist[i].flagbit)) { | |
147 | if (chd==0) { | |
148 | chd=1; | |
149 | *ch++='-'; | |
150 | } | |
151 | *ch++=flaglist[i].flagchar; | |
152 | } | |
153 | } | |
154 | ||
155 | /* Now adds */ | |
156 | chd=0; | |
157 | ||
158 | for (i=0;flaglist[i].flagchar!='\0' && i<16;i++) { | |
159 | if (!(oldflags & flaglist[i].flagbit) && (newflags & flaglist[i].flagbit)) { | |
160 | if (chd==0) { | |
161 | chd=1; | |
162 | *ch++='+'; | |
163 | } | |
164 | *ch++=flaglist[i].flagchar; | |
165 | } | |
166 | } | |
167 | ||
168 | *ch='\0'; | |
169 | return buf; | |
170 | } |