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ed5033fd LP |
1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
2 | ||
3 | #include "percent-util.h" | |
4 | #include "string-util.h" | |
5 | #include "parse-util.h" | |
6 | ||
7 | static int parse_parts_value_whole(const char *p, const char *symbol) { | |
8 | const char *pc, *n; | |
9 | int r, v; | |
10 | ||
11 | pc = endswith(p, symbol); | |
12 | if (!pc) | |
13 | return -EINVAL; | |
14 | ||
2f82562b | 15 | n = strndupa_safe(p, pc - p); |
ed5033fd LP |
16 | r = safe_atoi(n, &v); |
17 | if (r < 0) | |
18 | return r; | |
19 | if (v < 0) | |
20 | return -ERANGE; | |
21 | ||
22 | return v; | |
23 | } | |
24 | ||
25 | static int parse_parts_value_with_tenths_place(const char *p, const char *symbol) { | |
26 | const char *pc, *dot, *n; | |
27 | int r, q, v; | |
28 | ||
29 | pc = endswith(p, symbol); | |
30 | if (!pc) | |
31 | return -EINVAL; | |
32 | ||
33 | dot = memchr(p, '.', pc - p); | |
34 | if (dot) { | |
35 | if (dot + 2 != pc) | |
36 | return -EINVAL; | |
37 | if (dot[1] < '0' || dot[1] > '9') | |
38 | return -EINVAL; | |
39 | q = dot[1] - '0'; | |
2f82562b | 40 | n = strndupa_safe(p, dot - p); |
ed5033fd LP |
41 | } else { |
42 | q = 0; | |
2f82562b | 43 | n = strndupa_safe(p, pc - p); |
ed5033fd LP |
44 | } |
45 | r = safe_atoi(n, &v); | |
46 | if (r < 0) | |
47 | return r; | |
48 | if (v < 0) | |
49 | return -ERANGE; | |
50 | if (v > (INT_MAX - q) / 10) | |
51 | return -ERANGE; | |
52 | ||
53 | v = v * 10 + q; | |
54 | return v; | |
55 | } | |
56 | ||
57 | static int parse_parts_value_with_hundredths_place(const char *p, const char *symbol) { | |
58 | const char *pc, *dot, *n; | |
59 | int r, q, v; | |
60 | ||
61 | pc = endswith(p, symbol); | |
62 | if (!pc) | |
63 | return -EINVAL; | |
64 | ||
65 | dot = memchr(p, '.', pc - p); | |
66 | if (dot) { | |
38d0c270 LP |
67 | if (dot + 3 == pc) { |
68 | /* Support two places after the dot */ | |
69 | ||
70 | if (dot[1] < '0' || dot[1] > '9' || dot[2] < '0' || dot[2] > '9') | |
71 | return -EINVAL; | |
72 | q = (dot[1] - '0') * 10 + (dot[2] - '0'); | |
73 | ||
74 | } else if (dot + 2 == pc) { | |
75 | /* Support one place after the dot */ | |
76 | ||
77 | if (dot[1] < '0' || dot[1] > '9') | |
78 | return -EINVAL; | |
79 | q = (dot[1] - '0') * 10; | |
80 | } else | |
81 | /* We do not support zero or more than two places */ | |
ed5033fd | 82 | return -EINVAL; |
38d0c270 | 83 | |
2f82562b | 84 | n = strndupa_safe(p, dot - p); |
ed5033fd LP |
85 | } else { |
86 | q = 0; | |
2f82562b | 87 | n = strndupa_safe(p, pc - p); |
ed5033fd LP |
88 | } |
89 | r = safe_atoi(n, &v); | |
90 | if (r < 0) | |
91 | return r; | |
92 | if (v < 0) | |
93 | return -ERANGE; | |
94 | if (v > (INT_MAX - q) / 100) | |
95 | return -ERANGE; | |
96 | ||
97 | v = v * 100 + q; | |
98 | return v; | |
99 | } | |
100 | ||
101 | int parse_percent_unbounded(const char *p) { | |
102 | return parse_parts_value_whole(p, "%"); | |
103 | } | |
104 | ||
105 | int parse_percent(const char *p) { | |
106 | int v; | |
107 | ||
108 | v = parse_percent_unbounded(p); | |
109 | if (v > 100) | |
110 | return -ERANGE; | |
111 | ||
112 | return v; | |
113 | } | |
114 | ||
115 | int parse_permille_unbounded(const char *p) { | |
116 | const char *pm; | |
117 | ||
118 | pm = endswith(p, "‰"); | |
119 | if (pm) | |
120 | return parse_parts_value_whole(p, "‰"); | |
121 | ||
122 | return parse_parts_value_with_tenths_place(p, "%"); | |
123 | } | |
124 | ||
125 | int parse_permille(const char *p) { | |
126 | int v; | |
127 | ||
128 | v = parse_permille_unbounded(p); | |
129 | if (v > 1000) | |
130 | return -ERANGE; | |
131 | ||
132 | return v; | |
133 | } | |
134 | ||
135 | int parse_permyriad_unbounded(const char *p) { | |
136 | const char *pm; | |
137 | ||
138 | pm = endswith(p, "‱"); | |
139 | if (pm) | |
140 | return parse_parts_value_whole(p, "‱"); | |
141 | ||
142 | pm = endswith(p, "‰"); | |
143 | if (pm) | |
144 | return parse_parts_value_with_tenths_place(p, "‰"); | |
145 | ||
146 | return parse_parts_value_with_hundredths_place(p, "%"); | |
147 | } | |
148 | ||
149 | int parse_permyriad(const char *p) { | |
150 | int v; | |
151 | ||
152 | v = parse_permyriad_unbounded(p); | |
153 | if (v > 10000) | |
154 | return -ERANGE; | |
155 | ||
156 | return v; | |
157 | } |