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1 | /* |
2 | * libdpkg - Debian packaging suite library routines | |
3 | * deb-version.c - deb format version handling routines | |
4 | * | |
5 | * Copyright © 2012-2013 Guillem Jover <guillem@debian.org> | |
6 | * | |
7 | * This is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <compat.h> | |
23 | ||
24 | #include <limits.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | #include <dpkg/i18n.h> | |
29 | #include <dpkg/c-ctype.h> | |
30 | #include <dpkg/dpkg.h> | |
31 | #include <dpkg/deb-version.h> | |
32 | ||
33 | /** | |
34 | * Parse a .deb format version. | |
35 | * | |
36 | * It takes a string and parses a .deb archive format version in the form | |
37 | * of "X.Y", without any leading whitespace, and ending in either a newline | |
38 | * or a NUL. If there is any syntax error a descriptive error string is | |
39 | * returned. | |
40 | * | |
41 | * @param version The version to return. | |
42 | * @param str The string to parse. | |
43 | * | |
44 | * @return An error string, or NULL if there was no error. | |
45 | */ | |
46 | const char * | |
47 | deb_version_parse(struct deb_version *version, const char *str) | |
48 | { | |
49 | const char *str_minor, *end; | |
50 | unsigned int major = 0; | |
51 | unsigned int minor = 0; | |
52 | unsigned int divlimit = INT_MAX / 10; | |
53 | int modlimit = INT_MAX % 10; | |
54 | ||
55 | for (end = str; *end && c_isdigit(*end); end++) { | |
56 | int ord = *end - '0'; | |
57 | ||
58 | if (major > divlimit || (major == divlimit && ord > modlimit)) | |
59 | return _("format version with too big major component"); | |
60 | ||
61 | major = major * 10 + ord; | |
62 | } | |
63 | ||
64 | if (end == str) | |
65 | return _("format version with empty major component"); | |
66 | if (*end != '.') | |
67 | return _("format version has no dot"); | |
68 | ||
69 | for (end = str_minor = end + 1; *end && c_isdigit(*end); end++) { | |
70 | int ord = *end - '0'; | |
71 | ||
72 | if (minor > divlimit || (minor == divlimit && ord > modlimit)) | |
73 | return _("format version with too big minor component"); | |
74 | ||
75 | minor = minor * 10 + ord; | |
76 | } | |
77 | ||
78 | if (end == str_minor) | |
79 | return _("format version with empty minor component"); | |
80 | if (*end != '\n' && *end != '\0') | |
81 | return _("format version followed by junk"); | |
82 | ||
83 | version->major = major; | |
84 | version->minor = minor; | |
85 | ||
86 | return NULL; | |
87 | } |