1 /* version.c - Version check routines.
2 Copyright (C) 2000 Werner Koch (dd9jn)
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008 g10 Code GmbH
5 This file is part of GPGME.
7 GPGME is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of
10 the License, or (at your option) any later version.
12 GPGME is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 #ifdef HAVE_W32_SYSTEM
36 /* For _gpgme_sema_subsystem_init (). */
44 /* Bootstrap the subsystems needed for concurrent operation. This
45 must be done once at startup. We can not guarantee this using a
46 lock, though, because the semaphore subsystem needs to be
47 initialized itself before it can be used. So we expect that the
48 user performs the necessary synchronization. */
50 do_subsystem_inits (void)
57 _gpgme_sema_subsystem_init ();
59 assuan_set_assuan_log_level (0);
60 assuan_set_assuan_err_source (GPG_ERR_SOURCE_GPGME);
61 #endif /*HAVE_ASSUAN_H*/
62 _gpgme_debug_subsystem_init ();
63 _gpgme_io_subsystem_init ();
64 #if defined(HAVE_W32_SYSTEM) && defined(HAVE_ASSUAN_H)
65 /* We need to make sure that the sockets are initialized. */
69 WSAStartup (0x202, &wsadat);
71 #endif /*HAVE_W32_SYSTEM && HAVE_ASSUAN_H*/
77 /* Read the next number in the version string STR and return it in
78 *NUMBER. Return a pointer to the tail of STR after parsing, or
79 *NULL if the version string was invalid. */
81 parse_version_number (const char *str, int *number)
83 #define MAXVAL ((INT_MAX - 10) / 10)
86 /* Leading zeros are not allowed. */
87 if (*str == '0' && isdigit(str[1]))
90 while (isdigit (*str) && val <= MAXVAL)
93 val += *(str++) - '0';
96 return val > MAXVAL ? NULL : str;
100 /* Parse the version string STR in the format MAJOR.MINOR.MICRO (for
101 example, 9.3.2) and return the components in MAJOR, MINOR and MICRO
102 as integers. The function returns the tail of the string that
103 follows the version number. This might be te empty string if there
104 is nothing following the version number, or a patchlevel. The
105 function returns NULL if the version string is not valid. */
107 parse_version_string (const char *str, int *major, int *minor, int *micro)
109 str = parse_version_number (str, major);
110 if (!str || *str != '.')
114 str = parse_version_number (str, minor);
115 if (!str || *str != '.')
119 str = parse_version_number (str, micro);
123 /* A patchlevel might follow. */
128 /* Return true if MY_VERSION is at least REQ_VERSION, and false
131 _gpgme_compare_versions (const char *my_version,
132 const char *rq_version)
134 int my_major, my_minor, my_micro;
135 int rq_major, rq_minor, rq_micro;
136 const char *my_plvl, *rq_plvl;
143 my_plvl = parse_version_string (my_version, &my_major, &my_minor, &my_micro);
147 rq_plvl = parse_version_string (rq_version, &rq_major, &rq_minor, &rq_micro);
151 if (my_major > rq_major
152 || (my_major == rq_major && my_minor > rq_minor)
153 || (my_major == rq_major && my_minor == rq_minor
154 && my_micro > rq_micro)
155 || (my_major == rq_major && my_minor == rq_minor
156 && my_micro == rq_micro && strcmp (my_plvl, rq_plvl) >= 0))
163 /* Check that the the version of the library is at minimum the
164 requested one and return the version string; return NULL if the
165 condition is not met. If a NULL is passed to this function, no
166 check is done and the version string is simply returned.
168 This function must be run once at startup, as it also initializes
169 some subsystems. Its invocation must be synchronized against
170 calling any of the other functions in a multi-threaded
173 gpgme_check_version (const char *req_version)
175 do_subsystem_inits ();
177 /* Catch-22: We need to get at least the debug subsystem ready
178 before using the tarce facility. If we won't the tarce would
179 automagically initialize the debug system with out the locks
180 being initialized and missing the assuan log level setting. */
181 TRACE2 (DEBUG_INIT, "gpgme_check_version: ", 0,
182 "req_version=%s, VERSION=%s", req_version, VERSION);
184 return _gpgme_compare_versions (VERSION, req_version) ? VERSION : NULL;
188 #define LINELENGTH 80
190 /* Extract the version string of a program from STRING. The version
191 number is expected to be in GNU style format:
194 foo (bar system) 1.2.3
196 foo (bar system) 1.2.3 cruft.
198 Spaces and tabs are skipped and used as delimiters, a term in
199 (nested) parenthesis before the version string is skipped, the
200 version string may consist of any non-space and non-tab characters
201 but needs to bstart with a digit.
204 extract_version_string (const char *string, size_t *r_len)
209 for (s=string; *s; s++)
210 if (*s == ' ' || *s == '\t')
212 while (*s == ' ' || *s == '\t')
216 for (count=1, s++; count && *s; s++)
222 /* For robustness we look for a digit. */
223 while ( *s && !(*s >= '0' && *s <= '9') )
225 if (*s >= '0' && *s <= '9')
227 for (len=0; s[len]; len++)
228 if (s[len] == ' ' || s[len] == '\t')
239 /* Retrieve the version number from the --version output of the
240 program FILE_NAME. */
242 _gpgme_get_program_version (const char *const file_name)
244 char line[LINELENGTH] = "";
249 char *argv[] = {NULL /* file_name */, "--version", 0};
250 struct spawn_fd_item_s cfd[] = { {-1, 1 /* STDOUT_FILENO */, -1, 0},
256 argv[0] = (char *) file_name;
258 if (_gpgme_io_pipe (rp, 1) < 0)
263 status = _gpgme_io_spawn (file_name, argv, cfd, NULL);
266 _gpgme_io_close (rp[0]);
267 _gpgme_io_close (rp[1]);
273 nread = _gpgme_io_read (rp[0], &line[linelen], LINELENGTH - linelen - 1);
276 line[linelen + nread] = '\0';
277 mark = strchr (&line[linelen], '\n');
280 if (mark > &line[0] && *mark == '\r')
288 while (nread > 0 && linelen < LINELENGTH - 1);
290 _gpgme_io_close (rp[0]);
297 s = extract_version_string (line, &len);
300 mark = malloc (len + 1);
303 memcpy (mark, s, len);