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/* version.c - Version check routines.
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2003 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GPGME; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* For _gpgme_sema_subsystem_init (). */
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/* Bootstrap the subsystems needed for concurrent operation. This
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must be done once at startup. We can not guarantee this using a
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lock, though, because the semaphore subsystem needs to be
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initialized itself before it can be used. So we expect that the
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user performs the necessary syncrhonization. */
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do_subsystem_inits (void)
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_gpgme_sema_subsystem_init ();
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_gpgme_io_subsystem_init ();
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/* Read the next number in the version string STR and return it in
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*NUMBER. Return a pointer to the tail of STR after parsing, or
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*NULL if the version string was invalid. */
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parse_version_number (const char *str, int *number)
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#define MAXVAL ((INT_MAX - 10) / 10)
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/* Leading zeros are not allowed. */
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if (*str == '0' && isdigit(str[1]))
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while (isdigit (*str) && val <= MAXVAL)
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val += *(str++) - '0';
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return val > MAXVAL ? NULL : str;
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/* Parse the version string STR in the format MAJOR.MINOR.MICRO (for
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example, 9.3.2) and return the components in MAJOR, MINOR and MICRO
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as integers. The function returns the tail of the string that
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follows the version number. This might be te empty string if there
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is nothing following the version number, or a patchlevel. The
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function returns NULL if the version string is not valid. */
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parse_version_string (const char *str, int *major, int *minor, int *micro)
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str = parse_version_number (str, major);
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if (!str || *str != '.')
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str = parse_version_number (str, minor);
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if (!str || *str != '.')
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str = parse_version_number (str, micro);
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/* A patchlevel might follow. */
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_gpgme_compare_versions (const char *my_version,
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const char *rq_version)
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int my_major, my_minor, my_micro;
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int rq_major, rq_minor, rq_micro;
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const char *my_plvl, *rq_plvl;
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my_plvl = parse_version_string (my_version, &my_major, &my_minor, &my_micro);
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rq_plvl = parse_version_string (rq_version, &rq_major, &rq_minor, &rq_micro);
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if (my_major > rq_major
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|| (my_major == rq_major && my_minor > rq_minor)
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|| (my_major == rq_major && my_minor == rq_minor
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&& my_micro > rq_micro)
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|| (my_major == rq_major && my_minor == rq_minor
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&& my_micro == rq_micro && strcmp (my_plvl, rq_plvl) >= 0))
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/* Check that the the version of the library is at minimum the
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requested one and return the version string; return NULL if the
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condition is not met. If a NULL is passed to this function, no
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check is done and the version string is simply returned.
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This function must be run once at startup, as it also initializes
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some subsystems. Its invocation must be synchronized against
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calling any of the other functions in a multi-threaded
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gpgme_check_version (const char *req_version)
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do_subsystem_inits ();
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return _gpgme_compare_versions (VERSION, req_version);
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#define LINELENGTH 80
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/* Retrieve the version number from the --version output of the
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program FILE_NAME. */
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_gpgme_get_program_version (const char *const file_name)
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char line[LINELENGTH] = "";
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char *argv[] = {NULL /* file_name */, "--version", 0};
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struct spawn_fd_item_s pfd[] = { {0, -1}, {-1, -1} };
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struct spawn_fd_item_s cfd[] = { {-1, 1 /* STDOUT_FILENO */}, {-1, -1} };
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argv[0] = (char *) file_name;
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if (_gpgme_io_pipe (rp, 1) < 0)
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status = _gpgme_io_spawn (file_name, argv, cfd, pfd);
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_gpgme_io_close (rp[0]);
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_gpgme_io_close (rp[1]);
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nread = _gpgme_io_read (rp[0], &line[linelen], LINELENGTH - linelen - 1);
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line[linelen + nread] = '\0';
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mark = strchr (&line[linelen], '\n');
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while (nread > 0 && linelen < LINELENGTH - 1);
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_gpgme_io_close (rp[0]);
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mark = strrchr (line, ' ');
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return strdup (mark + 1);