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<h1>version-cmp.c</h1><a href="version-cmp_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001
00011 <span class="comment">/* $Progeny$</span>
00012 <span class="comment"> *</span>
00013 <span class="comment"> * AUTHOR: John R. Daily <jdaily@progeny.com></span>
00014 <span class="comment"> *</span>
00015 <span class="comment"> * Copyright 2002 Progeny Linux Systems, Inc.</span>
00016 <span class="comment"> * Copyright 2002 Hewlett-Packard Company</span>
00017 <span class="comment"> *</span>
00018 <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span>
00019 <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span>
00020 <span class="comment"> * to deal in the Software without restriction, including without limitation</span>
00021 <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span>
00022 <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span>
00023 <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span>
00024 <span class="comment"> *</span>
00025 <span class="comment"> * The above copyright notice and this permission notice shall be included in</span>
00026 <span class="comment"> * all copies or substantial portions of the Software.</span>
00027 <span class="comment"> *</span>
00028 <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
00029 <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
00030 <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span>
00031 <span class="comment"> * THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
00032 <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span>
00033 <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span>
00034 <span class="comment"> * DEALINGS IN THE SOFTWARE.</span>
00035 <span class="comment"> */</span>
00036
00037 <span class="comment">/*</span>
00038 <span class="comment"> * This package should include a state machine diagram that</span>
00039 <span class="comment"> * is important to understanding this code.</span>
00040 <span class="comment"> */</span>
00041
00042 <span class="preprocessor">#include "config.h"</span>
00043
00044 <span class="preprocessor">#include <assert.h></span>
00045 <span class="preprocessor">#include <ctype.h></span>
00046 <span class="preprocessor">#include <stdio.h></span>
00047 <span class="preprocessor">#include <stdlib.h></span>
00048 <span class="preprocessor">#include <string.h></span>
00049
00050 <span class="preprocessor">#include <<a class="code" href="discover_8h.html">discover/discover.h</a>></span>
00051
00052 <span class="preprocessor">#include <discover/utils.h></span>
00053
<a name="l00055"></a><a class="code" href="version-cmp_8c.html#a0">00055</a> <span class="preprocessor">#define MAXBUFLEN 256</span>
00056 <span class="preprocessor"></span>
<a name="l00058"></a><a class="code" href="version-cmp_8c.html#a21">00058</a> <span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code" href="version-cmp_8c.html#a21">range_states</a> {
00059 START,
00060 OPEN,
00061 VERSION1,
00062 VERSEP1,
00063 PAUSE1,
00064 SEPARATOR,
00065 I, N, F,
00066 VERSION2,
00067 VERSEP2,
00068 PAUSE2,
00069 CLOSE,
00070 ERROR
00071 }
00073 <a class="code" href="version-cmp_8c.html#a1">range_state</a>;
00074
00075 <span class="comment">/*</span>
00076 <span class="comment"> * For now, we only understand '.' as a separator, but that could</span>
00077 <span class="comment"> * change.</span>
00078 <span class="comment"> */</span>
00079 <span class="keyword">static</span> <span class="keywordtype">int</span>
00080 is_versep_char(<span class="keywordtype">char</span> c)
00081 {
00082 <span class="keywordflow">return</span> c == <span class="charliteral">'.'</span>;
00083 }
00084
00085 <span class="comment">/*</span>
00086 <span class="comment"> * Wrapper for isdigit(), in case we want to add more legitimate</span>
00087 <span class="comment"> * version characters later.</span>
00088 <span class="comment"> */</span>
00089 <span class="keyword">static</span> <span class="keywordtype">int</span>
00090 is_version_char(<span class="keywordtype">char</span> c)
00091 {
00092 <span class="keywordflow">return</span> isdigit(c);
00093 }
00094
00095 <span class="comment">/*</span>
00096 <span class="comment"> * We only handle dot-separated integers. Anything else becomes</span>
00097 <span class="comment"> * subject to interpretation.</span>
00098 <span class="comment"> *</span>
00099 <span class="comment"> * Return values:</span>
00100 <span class="comment"> * 1 - v1 is higher</span>
00101 <span class="comment"> * 0 - v2 is higher</span>
00102 <span class="comment"> * -1 - v1, v2 are equivalent</span>
00103 <span class="comment"> *</span>
00104 <span class="comment"> * The string "inf" represents an undefined upper bound; the equivalent on</span>
00105 <span class="comment"> * the lower bound should be 0.</span>
00106 <span class="comment"> */</span>
00107 <span class="keyword">static</span> <span class="keywordtype">int</span>
00108 version_compare(<span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keyword">const</span> v1, <span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keyword">const</span> v2)
00109 {
00110 <span class="keywordtype">int</span> int1, int2;
00111 <span class="keywordtype">char</span> *word1, *word2;
00112 <span class="keywordtype">char</span> *version1, *version2;
00113 <span class="keywordtype">char</span> *buffer1;
00114 <span class="keywordtype">char</span> *buffer2;
00115
00116 <span class="keywordflow">if</span> (strcmp(v1, v2) == 0) {
00117 <span class="keywordflow">return</span> -1;
00118 }
00119
00120 <span class="keywordflow">if</span> (strcmp(v1, <span class="stringliteral">"inf"</span>) == 0) {
00121 <span class="keywordflow">return</span> 1;
00122 }
00123
00124 <span class="keywordflow">if</span> (strcmp(v2, <span class="stringliteral">"inf"</span>) == 0) {
00125 <span class="keywordflow">return</span> 0;
00126 }
00127
00128 buffer1 = _discover_xmalloc(<a class="code" href="version-cmp_8c.html#a0">MAXBUFLEN</a>);
00129 buffer2 = _discover_xmalloc(<a class="code" href="version-cmp_8c.html#a0">MAXBUFLEN</a>);
00130
00131 version1 = _discover_xstrdup(v1);
00132 version2 = _discover_xstrdup(v2);
00133
00134 word1 = strtok_r(version1, <span class="stringliteral">"."</span>, &buffer1);
00135 word2 = strtok_r(version2, <span class="stringliteral">"."</span>, &buffer2);
00136
00137 <span class="keywordflow">do</span> {
00138 sscanf(word1, <span class="stringliteral">"%d"</span>, &int1);
00139 sscanf(word2, <span class="stringliteral">"%d"</span>, &int2);
00140
00141 <span class="keywordflow">if</span> (int1 != int2) {
00142 <span class="keywordflow">return</span> int1 > int2;
00143 }
00144
00145 word1 = strtok_r(NULL, <span class="stringliteral">"."</span>, &buffer1);
00146 word2 = strtok_r(NULL, <span class="stringliteral">"."</span>, &buffer2);
00147
00148 } <span class="keywordflow">while</span>(word1 != NULL && word2 != NULL);
00149
00150 free(version1);
00151 free(version2);
00152
00153 <span class="keywordflow">if</span> (word2 == NULL && word1 == NULL) {
00154 <span class="keywordflow">return</span> -1;
00155 }
00156 <span class="keywordflow">if</span> (word2 == NULL) {
00157 <span class="keywordflow">return</span> 1;
00158 }
00159 <span class="keywordflow">return</span> -0;
00160 }
00161
00162
00163 <span class="keyword">static</span> <span class="keywordtype">int</span>
00164 determine_range(<span class="keywordtype">char</span> * range_text, <span class="keywordtype">char</span> **upper,
00165 <span class="keywordtype">int</span> *upper_inclusive, <span class="keywordtype">char</span> **lower, <span class="keywordtype">int</span> *lower_inclusive,
00166 <span class="keywordtype">char</span> **next)
00167 {
00168 <span class="keywordtype">char</span> *current = range_text;
00169 <span class="keywordtype">char</span> c;
00170 <span class="keywordtype">char</span> last_char = <span class="charliteral">'\0'</span>;
00171
00172 <span class="keywordtype">char</span> buffer1[<a class="code" href="version-cmp_8c.html#a0">MAXBUFLEN</a>];
00173 <span class="keywordtype">char</span> *bufptr1 = buffer1;
00174
00175 <span class="keywordtype">char</span> buffer2[<a class="code" href="version-cmp_8c.html#a0">MAXBUFLEN</a>];
00176 <span class="keywordtype">char</span> *bufptr2 = buffer2;
00177
00178 <a class="code" href="version-cmp_8c.html#a1">range_state</a> <a class="code" href="conf_8c.html#a33">state</a> = START;
00179 <a class="code" href="version-cmp_8c.html#a1">range_state</a> last_good_state = START;
00180 <span class="keywordtype">int</span> first_inclusive = -1, second_inclusive = -1;
00181
00182 <span class="keywordflow">while</span>(1) {
00183 c = *current;
00184
00185 <span class="keywordflow">switch</span>(state) {
00186 <span class="keywordflow">case</span> START:
00187 <span class="keywordflow">if</span> (isspace(c)) {
00188 state = START;
00189 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == <span class="charliteral">'('</span> || c == <span class="charliteral">'['</span>) {
00190 state = OPEN;
00191 } <span class="keywordflow">else</span> {
00192 last_good_state = state;
00193 state = ERROR;
00194 }
00195 <span class="keywordflow">break</span>;
00196
00197 <span class="keywordflow">case</span> OPEN:
00198 <span class="keywordflow">if</span> (last_char == <span class="charliteral">'['</span>) {
00199 first_inclusive = 1;
00200 } <span class="keywordflow">else</span> {
00201 first_inclusive = 0;
00202 }
00203
00204 <span class="keywordflow">if</span> (isspace(c)) {
00205 state = OPEN;
00206 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_version_char(c)) {
00207 state = VERSION1;
00208 } <span class="keywordflow">else</span> {
00209 last_good_state = state;
00210 state = ERROR;
00211 }
00212 <span class="keywordflow">break</span>;
00213
00214 <span class="keywordflow">case</span> VERSION1:
00215 <span class="keywordflow">if</span> (bufptr1 - buffer1 > 254) {
00216 last_good_state = state;
00217 state = ERROR;
00218 <span class="keywordflow">break</span>;
00219 }
00220
00221 *bufptr1 = last_char;
00222 bufptr1++;
00223
00224 <span class="keywordflow">if</span> (isspace(c) || c == <span class="charliteral">','</span>) {
00225 *bufptr1 = <span class="charliteral">'\0'</span>;
00226
00227 <span class="keywordflow">if</span> (c == <span class="charliteral">','</span>) {
00228 state = SEPARATOR;
00229 } <span class="keywordflow">else</span> {
00230 state = PAUSE1;
00231 }
00232 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_version_char(c)) {
00233 state = VERSION1;
00234 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_versep_char(c)) {
00235 state = VERSEP1;
00236 } <span class="keywordflow">else</span> {
00237 last_good_state = VERSION1;
00238 state = ERROR;
00239 }
00240 <span class="keywordflow">break</span>;
00241
00242 <span class="keywordflow">case</span> VERSEP1:
00243 <span class="keywordflow">if</span> (bufptr1 - buffer1 > 254) {
00244 last_good_state = state;
00245 state = ERROR;
00246 <span class="keywordflow">break</span>;
00247 }
00248
00249 *bufptr1 = last_char;
00250 bufptr1++;
00251
00252 <span class="keywordflow">if</span> (is_version_char(c)) {
00253 state = VERSION1;
00254 } <span class="keywordflow">else</span> {
00255 last_good_state = VERSION1;
00256 state = ERROR;
00257 }
00258 <span class="keywordflow">break</span>;
00259
00260 <span class="keywordflow">case</span> PAUSE1:
00261 <span class="keywordflow">if</span> (isspace(c)) {
00262 state = PAUSE1;
00263 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == <span class="charliteral">','</span>) {
00264 state = SEPARATOR;
00265 } <span class="keywordflow">else</span> {
00266 last_good_state = PAUSE1;
00267 state = ERROR;
00268 }
00269 <span class="keywordflow">break</span>;
00270
00271 <span class="keywordflow">case</span> SEPARATOR:
00272 <span class="keywordflow">if</span> (isspace(c)) {
00273 state = SEPARATOR;
00274 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_version_char(c)) {
00275 state = VERSION2;
00276 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == <span class="charliteral">'i'</span>) {
00277 state = I;
00278 } <span class="keywordflow">else</span> {
00279 last_good_state = SEPARATOR;
00280 state = ERROR;
00281 }
00282 <span class="keywordflow">break</span>;
00283
00284 <span class="keywordflow">case</span> I:
00285 <span class="keywordflow">if</span> (c == <span class="charliteral">'n'</span>) {
00286 state = N;
00287 } <span class="keywordflow">else</span> {
00288 last_good_state = state;
00289 state = ERROR;
00290 }
00291 <span class="keywordflow">break</span>;
00292
00293 <span class="keywordflow">case</span> N:
00294 <span class="keywordflow">if</span> (c == <span class="charliteral">'f'</span>) {
00295 state = F;
00296 } <span class="keywordflow">else</span> {
00297 last_good_state = state;
00298 state = ERROR;
00299 }
00300 <span class="keywordflow">break</span>;
00301
00302 <span class="keywordflow">case</span> F:
00303 strcpy(bufptr2, <span class="stringliteral">"inf"</span>);
00304 <span class="keywordflow">if</span> (isspace(c)) {
00305 state = PAUSE2;
00306 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == <span class="charliteral">')'</span> || c == <span class="charliteral">']'</span>) {
00307 state = CLOSE;
00308 } <span class="keywordflow">else</span> {
00309 last_good_state = state;
00310 state = ERROR;
00311 }
00312 <span class="keywordflow">break</span>;
00313
00314 <span class="keywordflow">case</span> VERSION2:
00315 <span class="keywordflow">if</span> (bufptr2 - buffer2 > 254) {
00316 last_good_state = state;
00317 state = ERROR;
00318 <span class="keywordflow">break</span>;
00319 }
00320
00321 *bufptr2 = last_char;
00322 bufptr2++;
00323
00324 <span class="keywordflow">if</span> (isspace(c) || c == <span class="charliteral">')'</span> || c == <span class="charliteral">']'</span>) {
00325 *bufptr2 = <span class="charliteral">'\0'</span>;
00326
00327 <span class="keywordflow">if</span> (c == <span class="charliteral">')'</span> || c == <span class="charliteral">']'</span>) {
00328 state = CLOSE;
00329 } <span class="keywordflow">else</span> {
00330 state = PAUSE2;
00331 }
00332 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_version_char(c)) {
00333 state = VERSION2;
00334 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (is_versep_char(c)) {
00335 state = VERSEP2;
00336 } <span class="keywordflow">else</span> {
00337 last_good_state = VERSION2;
00338 state = ERROR;
00339 }
00340 <span class="keywordflow">break</span>;
00341
00342 <span class="keywordflow">case</span> VERSEP2:
00343 <span class="keywordflow">if</span> (bufptr2 - buffer2 > 254) {
00344 last_good_state = state;
00345 state = ERROR;
00346 <span class="keywordflow">break</span>;
00347 }
00348
00349 *bufptr2 = last_char;
00350 bufptr2++;
00351
00352 <span class="keywordflow">if</span> (is_version_char(c)) {
00353 state = VERSION2;
00354 } <span class="keywordflow">else</span> {
00355 last_good_state = VERSION2;
00356 state = ERROR;
00357 }
00358 <span class="keywordflow">break</span>;
00359
00360 <span class="keywordflow">case</span> PAUSE2:
00361 <span class="keywordflow">if</span> (isspace(c)) {
00362 state = PAUSE2;
00363 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == <span class="charliteral">')'</span> || c == <span class="charliteral">']'</span>) {
00364 state = CLOSE;
00365 } <span class="keywordflow">else</span> {
00366 last_good_state = PAUSE2;
00367 state = ERROR;
00368 }
00369 <span class="keywordflow">break</span>;
00370
00371 <span class="keywordflow">case</span> CLOSE:
00372 *next = current;
00373
00374 <span class="keywordflow">if</span> (last_char == <span class="charliteral">')'</span>) {
00375 second_inclusive = 0;
00376 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (last_char == <span class="charliteral">']'</span>) {
00377 second_inclusive = 1;
00378 }
00379
00380 <span class="keywordflow">if</span> (version_compare(buffer1, buffer2) == 1) {
00381 *upper = _discover_xmalloc(bufptr1 - buffer1 + 1);
00382 strcpy(*upper, buffer1);
00383 *upper_inclusive = first_inclusive;
00384
00385 *lower = _discover_xmalloc(bufptr2 - buffer2 + 1);
00386 strcpy(*lower, buffer2);
00387 *lower_inclusive = second_inclusive;
00388 } <span class="keywordflow">else</span> {
00389 *lower = _discover_xmalloc(bufptr1 - buffer1 + 1);
00390 strcpy(*lower, buffer1);
00391 *lower_inclusive = first_inclusive;
00392
00393 *upper = _discover_xmalloc(bufptr2 - buffer2 + 1);
00394 strcpy(*upper, buffer2);
00395 *upper_inclusive = second_inclusive;
00396 }
00397
00398 <span class="comment">/* EXIT POINT */</span>
00399 <span class="keywordflow">return</span> 1;
00400
00401 <span class="keywordflow">default</span>:
00402 state = ERROR;
00403 last_good_state = -1;
00404 <span class="keywordflow">break</span>;
00405 }
00406
00407 <span class="keywordflow">if</span> (state == ERROR) {
00408 <span class="comment">/* Do something. */</span>
00409 <span class="keywordflow">return</span> 0;
00410 }
00411
00412 <span class="comment">/*</span>
00413 <span class="comment"> * We don't care about recording spaces; let's simplify by not</span>
00414 <span class="comment"> * doing so, in case we'd be missing something valuable.</span>
00415 <span class="comment"> */</span>
00416 <span class="keywordflow">if</span> (!isspace(*current)) {
00417 last_char = *current;
00418 }
00419
00420 current++;
00421 }
00422 }
00423
00437 <span class="keywordtype">int</span>
<a name="l00438"></a><a class="code" href="group__version__cmp.html#ga0">00438</a> <a class="code" href="group__version__cmp.html#ga0">discover_xml_version_cmp</a>(<span class="keywordtype">char</span> *range, <span class="keywordtype">char</span> *version, <a class="code" href="structdiscover__error.html">discover_error_t</a> *status)
00439 {
00440 <span class="keywordtype">char</span> *upper, *lower;
00441 <span class="keywordtype">int</span> upper_inclusive, lower_inclusive;
00442 <span class="keywordtype">char</span> *next_range;
00443 <span class="keywordtype">int</span> range_count = 0;
00444
00445 assert(range != NULL);
00446 assert(version != NULL);
00447 assert(status != NULL);
00448
00449 next_range = range;
00450
00451 <span class="keywordflow">while</span>(*next_range != <span class="charliteral">'\0'</span>) {
00452 range_count++;
00453 <span class="keywordflow">if</span> (determine_range(next_range, &upper, &upper_inclusive,
00454 &lower, &lower_inclusive, &next_range)) {
00455 <span class="comment">/*</span>
00456 <span class="comment"> * First test: Does this version match the upper end of the</span>
00457 <span class="comment"> * range exactly? If so, is the upper end of the range</span>
00458 <span class="comment"> * inclusive?</span>
00459 <span class="comment"> *</span>
00460 <span class="comment"> * Second test: Does this version match the lower end of the</span>
00461 <span class="comment"> * range? If so, is the lower end inclusive?</span>
00462 <span class="comment"> *</span>
00463 <span class="comment"> * Finally, is the version higher than the lower end, and lower</span>
00464 <span class="comment"> * then the upper end?</span>
00465 <span class="comment"> */</span>
00466 <span class="keywordflow">if</span> (version_compare(version, upper) == -1
00467 && upper_inclusive) {
00468 <span class="keywordflow">return</span> range_count;
00469 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (version_compare(version, lower) == -1
00470 && lower_inclusive) {
00471 <span class="keywordflow">return</span> range_count;
00472 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (version_compare(version, lower) > 0 &&
00473 version_compare(upper, version) > 0) {
00474 <span class="keywordflow">return</span> range_count;
00475 }
00476
00477 } <span class="keywordflow">else</span> {
00478 status-><a class="code" href="structdiscover__error.html#o0">code</a> = <a class="code" href="group__types.html#gga15a23">DISCOVER_EBADVERSION</a>;
00479 <span class="keywordflow">return</span> -1;
00480 }
00481 }
00482
00483 <span class="keywordflow">return</span> 0;
00484 }
00485
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Thu Jul 28 03:38:00 2005 for discover by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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