external/bsd/pkg_install/dist/lib/dewey.c

   1 /* $NetBSD: dewey.c,v 1.1.1.3 2009/03/08 14:51:37 joerg Exp $ */
   2
   3 /*
   4  * Copyright © 2002 Alistair G. Crooks.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote
  15  *    products derived from this software without specific prior written
  16  *    permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  24  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #if HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34 #include <nbcompat.h>
  35
  36 #if HAVE_CTYPE_H
  37 #include <ctype.h>
  38 #endif
  39 #if HAVE_STDLIB_H
  40 #include <stdlib.h>
  41 #endif
  42
  43 #include "defs.h"
  44 #include "dewey.h"
  45
  46 #define PKG_PATTERN_MAX 1024
  47
  48 /* do not modify these values, or things will NOT work */
  49 enum {
  50         Alpha = -3,
  51         Beta = -2,
  52         RC = -1,
  53         Dot = 0,
  54         Patch = 1
  55 };
  56
  57 /* this struct defines a version number */
  58 typedef struct arr_t {
  59         unsigned        c;              /* # of version numbers */
  60         unsigned        size;           /* size of array */
  61         int            *v;              /* array of decimal numbers */
  62         int             netbsd;         /* any "nb" suffix */
  63 } arr_t;
  64
  65 /* this struct describes a test */
  66 typedef struct test_t {
  67         const char     *s;              /* string representation */
  68         unsigned        len;            /* length of string */
  69         int             t;              /* enumerated type of test */
  70 } test_t;
  71
  72
  73 /* the tests that are recognised. */
  74  const test_t   tests[] = {
  75         {       "<=",   2,      DEWEY_LE        },
  76         {       "<",    1,      DEWEY_LT        },
  77         {       ">=",   2,      DEWEY_GE        },
  78         {       ">",    1,      DEWEY_GT        },
  79         {       "==",   2,      DEWEY_EQ        },
  80         {       "!=",   2,      DEWEY_NE        },
  81         {       NULL,   0,      0       }
  82 };
  83
  84  const test_t   modifiers[] = {
  85         {       "alpha",        5,      Alpha   },
  86         {       "beta",         4,      Beta    },
  87         {       "pre",          3,      RC      },
  88         {       "rc",           2,      RC      },
  89         {       "pl",           2,      Dot     },
  90         {       "_",            1,      Dot     },
  91         {       ".",            1,      Dot     },
  92         {       NULL,           0,      0       }
  93 };
  94
  95
  96
  97 /* locate the test in the tests array */
  98 int
  99 dewey_mktest(int *op, const char *test)
 100 {
 101         const test_t *tp;
 102
 103         for (tp = tests ; tp->s ; tp++) {
 104                 if (strncasecmp(test, tp->s, tp->len) == 0) {
 105                         *op = tp->t;
 106                         return tp->len;
 107                 }
 108         }
 109         return -1;
 110 }
 111
 112 /*
 113  * make a component of a version number.
 114  * '.' encodes as Dot which is '0'
 115  * '_' encodes as 'patch level', or 'Dot', which is 0.
 116  * 'pl' encodes as 'patch level', or 'Dot', which is 0.
 117  * 'alpha' encodes as 'alpha version', or Alpha, which is -3.
 118  * 'beta' encodes as 'beta version', or Beta, which is -2.
 119  * 'rc' encodes as 'release candidate', or RC, which is -1.
 120  * 'nb' encodes as 'netbsd version', which is used after all other tests
 121  */
 122 static int
 123 mkcomponent(arr_t *ap, const char *num)
 124 {
 125         static const char       alphas[] = "abcdefghijklmnopqrstuvwxyz";
 126         const test_t           *modp;
 127         int                 n;
 128         const char             *cp;
 129
 130         if (ap->c == ap->size) {
 131                 if (ap->size == 0) {
 132                         ap->size = 62;
 133                         if ((ap->v = malloc(ap->size * sizeof(int))) == NULL)
 134                                 err(EXIT_FAILURE, "mkver malloc failed");
 135                 } else {
 136                         ap->size *= 2;
 137                         if ((ap->v = realloc(ap->v, ap->size * sizeof(int)))
 138                             == NULL)
 139                                 err(EXIT_FAILURE, "mkver realloc failed");
 140                 }
 141         }
 142         if (isdigit((unsigned char)*num)) {
 143                 for (cp = num, n = 0 ; isdigit((unsigned char)*num) ; num++) {
 144                         n = (n * 10) + (*num - '0');
 145                 }
 146                 ap->v[ap->c++] = n;
 147                 return (int)(num - cp);
 148         }
 149         for (modp = modifiers ; modp->s ; modp++) {
 150                 if (strncasecmp(num, modp->s, modp->len) == 0) {
 151                         ap->v[ap->c++] = modp->t;
 152                         return modp->len;
 153                 }
 154         }
 155         if (strncasecmp(num, "nb", 2) == 0) {
 156                 for (cp = num, num += 2, n = 0 ; isdigit((unsigned char)*num) ; num++) {
 157                         n = (n * 10) + (*num - '0');
 158                 }
 159                 ap->netbsd = n;
 160                 return (int)(num - cp);
 161         }
 162         if (isalpha((unsigned char)*num)) {
 163                 ap->v[ap->c++] = Dot;
 164                 cp = strchr(alphas, tolower((unsigned char)*num));
 165                 if (ap->c == ap->size) {
 166                         ap->size *= 2;
 167                         if ((ap->v = realloc(ap->v, ap->size * sizeof(int))) == NULL)
 168                                 err(EXIT_FAILURE, "mkver realloc failed");
 169                 }
 170                 ap->v[ap->c++] = (int)(cp - alphas) + 1;
 171                 return 1;
 172         }
 173         return 1;
 174 }
 175
 176 /* make a version number string into an array of comparable ints */
 177 static int
 178 mkversion(arr_t *ap, const char *num)
 179 {
 180         ap->c = 0;
 181         ap->size = 0;
 182         ap->v = NULL;
 183         ap->netbsd = 0;
 184
 185         while (*num) {
 186                 num += mkcomponent(ap, num);
 187         }
 188         return 1;
 189 }
 190
 191 static void
 192 freeversion(arr_t *ap)
 193 {
 194         free(ap->v);
 195         ap->v = NULL;
 196         ap->c = 0;
 197         ap->size = 0;
 198 }
 199
 200 #define DIGIT(v, c, n) (((n) < (c)) ? v[n] : 0)
 201
 202 /* compare the result against the test we were expecting */
 203 static int
 204 result(int cmp, int tst)
 205 {
 206         switch(tst) {
 207         case DEWEY_LT:
 208                 return cmp < 0;
 209         case DEWEY_LE:
 210                 return cmp <= 0;
 211         case DEWEY_GT:
 212                 return cmp > 0;
 213         case DEWEY_GE:
 214                 return cmp >= 0;
 215         case DEWEY_EQ:
 216                 return cmp == 0;
 217         case DEWEY_NE:
 218                 return cmp != 0;
 219         default:
 220                 return 0;
 221         }
 222 }
 223
 224 /* do the test on the 2 vectors */
 225 static int
 226 vtest(arr_t *lhs, int tst, arr_t *rhs)
 227 {
 228         int cmp;
 229         unsigned int c, i;
 230
 231         for (i = 0, c = MAX(lhs->c, rhs->c) ; i < c ; i++) {
 232                 if ((cmp = DIGIT(lhs->v, lhs->c, i) - DIGIT(rhs->v, rhs->c, i)) != 0) {
 233                         return result(cmp, tst);
 234                 }
 235         }
 236         return result(lhs->netbsd - rhs->netbsd, tst);
 237 }
 238
 239 /*
 240  * Compare two dewey decimal numbers
 241  */
 242 int
 243 dewey_cmp(const char *lhs, int op, const char *rhs)
 244 {
 245         arr_t   right;
 246         arr_t   left;
 247         int retval;
 248
 249         if (!mkversion(&left, lhs))
 250                 return 0;
 251         if (!mkversion(&right, rhs)) {
 252                 freeversion(&left);
 253                 return 0;
 254         }
 255         retval = vtest(&left, op, &right);
 256         freeversion(&left);
 257         freeversion(&right);
 258         return retval;
 259 }
 260
 261 /*
 262  * Perform dewey match on "pkg" against "pattern".
 263  * Return 1 on match, 0 on non-match, -1 on error.
 264  */
 265 int
 266 dewey_match(const char *pattern, const char *pkg)
 267 {
 268         const char *version;
 269         const char *sep, *sep2;
 270         int op, op2;
 271         int n;
 272
 273         /* compare names */
 274         if ((version=strrchr(pkg, '-')) == NULL) {
 275                 return 0;
 276         }
 277         if ((sep = strpbrk(pattern, "<>")) == NULL)
 278                 return -1;
 279         /* compare name lengths */
 280         if ((sep-pattern != version-pkg) ||
 281             strncmp(pkg, pattern, (size_t)(version-pkg)) != 0)
 282                 return 0;
 283         version++;
 284
 285         /* extract comparison operator */
 286         if ((n = dewey_mktest(&op, sep)) < 0) {
 287                 return 0;
 288         }
 289         /* skip operator */
 290         sep += n;
 291
 292         /* if greater than, look for less than */
 293         sep2 = NULL;
 294         if (op == DEWEY_GT || op == DEWEY_GE) {
 295                 if ((sep2 = strchr(sep, '<')) != NULL) {
 296                         if ((n = dewey_mktest(&op2, sep2)) < 0) {
 297                                 return 0;
 298                         }
 299                         /* compare upper limit */
 300                         if (!dewey_cmp(version, op2, sep2+n))
 301                                 return 0;
 302                 }
 303         }
 304
 305         /* compare only pattern / lower limit */
 306         if (sep2) {
 307                 char ver[PKG_PATTERN_MAX];
 308
 309                 strlcpy(ver, sep, MIN((ssize_t)sizeof(ver), sep2-sep+1));
 310                 if (dewey_cmp(version, op, ver))
 311                         return 1;
 312         }
 313         else {
 314                 if (dewey_cmp(version, op, sep))
 315                         return 1;
 316         }
 317
 318         return 0;
 319 }
 320