test/interactive-helper/rpmver.cc

   1 #include <apt-pkg/debversion.h>
   2 #include <rpm/rpmio.h>
   3 #include <rpm/misc.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <ctype.h>
   7
   8 #define xisdigit(x) isdigit(x)
   9 #define xisalpha(x) isalpha(x)
  10 #define xisalnum(x) (isdigit(x) || isalpha(x))
  11
  12 using namespace std;
  13
  14 int rpmvercmp(const char * a, const char * b)
  15 {
  16     char * str1, * str2;
  17     char * one, * two;
  18     int isnum;
  19
  20     /* easy comparison to see if versions are identical */
  21     if (!strcmp(a, b)) return 0;
  22
  23     str1 = (char *)alloca(strlen(a) + 1);
  24     str2 = (char *)alloca(strlen(b) + 1);
  25
  26     strcpy(str1, a);
  27     strcpy(str2, b);
  28
  29     one = str1;
  30     two = str2;
  31
  32     /* loop through each version segment of str1 and str2 and compare them */
  33     while (*one && *two) {
  34         while (*one && !xisalnum(*one)) one++;
  35         while (*two && !xisalnum(*two)) two++;
  36
  37         str1 = one;
  38         str2 = two;
  39
  40         /* grab first completely alpha or completely numeric segment */
  41         /* leave one and two pointing to the start of the alpha or numeric */
  42         /* segment and walk str1 and str2 to end of segment */
  43         if (xisdigit(*str1)) {
  44             while (*str1 && xisdigit(*str1)) str1++;
  45             while (*str2 && xisdigit(*str2)) str2++;
  46             isnum = 1;
  47         } else {
  48             while (*str1 && xisalpha(*str1)) str1++;
  49             while (*str2 && xisalpha(*str2)) str2++;
  50             isnum = 0;
  51         }
  52
  53         /* save character at the end of the alpha or numeric segment */
  54         /* so that they can be restored after the comparison */
  55         char oldch1 = *str1;
  56         *str1 = '\0';
  57         char oldch2 = *str2;
  58         *str2 = '\0';
  59
  60         /* take care of the case where the two version segments are */
  61         /* different types: one numeric, the other alpha (i.e. empty) */
  62         if (one == str1) return -1;     /* arbitrary */
  63         if (two == str2) return 1;
  64
  65         if (isnum) {
  66             /* this used to be done by converting the digit segments */
  67             /* to ints using atoi() - it's changed because long  */
  68             /* digit segments can overflow an int - this should fix that. */
  69
  70             /* throw away any leading zeros - it's a number, right? */
  71             while (*one == '0') one++;
  72             while (*two == '0') two++;
  73
  74             /* whichever number has more digits wins */
  75             if (strlen(one) > strlen(two)) return 1;
  76             if (strlen(two) > strlen(one)) return -1;
  77         }
  78
  79         /* strcmp will return which one is greater - even if the two */
  80         /* segments are alpha or if they are numeric.  don't return  */
  81         /* if they are equal because there might be more segments to */
  82         /* compare */
  83         int rc = strcmp(one, two);
  84         if (rc) return rc;
  85
  86         /* restore character that was replaced by null above */
  87         *str1 = oldch1;
  88         one = str1;
  89         *str2 = oldch2;
  90         two = str2;
  91     }
  92
  93     /* this catches the case where all numeric and alpha segments have */
  94     /* compared identically but the segment sepparating characters were */
  95     /* different */
  96     if ((!*one) && (!*two)) return 0;
  97
  98     /* whichever version still has characters left over wins */
  99     if (!*one) return -1; else return 1;
 100 }
 101
 102 int main(int argc,const char *argv[])
 103 {
 104    printf("%i\n",strcmp(argv[1],argv[2]));
 105
 106    printf("'%s' <> '%s':  ",argv[1],argv[2]);
 107    printf("rpm: %i   deb:  %i\n",rpmvercmp(argv[1],argv[2]),
 108           debVS.CmpFragment(argv[1],argv[1]+strlen(argv[1]),
 109                             argv[2],argv[2]+strlen(argv[2])));
 110
 111    printf("'%s' <> '%s':  ",argv[2],argv[1]);
 112    printf("rpm: %i   deb:  %i\n",rpmvercmp(argv[2],argv[1]),
 113           debVS.CmpFragment(argv[2],argv[2]+strlen(argv[2]),
 114                             argv[1],argv[1]+strlen(argv[1])));
 115    return 0;
 116 }