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 <ctype.h>
   6
   7 #define xisdigit(x) isdigit(x)
   8 #define xisalpha(x) isalpha(x)
   9 #define xisalnum(x) (isdigit(x) || isalpha(x))
  10
  11 using namespace std;
  12
  13 int rpmvercmp(const char * a, const char * b)
  14 {
  15     char oldch1, oldch2;
  16     char * str1, * str2;
  17     char * one, * two;
  18     int rc;
  19     int isnum;
  20
  21     /* easy comparison to see if versions are identical */
  22     if (!strcmp(a, b)) return 0;
  23
  24     str1 = (char *)alloca(strlen(a) + 1);
  25     str2 = (char *)alloca(strlen(b) + 1);
  26
  27     strcpy(str1, a);
  28     strcpy(str2, b);
  29
  30     one = str1;
  31     two = str2;
  32
  33     /* loop through each version segment of str1 and str2 and compare them */
  34     while (*one && *two) {
  35         while (*one && !xisalnum(*one)) one++;
  36         while (*two && !xisalnum(*two)) two++;
  37
  38         str1 = one;
  39         str2 = two;
  40
  41         /* grab first completely alpha or completely numeric segment */
  42         /* leave one and two pointing to the start of the alpha or numeric */
  43         /* segment and walk str1 and str2 to end of segment */
  44         if (xisdigit(*str1)) {
  45             while (*str1 && xisdigit(*str1)) str1++;
  46             while (*str2 && xisdigit(*str2)) str2++;
  47             isnum = 1;
  48         } else {
  49             while (*str1 && xisalpha(*str1)) str1++;
  50             while (*str2 && xisalpha(*str2)) str2++;
  51             isnum = 0;
  52         }
  53
  54         /* save character at the end of the alpha or numeric segment */
  55         /* so that they can be restored after the comparison */
  56         oldch1 = *str1;
  57         *str1 = '\0';
  58         oldch2 = *str2;
  59         *str2 = '\0';
  60
  61         /* take care of the case where the two version segments are */
  62         /* different types: one numeric, the other alpha (i.e. empty) */
  63         if (one == str1) return -1;     /* arbitrary */
  64         if (two == str2) return 1;
  65
  66         if (isnum) {
  67             /* this used to be done by converting the digit segments */
  68             /* to ints using atoi() - it's changed because long  */
  69             /* digit segments can overflow an int - this should fix that. */
  70
  71             /* throw away any leading zeros - it's a number, right? */
  72             while (*one == '0') one++;
  73             while (*two == '0') two++;
  74
  75             /* whichever number has more digits wins */
  76             if (strlen(one) > strlen(two)) return 1;
  77             if (strlen(two) > strlen(one)) return -1;
  78         }
  79
  80         /* strcmp will return which one is greater - even if the two */
  81         /* segments are alpha or if they are numeric.  don't return  */
  82         /* if they are equal because there might be more segments to */
  83         /* compare */
  84         rc = strcmp(one, two);
  85         if (rc) return rc;
  86
  87         /* restore character that was replaced by null above */
  88         *str1 = oldch1;
  89         one = str1;
  90         *str2 = oldch2;
  91         two = str2;
  92     }
  93
  94     /* this catches the case where all numeric and alpha segments have */
  95     /* compared identically but the segment sepparating characters were */
  96     /* different */
  97     if ((!*one) && (!*two)) return 0;
  98
  99     /* whichever version still has characters left over wins */
 100     if (!*one) return -1; else return 1;
 101 }
 102
 103 int main(int argc,const char *argv[])
 104 {
 105    printf("%i\n",strcmp(argv[1],argv[2]));
 106
 107    printf("'%s' <> '%s':  ",argv[1],argv[2]);
 108    printf("rpm: %i   deb:  %i\n",rpmvercmp(argv[1],argv[2]),
 109           debVS.CmpFragment(argv[1],argv[1]+strlen(argv[1]),
 110                             argv[2],argv[2]+strlen(argv[2])));
 111
 112    printf("'%s' <> '%s':  ",argv[2],argv[1]);
 113    printf("rpm: %i   deb:  %i\n",rpmvercmp(argv[2],argv[1]),
 114           debVS.CmpFragment(argv[2],argv[2]+strlen(argv[2]),
 115                             argv[1],argv[1]+strlen(argv[1])));
 116    return 0;
 117 }