pd.if.org Git - zpackage/blob - src/vercmp.c

   1 #define _POSIX_C_SOURCE 2
   2
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 #include <unistd.h>
   7
   8 #include "zpm.h"
   9
  10 /*
  11  * -g greater than
  12  * -l less than
  13  * -e equal
  14  * -L least : print least
  15  * -G greatest : print greatest
  16  * -q quiet: no print
  17  */
  18 int main(int ac, char *av[]) {
  19         int cmp;
  20         char *a = 0, *b = 0;
  21         int print = 1;
  22         int argn, opt = 0;
  23         int inorder = 1, equal = 1;
  24
  25         char *greatest = 0;
  26         char *least = 0;
  27
  28         while ((opt = getopt(ac, av, "qLG")) != -1) {
  29                 switch (opt) {
  30                         case 'q': print = 0; break;
  31                         case 'G': print = 2; break;
  32                         case 'L': print = 3; break;
  33                         default:
  34                                   exit(EXIT_FAILURE);
  35                                   break;
  36                 }
  37         }
  38
  39         argn = optind;
  40
  41         if (ac > argn) {
  42                 a = av[argn++];
  43                 greatest = a;
  44                 least = a;
  45         }
  46
  47         while (ac > argn) {
  48                 b = av[argn++];
  49
  50                 cmp = zpm_vercmp(a, b);
  51                 switch (cmp) {
  52                         case 0:
  53                                 break;
  54                         case -1:
  55                                 equal = 0;
  56                                 break;
  57                         case 1:
  58                                 equal = 0;
  59                                 inorder = 0;
  60                                 break;
  61                         default:
  62                                 break;
  63                 }
  64
  65                 cmp = zpm_vercmp(b, greatest);
  66                 if (cmp > 0) {
  67                         greatest = b;
  68                 }
  69
  70                 cmp = zpm_vercmp(b, least);
  71                 if (cmp < 0) {
  72                         least = b;
  73                 }
  74                 a = b;
  75         }
  76
  77         if (equal) {
  78                 cmp = 0;
  79         } else if (inorder) {
  80                 cmp = -1;
  81         } else {
  82                 cmp = 1;
  83         }
  84
  85         switch (print) {
  86                 case 1:
  87                         printf("%d\n", cmp);
  88                         break;
  89                 case 2:
  90                         if (greatest) printf("%s\n", greatest);
  91                         break;
  92                 case 3:
  93                         if (least) printf("%s\n", least);
  94                         break;
  95                 default:
  96                         break;
  97         }
  98
  99         return cmp == -1 ? 2 : cmp;
 100 }