tests/libc_test.c

   1 // Compare given libc name and version number to system name and version.
   2
   3 // Returns
   4 // - 0 if the libc name matches is at least the minimum version (if given).
   5 // - 1 if the libc name doesn't match or the version is lower than requested.
   6 // - 2 if the requested libc name isn't recognised.
   7 // - 3 if there was a usage error (it also prints an error message).
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 #ifdef __GLIBC__
  14 #include <gnu/libc-version.h>
  15 #endif
  16
  17 #define False  0
  18 #define True   1
  19 typedef int    Bool;
  20
  21 /* Assumes the versions are x.y.z, with y and z optional. */
  22 static __attribute__((unused)) Bool matches_version(char *min_version) {
  23    int a1=0, a2=0, a3=0, g1=0, g2=0, g3=0;  // 'a' = actual;  'g' = given
  24    const char *aversion;
  25
  26    if (min_version == NULL)  return True;  // no version specified
  27
  28    // get actual version number
  29 #ifdef __GLIBC__
  30    aversion = gnu_get_libc_version();
  31 #else
  32    aversion = "unknown";
  33 #endif
  34    // We expect at least one number.
  35    if (sscanf(aversion, "%d.%d.%d", &a1, &a2, &a3) < 1) return False;
  36
  37    // parse given version number.
  38    if (sscanf(min_version, "%d.%d.%d", &g1, &g2, &g3) < 1) return False;
  39
  40    if (a1 > g1) return True;
  41    if (a1 < g1) return False;
  42    if (a2 > g2) return True;
  43    if (a2 < g2) return False;
  44    if (a3 >= g3) return True;
  45
  46    return False;
  47 }
  48
  49 static Bool go(char* libc, char *min_version)
  50 {
  51 #ifdef __GLIBC__
  52    if ( 0 == strcmp( libc, "glibc" )
  53         && matches_version( min_version ))
  54       return True;
  55 #endif
  56
  57    return False;
  58 }
  59
  60 //---------------------------------------------------------------------------
  61 // main
  62 //---------------------------------------------------------------------------
  63 int main(int argc, char **argv)
  64 {
  65    if ( argc < 2 ) {
  66       fprintf( stderr, "usage: libc_test <libc-name> [<min-version>]\n" );
  67       exit(3);             // Usage error.
  68    }
  69    if (go( argv[1], argv[2] )) {
  70       return 0;            // Matched.
  71    }
  72
  73    if ( 0 == strcmp ( argv[1], "glibc" ) ) {
  74      return 1;             // Requested libc name known, but this isn't it.
  75                            // Or it wasn't the minimum requested version.
  76    }
  77    return 2;               // Didn't match any known libc name.
  78 }