Elliott Hughes | ed39800 | 2017-06-21 14:41:24 -0700 | [diff] [blame] | 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 | } |