| 1 | #define DISABLE_SIGN_COMPARE_WARNINGS |
| 2 | |
| 3 | #include "test-tool.h" |
| 4 | #include "git-compat-util.h" |
| 5 | |
| 6 | int cmd__genzeros(int argc, const char **argv) |
| 7 | { |
| 8 | /* static, so that it is NUL-initialized */ |
| 9 | static const char zeros[256 * 1024]; |
| 10 | intmax_t count; |
| 11 | ssize_t n; |
| 12 | |
| 13 | if (argc > 2) { |
| 14 | fprintf(stderr, "usage: %s [<count>]\n", argv[0]); |
| 15 | return 1; |
| 16 | } |
| 17 | |
| 18 | count = argc > 1 ? strtoimax(argv[1], NULL, 0) : -1; |
| 19 | |
| 20 | /* Writing out individual NUL bytes is slow... */ |
| 21 | while (count < 0) |
| 22 | if (xwrite(1, zeros, ARRAY_SIZE(zeros)) < 0) |
| 23 | die_errno("write error"); |
| 24 | |
| 25 | while (count > 0) { |
| 26 | n = xwrite(1, zeros, |
| 27 | count < ARRAY_SIZE(zeros) |
| 28 | ? count : ARRAY_SIZE(zeros)); |
| 29 | |
| 30 | if (n < 0) |
| 31 | die_errno("write error"); |
| 32 | |
| 33 | count -= n; |
| 34 | } |
| 35 | |
| 36 | return 0; |
| 37 | } |