diff options
Diffstat (limited to 'string/tester.c')
| -rw-r--r-- | string/tester.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/string/tester.c b/string/tester.c index 34d4e1c8e0..d826ff7beb 100644 --- a/string/tester.c +++ b/string/tester.c @@ -375,6 +375,7 @@ DEFUN(main, (argc, argv), int argc AND char **argv) check(memchr("abcd", 'z', 4) == NULL, 1); /* Not found. */ (void) strcpy(one, "abcd"); check(memchr(one, 'c', 4) == one+2, 2); /* Basic test. */ + check(memchr(one, ~0xff|'c', 4) == one+2, 2); /* ignore highorder bits. */ check(memchr(one, 'd', 4) == one+3, 3); /* End of string. */ check(memchr(one, 'a', 4) == one, 4); /* Beginning. */ check(memchr(one, '\0', 5) == one+4, 5); /* Finding NUL. */ @@ -385,6 +386,30 @@ DEFUN(main, (argc, argv), int argc AND char **argv) (void) strcpy(one, "a\203b"); check(memchr(one, 0203, 3) == one+1, 9); /* Unsignedness. */ + /* now test all possible alignment and length combinations to catch + bugs due to unrolled loops (assuming unrolling is limited to no + more than 128 byte chunks: */ + { + char buf[128 + sizeof(long)]; + long align, len, i, pos; + + for (align = 0; align < sizeof(long); ++align) { + for (len = 0; len < sizeof(buf) - align; ++len) { + for (i = 0; i < len; ++i) { + buf[align + i] = 'x'; /* don't depend on memset... */ + } + for (pos = 0; pos < len; ++pos) { +#if 0 + printf("align %d, len %d, pos %d\n", align, len, pos); +#endif + check(memchr(buf + align, 'x', len) == buf + align + pos, 10); + check(memchr(buf + align, 'x', pos) == NULL, 11); + buf[align + pos] = '-'; + } + } + } + } + /* memcpy - need not work for overlap. */ it = "memcpy"; check(memcpy(one, "abc", 4) == one, 1); /* Returned value. */ |