lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 70 insertions, 0 deletions

diff --git a/lib/mlibc/tests/posix/mkstemp.c b/lib/mlibc/tests/posix/mkstemp.c
new file mode 100644
index 0000000..d06783e
--- /dev/null
+++ b/lib/mlibc/tests/posix/mkstemp.c
@@ -0,0 +1,70 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+
+void validate_pattern(char *p) {
+	assert(memcmp(p, "XXXXXX", 6));
+	assert(memchr(p, 0, 6) == NULL);
+
+	for (int i = 0; i < 6; i++) {
+		assert(isalnum(p[i]));
+	}
+}
+
+int main() {
+	int ret;
+
+	// Make sure the patterns themselves cannot be chosen.  This
+	// *could* happen on glibc, or if we widen the character set
+	// used for generating random names. Odds are 1 in 60 billion,
+	// but I'd rather not worry about this.
+	ret = open("prefixXXXXXX", O_RDWR | O_CREAT | O_EXCL, 0600);
+	assert(ret >= 0 || (ret == -1 && errno == EEXIST));
+	ret = open("longprefixXXXXXXlongsuffix", O_RDWR | O_CREAT | O_EXCL, 0600);
+	assert(ret >= 0 || (ret == -1 && errno == EEXIST));
+
+	ret = mkstemp("short");
+	assert(ret == -1);
+	assert(errno == EINVAL);
+
+	ret = mkstemp("lessthan6XXX");
+	assert(ret == -1);
+	assert(errno == EINVAL);
+
+	ret = mkstemps("lessthan6XXXswithsuffix", 11);
+	assert(ret == -1);
+	assert(errno == EINVAL);
+
+	char *p = strdup("prefixXXXXXX");
+	ret = mkstemp(p);
+	// We can't really protect against EEXIST...
+	assert(ret >= 0 || (ret == -1 && errno == EEXIST));
+	assert(!memcmp(p, "prefix", 6));
+	assert(p[12] == 0);
+	validate_pattern(p + 6);
+
+	if (ret >= 0) {
+		ret = close(ret);
+		assert(!ret);
+	}
+	free(p);
+
+	p = strdup("longprefixXXXXXXlongsuffix");
+	ret = mkstemps(p, 10);
+	// We can't really protect against EEXIST...
+	assert(ret >= 0 || (ret == -1 && errno == EEXIST));
+	assert(!memcmp(p, "longprefix", 10));
+	assert(!memcmp(p + 16, "longsuffix", 10));
+	assert(p[26] == 0);
+	validate_pattern(p + 10);
+
+	if (ret >= 0) {
+		ret = close(ret);
+		assert(!ret);
+	}
+	free(p);
+}