add remaining tests from libc-testsuit

[libc-test] / src / stdio / ungetc.c

diff --git a/src/stdio/ungetc.c b/src/stdio/ungetc.c
new file mode 100644 (file)
index 0000000..855ffaa
--- /dev/null
+++ b/src/stdio/ungetc.c
@@ -0,0 +1,52 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include "test.h"
+
+#define TEST(r, f, x, m) ( \
+       errno = 0, ((r) = (f)) == (x) || \
+       (error("%s failed (" m ")\n", #f, r, x, strerror(errno)), 0) )
+
+#define TEST_S(s, x, m) ( \
+       !strcmp((s),(x)) || \
+       (error("[%s] != [%s] (%s)\n", s, x, m), 0) )
+
+void test_ungetc(void) {
+       int i;
+       char a[100];
+       FILE *f;
+
+       TEST(i, !(f = tmpfile()), 0, "failed to create temp file %d!=%d (%s)");
+
+       if (!f) return;
+
+       TEST(i, fprintf(f, "hello, world\n"), 13, "%d != %d (%m)");
+       TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d (%m)");
+
+       TEST(i, feof(f), 0, "%d != %d");
+       TEST(i, fgetc(f), 'h', "'%c' != '%c'");
+       TEST(i, ftell(f), 1, "%d != %d");
+       TEST(i, ungetc('x', f), 'x', "%d != %d");
+       TEST(i, ftell(f), 0, "%d != %d");
+       TEST(i, fscanf(f, "%[h]", a), 0, "got %d fields, expected %d");
+       TEST(i, ftell(f), 0, "%d != %d");
+       TEST(i, fgetc(f), 'x', "'%c' != '%c'");
+       TEST(i, ftell(f), 1, "%d != %d");
+
+       TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d");
+       TEST(i, ungetc('x', f), 'x', "%d != %d");
+       TEST(i, fread(a, 1, sizeof a, f), 14, "read %d, expected %d");
+       a[14] = 0;
+       TEST_S(a, "xhello, world\n", "mismatch reading ungot character");
+
+       TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d");
+       TEST(i, fscanf(f, "%[x]", a), 0, "got %d fields, expected %d");
+       TEST(i, ungetc('x', f), 'x', "unget failed after fscanf: %d != %d");
+       TEST(i, fgetc(f), 'x', "'%c' != '%c'");
+       TEST(i, fgetc(f), 'h', "'%c' != '%c'");
+
+       fclose(f);
+}