1 files changed, 131 insertions, 0 deletions
diff --git a/tests/getc.c b/tests/getc.c
new file mode 100644
index 0000000..ef3b860
--- /dev/null
+++ b/tests/getc.c
@@ -0,0 +1,131 @@
+int g_passed = 0;
+int g_failed = 0;
+
+int getc() {
+    char c;
+    int n = syscall(0, 0, &c, 1);
+    if (n <= 0) return -1;
+    return (int)c;
+}
+
+int write_char(int c) {
+    char b;
+    b = (char)c;
+    syscall(1, 1, &b, 1);
+    return 1;
+}
+
+int write_str(char *s) {
+    int n = 0;
+    while (s[n] != 0) n++;
+    syscall(1, 1, s, n);
+    return n;
+}
+
+int write_int(int n) {
+    char tmp[24];
+    int len = 0;
+    int neg = n < 0;
+    if (neg) { write_char('-'); n = -n; }
+    if (n == 0) { write_char('0'); return 1; }
+    while (n > 0) { tmp[len] = (char)('0' + n % 10); n = n / 10; len++; }
+    int i = len - 1;
+    while (i >= 0) { write_char(tmp[i]); i--; }
+    return neg + len;
+}
+
+int check(char *name, int got, int want) {
+    if (got == want) {
+        write_str("PASS "); write_str(name); write_char('\n');
+        g_passed++;
+        return 1;
+    }
+    write_str("FAIL "); write_str(name);
+    write_str(": got "); write_int(got);
+    write_str(" want "); write_int(want);
+    write_char('\n');
+    g_failed++;
+    return 0;
+}
+
+int read_line(char *buf, int cap) {
+    int i = 0;
+    int c;
+    while (i < cap - 1) {
+        c = getc();
+        if (c == -1 || c == '\n') break;
+        buf[i] = (char)c;
+        i++;
+    }
+    buf[i] = 0;
+    return i;
+}
+
+int test1() {
+    int c = getc();
+    int result = c;
+    while (c != '\n' && c != -1) c = getc();
+    return check("single_char_is_65", result, 65);
+}
+
+int test2() {
+    char buf[64];
+    int n = read_line(buf, 64);
+    write_str(buf); write_char('\n');
+    return check("readline_length", n, 5);
+}
+
+int test3() {
+    int newlines = 0;
+    int c;
+    while (newlines < 2) {
+        c = getc();
+        if (c == -1) break;
+        if (c == '\n') newlines++;
+    }
+    return check("count_lines", newlines, 2);
+}
+
+int test4() {
+    int value = 0;
+    int c;
+    while (1) {
+        c = getc();
+        if (c < '0' || c > '9') break;
+        value = value * 10 + (c - '0');
+    }
+    return check("parse_int", value, 42);
+}
+
+int test5() {
+    char buf[64];
+    int n = read_line(buf, 64);
+    int i = 0;
+    while (i < n) {
+        char ch = buf[i];
+        if (ch >= 'a' && ch <= 'z') buf[i] = ch - 'a' + 'A';
+        i++;
+    }
+    write_str(buf); write_char('\n');
+    return check("toupper_length", n, 5);
+}
+
+int test6() {
+    int c = getc();
+    return check("eof_is_minus1", c, -1);
+}
+
+int main() {
+    test1();
+    test2();
+    test3();
+    test4();
+    test5();
+    test6();
+
+    write_char('\n');
+    write_int(g_passed); write_str(" passed, ");
+    write_int(g_failed); write_str(" failed\n");
+
+    return g_failed == 0 ? 0 : 1;
+}