static void test_sc_string_append_char__normal()
{
char buf[16];
size_t len;
sc_string_init(buf, sizeof buf);
len = sc_string_append_char(buf, sizeof buf, 'h');
g_assert_cmpstr(buf, ==, "h");
g_assert_cmpint(len, ==, 1);
len = sc_string_append_char(buf, sizeof buf, 'e');
g_assert_cmpstr(buf, ==, "he");
g_assert_cmpint(len, ==, 2);
len = sc_string_append_char(buf, sizeof buf, 'l');
g_assert_cmpstr(buf, ==, "hel");
g_assert_cmpint(len, ==, 3);
len = sc_string_append_char(buf, sizeof buf, 'l');
g_assert_cmpstr(buf, ==, "hell");
g_assert_cmpint(len, ==, 4);
len = sc_string_append_char(buf, sizeof buf, 'o');
g_assert_cmpstr(buf, ==, "hello");
g_assert_cmpint(len, ==, 5);
}
static void test_sc_string_append_char__NULL_buf()
{
if (g_test_subprocess()) {
sc_string_append_char(NULL, 2, 'a');
g_test_message("expected sc_string_append_char not to return");
g_test_fail();
return;
}
g_test_trap_subprocess(NULL, 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stderr("cannot append character: buffer is NULL\n");
}
static void test_sc_string_append_char__invalid_zero()
{
if (g_test_subprocess()) {
char buf[2] = { 0 };
sc_string_append_char(buf, sizeof buf, '\0');
g_test_message("expected sc_string_append_char not to return");
g_test_fail();
return;
}
g_test_trap_subprocess(NULL, 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stderr
("cannot append character: cannot append string terminator\n");
}
static void test_sc_string_append_char__overflow()
{
if (g_test_subprocess()) {
char buf[1] = { 0 };
sc_string_append_char(buf, sizeof buf, 'a');
g_test_message("expected sc_string_append_char not to return");
g_test_fail();
return;
}
g_test_trap_subprocess(NULL, 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stderr
("cannot append character: not enough space\n");
}
static void test_sc_string_append_char__uninitialized_buf()
{
if (g_test_subprocess()) {
char buf[2] = { 0xFF, 0xFF };
sc_string_append_char(buf, sizeof buf, 'a');
g_test_message("expected sc_string_append_char not to return");
g_test_fail();
return;
}
g_test_trap_subprocess(NULL, 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stderr
("cannot append character: dst is unterminated\n");
}
void sc_string_quote(char *buf, size_t buf_size, const char *str)
{
if (str == NULL) {
die("cannot quote string: string is NULL");
}
const char *hex = "0123456789abcdef";
// NOTE: this also checks buf/buf_size sanity so that we don't have to.
sc_string_init(buf, buf_size);
sc_string_append_char(buf, buf_size, '"');
for (unsigned char c; (c = *str) != 0; ++str) {
switch (c) {
// Pass ASCII letters and digits unmodified.
case '0' ... '9':
case 'A' ... 'Z':
case 'a' ... 'z':
// Pass most of the punctuation unmodified.
case ' ':
case '!':
case '#':
case '$':
case '%':
case '&':
case '(':
case ')':
case '*':
case '+':
case ',':
case '-':
case '.':
case '/':
case ':':
case ';':
case '<':
case '=':
case '>':
case '?':
case '@':
case '[':
case '\'':
case ']':
case '^':
case '_':
case '`':
case '{':
case '|':
case '}':
case '~':
sc_string_append_char(buf, buf_size, c);
break;
// Escape special whitespace characters.
case '\n':
sc_string_append_char_pair(buf, buf_size, '\\', 'n');
break;
case '\r':
sc_string_append_char_pair(buf, buf_size, '\\', 'r');
break;
case '\t':
sc_string_append_char_pair(buf, buf_size, '\\', 't');
break;
case '\v':
sc_string_append_char_pair(buf, buf_size, '\\', 'v');
break;
// Escape the escape character.
case '\\':
sc_string_append_char_pair(buf, buf_size, '\\', '\\');
break;
// Escape double quote character.
case '"':
sc_string_append_char_pair(buf, buf_size, '\\', '"');
break;
// Escape everything else as a generic hexadecimal escape string.
default:
sc_string_append_char_pair(buf, buf_size, '\\', 'x');
sc_string_append_char_pair(buf, buf_size, hex[c >> 4],
hex[c & 15]);
break;
}
}
sc_string_append_char(buf, buf_size, '"');
}
