git/git

#include "test-lib.h"
#include "strbuf.h"

/* wrapper that supplies tests with an empty, initialized strbuf */
static void setup(void (*f)(struct strbuf*, void*), void *data)
{
    struct strbuf buf = STRBUF_INIT;

    f(&buf, data);
    strbuf_release(&buf);
    check_uint(buf.len, ==, 0);
    check_uint(buf.alloc, ==, 0);
}

/* wrapper that supplies tests with a populated, initialized strbuf */
static void setup_populated(void (*f)(struct strbuf*, void*), char *init_str, void *data)
{
    struct strbuf buf = STRBUF_INIT;

    strbuf_addstr(&buf, init_str);
    check_uint(buf.len, ==, strlen(init_str));
    f(&buf, data);
    strbuf_release(&buf);
    check_uint(buf.len, ==, 0);
    check_uint(buf.alloc, ==, 0);
}

static int assert_sane_strbuf(struct strbuf *buf)
{
    /* Initialized strbufs should always have a non-NULL buffer */
    if (!check(!!buf->buf))
        return 0;
    /* Buffers should always be NUL-terminated */
    if (!check_char(buf->buf[buf->len], ==, '\0'))
        return 0;
    /*
     * Freshly-initialized strbufs may not have a dynamically allocated
     * buffer
     */
    if (buf->len == 0 && buf->alloc == 0)
        return 1;
    /* alloc must be at least one byte larger than len */
    return check_uint(buf->len, <, buf->alloc);
}

static void t_static_init(void)
{
    struct strbuf buf = STRBUF_INIT;

    check_uint(buf.len, ==, 0);
    check_uint(buf.alloc, ==, 0);
    check_char(buf.buf[0], ==, '\0');
}

static void t_dynamic_init(void)
{
    struct strbuf buf;

    strbuf_init(&buf, 1024);
    check(assert_sane_strbuf(&buf));
    check_uint(buf.len, ==, 0);
    check_uint(buf.alloc, >=, 1024);
    check_char(buf.buf[0], ==, '\0');
    strbuf_release(&buf);
}

static void t_addch(struct strbuf *buf, void *data)
{
    const char *p_ch = data;
    const char ch = *p_ch;
    size_t orig_alloc = buf->alloc;
    size_t orig_len = buf->len;

    if (!check(assert_sane_strbuf(buf)))
        return;
    strbuf_addch(buf, ch);
    if (!check(assert_sane_strbuf(buf)))
        return;
    if (!(check_uint(buf->len, ==, orig_len + 1) &&
          check_uint(buf->alloc, >=, orig_alloc)))
        return; /* avoid de-referencing buf->buf */
    check_char(buf->buf[buf->len - 1], ==, ch);
    check_char(buf->buf[buf->len], ==, '\0');
}

static void t_addstr(struct strbuf *buf, void *data)
{
    const char *text = data;
    size_t len = strlen(text);
    size_t orig_alloc = buf->alloc;
    size_t orig_len = buf->len;

    if (!check(assert_sane_strbuf(buf)))
        return;
    strbuf_addstr(buf, text);
    if (!check(assert_sane_strbuf(buf)))
        return;
    if (!(check_uint(buf->len, ==, orig_len + len) &&
          check_uint(buf->alloc, >=, orig_alloc) &&
          check_uint(buf->alloc, >, orig_len + len) &&
          check_char(buf->buf[orig_len + len], ==, '\0')))
        return;
    check_str(buf->buf + orig_len, text);
}

int cmd_main(int argc, const char **argv)
{
    if (!TEST(t_static_init(), "static initialization works"))
        test_skip_all("STRBUF_INIT is broken");
    TEST(t_dynamic_init(), "dynamic initialization works");
    TEST(setup(t_addch, "a"), "strbuf_addch adds char");
    TEST(setup(t_addch, ""), "strbuf_addch adds NUL char");
    TEST(setup_populated(t_addch, "initial value", "a"),
         "strbuf_addch appends to initial value");
    TEST(setup(t_addstr, "hello there"), "strbuf_addstr adds string");
    TEST(setup_populated(t_addstr, "initial value", "hello there"),
         "strbuf_addstr appends string to initial value");

    return test_done();
}