#include <stdlib.h>

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include <string.h>

#include "test.h"

#define TEST(r, f, x, m) ( \

((r) = (f)) == (x) || \

(error("%s failed (" m ")\n", #f, r, x), 0) )

#define TEST_E(f) ( (errno = 0), (f) || \

(error("%s failed (errno = %d)\n", #f, errno), 0) )

#define TEST_S(s, x, m) ( \

!strcmp((s),(x)) || \

(error("[%s] != [%s] (%s)\n", s, x, m), 0) )

#define TEST_M(s, x, n, m) ( \

!memcmp((s),(x),(n)) || \

(error("[%s] != [%s] (%s)\n", s, x, m), 0) )

void test_memstream(void)

{

	FILE *f;

	char *s;

	size_t l;

	char buf[100];

	int i;

	s = 0;

	TEST_E(f = open_memstream(&s, &l);;

	TEST_E(putc('a', f) == 'a');

	TEST_E(putc('b', f) == 'b');

	TEST_E(putc('c', f) == 'c');

	TEST_E(!fflush(f));

	fclose(f);

	if (s) TEST_S(s, "abc", "wrong output");

	free(s);

	s = 0;

	TEST_E(f = open_memstream(&s, &l);;

	TEST_E(fseek(f,1,SEEK_CUR)>=0);

	TEST_E(putc('q', f) == 'q');

	TEST_E(!fflush(f));

	if (s) TEST_M(s, "\0q", 3, "wrong output");

	TEST(i, fseek(f,-3,SEEK_CUR), -1, "invalid seek allowed");

	TEST(i, errno, EINVAL, "%d != %d");

	TEST(i, ftell(f), 2, "%d != %d");

	TEST_E(fseek(f,-2,SEEK_CUR)>=0);

	TEST_E(putc('e', f) == 'e');

	TEST_E(!fflush(f));

	if (s) TEST_S(s, "eq", "wrong output");

	fclose(f);

	free(s);

	TEST_E(f = fmemopen(buf, 10, "r+"));

	TEST_E(fputs("hello", f) >= 0);

	TEST_E(fputc(0, f)==0);

	TEST_E(fseek(f, 0, SEEK_SET)>=0);

	i=0;

	TEST_E(fscanf(f, "hello%n", &i)==0);

	TEST(i, i, 5, "%d != %d");

	TEST(i, ftell(f), 5, "%d != %d");

	errno = 0;

	TEST(i, fseek(f, 6, SEEK_CUR)<0, 1, "");

	TEST(i, errno!=0, 1, "");

	TEST(i, ftell(f), 5, "%d != %d");

	TEST_S(buf, "hello", "");

	fclose(f);

	TEST_E(f = fmemopen(buf, 10, "a+"));

	TEST(i, ftell(f), 5, "%d != %d");

	TEST_E(fseek(f, 0, SEEK_SET)>=0);

	TEST(i, getc(f), 'h', "%d != %d");

	TEST(i, getc(f), 'e', "%d != %d");

	TEST(i, getc(f), 'l', "%d != %d");

	TEST(i, getc(f), 'l', "%d != %d");

	TEST(i, getc(f), 'o', "%d != %d");

	TEST(i, getc(f), EOF, "%d != %d");

	TEST_E(fseek(f, 6, SEEK_SET)>=0);

	TEST(i, ftell(f), 6, "%d != %d");

	TEST(i, getc(f), EOF, "%d != %d");

	TEST(i, ftell(f), 6, "%d != %d");

	TEST_E(fseek(f, 0, SEEK_SET)>=0);

	TEST(i, getc(f), 'h', "%d != %d");

	TEST_E(fseek(f, 0, SEEK_CUR)>=0);

	buf[7] = 'x';

	TEST_E(fprintf(f, "%d", i)==3);

	TEST_E(fflush(f)==0);

	TEST(i, ftell(f), 8, "%d != %d");

	TEST_S(buf, "hello104", "");

	fclose(f);

}