kolibrios/programs/develop/ktcc/trunk/libctest/ungetc.c
siemargl 524cab3cd8 added read buffering, ungetc
git-svn-id: svn://kolibrios.org@7184 a494cfbc-eb01-0410-851d-a64ba20cac60
2018-03-12 20:41:06 +00:00

115 lines
2.4 KiB
C

#include <stdio.h>
#include <stdlib.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) || \
(t_error("%s failed (" m ")\n", #f, r, x, strerror(errno)), 0) )
#define TEST_S(s, x, m) ( \
!strcmp((s),(x)) || \
(t_error("[%s] != [%s] (%s)\n", s, x, m), 0) )
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <kolibrisys.h>
#define fgetc fgetc_dbg
#define ungetc ungetc_dbg
int fgetc_dbg(FILE* file)
{
int c = 0, rc;
rc = fread(&c, 1, 1, file);
if (rc < 1) return EOF;
return c;
}
int ungetc_dbg(int c,FILE* file)
{
dword res;
if(!file)
{
errno = E_INVALIDPTR;
return EOF;
}
if ((file->mode & 3!=FILE_OPEN_READ) && (file->mode & FILE_OPEN_PLUS==0))
{
errno = E_ACCESS;
return EOF;
}
if (file->filepos>file->filesize || file->filepos==0 || c == EOF || file->ungetc_buf != EOF)
{
errno = E_EOF;
return EOF;
}
file->ungetc_buf = c;
file->filepos--;
return c;
}
void mark(int n)
{
n++;
}
int main(void)
{
int i;
char a[100];
FILE *f;
TEST(i, !(f = fopen("_tmpfile.tmp","w+")), 0, "failed to create temp file %d!=%d (%s)");
if (!f) return t_status;
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");
mark(0x11);
printf("debug file ungetbuf=%d\n", f->ungetc_buf);
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");
mark(0x22);
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'");
mark(0x33);
TEST(i, ftell(f), 1, "%d != %d");
TEST(i, fgetc(f), 'h', "'%c' != '%c'");
printf("%s finished\n", __FILE__);
fclose(f);
return t_status;
}