diff options
Diffstat (limited to 'libio/bug-ungetc3.c')
-rw-r--r-- | libio/bug-ungetc3.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/libio/bug-ungetc3.c b/libio/bug-ungetc3.c new file mode 100644 index 0000000..0c83c11 --- /dev/null +++ b/libio/bug-ungetc3.c @@ -0,0 +1,94 @@ +/* Test program for ungetc/ftell interaction bug. */ + +#include <stdio.h> + +static void do_prepare (void); +#define PREPARE(argc, argv) do_prepare () +static int do_test (void); +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" + +static const char pattern[] = "12345"; +static char *temp_file; + +static void +do_prepare (void) +{ + int fd = create_temp_file ("bug-ungetc.", &temp_file); + if (fd == -1) + { + printf ("cannot create temporary file: %m\n"); + exit (1); + } + write (fd, pattern, sizeof (pattern)); + close (fd); +} + +static int +do_one_test (int mode) +{ + FILE *f; + + f = fopen (temp_file, "r"); + if (f == NULL) + { + printf ("could not open temporary file: %m\n"); + return 1; + } + + if (mode == 1 && ftell (f) != 0) + { + printf ("first ftell returned wrong position %ld\n", ftell (f)); + return 1; + } + + if (fgetc (f) != '1' || fgetc (f) != '2') + { + puts ("fgetc failed"); + return 1; + } + + if (mode == 2 && ftell (f) != 2) + { + printf ("second ftell returned wrong position %ld\n", ftell (f)); + return 1; + } + + if (ungetc ('6', f) != '6') + { + puts ("ungetc failed"); + return 1; + } + + if (ftell (f) != 1) + { + printf ("third ftell returned wrong position %ld\n", ftell (f)); + return 1; + } + + if (fgetc (f) != '6') + { + puts ("fgetc failed"); + return 1; + } + + if (ftell (f) != 2) + { + printf ("fourth ftell returned wrong position %ld\n", ftell (f)); + return 1; + } + + fclose (f); + + return 0; +} + +static int +do_test (void) +{ + int mode; + for (mode = 0; mode <= 2; mode++) + if (do_one_test (mode)) + return 1; + return 0; +} |