diff options
Diffstat (limited to 'stdio-common/tst-ungetc.c')
-rw-r--r-- | stdio-common/tst-ungetc.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/stdio-common/tst-ungetc.c b/stdio-common/tst-ungetc.c new file mode 100644 index 0000000..67c45d4 --- /dev/null +++ b/stdio-common/tst-ungetc.c @@ -0,0 +1,42 @@ +/* Test for ungetc bugs. */ + +#include <stdio.h> + +#define assert(x) \ + if (!(x)) \ + { \ + fputs ("test failed: " #x "\n", stderr); \ + retval = 1; \ + goto the_end; \ + } + +int +main (int argc, char *argv[]) +{ + char *name; + FILE *fp = NULL; + int retval = 0; + int c; + + name = tmpnam (NULL); + fp = fopen (name, "w"); + assert (fp != NULL) + fputs ("bl", fp); + fclose (fp); + fp = NULL; + + fp = fopen (name, "r"); + assert (fp != NULL) + assert (getc (fp) != EOF); + assert ((c = getc (fp)) != EOF); + assert (getc (fp) == EOF); + assert (ungetc (c, fp) == c); + assert (feof (fp) == 0); + +the_end: + if (fp != NULL) + fclose (fp); + unlink (name); + + return retval; +} |