diff options
| -rw-r--r-- | ChangeLog | 3 | ||||
| -rw-r--r-- | libio/fmemopen.c | 16 | ||||
| -rw-r--r-- | stdio-common/tst-fmemopen2.c | 67 |
3 files changed, 84 insertions, 2 deletions
@@ -1,5 +1,8 @@ 2005-01-05 Ulrich Drepper <drepper@redhat.com> + * libio/fmemopen.c (fmemopen_seek): SEEK_END should count from + maximum used address, not maximum buffer position. + * libio/iofopncook.c (_IO_cookie_seekoff): Define. Mark offset as invalid to disable optimizations in fileops which won't work here. (_IO_cookie_jumps): Use it. diff --git a/libio/fmemopen.c b/libio/fmemopen.c index 265b848ebe..51e849e846 100644 --- a/libio/fmemopen.c +++ b/libio/fmemopen.c @@ -164,7 +164,7 @@ fmemopen_seek (void *cookie, _IO_off64_t *p, int w) break; case SEEK_END: - np = c->size - *p; + np = c->maxpos - *p; break; default: @@ -201,6 +201,13 @@ fmemopen (void *buf, size_t len, const char *mode) cookie_io_functions_t iof; fmemopen_cookie_t *c; + if (len == 0) + { + einval: + __set_errno (EINVAL); + return NULL; + } + c = (fmemopen_cookie_t *) malloc (sizeof (fmemopen_cookie_t)); if (c == NULL) return NULL; @@ -218,7 +225,12 @@ fmemopen (void *buf, size_t len, const char *mode) c->buffer[0] = '\0'; } else - c->buffer = buf; + { + if ((uintptr_t) len > -(uintptr_t) buf) + goto einval; + + c->buffer = buf; + } c->size = len; diff --git a/stdio-common/tst-fmemopen2.c b/stdio-common/tst-fmemopen2.c new file mode 100644 index 0000000000..6a0ee836a2 --- /dev/null +++ b/stdio-common/tst-fmemopen2.c @@ -0,0 +1,67 @@ +#include <assert.h> +#include <stdio.h> +#include <sys/types.h> + + +static int +do_test (void) +{ + int result = 0; + char buf[100]; + FILE *fp = fmemopen (buf, sizeof (buf), "w"); + if (fp == NULL) + { + puts ("fmemopen failed"); + return 0; + } + static const char str[] = "hello world"; +#define nstr (sizeof (str) - 1) + fputs (str, fp); + off_t o = ftello (fp); + if (o != nstr) + { + printf ("first ftello returned %ld, expected %zu\n", o, nstr); + result = 1; + } + rewind (fp); + o = ftello (fp); + if (o != 0) + { + printf ("second ftello returned %ld, expected %zu\n", o, 0); + result = 1; + } + if (fseeko (fp, 0, SEEK_END) != 0) + { + puts ("fseeko failed"); + return 1; + } + o = ftello (fp); + if (o != nstr) + { + printf ("third ftello returned %ld, expected %zu\n", o, nstr); + result = 1; + } + rewind (fp); + static const char str2[] = "just hello"; +#define nstr2 (sizeof (str2) - 1) + assert (nstr2 < nstr); + fputs (str2, fp); + o = ftello (fp); + if (o != nstr2) + { + printf ("fourth ftello returned %ld, expected %zu\n", o, nstr2); + result = 1; + } + fclose (fp); + static const char str3[] = "just hellod"; + if (strcmp (buf, str3) != 0) + { + printf ("final string is \"%s\", expected \"%s\"\n", + buf, str3); + result = 1; + } + return result; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |