diff options
Diffstat (limited to 'misc/error.c')
| -rw-r--r-- | misc/error.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/misc/error.c b/misc/error.c index 2501583366..b608913fae 100644 --- a/misc/error.c +++ b/misc/error.c @@ -74,6 +74,7 @@ unsigned int error_message_count; # define program_name program_invocation_name # include <errno.h> +# include <limits.h> # include <libio/libioP.h> /* In GNU libc we want do not want to use the common name `error' directly. @@ -182,14 +183,15 @@ error_tail (int status, int errnum, const char *message, va_list args) mbstate_t st; size_t res; const char *tmp; + bool use_malloc = false; - do + while (1) { - if (len < ALLOCA_LIMIT) + if (__libc_use_alloca (len * sizeof (wchar_t))) wmessage = (wchar_t *) alloca (len * sizeof (wchar_t)); else { - if (wmessage != NULL && len / 2 < ALLOCA_LIMIT) + if (!use_malloc) wmessage = NULL; wchar_t *p = (wchar_t *) realloc (wmessage, @@ -201,18 +203,38 @@ error_tail (int status, int errnum, const char *message, va_list args) return; } wmessage = p; + use_malloc = true; } memset (&st, '\0', sizeof (st)); tmp = message; + + res = mbsrtowcs (wmessage, &tmp, len, &st); + if (res != len) + break; + + if (__builtin_expect (len >= SIZE_MAX / 2, 0)) + { + /* This really should not happen if everything is fine. */ + res = (size_t) -1; + break; + } + + len *= 2; } - while ((res = mbsrtowcs (wmessage, &tmp, len, &st)) == len); if (res == (size_t) -1) - /* The string cannot be converted. */ - wmessage = (wchar_t *) L"???"; + { + /* The string cannot be converted. */ + if (use_malloc) + free (wmessage); + wmessage = (wchar_t *) L"???"; + } __vfwprintf (stderr, wmessage, args); + + if (use_malloc) + free (wmessage); } else # endif |