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| author | Ulrich Drepper <drepper@redhat.com> | 2005-09-27 00:00:42 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2005-09-27 00:00:42 +0000 |
| commit | b5d839c996d7236ed5788296b4d723e67ec4fdb8 (patch) | |
| tree | a5220f793e6180e189b99ab8c59401ab01a26f71 /libio/iofgets.c | |
| parent | 9a5933834ba8f1289024c1ab13e1cd711b5ec3af (diff) | |
| download | glibc-b5d839c996d7236ed5788296b4d723e67ec4fdb8.tar.gz glibc-b5d839c996d7236ed5788296b4d723e67ec4fdb8.tar.xz glibc-b5d839c996d7236ed5788296b4d723e67ec4fdb8.zip | |
[BZ #713]
2005-09-26 Ulrich Drepper <drepper@redhat.com> [BZ #713] * libio/iofgets.c: Treat N==1 correctly. * libio/iofgets_u.c: Likewise. * libio/iofgetws.c: Likewise. * libio/iofgetws_u.c: Likewise. * stdio-common/Makefile (tests): Add tst-fgets. * stdio-common/tst-fgets.c: New file.
Diffstat (limited to 'libio/iofgets.c')
| -rw-r--r-- | libio/iofgets.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libio/iofgets.c b/libio/iofgets.c index 879cc975a3..601b1746a1 100644 --- a/libio/iofgets.c +++ b/libio/iofgets.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003 +/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -41,6 +41,14 @@ _IO_fgets (buf, n, fp) CHECK_FILE (fp, NULL); if (n <= 0) return NULL; + if (__builtin_expect (n == 1, 0)) + { + /* Another irregular case: since we have to store a NUL byte and + there is only room for exactly one byte, we don't have to + read anything. */ + buf[0] = '\0'; + return buf; + } _IO_acquire_lock (fp); /* This is very tricky since a file descriptor may be in the non-blocking mode. The error flag doesn't mean much in this |