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authorRoland McGrath <roland@gnu.org>1996-03-14 11:20:23 +0000
committerRoland McGrath <roland@gnu.org>1996-03-14 11:20:23 +0000
commit8d71c7b0e4f76dce251a121e07dff8212bed73f8 (patch)
treea90fd3140fbd2922cb6006150f8a89f4be0c888d /string
parent52e9a9d1187e1a2a7357f3a0f353058e14667d62 (diff)
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Thu Mar 14 06:01:07 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>
* string/strnlen.c: New file. * string/Makefile (routines): Add strnlen. * string/string.h [__USE_GNU] (strnlen): Declare new function. [__OPTIMIZE__]: Define extern inline implementation of it.
Diffstat (limited to 'string')
-rw-r--r--string/Makefile5
-rw-r--r--string/string.h17
-rw-r--r--string/strnlen.c30
3 files changed, 50 insertions, 2 deletions
diff --git a/string/Makefile b/string/Makefile
index 1fa63c24d2..5901c36594 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+# Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
@@ -24,7 +24,8 @@ subdir := string
headers := string.h strings.h memory.h endian.h bytesex.h
routines := strcat strchr strcmp strcoll strcpy strcspn strdup \
- strerror _strerror strlen strncat strncmp strncpy \
+ strerror _strerror strlen strnlen \
+ strncat strncmp strncpy \
strrchr strpbrk strsignal strspn strstr strtok \
strxfrm memchr memcmp memmove memset \
bcopy bzero ffs stpcpy stpncpy \
diff --git a/string/string.h b/string/string.h
index 95dcba0041..49b29fd168 100644
--- a/string/string.h
+++ b/string/string.h
@@ -127,9 +127,26 @@ extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
__const __ptr_t __needle, size_t __needlelen));
#endif
+
/* Return the length of S. */
extern size_t strlen __P ((__const char *__s));
+#ifdef __USE_GNU
+/* Find the length of STRING, but scan at most MAXLEN characters.
+ If no '\0' terminator is found in that many characters, return MAXLEN. */
+extern size_t strnlen __P ((__const char *__string, size_t __maxlen));
+
+#ifdef __OPTIMIZE__
+extern __inline size_t
+strnlen (__const char *__string, size_t __maxlen)
+{
+ __const char *__end = memchr (__string, '\0', __maxlen);
+ return __end ? __end - __string : __maxlen;
+}
+#endif
+#endif
+
+
/* Return a string describing the meaning of the `errno' code in ERRNUM. */
extern char *strerror __P ((int __errnum));
#ifdef __USE_REENTRANT
diff --git a/string/strnlen.c b/string/strnlen.c
new file mode 100644
index 0000000000..eb01a63692
--- /dev/null
+++ b/string/strnlen.c
@@ -0,0 +1,30 @@
+/* Find the length of STRING, but scan at most MAXLEN characters.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <string.h>
+
+/* Find the length of STRING, but scan at most MAXLEN characters.
+ If no '\0' terminator is found in that many characters, return MAXLEN. */
+
+size_t
+strnlen (const char *string, size_t maxlen)
+{
+ const char *end = memchr (string, '\0', maxlen);
+ return end ? end - string : maxlen;
+}