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-rw-r--r--libc/string/strsep.c81
1 files changed, 56 insertions, 25 deletions
diff --git a/libc/string/strsep.c b/libc/string/strsep.c
index 797807a91..797b74400 100644
--- a/libc/string/strsep.c
+++ b/libc/string/strsep.c
@@ -1,34 +1,65 @@
-/* Copyright (C) 1992, 1993 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1992, 93, 96, 97, 98, 99 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 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.
+ 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. */
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include <string.h>
-char *strsep( char **pp, const char *delim)
+char * strsep( char **stringp, const char *delim)
{
- char *p, *q;
-
- if (!(p = *pp))
- return 0;
- if ((q = strpbrk(p, delim))) {
- *pp = q + 1;
- *q = '\0';
- } else
- *pp = 0;
- return p;
+ char *begin, *end;
+
+ begin = *stringp;
+ if (begin == NULL)
+ return NULL;
+
+ /* A frequent case is when the delimiter string contains only one
+ character. Here we don't need to call the expensive `strpbrk'
+ function and instead work using `strchr'. */
+ if (delim[0] == '\0' || delim[1] == '\0')
+ {
+ char ch = delim[0];
+
+ if (ch == '\0')
+ end = NULL;
+ else
+ {
+ if (*begin == ch)
+ end = begin;
+ else if (*begin == '\0')
+ end = NULL;
+ else
+ end = strchr (begin + 1, ch);
+ }
+ }
+ else
+ /* Find the end of the token. */
+ end = strpbrk (begin, delim);
+
+ if (end)
+ {
+ /* Terminate the token and set *STRINGP past NUL character. */
+ *end++ = '\0';
+ *stringp = end;
+ }
+ else
+ /* No more delimiters; this is the last token. */
+ *stringp = NULL;
+
+ return begin;
}
+