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-rw-r--r--libc/string/generic/strtok_r.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/libc/string/generic/strtok_r.c b/libc/string/generic/strtok_r.c
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+++ b/libc/string/generic/strtok_r.c
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+/* Reentrant string tokenizer. Generic version.
+ Copyright (C) 1991,1996-1999,2001,2004 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#define _GNU_SOURCE
+#include <string.h>
+
+#undef strtok_r
+#undef __strtok_r
+
+/* Parse S into tokens separated by characters in DELIM.
+ If S is NULL, the saved pointer in SAVE_PTR is used as
+ the next starting point. For example:
+ char s[] = "-abc-=-def";
+ char *sp;
+ x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
+ x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
+ x = strtok_r(NULL, "=", &sp); // x = NULL
+ // s = "abc\0-def\0"
+*/
+char *
+__strtok_r (s, delim, save_ptr)
+ char *s;
+ const char *delim;
+ char **save_ptr;
+{
+ char *token;
+
+ if (s == NULL)
+ s = *save_ptr;
+
+ /* Scan leading delimiters. */
+ s += strspn (s, delim);
+ if (*s == '\0')
+ {
+ *save_ptr = s;
+ return NULL;
+ }
+
+ /* Find the end of the token. */
+ token = s;
+ s = strpbrk (token, delim);
+ if (s == NULL)
+ /* This token finishes the string. */
+ *save_ptr = rawmemchr (token, '\0');
+ else
+ {
+ /* Terminate the token and make *SAVE_PTR point past it. */
+ *s = '\0';
+ *save_ptr = s + 1;
+ }
+ return token;
+}
+weak_alias (__strtok_r, strtok_r)