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authorManuel Novoa III <mjn3@codepoet.org>2002-09-19 17:31:15 +0000
committerManuel Novoa III <mjn3@codepoet.org>2002-09-19 17:31:15 +0000
commitc547e924ad577625dc6c14f3b7fea965b5d74be0 (patch)
tree504ef52db6861c81c6041fa330a8f5153bbea0ff /libc/unistd/getsubopt.c
parent309ce1f19f774f592d790e89de900dd81300c90b (diff)
Add SUSv3 function getsubopt.
Diffstat (limited to 'libc/unistd/getsubopt.c')
-rw-r--r--libc/unistd/getsubopt.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/libc/unistd/getsubopt.c b/libc/unistd/getsubopt.c
new file mode 100644
index 000000000..682eb4bc4
--- /dev/null
+++ b/libc/unistd/getsubopt.c
@@ -0,0 +1,72 @@
+/* Parse comma separate list into words.
+ Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+ 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. */
+
+#include <stdlib.h>
+#include <string.h>
+
+extern char *__strchrnul(const char *s, int c);
+
+/* Parse comma separated suboption from *OPTIONP and match against
+ strings in TOKENS. If found return index and set *VALUEP to
+ optional value introduced by an equal sign. If the suboption is
+ not part of TOKENS return in *VALUEP beginning of unknown
+ suboption. On exit *OPTIONP is set to the beginning of the next
+ token or at the terminating NUL character. */
+int getsubopt(char **optionp, char *const *tokens, char **valuep)
+{
+ char *endp, *vstart;
+ int cnt;
+
+ if (**optionp == '\0')
+ return -1;
+
+ /* Find end of next token. */
+ endp = __strchrnul (*optionp, ',');
+
+ /* Find start of value. */
+ vstart = memchr (*optionp, '=', endp - *optionp);
+ if (vstart == NULL)
+ vstart = endp;
+
+ /* Try to match the characters between *OPTIONP and VSTART against
+ one of the TOKENS. */
+ for (cnt = 0; tokens[cnt] != NULL; ++cnt)
+ if (memcmp (*optionp, tokens[cnt], vstart - *optionp) == 0
+ && tokens[cnt][vstart - *optionp] == '\0')
+ {
+ /* We found the current option in TOKENS. */
+ *valuep = vstart != endp ? vstart + 1 : NULL;
+
+ if (*endp != '\0')
+ *endp++ = '\0';
+ *optionp = endp;
+
+ return cnt;
+ }
+
+ /* The current suboption does not match any option. */
+ *valuep = *optionp;
+
+ if (*endp != '\0')
+ *endp++ = '\0';
+ *optionp = endp;
+
+ return -1;
+}