Add Rich Felker's getsubopt, smaller then the glibc copied one

2 files changed, 39 insertions, 0 deletions

diff --git a/libc/unistd/Makefile.in b/libc/unistd/Makefile.in
index 4a0bb0734..5bd612465 100644
--- a/libc/unistd/Makefile.in
+++ b/libc/unistd/Makefile.in
@@ -24,6 +24,12 @@ else
 CSRC := $(filter-out getopt.c,$(CSRC))
 endif
 
+ifeq ($(UCLIBC_HAS_GNU_GETSUBOPT),y)
+CSRC := $(filter-out getsubopt-susv3.c,$(CSRC))
+else
+CSRC := $(filter-out getsubopt.c,$(CSRC))
+endif
+
 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 CSRC := $(filter-out sleep.c,$(CSRC))
 endif
diff --git a/libc/unistd/getsubopt-susv3.c b/libc/unistd/getsubopt-susv3.c
new file mode 100644
index 000000000..464223c42
--- /dev/null
+++ b/libc/unistd/getsubopt-susv3.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2006 Rich Felker <dalias@aerifal.cx>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+libc_hidden_proto(strchr)
+libc_hidden_proto(strlen)
+libc_hidden_proto(strncmp)
+
+int getsubopt(char **opt, char *const *keys, char **val)
+{
+	char *s = *opt;
+	int i;
+
+	*val = NULL;
+	*opt = strchr(s, ',');
+	if (*opt) *(*opt)++ = 0;
+	else *opt = s + strlen(s);
+
+	for (i=0; keys[i]; i++) {
+		size_t l = strlen(keys[i]);
+		if (strncmp(keys[i], s, l)) continue;
+		if (s[l] == '=')
+			*val = s + l;
+		else if (s[l]) continue;
+		return i;
+	}
+	return -1;
+}