Add libString.

1 files changed, 40 insertions, 0 deletions

diff --git a/src/libString/s_parse.c b/src/libString/s_parse.c
new file mode 100644
index 00000000..376a41e2
--- /dev/null
+++ b/src/libString/s_parse.c
@@ -0,0 +1,40 @@
+#include <u.h>
+#include <libc.h>
+#include "libString.h"
+
+#define isspace(c) ((c)==' ' || (c)=='\t' || (c)=='\n')
+
+/* Get the next field from a String.  The field is delimited by white space,
+ * single or double quotes.
+ */
+String *
+s_parse(String *from, String *to)
+{
+	if (*from->ptr == '\0')
+		return 0;
+	if (to == 0)
+		to = s_new();
+	if (*from->ptr == '\'') {
+		from->ptr++;
+		for (;*from->ptr != '\'' && *from->ptr != '\0'; from->ptr++)
+			s_putc(to, *from->ptr);
+		if (*from->ptr == '\'')	
+			from->ptr++;
+	} else if (*from->ptr == '"') {
+		from->ptr++;
+		for (;*from->ptr != '"' && *from->ptr != '\0'; from->ptr++)
+			s_putc(to, *from->ptr);
+		if (*from->ptr == '"')	
+			from->ptr++;
+	} else {
+		for (;!isspace(*from->ptr) && *from->ptr != '\0'; from->ptr++)
+			s_putc(to, *from->ptr);
+	}
+	s_terminate(to);
+
+	/* crunch trailing white */
+	while(isspace(*from->ptr))
+		from->ptr++;
+
+	return to;
+}