1 files changed, 174 insertions, 0 deletions
diff --git a/tools/libxutil/string_stream.c b/tools/libxutil/string_stream.c
new file mode 100644
index 0000000000..c3cf423d84
--- /dev/null
+++ b/tools/libxutil/string_stream.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2001, 2002 Hewlett-Packard Company.
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/** @file
+ * IOStream subtype for input and output to strings.
+ * Usable from user or kernel code (with __KERNEL__ defined).
+ */
+
+#include "sys_string.h"
+#include "string_stream.h"
+#include "allocate.h"
+
+static int string_print(IOStream *io, const char *msg, va_list args);
+static int string_getc(IOStream *io);
+static int string_error(IOStream *io);
+static int string_close(IOStream *io);
+static void string_free(IOStream *io);
+
+/** Methods for a string stream. */
+static IOMethods string_methods = {
+    //print: string_print,
+    //getc:  string_getc,
+    error: string_error,
+    close: string_close,
+    free:  string_free,
+};
+
+/** Get the string stream state.
+ *
+ * @param io string stream
+ * @return state
+ */
+static inline StringData *get_string_data(IOStream *io){
+    return (StringData*)io->data;
+}
+
+/** Read a character from a string stream.
+ *
+ * @param io string stream
+ * @return character read, IOSTREAM_EOF if no more input
+ */
+static int string_getc(IOStream *io){
+    StringData *data = get_string_data(io);
+    int c = IOSTREAM_EOF;
+    char *s = data->in;
+
+    if(s && s < data->end){
+        c = (unsigned)*s;
+        data->in = s+1;
+    }
+    return c;
+}
+
+/** Print to a string stream.
+ * Formats the data to an internal buffer and prints it.
+ * The formatted data must fit into the internal buffer.
+ *
+ * @param io string stream
+ * @param format print format
+ * @param args print arguments
+ * @return result of the print
+ */
+static int string_print(IOStream *io, const char *msg, va_list args){
+    StringData *data = get_string_data(io);
+    int k = data->end - data->out;
+    int n = vsnprintf(data->out, k, (char*)msg, args);
+    if(n < 0 || n > k ){
+        n = k;
+        IOStream_close(io);
+    } else {
+        data->out += n;
+    }
+    return n;
+}
+
+/** Test if a string stream has an error.
+ *
+ * @param io string stream
+ * @return 0 if ok, error code otherwise
+ */
+static int string_error(IOStream *io){
+    StringData *data = get_string_data(io);
+    return data->out == NULL;
+}
+
+/** Close a string stream.
+ *
+ * @param io string stream
+ * @return 0
+ */
+static int string_close(IOStream *io){
+    StringData *data = get_string_data(io);
+    data->in = NULL;
+    data->out = NULL;
+    return 0;
+}
+
+/** Free a string stream.
+ * The stream must have been allocated, not statically created.
+ * The stream state is freed, but the underlying string is not.
+ *
+ * @param io string stream
+ */
+static void string_free(IOStream *io){
+    StringData *data = get_string_data(io);
+    zero(data, sizeof(*data));
+    deallocate(data);
+}
+
+/** Get the methods to use for a string stream.
+ *
+ * @return methods
+ */
+IOMethods *string_stream_get_methods(void){
+    return &string_methods;
+}
+
+/** Initialise a string stream, usually from static data.
+ *
+ * @param io address of IOStream to fill in
+ * @param data address of StringData to fill in
+ * @param s string to use
+ * @param n length of the string
+ */
+void string_stream_init(IOStream *io, StringData *data, char *s, int n){
+    if(data && io){
+        zero(data, sizeof(*data));
+        data->string = (char*)s;
+        data->in = data->string;
+        data->out = data->string;
+        data->size = n;
+        data->end = data->string + n;
+        zero(io, sizeof(*io));
+        io->methods = &string_methods;
+        io->data = data;
+    }
+}
+
+/** Allocate and initialise a string stream.
+ *
+ * @param s string to use
+ * @param n length of the string
+ * @return new stream (free using IOStream_free)
+ */
+IOStream *string_stream_new(char *s, int n){
+    int ok = 0;
+    StringData *data = ALLOCATE(StringData);
+    IOStream *io = ALLOCATE(IOStream);
+    if(data && io){
+        ok = 1;
+        string_stream_init(io, data, s, n);
+    }
+    if(!ok){
+        deallocate(data);
+        deallocate(io);
+        io = NULL;
+    }
+    return io;
+}