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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_strstream.h"
#include <stdlib.h>
#include "upb_string.h"
/* upb_stringsrc **************************************************************/
static upb_strlen_t upb_stringsrc_read(upb_bytesrc *_src, void *buf,
upb_strlen_t count, upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(src->str)) {
status->code = UPB_EOF;
return -1;
} else {
upb_strlen_t to_read = UPB_MIN(count, upb_string_len(src->str) - src->offset);
memcpy(buf, upb_string_getrobuf(src->str) + src->offset, to_read);
src->offset += to_read;
return to_read;
}
}
static bool upb_stringsrc_getstr(upb_bytesrc *_src, upb_string *str,
upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(src->str)) {
status->code = UPB_EOF;
return false;
} else {
upb_strlen_t len = upb_string_len(src->str) - src->offset;
upb_string_substr(str, src->str, src->offset, len);
src->offset += len;
assert(src->offset == upb_string_len(src->str));
return true;
}
}
void upb_stringsrc_init(upb_stringsrc *s) {
static upb_bytesrc_vtbl vtbl = {
upb_stringsrc_read,
upb_stringsrc_getstr,
};
upb_bytesrc_init(&s->bytesrc, &vtbl);
s->str = NULL;
}
void upb_stringsrc_reset(upb_stringsrc *s, upb_string *str) {
if (str != s->str) {
upb_string_unref(s->str);
s->str = upb_string_getref(str);
}
s->offset = 0;
}
void upb_stringsrc_uninit(upb_stringsrc *s) {
upb_string_unref(s->str);
}
upb_bytesrc *upb_stringsrc_bytesrc(upb_stringsrc *s) {
return &s->bytesrc;
}
/* upb_stringsink *************************************************************/
void upb_stringsink_uninit(upb_stringsink *s) {
upb_string_unref(s->str);
}
// Resets the stringsink to a state where it will append to the given string.
// The string must be newly created or recycled. The stringsink will take a
// reference on the string, so the caller need not ensure that it outlives the
// stringsink. A stringsink can be reset multiple times.
void upb_stringsink_reset(upb_stringsink *s, upb_string *str) {
if (str != s->str) {
upb_string_unref(s->str);
s->str = upb_string_getref(str);
}
// Resize to 0.
upb_string_getrwbuf(s->str, 0);
}
upb_bytesink *upb_stringsink_bytesink(upb_stringsink *s) {
return &s->bytesink;
}
static upb_strlen_t upb_stringsink_vprintf(upb_bytesink *_sink, upb_status *s,
const char *fmt, va_list args) {
(void)s; // No errors can occur.
upb_stringsink *sink = (upb_stringsink*)_sink;
return upb_string_vprintf_at(sink->str, upb_string_len(sink->str), fmt, args);
}
static upb_strlen_t upb_stringsink_putstr(upb_bytesink *_sink, upb_string *str,
upb_status *s) {
(void)s; // No errors can occur.
upb_stringsink *sink = (upb_stringsink*)_sink;
upb_strcat(sink->str, str);
return upb_string_len(str);
}
void upb_stringsink_init(upb_stringsink *s) {
static upb_bytesink_vtbl vtbl = {
NULL,
upb_stringsink_putstr,
upb_stringsink_vprintf
};
upb_bytesink_init(&s->bytesink, &vtbl);
s->str = NULL;
}
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