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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009-2012 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*/
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "upb/upb.h"
// Like vasprintf (which allocates a string large enough for the result), but
// uses *buf (which can be NULL) as a starting point and reallocates it only if
// the new value will not fit. "size" is updated to reflect the allocated size
// of the buffer. Starts writing at the given offset into the string; bytes
// preceding this offset are unaffected. Returns the new length of the string,
// or -1 on memory allocation failure.
static int upb_vrprintf(char **buf, size_t *size, size_t ofs,
const char *fmt, va_list args) {
// Try once without reallocating. We have to va_copy because we might have
// to call vsnprintf again.
uint32_t len = *size - ofs;
va_list args_copy;
va_copy(args_copy, args);
uint32_t true_len = vsnprintf(*buf + ofs, len, fmt, args_copy);
va_end(args_copy);
// Resize to be the correct size.
if (true_len >= len) {
// Need to print again, because some characters were truncated. vsnprintf
// will not write the entire string unless you give it space to store the
// NULL terminator also.
*size = (ofs + true_len + 1);
char *newbuf = realloc(*buf, *size);
if (!newbuf) return -1;
vsnprintf(newbuf + ofs, true_len + 1, fmt, args);
*buf = newbuf;
}
return true_len;
}
void upb_status_init(upb_status *status) {
status->buf = NULL;
status->bufsize = 0;
upb_status_clear(status);
}
void upb_status_uninit(upb_status *status) {
free(status->buf);
}
bool upb_ok(const upb_status *status) { return !status->error; }
bool upb_eof(const upb_status *status) { return status->eof_; }
void upb_status_seterrf(upb_status *status, const char *msg, ...) {
if (!status) return;
status->error = true;
status->space = NULL;
va_list args;
va_start(args, msg);
upb_vrprintf(&status->buf, &status->bufsize, 0, msg, args);
va_end(args);
status->str = status->buf;
}
void upb_status_seterrliteral(upb_status *status, const char *msg) {
if (!status) return;
status->error = true;
status->str = msg;
status->space = NULL;
}
void upb_status_copy(upb_status *to, const upb_status *from) {
if (!to) return;
to->error = from->error;
to->eof_ = from->eof_;
to->code = from->code;
to->space = from->space;
if (from->str == from->buf) {
if (to->bufsize < from->bufsize) {
to->bufsize = from->bufsize;
to->buf = realloc(to->buf, to->bufsize);
}
memcpy(to->buf, from->buf, from->bufsize);
to->str = to->buf;
} else {
to->str = from->str;
}
}
const char *upb_status_getstr(const upb_status *_status) {
// Function is logically const but can modify internal state to materialize
// the string.
upb_status *status = (upb_status*)_status;
if (status->str == NULL && status->space) {
if (status->space->code_to_string) {
status->space->code_to_string(status->code, status->buf, status->bufsize);
status->str = status->buf;
} else {
upb_status_seterrf(status, "No message, error space=%s, code=%d\n",
status->space->name, status->code);
}
}
return status->str;
}
void upb_status_clear(upb_status *status) {
if (!status) return;
status->error = false;
status->eof_ = false;
status->code = 0;
status->space = NULL;
status->str = NULL;
}
void upb_status_setcode(upb_status *status, upb_errorspace *space, int code) {
if (!status) return;
status->code = code;
status->space = space;
status->str = NULL;
}
void upb_status_seteof(upb_status *status) {
if (!status) return;
status->eof_ = true;
}
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