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//
// Copyright 2020 Serge Martin
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#ifndef U_PRINTF_H
#define U_PRINTF_H
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include "simple_mtx.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct u_printf_info {
unsigned num_args;
unsigned *arg_sizes;
unsigned string_size;
char *strings;
} u_printf_info;
struct blob;
struct blob_reader;
void u_printf_serialize_info(struct blob *blob,
const u_printf_info *info,
unsigned printf_info_count);
u_printf_info *u_printf_deserialize_info(void *mem_ctx,
struct blob_reader *blob,
unsigned *printf_info_count);
uint32_t u_printf_hash(const u_printf_info *info);
void u_printf_singleton_init_or_ref(void);
void u_printf_singleton_decref(void);
void u_printf_singleton_add(const u_printf_info *info, unsigned count);
void u_printf_singleton_add_serialized(const void *data, size_t data_size);
const u_printf_info *u_printf_singleton_search(uint32_t hash);
struct u_printf_ctx {
simple_mtx_t lock;
void *bo;
uint32_t *map;
};
const char *util_printf_prev_tok(const char *str);
/* find next valid printf specifier in a C string wrapper */
size_t util_printf_next_spec_pos(const char *str, size_t pos);
/* Return the length of the string that would be generated by a printf-style
* format and argument list, not including the \0 byte.
* The untouched_args parameter is left untouched so it can be re-used by the
* caller in a vsnprintf() call or similar.
*/
size_t u_printf_length(const char *fmt, va_list untouched_args);
void u_printf(FILE *out, const char *buffer, size_t buffer_size,
const u_printf_info*, unsigned info_size);
void u_printf_ptr(FILE *out, const char *buffer, size_t buffer_size,
const u_printf_info **info, unsigned info_size);
static inline void
u_printf_init(struct u_printf_ctx *ctx, void *bo, uint32_t *map)
{
ctx->bo = bo;
ctx->map = map;
simple_mtx_init(&ctx->lock, mtx_plain);
/* Initialize the buffer head to point to just after the size + abort word */
map[0] = 8;
/* Initially there is no abort */
map[1] = 0;
}
static inline void
u_printf_destroy(struct u_printf_ctx *ctx)
{
simple_mtx_destroy(&ctx->lock);
}
static inline void
u_printf_with_ctx(FILE *out, struct u_printf_ctx *ctx)
{
/* If the printf buffer is empty, early-exit without taking the lock. The
* speeds up the happy path and makes this function reasonable to call even
* in release builds.
*/
if (ctx->map[0] == 8)
return;
simple_mtx_lock(&ctx->lock);
u_printf(out, (char *)(ctx->map + 2), ctx->map[0] - 8, NULL, 0);
/* Reset */
ctx->map[0] = 8;
simple_mtx_unlock(&ctx->lock);
}
/*
* Flush the printf buffer and return whether there was an abort. This is
* intended to be called periodically to handle aborts in a timely manner.
*/
static inline bool
u_printf_check_abort(FILE *out, struct u_printf_ctx *ctx)
{
u_printf_with_ctx(out, ctx);
/* Check the aborted flag */
return (ctx->map[1] != 0);
}
#ifdef __cplusplus
}
#endif
#endif
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