ucx/cx/printf.h

Sun, 17 Dec 2023 15:33:50 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 17 Dec 2023 15:33:50 +0100
changeset 800
30d484806c2b
parent 747
efbd59642577
child 816
839fefbdedc7
permissions
-rw-r--r--

fix faulty string to int conversion utilities

Probably it was expected that errno is set to EINVAL when illegal characters are encountered. But this is not standard and does not happen on every system, allowing illegal strings to be parsed as valid integers.

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * \file printf.h
 * \brief Wrapper for write functions with a printf-like interface.
 * \author Mike Becker
 * \author Olaf Wintermann
 * \version 3.0
 * \copyright 2-Clause BSD License
 */

#ifndef UCX_PRINTF_H
#define UCX_PRINTF_H

#include "common.h"
#include "string.h"
#include <stdarg.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * A \c fprintf like function which writes the output to a stream by
 * using a write_func.
 *
 * @param stream the stream the data is written to
 * @param wfc the write function
 * @param fmt format string
 * @param ... additional arguments
 * @return the total number of bytes written
 */
__attribute__((__nonnull__(1, 2, 3), __format__(printf, 3, 4)))
int cx_fprintf(
        void *stream,
        cx_write_func wfc,
        char const *fmt,
        ...
);

/**
 * A \c vfprintf like function which writes the output to a stream by
 * using a write_func.
 *
 * @param stream the stream the data is written to
 * @param wfc the write function
 * @param fmt format string
 * @param ap argument list
 * @return the total number of bytes written
 * @see cx_fprintf()
 */
__attribute__((__nonnull__))
int cx_vfprintf(
        void *stream,
        cx_write_func wfc,
        char const *fmt,
        va_list ap
);

/**
 * A \c asprintf like function which allocates space for a string
 * the result is written to.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param allocator the CxAllocator used for allocating the string
 * @param fmt format string
 * @param ... additional arguments
 * @return the formatted string
 * @see cx_strfree_a()
 */
__attribute__((__nonnull__(1, 2), __format__(printf, 2, 3)))
cxmutstr cx_asprintf_a(
        CxAllocator const *allocator,
        char const *fmt,
        ...
);

/**
 * A \c asprintf like function which allocates space for a string
 * the result is written to.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param fmt format string
 * @param ... additional arguments
 * @return the formatted string
 * @see cx_strfree()
 */
#define cx_asprintf(fmt, ...) \
    cx_asprintf_a(cxDefaultAllocator, fmt, __VA_ARGS__)

/**
* A \c vasprintf like function which allocates space for a string
 * the result is written to.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param allocator the CxAllocator used for allocating the string
 * @param fmt format string
 * @param ap argument list
 * @return the formatted string
 * @see cx_asprintf_a()
 */
__attribute__((__nonnull__))
cxmutstr cx_vasprintf_a(
        CxAllocator const *allocator,
        char const *fmt,
        va_list ap
);

/**
* A \c vasprintf like function which allocates space for a string
 * the result is written to.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param fmt format string
 * @param ap argument list
 * @return the formatted string
 * @see cx_asprintf()
 */
#define cx_vasprintf(fmt, ap) cx_vasprintf_a(cxDefaultAllocator, fmt, ap)

/**
 * A \c printf like function which writes the output to a CxBuffer.
 *
 * @param buffer a pointer to the buffer the data is written to
 * @param fmt the format string
 * @param ... additional arguments
 * @return the total number of bytes written
 * @see ucx_fprintf()
 */
#define cx_bprintf(buffer, fmt, ...) cx_fprintf((CxBuffer*)buffer, \
    (cx_write_func) cxBufferWrite, fmt, __VA_ARGS__)

#ifdef __cplusplus
} // extern "C"
#endif

#endif //UCX_PRINTF_H

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