src/cx/printf.h

/*
 * 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
 * \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


/**
 * The maximum string length that fits into stack memory.
 */
extern unsigned const cx_printf_sbo_size;

/**
 * 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__)


/**
 * An \c sprintf like function which reallocates the string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param str a pointer to the string buffer
 * @param len a pointer to the length of the buffer
 * @param fmt the format string
 * @param ... additional arguments
 * @return the length of produced string
 */
#define cx_sprintf(str, len, fmt, ...) cx_sprintf_a(cxDefaultAllocator, str, len, fmt, __VA_ARGS__)

/**
 * An \c sprintf like function which reallocates the string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * \attention The original buffer MUST have been allocated with the same allocator!
 *
 * @param alloc the allocator to use
 * @param str a pointer to the string buffer
 * @param len a pointer to the length of the buffer
 * @param fmt the format string
 * @param ... additional arguments
 * @return the length of produced string
 */
__attribute__((__nonnull__(1, 2, 3, 4), __format__(printf, 4, 5)))
int cx_sprintf_a(CxAllocator *alloc, char **str, size_t *len, const char *fmt, ... );


/**
 * An \c sprintf like function which reallocates the string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * @param str a pointer to the string buffer
 * @param len a pointer to the length of the buffer
 * @param fmt the format string
 * @param ap argument list
 * @return the length of produced string
 */
#define cx_vsprintf(str, len, fmt, ap) cx_vsprintf_a(cxDefaultAllocator, str, len, fmt, ap)

/**
 * An \c sprintf like function which reallocates the string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * \attention The original buffer MUST have been allocated with the same allocator!
 *
 * @param alloc the allocator to use
 * @param str a pointer to the string buffer
 * @param len a pointer to the length of the buffer
 * @param fmt the format string
 * @param ap argument list
 * @return the length of produced string
 */
__attribute__((__nonnull__))
int cx_vsprintf_a(CxAllocator *alloc, char **str, size_t *len, const char *fmt, va_list ap);


/**
 * An \c sprintf like function which allocates a new string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * The location of the resulting string will \em always be stored to \p str. When the buffer
 * was sufficiently large, \p buf itself will be stored to the location of \p str.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 * 
 * \remark When a new string needed to be allocated, the contents of \p buf will be
 * poisoned after the call, because this function tries to produce the string in \p buf, first.
 *
 * @param buf a pointer to the buffer
 * @param len a pointer to the length of the buffer
 * @param str a pointer to the location
 * @param fmt the format string
 * @param ... additional arguments
 * @return the length of produced string
 */
#define cx_sprintf_s(buf, len, str, fmt, ...) cx_sprintf_sa(cxDefaultAllocator, buf, len, str, fmt, __VA_ARGS__)

/**
 * An \c sprintf like function which allocates a new string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * The location of the resulting string will \em always be stored to \p str. When the buffer
 * was sufficiently large, \p buf itself will be stored to the location of \p str.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * \remark When a new string needed to be allocated, the contents of \p buf will be
 * poisoned after the call, because this function tries to produce the string in \p buf, first.
 *
 * @param alloc the allocator to use
 * @param buf a pointer to the buffer
 * @param len a pointer to the length of the buffer
 * @param str a pointer to the location
 * @param fmt the format string
 * @param ... additional arguments
 * @return the length of produced string
 */
__attribute__((__nonnull__(1, 2, 4, 5), __format__(printf, 5, 6)))
int cx_sprintf_sa(CxAllocator *alloc, char *buf, size_t *len, char **str, const char *fmt, ... );

/**
 * An \c sprintf like function which allocates a new string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * The location of the resulting string will \em always be stored to \p str. When the buffer
 * was sufficiently large, \p buf itself will be stored to the location of \p str.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * \remark When a new string needed to be allocated, the contents of \p buf will be
 * poisoned after the call, because this function tries to produce the string in \p buf, first.
 *
 * @param buf a pointer to the buffer
 * @param len a pointer to the length of the buffer
 * @param str a pointer to the location
 * @param fmt the format string
 * @param ap argument list
 * @return the length of produced string
 */
#define cx_vsprintf_s(buf, len, str, fmt, ap) cx_vsprintf_sa(cxDefaultAllocator, buf, len, str, fmt, ap)

/**
 * An \c sprintf like function which allocates a new string when the buffer is not large enough.
 *
 * The size of the buffer will be updated in \p len when necessary.
 *
 * The location of the resulting string will \em always be stored to \p str. When the buffer
 * was sufficiently large, \p buf itself will be stored to the location of \p str.
 *
 * \note The resulting string is guaranteed to be zero-terminated.
 *
 * \remark When a new string needed to be allocated, the contents of \p buf will be
 * poisoned after the call, because this function tries to produce the string in \p buf, first.
 *
 * @param alloc the allocator to use
 * @param buf a pointer to the buffer
 * @param len a pointer to the length of the buffer
 * @param str a pointer to the location
 * @param fmt the format string
 * @param ap argument list
 * @return the length of produced string
 */
__attribute__((__nonnull__))
int cx_vsprintf_sa(CxAllocator *alloc, char *buf, size_t *len, char **str, const char *fmt, va_list ap);


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

#endif //UCX_PRINTF_H