webserver: comparison src/ucx/cx/printf.h

-:eb48f716b31c
+:e10457d74fe1
 * 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
+* @file printf.h
-* \brief Wrapper for write functions with a printf-like interface.
+* @brief Wrapper for write functions with a printf-like interface.
-* \author Mike Becker
+* @author Mike Becker
-* \author Olaf Wintermann
+* @author Olaf Wintermann
-* \version 3.0
+* @copyright 2-Clause BSD License
-* \copyright 2-Clause BSD License
 */
 #ifndef UCX_PRINTF_H
 #define UCX_PRINTF_H
 #include "common.h"
 #include "string.h"
 #include <stdarg.h>
+/**
+* Attribute for printf-like functions.
+* @param fmt_idx index of the format string parameter
+* @param arg_idx index of the first formatting argument
+*/
+#define cx_attr_printf(fmt_idx, arg_idx) \
+__attribute__((__format__(printf, fmt_idx, arg_idx)))
 #ifdef __cplusplus
 extern "C" {
 #endif
-/**
-* A \c fprintf like function which writes the output to a stream by
+/**
+* The maximum string length that fits into stack memory.
+*/
+cx_attr_export
+extern const unsigned 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
+* @return the total number of bytes written or an error code from stdlib printf implementation
 */
-__attribute__((__nonnull__(1, 2, 3), __format__(printf, 3, 4)))
+cx_attr_nonnull_arg(1, 2, 3)
+cx_attr_printf(3, 4)
+cx_attr_cstr_arg(3)
+cx_attr_export
 int cx_fprintf(
 void *stream,
 cx_write_func wfc,
-char const *fmt,
+const char *fmt,
 ...
 );
 /**
-* A \c vfprintf like function which writes the output to a stream by
+* 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
+* @return the total number of bytes written or an error code from stdlib printf implementation
 * @see cx_fprintf()
 */
-__attribute__((__nonnull__))
+cx_attr_nonnull
+cx_attr_cstr_arg(3)
+cx_attr_export
 int cx_vfprintf(
 void *stream,
 cx_write_func wfc,
-char const *fmt,
+const char *fmt,
 va_list ap
 );
 /**
-* A \c asprintf like function which allocates space for a string
+* 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.
+* @note The resulting string is guaranteed to be zero-terminated,
+* unless there was an error, in which case the string's pointer
+* will be @c NULL.
 *
 * @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)))
+cx_attr_nonnull_arg(1, 2)
+cx_attr_printf(2, 3)
+cx_attr_cstr_arg(2)
+cx_attr_export
 cxmutstr cx_asprintf_a(
-CxAllocator const *allocator,
+const CxAllocator *allocator,
-char const *fmt,
+const char *fmt,
 ...
 );
 /**
-* A \c asprintf like function which allocates space for a string
+* 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.
+* @note The resulting string is guaranteed to be zero-terminated,
-*
+* unless there was an error, in which case the string's pointer
-* @param fmt format string
+* will be @c NULL.
-* @param ... additional arguments
+*
-* @return the formatted string
+* @param fmt (@c char*) format string
+* @param ... additional arguments
+* @return (@c cxmutstr) 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
+* 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.
+* @note The resulting string is guaranteed to be zero-terminated,
+* unless there was an error, in which case the string's pointer
+* will be @c NULL.
 *
 * @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__))
+cx_attr_nonnull
+cx_attr_cstr_arg(2)
+cx_attr_export
 cxmutstr cx_vasprintf_a(
-CxAllocator const *allocator,
+const CxAllocator *allocator,
-char const *fmt,
+const char *fmt,
 va_list ap
 );
 /**
-* A \c vasprintf like function which allocates space for a string
+* 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.
+* @note The resulting string is guaranteed to be zero-terminated,
-*
+* unless there was in error, in which case the string's pointer
-* @param fmt format string
+* will be @c NULL.
+*
+* @param fmt (@c char*) format string
+* @param ap (@c va_list) argument list
+* @return (@c cxmutstr) 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 (@c CxBuffer*) a pointer to the buffer the data is written to
+* @param fmt (@c char*) the format string
+* @param ... additional arguments
+* @return (@c int) the total number of bytes written or an error code from stdlib printf implementation
+* @see cx_fprintf()
+* @see cxBufferWrite()
+*/
+#define cx_bprintf(buffer, fmt, ...) cx_fprintf((void*)buffer, \
+cxBufferWriteFunc, 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, if successful, is guaranteed to be zero-terminated.
+*
+* @param str (@c char**) a pointer to the string buffer
+* @param len (@c size_t*) a pointer to the length of the buffer
+* @param fmt (@c char*) the format string
+* @param ... additional arguments
+* @return (@c int) the length of produced string or an error code from stdlib printf implementation
+*/
+#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, if successful, 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 or an error code from stdlib printf implementation
+*/
+cx_attr_nonnull_arg(1, 2, 3, 4)
+cx_attr_printf(4, 5)
+cx_attr_cstr_arg(4)
+cx_attr_export
+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, if successful, is guaranteed to be zero-terminated.
+*
+* @param str (@c char**) a pointer to the string buffer
+* @param len (@c size_t*) a pointer to the length of the buffer
+* @param fmt (@c char*) the format string
+* @param ap (@c va_list) argument list
+* @return (@c int) the length of produced string or an error code from stdlib printf implementation
+*/
+#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 formatted string
+* @return the length of produced string or an error code from stdlib printf implementation
-* @see cx_asprintf()
+*/
-*/
+cx_attr_nonnull
-#define cx_vasprintf(fmt, ap) cx_vasprintf_a(cxDefaultAllocator, fmt, ap)
+cx_attr_cstr_arg(4)
+cx_attr_access_rw(2)
-/**
+cx_attr_access_rw(3)
-* A \c printf like function which writes the output to a CxBuffer.
+cx_attr_export
-*
+int cx_vsprintf_a(
-* @param buffer a pointer to the buffer the data is written to
+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, if successful, 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 (@c char*) a pointer to the buffer
+* @param len (@c size_t*) a pointer to the length of the buffer
+* @param str (@c char**) a pointer where the location of the result shall be stored
+* @param fmt (@c char*) the format string
+* @param ... additional arguments
+* @return (@c int) the length of produced string or an error code from stdlib printf implementation
+*/
+#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, if successful, 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 where the location of the result shall be stored
 * @param fmt the format string
 * @param ... additional arguments
-* @return the total number of bytes written
+* @return the length of produced string or an error code from stdlib printf implementation
-* @see ucx_fprintf()
+*/
-*/
+cx_attr_nonnull_arg(1, 2, 4, 5)
-#define cx_bprintf(buffer, fmt, ...) cx_fprintf((CxBuffer*)buffer, \
+cx_attr_printf(5, 6)
-(cx_write_func) cxBufferWrite, fmt, __VA_ARGS__)
+cx_attr_cstr_arg(5)
+cx_attr_access_rw(2)
+cx_attr_access_rw(3)
+cx_attr_access_rw(4)
+cx_attr_export
+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 (@c char*) a pointer to the buffer
+* @param len (@c size_t*) a pointer to the length of the buffer
+* @param str (@c char**) a pointer where the location of the result shall be stored
+* @param fmt (@c char*) the format string
+* @param ap (@c va_list) argument list
+* @return (@c int) the length of produced string or an error code from stdlib printf implementation
+*/
+#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 where the location of the result shall be stored
+* @param fmt the format string
+* @param ap argument list
+* @return the length of produced string or an error code from stdlib printf implementation
+*/
+cx_attr_nonnull
+cx_attr_cstr_arg(5)
+cx_attr_export
+int cx_vsprintf_sa(
+CxAllocator *alloc,
+char *buf,
+size_t *len,
+char **str,
+const char *fmt,
+va_list ap
+);
 #ifdef __cplusplus
 } // extern "C"
 #endif

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comparison: src/ucx/cx/printf.h

src/ucx/cx/printf.h