96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*
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va.h
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Definitions common to client and server.
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 2000 Marcus Sundberg <mackan@stacken.kth.se>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __QF_va_h
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#define __QF_va_h
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/** \addtogroup misc
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Formatted printing.
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*/
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///@{
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/** Opaque context for va so it can have per-thread data.
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*/
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typedef struct va_ctx_s va_ctx_t;
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/** Create a va context with the specified number of buffers.
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*
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* Having multiple buffers allows va to be used in short chains.
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*
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* \param buffers The number of buffers to create in the context. va() will
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* cycle through the buffers for each call.
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* \return Pointer to the context. Pass to va() for thread-safe usage.
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*/
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va_ctx_t *va_create_context (int buffers);
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/** Destroy a va context.
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*
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* \param ctx The context to be destroyed. Must have been created by
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* va_create_context().
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* \note Any pointers to strings returned by va() using the context
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* referenced by \a ctx will become invalid as the backing
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* memory for the strings will have been freed.
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*/
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void va_destroy_context (va_ctx_t *ctx);
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/** Does a varargs printf into a private buffer.
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*
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* \param ctx Context used for storing the private buffer such that va
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* can be used in a multi-threaded environment. If null then
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* a static context is used, in which case va is NOT
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* thread-safe.
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* \param format Standard printf() format string.
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* \return Pointer to the beginning of the output string. The memory
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* for the returned string is owned by the context pointed to
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* by \a ctx.
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* \note The static context is created with 4 buffers, so va (0,...)
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* can be used to produce mildly complex output (eg, 3 calls
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* to va sent to a 4th) with a reduced risk of strings being
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* trampled.
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*/
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const char *va(va_ctx_t *ctx, const char *format, ...) __attribute__((format(PRINTF,2,3)));
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/** Does a varargs printf into a malloced buffer.
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*
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* Combines the effect of strdup and sprintf, but in a safe manner. Essentially
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* the equivalent of strdup (va (ctx, format, ...));
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*
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* \param format Standard printf() format string.
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* \return Pointer to the beginning of the output string. The caller
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* is responsible for freeing the memory holding the string.
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* \note As nva() creates a new buffer every time it is called, it
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* is thread-safe and there is no risk of the string being
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* trampled. In addition, it does not use va(), so combining
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* nva() with va() is safe.
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*/
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char *nva(const char *format, ...) __attribute__((format(PRINTF,1,2)));
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///@}
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#endif//__QF_va_h
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