64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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stdio/vsnprintf.cpp
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Prints a formatted string to the supplied buffer.
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*******************************************************************************/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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struct vsnprintf
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{
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char* str;
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size_t size;
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size_t written;
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};
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static size_t vsnprintf_callback(void* ctx, const char* string, size_t length)
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{
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struct vsnprintf* state = (struct vsnprintf*) ctx;
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if ( 1 <= state->size && state->written < state->size )
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{
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size_t available = state->size - state->written;
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size_t possible = length < available ? length : available;
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memcpy(state->str + state->written, string, possible);
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state->written += possible;
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}
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return length;
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}
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extern "C"
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int vsnprintf(char* restrict str,
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size_t size,
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const char* restrict format,
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va_list list)
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{
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struct vsnprintf state;
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state.str = str;
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state.size = size ? size - 1 : 0;
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state.written = 0;
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int result = vcbprintf(&state, vsnprintf_callback, format, list);
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if ( 1 <= size )
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state.str[state.written] = '\0';
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return result;
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}
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