58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdio/vsnprintf.c
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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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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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