92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* Copyright (c) 2014, 2015, 2022 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/vasprintf.c
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* Prints a string to a newly allocated 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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#include <stdlib.h>
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struct vasprintf
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{
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char* buffer;
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size_t used;
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size_t size;
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#ifdef __TRACE_ALLOCATION_SITES
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struct __allocation_site* allocation_site;
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#endif
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};
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static size_t vasprintf_callback(void* ctx, const char* string, size_t length)
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{
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struct vasprintf* state = (struct vasprintf*) ctx;
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size_t needed_size = state->used + length + 1;
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if ( state->size < needed_size )
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{
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// TODO: Overflow check.
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size_t new_size = 2 * state->size;
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if ( new_size < needed_size )
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new_size = needed_size;
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#ifdef __TRACE_ALLOCATION_SITES
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char* new_buffer = (char*) realloc_trace(state->allocation_site,
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state->buffer, new_size);
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#else
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char* new_buffer = (char*) realloc(state->buffer, new_size);
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#endif
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if ( !new_buffer )
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{
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free(state->buffer);
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state->buffer = NULL;
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return 0;
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}
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state->buffer = new_buffer;
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state->size = new_size;
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}
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memcpy(state->buffer + state->used, string, length);
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state->used += length;
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return length;
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}
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#ifdef __TRACE_ALLOCATION_SITES
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int vasprintf_trace(struct __allocation_site* allocation_site,
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char** restrict result_ptr,
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const char* restrict format,
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va_list list)
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#else
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int vasprintf(char** restrict result_ptr,
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const char* restrict format,
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va_list list)
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#endif
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{
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struct vasprintf state;
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state.used = 0;
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state.size = 32;
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#ifdef __TRACE_ALLOCATION_SITES
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state.allocation_site = allocation_site;
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if ( !(state.buffer = (char*) malloc_trace(allocation_site, state.size)) )
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#else
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if ( !(state.buffer = (char*) malloc(state.size)) )
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#endif
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return -1;
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int result = vcbprintf(&state, vasprintf_callback, format, list);
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if ( !state.buffer )
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return -1;
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state.buffer[state.used] = '\0';
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return *result_ptr = state.buffer, result;
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}
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