mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/****************************************************************************
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**
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** Copyright (C) 2015 Intel Corporation
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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** copies of the Software, and to permit persons to whom the Software is
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** furnished to do so, subject to the following conditions:
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**
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** The above copyright notice and this permission notice shall be included in
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** all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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** THE SOFTWARE.
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**
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****************************************************************************/
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#define _BSD_SOURCE 1
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#define _DEFAULT_SOURCE 1
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#define _GNU_SOURCE 1
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(__unix__) || defined(__APPLE__)
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# include <unistd.h>
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#endif
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#if defined(__APPLE__) || defined(__ANDROID__) || defined(ANDROID)
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typedef int RetType;
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typedef int LenType;
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#elif __GLIBC__
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typedef ssize_t RetType;
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typedef size_t LenType;
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#else
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# error "Cannot implement open_memstream!"
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#endif
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#include "compilersupport_p.h"
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struct Buffer {
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char **ptr;
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size_t *len;
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size_t alloc;
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};
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static RetType write_to_buffer(void *cookie, const char *data, LenType len) {
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struct Buffer *b = (struct Buffer *)cookie;
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char *ptr = *b->ptr;
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size_t newsize;
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errno = EFBIG;
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if (unlikely(add_check_overflow(*b->len, len, &newsize)))
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return -1;
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if (newsize >= b->alloc) { // NB! one extra byte is needed to avoid buffer overflow at close_buffer
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// make room
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size_t newalloc = newsize + newsize / 2 + 1; // give 50% more room
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char *tmp = realloc(ptr, newalloc);
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if (tmp == NULL) {
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free(ptr);
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return -1;
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} else {
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ptr = tmp;
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}
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b->alloc = newalloc;
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*b->ptr = ptr;
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}
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memcpy(ptr + *b->len, data, len);
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*b->len = newsize;
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return len;
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}
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static int close_buffer(void *cookie) {
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struct Buffer *b = (struct Buffer *)cookie;
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if (*b->ptr)
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(*b->ptr)[*b->len] = '\0';
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free(b);
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return 0;
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}
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FILE *open_memstream(char **bufptr, size_t *lenptr) {
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struct Buffer *b = (struct Buffer *)calloc(sizeof(struct Buffer), sizeof(uint8_t));
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if (b == NULL)
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return NULL;
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b->alloc = 0;
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b->len = lenptr;
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b->ptr = bufptr;
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*bufptr = NULL;
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*lenptr = 0;
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#if defined(__APPLE__) || defined(__ANDROID__) || defined(ANDROID)
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return funopen(b, NULL, write_to_buffer, NULL, close_buffer);
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#elif __GLIBC__
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static const cookie_io_functions_t vtable = {
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NULL,
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write_to_buffer,
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NULL,
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close_buffer
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};
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return fopencookie(b, "w", vtable);
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#endif
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}
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