306 lines
8.9 KiB
C
306 lines
8.9 KiB
C
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/*
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* Copyright (c) 2012 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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 <time.h>
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#include "avassert.h"
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#include "avstring.h"
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#include "bprint.h"
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#include "common.h"
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#include "compat/va_copy.h"
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#include "error.h"
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#include "mem.h"
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#define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
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#define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)
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static int av_bprint_alloc(AVBPrint *buf, unsigned room)
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{
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char *old_str, *new_str;
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unsigned min_size, new_size;
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if (buf->size == buf->size_max)
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return AVERROR(EIO);
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if (!av_bprint_is_complete(buf))
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return AVERROR_INVALIDDATA; /* it is already truncated anyway */
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min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
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new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
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if (new_size < min_size)
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new_size = FFMIN(buf->size_max, min_size);
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old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
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new_str = av_realloc(old_str, new_size);
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if (!new_str)
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return AVERROR(ENOMEM);
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if (!old_str)
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memcpy(new_str, buf->str, buf->len + 1);
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buf->str = new_str;
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buf->size = new_size;
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return 0;
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}
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static void av_bprint_grow(AVBPrint *buf, unsigned extra_len)
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{
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/* arbitrary margin to avoid small overflows */
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extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
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buf->len += extra_len;
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if (buf->size)
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buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
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}
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void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
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{
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unsigned size_auto = (char *)buf + sizeof(*buf) -
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buf->reserved_internal_buffer;
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if (size_max == 1)
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size_max = size_auto;
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buf->str = buf->reserved_internal_buffer;
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buf->len = 0;
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buf->size = FFMIN(size_auto, size_max);
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buf->size_max = size_max;
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*buf->str = 0;
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if (size_init > buf->size)
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av_bprint_alloc(buf, size_init - 1);
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}
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void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
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{
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buf->str = buffer;
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buf->len = 0;
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buf->size = size;
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buf->size_max = size;
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*buf->str = 0;
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}
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void av_bprintf(AVBPrint *buf, const char *fmt, ...)
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{
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unsigned room;
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char *dst;
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va_list vl;
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int extra_len;
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while (1) {
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room = av_bprint_room(buf);
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dst = room ? buf->str + buf->len : NULL;
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va_start(vl, fmt);
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extra_len = vsnprintf(dst, room, fmt, vl);
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va_end(vl);
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if (extra_len <= 0)
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return;
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if (extra_len < room)
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break;
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if (av_bprint_alloc(buf, extra_len))
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break;
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}
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av_bprint_grow(buf, extra_len);
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}
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void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
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{
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unsigned room;
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char *dst;
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int extra_len;
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va_list vl;
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while (1) {
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room = av_bprint_room(buf);
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dst = room ? buf->str + buf->len : NULL;
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va_copy(vl, vl_arg);
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extra_len = vsnprintf(dst, room, fmt, vl);
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va_end(vl);
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if (extra_len <= 0)
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return;
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if (extra_len < room)
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break;
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if (av_bprint_alloc(buf, extra_len))
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break;
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}
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av_bprint_grow(buf, extra_len);
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}
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void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
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{
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unsigned room, real_n;
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while (1) {
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room = av_bprint_room(buf);
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if (n < room)
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break;
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if (av_bprint_alloc(buf, n))
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break;
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}
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if (room) {
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real_n = FFMIN(n, room - 1);
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memset(buf->str + buf->len, c, real_n);
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}
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av_bprint_grow(buf, n);
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}
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void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
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{
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unsigned room, real_n;
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while (1) {
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room = av_bprint_room(buf);
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if (size < room)
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break;
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if (av_bprint_alloc(buf, size))
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break;
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}
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if (room) {
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real_n = FFMIN(size, room - 1);
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memcpy(buf->str + buf->len, data, real_n);
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}
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av_bprint_grow(buf, size);
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}
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void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
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{
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unsigned room;
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size_t l;
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if (!*fmt)
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return;
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while (1) {
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room = av_bprint_room(buf);
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if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
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break;
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/* strftime does not tell us how much room it would need: let us
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retry with twice as much until the buffer is large enough */
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room = !room ? strlen(fmt) + 1 :
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room <= INT_MAX / 2 ? room * 2 : INT_MAX;
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if (av_bprint_alloc(buf, room)) {
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/* impossible to grow, try to manage something useful anyway */
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room = av_bprint_room(buf);
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if (room < 1024) {
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/* if strftime fails because the buffer has (almost) reached
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its maximum size, let us try in a local buffer; 1k should
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be enough to format any real date+time string */
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char buf2[1024];
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if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
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av_bprintf(buf, "%s", buf2);
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return;
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}
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}
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if (room) {
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/* if anything else failed and the buffer is not already
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truncated, let us add a stock string and force truncation */
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static const char txt[] = "[truncated strftime output]";
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memset(buf->str + buf->len, '!', room);
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memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
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av_bprint_grow(buf, room); /* force truncation */
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}
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return;
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}
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}
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av_bprint_grow(buf, l);
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}
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void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
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unsigned char **mem, unsigned *actual_size)
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{
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if (size > av_bprint_room(buf))
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av_bprint_alloc(buf, size);
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*actual_size = av_bprint_room(buf);
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*mem = *actual_size ? buf->str + buf->len : NULL;
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}
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void av_bprint_clear(AVBPrint *buf)
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{
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if (buf->len) {
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*buf->str = 0;
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buf->len = 0;
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}
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}
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int av_bprint_finalize(AVBPrint *buf, char **ret_str)
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{
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unsigned real_size = FFMIN(buf->len + 1, buf->size);
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char *str;
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int ret = 0;
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if (ret_str) {
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if (av_bprint_is_allocated(buf)) {
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str = av_realloc(buf->str, real_size);
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if (!str)
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str = buf->str;
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buf->str = NULL;
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} else {
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str = av_malloc(real_size);
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if (str)
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memcpy(str, buf->str, real_size);
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else
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ret = AVERROR(ENOMEM);
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}
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*ret_str = str;
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} else {
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if (av_bprint_is_allocated(buf))
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av_freep(&buf->str);
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}
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buf->size = real_size;
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return ret;
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}
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#define WHITESPACES " \n\t\r"
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void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
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enum AVEscapeMode mode, int flags)
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{
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const char *src0 = src;
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if (mode == AV_ESCAPE_MODE_AUTO)
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mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */
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switch (mode) {
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case AV_ESCAPE_MODE_QUOTE:
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/* enclose the string between '' */
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av_bprint_chars(dstbuf, '\'', 1);
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for (; *src; src++) {
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if (*src == '\'')
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av_bprintf(dstbuf, "'\\''");
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else
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av_bprint_chars(dstbuf, *src, 1);
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}
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av_bprint_chars(dstbuf, '\'', 1);
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break;
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/* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
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default:
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/* \-escape characters */
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for (; *src; src++) {
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int is_first_last = src == src0 || !*(src+1);
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int is_ws = !!strchr(WHITESPACES, *src);
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int is_strictly_special = special_chars && strchr(special_chars, *src);
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int is_special =
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is_strictly_special || strchr("'\\", *src) ||
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(is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));
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if (is_strictly_special ||
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(!(flags & AV_ESCAPE_FLAG_STRICT) &&
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(is_special || (is_ws && is_first_last))))
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av_bprint_chars(dstbuf, '\\', 1);
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av_bprint_chars(dstbuf, *src, 1);
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}
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break;
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}
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}
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