[deb_ffmpeg.git] / ffmpeg / libavutil / bprint.c

/*
 * Copyright (c) 2012 Nicolas George
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "avassert.h"
#include "avstring.h"
#include "bprint.h"
#include "common.h"
#include "compat/va_copy.h"
#include "error.h"
#include "mem.h"

#define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
#define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)

static int av_bprint_alloc(AVBPrint *buf, unsigned room)
{
    char *old_str, *new_str;
    unsigned min_size, new_size;

    if (buf->size == buf->size_max)
        return AVERROR(EIO);
    if (!av_bprint_is_complete(buf))
        return AVERROR_INVALIDDATA; /* it is already truncated anyway */
    min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
    new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
    if (new_size < min_size)
        new_size = FFMIN(buf->size_max, min_size);
    old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
    new_str = av_realloc(old_str, new_size);
    if (!new_str)
        return AVERROR(ENOMEM);
    if (!old_str)
        memcpy(new_str, buf->str, buf->len + 1);
    buf->str  = new_str;
    buf->size = new_size;
    return 0;
}

static void av_bprint_grow(AVBPrint *buf, unsigned extra_len)
{
    /* arbitrary margin to avoid small overflows */
    extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
    buf->len += extra_len;
    if (buf->size)
        buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
}

void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
{
    unsigned size_auto = (char *)buf + sizeof(*buf) -
                         buf->reserved_internal_buffer;

    if (size_max == 1)
        size_max = size_auto;
    buf->str      = buf->reserved_internal_buffer;
    buf->len      = 0;
    buf->size     = FFMIN(size_auto, size_max);
    buf->size_max = size_max;
    *buf->str = 0;
    if (size_init > buf->size)
        av_bprint_alloc(buf, size_init - 1);
}

void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
{
    buf->str      = buffer;
    buf->len      = 0;
    buf->size     = size;
    buf->size_max = size;
    *buf->str = 0;
}

void av_bprintf(AVBPrint *buf, const char *fmt, ...)
{
    unsigned room;
    char *dst;
    va_list vl;
    int extra_len;

    while (1) {
        room = av_bprint_room(buf);
        dst = room ? buf->str + buf->len : NULL;
        va_start(vl, fmt);
        extra_len = vsnprintf(dst, room, fmt, vl);
        va_end(vl);
        if (extra_len <= 0)
            return;
        if (extra_len < room)
            break;
        if (av_bprint_alloc(buf, extra_len))
            break;
    }
    av_bprint_grow(buf, extra_len);
}

void av_vbprintf(AVBPrint *buf, const char *fmt, va_list vl_arg)
{
    unsigned room;
    char *dst;
    int extra_len;
    va_list vl;

    while (1) {
        room = av_bprint_room(buf);
        dst = room ? buf->str + buf->len : NULL;
        va_copy(vl, vl_arg);
        extra_len = vsnprintf(dst, room, fmt, vl);
        va_end(vl);
        if (extra_len <= 0)
            return;
        if (extra_len < room)
            break;
        if (av_bprint_alloc(buf, extra_len))
            break;
    }
    av_bprint_grow(buf, extra_len);
}

void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
{
    unsigned room, real_n;

    while (1) {
        room = av_bprint_room(buf);
        if (n < room)
            break;
        if (av_bprint_alloc(buf, n))
            break;
    }
    if (room) {
        real_n = FFMIN(n, room - 1);
        memset(buf->str + buf->len, c, real_n);
    }
    av_bprint_grow(buf, n);
}

void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)
{
    unsigned room, real_n;

    while (1) {
        room = av_bprint_room(buf);
        if (size < room)
            break;
        if (av_bprint_alloc(buf, size))
            break;
    }
    if (room) {
        real_n = FFMIN(size, room - 1);
        memcpy(buf->str + buf->len, data, real_n);
    }
    av_bprint_grow(buf, size);
}

void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
{
    unsigned room;
    size_t l;

    if (!*fmt)
        return;
    while (1) {
        room = av_bprint_room(buf);
        if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
            break;
        /* strftime does not tell us how much room it would need: let us
           retry with twice as much until the buffer is large enough */
        room = !room ? strlen(fmt) + 1 :
               room <= INT_MAX / 2 ? room * 2 : INT_MAX;
        if (av_bprint_alloc(buf, room)) {
            /* impossible to grow, try to manage something useful anyway */
            room = av_bprint_room(buf);
            if (room < 1024) {
                /* if strftime fails because the buffer has (almost) reached
                   its maximum size, let us try in a local buffer; 1k should
                   be enough to format any real date+time string */
                char buf2[1024];
                if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
                    av_bprintf(buf, "%s", buf2);
                    return;
                }
            }
            if (room) {
                /* if anything else failed and the buffer is not already
                   truncated, let us add a stock string and force truncation */
                static const char txt[] = "[truncated strftime output]";
                memset(buf->str + buf->len, '!', room);
                memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
                av_bprint_grow(buf, room); /* force truncation */
            }
            return;
        }
    }
    av_bprint_grow(buf, l);
}

void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
                          unsigned char **mem, unsigned *actual_size)
{
    if (size > av_bprint_room(buf))
        av_bprint_alloc(buf, size);
    *actual_size = av_bprint_room(buf);
    *mem = *actual_size ? buf->str + buf->len : NULL;
}

void av_bprint_clear(AVBPrint *buf)
{
    if (buf->len) {
        *buf->str = 0;
        buf->len  = 0;
    }
}

int av_bprint_finalize(AVBPrint *buf, char **ret_str)
{
    unsigned real_size = FFMIN(buf->len + 1, buf->size);
    char *str;
    int ret = 0;

    if (ret_str) {
        if (av_bprint_is_allocated(buf)) {
            str = av_realloc(buf->str, real_size);
            if (!str)
                str = buf->str;
            buf->str = NULL;
        } else {
            str = av_malloc(real_size);
            if (str)
                memcpy(str, buf->str, real_size);
            else
                ret = AVERROR(ENOMEM);
        }
        *ret_str = str;
    } else {
        if (av_bprint_is_allocated(buf))
            av_freep(&buf->str);
    }
    buf->size = real_size;
    return ret;
}

#define WHITESPACES " \n\t"

void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars,
                      enum AVEscapeMode mode, int flags)
{
    const char *src0 = src;

    if (mode == AV_ESCAPE_MODE_AUTO)
        mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */

    switch (mode) {
    case AV_ESCAPE_MODE_QUOTE:
        /* enclose the string between '' */
        av_bprint_chars(dstbuf, '\'', 1);
        for (; *src; src++) {
            if (*src == '\'')
                av_bprintf(dstbuf, "'\\''");
            else
                av_bprint_chars(dstbuf, *src, 1);
        }
        av_bprint_chars(dstbuf, '\'', 1);
        break;

    /* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
    default:
        /* \-escape characters */
        for (; *src; src++) {
            int is_first_last       = src == src0 || !*(src+1);
            int is_ws               = !!strchr(WHITESPACES, *src);
            int is_strictly_special = special_chars && strchr(special_chars, *src);
            int is_special          =
                is_strictly_special || strchr("'\\", *src) ||
                (is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));

            if (is_strictly_special ||
                (!(flags & AV_ESCAPE_FLAG_STRICT) &&
                 (is_special || (is_ws && is_first_last))))
                av_bprint_chars(dstbuf, '\\', 1);
            av_bprint_chars(dstbuf, *src, 1);
        }
        break;
    }
}

#ifdef TEST

#undef printf

static void bprint_pascal(AVBPrint *b, unsigned size)
{
    unsigned i, j;
    unsigned p[42];

    av_assert0(size < FF_ARRAY_ELEMS(p));

    p[0] = 1;
    av_bprintf(b, "%8d\n", 1);
    for (i = 1; i <= size; i++) {
        p[i] = 1;
        for (j = i - 1; j > 0; j--)
            p[j] = p[j] + p[j - 1];
        for (j = 0; j <= i; j++)
            av_bprintf(b, "%8d", p[j]);
        av_bprintf(b, "\n");
    }
}

int main(void)
{
    AVBPrint b;
    char buf[256];
    struct tm testtime = { .tm_year = 100, .tm_mon = 11, .tm_mday = 20 };

    av_bprint_init(&b, 0, -1);
    bprint_pascal(&b, 5);
    printf("Short text in unlimited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
    printf("%s\n", b.str);
    av_bprint_finalize(&b, NULL);

    av_bprint_init(&b, 0, -1);
    bprint_pascal(&b, 25);
    printf("Long text in unlimited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
    av_bprint_finalize(&b, NULL);

    av_bprint_init(&b, 0, 2048);
    bprint_pascal(&b, 25);
    printf("Long text in limited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
    av_bprint_finalize(&b, NULL);

    av_bprint_init(&b, 0, 1);
    bprint_pascal(&b, 5);
    printf("Short text in automatic buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);

    av_bprint_init(&b, 0, 1);
    bprint_pascal(&b, 25);
    printf("Long text in automatic buffer: %u/%u\n", (unsigned)strlen(b.str)/8*8, b.len);
    /* Note that the size of the automatic buffer is arch-dependent. */

    av_bprint_init(&b, 0, 0);
    bprint_pascal(&b, 25);
    printf("Long text count only buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);

    av_bprint_init_for_buffer(&b, buf, sizeof(buf));
    bprint_pascal(&b, 25);
    printf("Long text count only buffer: %u/%u\n", (unsigned)strlen(buf), b.len);

    av_bprint_init(&b, 0, -1);
    av_bprint_strftime(&b, "%Y-%m-%d", &testtime);
    printf("strftime full: %u/%u \"%s\"\n", (unsigned)strlen(buf), b.len, b.str);
    av_bprint_finalize(&b, NULL);

    av_bprint_init(&b, 0, 8);
    av_bprint_strftime(&b, "%Y-%m-%d", &testtime);
    printf("strftime truncated: %u/%u \"%s\"\n", (unsigned)strlen(buf), b.len, b.str);

    return 0;
}

#endif
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2012 Nicolas George
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <stdarg.h>
	22	#include <stdio.h>
	23	#include <string.h>
	24	#include <time.h>
	25	#include "avassert.h"
	26	#include "avstring.h"
	27	#include "bprint.h"
	28	#include "common.h"
	29	#include "compat/va_copy.h"
	30	#include "error.h"
	31	#include "mem.h"
	32
	33	#define av_bprint_room(buf) ((buf)->size - FFMIN((buf)->len, (buf)->size))
	34	#define av_bprint_is_allocated(buf) ((buf)->str != (buf)->reserved_internal_buffer)
	35
	36	static int av_bprint_alloc(AVBPrint *buf, unsigned room)
	37	{
	38	char old_str, new_str;
	39	unsigned min_size, new_size;
	40
	41	if (buf->size == buf->size_max)
	42	return AVERROR(EIO);
	43	if (!av_bprint_is_complete(buf))
	44	return AVERROR_INVALIDDATA; /* it is already truncated anyway */
	45	min_size = buf->len + 1 + FFMIN(UINT_MAX - buf->len - 1, room);
	46	new_size = buf->size > buf->size_max / 2 ? buf->size_max : buf->size * 2;
	47	if (new_size < min_size)
	48	new_size = FFMIN(buf->size_max, min_size);
	49	old_str = av_bprint_is_allocated(buf) ? buf->str : NULL;
	50	new_str = av_realloc(old_str, new_size);
	51	if (!new_str)
	52	return AVERROR(ENOMEM);
	53	if (!old_str)
	54	memcpy(new_str, buf->str, buf->len + 1);
	55	buf->str = new_str;
	56	buf->size = new_size;
	57	return 0;
	58	}
	59
	60	static void av_bprint_grow(AVBPrint *buf, unsigned extra_len)
	61	{
	62	/* arbitrary margin to avoid small overflows */
	63	extra_len = FFMIN(extra_len, UINT_MAX - 5 - buf->len);
	64	buf->len += extra_len;
65	if (buf->size)
66	buf->str[FFMIN(buf->len, buf->size - 1)] = 0;
67	}
68
69	void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
70	{
71	unsigned size_auto = (char )buf + sizeof(buf) -
72	buf->reserved_internal_buffer;
73
74	if (size_max == 1)
75	size_max = size_auto;
76	buf->str = buf->reserved_internal_buffer;
77	buf->len = 0;
78	buf->size = FFMIN(size_auto, size_max);
79	buf->size_max = size_max;
80	*buf->str = 0;
81	if (size_init > buf->size)
82	av_bprint_alloc(buf, size_init - 1);
83	}
84
85	void av_bprint_init_for_buffer(AVBPrint buf, char buffer, unsigned size)
86	{
87	buf->str = buffer;
88	buf->len = 0;
89	buf->size = size;
90	buf->size_max = size;
91	*buf->str = 0;
92	}
93
94	void av_bprintf(AVBPrint buf, const char fmt, ...)
95	{
96	unsigned room;
97	char *dst;
98	va_list vl;
99	int extra_len;
100
101	while (1) {
102	room = av_bprint_room(buf);
103	dst = room ? buf->str + buf->len : NULL;
104	va_start(vl, fmt);
105	extra_len = vsnprintf(dst, room, fmt, vl);
106	va_end(vl);
107	if (extra_len <= 0)
108	return;
109	if (extra_len < room)
110	break;
111	if (av_bprint_alloc(buf, extra_len))
112	break;
113	}
114	av_bprint_grow(buf, extra_len);
115	}
116
117	void av_vbprintf(AVBPrint buf, const char fmt, va_list vl_arg)
118	{
119	unsigned room;
120	char *dst;
121	int extra_len;
122	va_list vl;
123
124	while (1) {
125	room = av_bprint_room(buf);
126	dst = room ? buf->str + buf->len : NULL;
127	va_copy(vl, vl_arg);
128	extra_len = vsnprintf(dst, room, fmt, vl);
129	va_end(vl);
130	if (extra_len <= 0)
131	return;
132	if (extra_len < room)
133	break;
134	if (av_bprint_alloc(buf, extra_len))
135	break;
136	}
137	av_bprint_grow(buf, extra_len);
138	}
139
140	void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
141	{
142	unsigned room, real_n;
143
144	while (1) {
145	room = av_bprint_room(buf);
146	if (n < room)
147	break;
148	if (av_bprint_alloc(buf, n))
149	break;
150	}
151	if (room) {
152	real_n = FFMIN(n, room - 1);
153	memset(buf->str + buf->len, c, real_n);
154	}
155	av_bprint_grow(buf, n);
156	}
157
158	void av_bprint_append_data(AVBPrint buf, const char data, unsigned size)
159	{
160	unsigned room, real_n;
161
162	while (1) {
163	room = av_bprint_room(buf);
164	if (size < room)
165	break;
166	if (av_bprint_alloc(buf, size))
167	break;
168	}
169	if (room) {
170	real_n = FFMIN(size, room - 1);
171	memcpy(buf->str + buf->len, data, real_n);
172	}
173	av_bprint_grow(buf, size);
174	}
175
176	void av_bprint_strftime(AVBPrint buf, const char fmt, const struct tm *tm)
177	{
178	unsigned room;
179	size_t l;
180
181	if (!*fmt)
182	return;
183	while (1) {
184	room = av_bprint_room(buf);
185	if (room && (l = strftime(buf->str + buf->len, room, fmt, tm)))
186	break;
187	/* strftime does not tell us how much room it would need: let us
188	retry with twice as much until the buffer is large enough */
189	room = !room ? strlen(fmt) + 1 :
190	room <= INT_MAX / 2 ? room * 2 : INT_MAX;
191	if (av_bprint_alloc(buf, room)) {
192	/* impossible to grow, try to manage something useful anyway */
193	room = av_bprint_room(buf);
194	if (room < 1024) {
195	/* if strftime fails because the buffer has (almost) reached
196	its maximum size, let us try in a local buffer; 1k should
197	be enough to format any real date+time string */
198	char buf2[1024];
199	if ((l = strftime(buf2, sizeof(buf2), fmt, tm))) {
200	av_bprintf(buf, "%s", buf2);
201	return;
202	}
203	}
204	if (room) {
205	/* if anything else failed and the buffer is not already
206	truncated, let us add a stock string and force truncation */
207	static const char txt[] = "[truncated strftime output]";
208	memset(buf->str + buf->len, '!', room);
209	memcpy(buf->str + buf->len, txt, FFMIN(sizeof(txt) - 1, room));
210	av_bprint_grow(buf, room); /* force truncation */
211	}
212	return;
213	}
214	}
215	av_bprint_grow(buf, l);
216	}
217
218	void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
219	unsigned char *mem, unsigned actual_size)
220	{
221	if (size > av_bprint_room(buf))
222	av_bprint_alloc(buf, size);
223	*actual_size = av_bprint_room(buf);
224	mem = actual_size ? buf->str + buf->len : NULL;
225	}
226
227	void av_bprint_clear(AVBPrint *buf)
228	{
229	if (buf->len) {
230	*buf->str = 0;
231	buf->len = 0;
232	}
233	}
234
235	int av_bprint_finalize(AVBPrint buf, char *ret_str)
236	{
237	unsigned real_size = FFMIN(buf->len + 1, buf->size);
238	char *str;
239	int ret = 0;
240
241	if (ret_str) {
242	if (av_bprint_is_allocated(buf)) {
243	str = av_realloc(buf->str, real_size);
244	if (!str)
245	str = buf->str;
246	buf->str = NULL;
247	} else {
248	str = av_malloc(real_size);
249	if (str)
250	memcpy(str, buf->str, real_size);
251	else
252	ret = AVERROR(ENOMEM);
253	}
254	*ret_str = str;
255	} else {
256	if (av_bprint_is_allocated(buf))
257	av_freep(&buf->str);
258	}
259	buf->size = real_size;
260	return ret;
261	}
262
263	#define WHITESPACES " \n\t"
264
265	void av_bprint_escape(AVBPrint dstbuf, const char src, const char *special_chars,
266	enum AVEscapeMode mode, int flags)
267	{
268	const char *src0 = src;
269
270	if (mode == AV_ESCAPE_MODE_AUTO)
271	mode = AV_ESCAPE_MODE_BACKSLASH; /* TODO: implement a heuristic */
272
273	switch (mode) {
274	case AV_ESCAPE_MODE_QUOTE:
275	/* enclose the string between '' */
276	av_bprint_chars(dstbuf, '\'', 1);
277	for (; *src; src++) {
278	if (*src == '\'')
279	av_bprintf(dstbuf, "'\\''");
280	else
281	av_bprint_chars(dstbuf, *src, 1);
282	}
283	av_bprint_chars(dstbuf, '\'', 1);
284	break;
285
286	/* case AV_ESCAPE_MODE_BACKSLASH or unknown mode */
287	default:
288	/* \-escape characters */
289	for (; *src; src++) {
290	int is_first_last = src == src0 \|\| !*(src+1);
291	int is_ws = !!strchr(WHITESPACES, *src);
292	int is_strictly_special = special_chars && strchr(special_chars, *src);
293	int is_special =
294	is_strictly_special \|\| strchr("'\\", *src) \|\|
295	(is_ws && (flags & AV_ESCAPE_FLAG_WHITESPACE));
296
297	if (is_strictly_special \|\|
298	(!(flags & AV_ESCAPE_FLAG_STRICT) &&
299	(is_special \|\| (is_ws && is_first_last))))
300	av_bprint_chars(dstbuf, '\\', 1);
301	av_bprint_chars(dstbuf, *src, 1);
302	}
303	break;
304	}
305	}
306
307	#ifdef TEST
308
309	#undef printf
310
311	static void bprint_pascal(AVBPrint *b, unsigned size)
312	{
313	unsigned i, j;
314	unsigned p[42];
315
316	av_assert0(size < FF_ARRAY_ELEMS(p));
317
318	p[0] = 1;
319	av_bprintf(b, "%8d\n", 1);
320	for (i = 1; i <= size; i++) {
321	p[i] = 1;
322	for (j = i - 1; j > 0; j--)
323	p[j] = p[j] + p[j - 1];
324	for (j = 0; j <= i; j++)
325	av_bprintf(b, "%8d", p[j]);
326	av_bprintf(b, "\n");
327	}
328	}
329
330	int main(void)
331	{
332	AVBPrint b;
333	char buf[256];
334	struct tm testtime = { .tm_year = 100, .tm_mon = 11, .tm_mday = 20 };
335
336	av_bprint_init(&b, 0, -1);
337	bprint_pascal(&b, 5);
338	printf("Short text in unlimited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
339	printf("%s\n", b.str);
340	av_bprint_finalize(&b, NULL);
341
342	av_bprint_init(&b, 0, -1);
343	bprint_pascal(&b, 25);
344	printf("Long text in unlimited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
345	av_bprint_finalize(&b, NULL);
346
347	av_bprint_init(&b, 0, 2048);
348	bprint_pascal(&b, 25);
349	printf("Long text in limited buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
350	av_bprint_finalize(&b, NULL);
351
352	av_bprint_init(&b, 0, 1);
353	bprint_pascal(&b, 5);
354	printf("Short text in automatic buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
355
356	av_bprint_init(&b, 0, 1);
357	bprint_pascal(&b, 25);
358	printf("Long text in automatic buffer: %u/%u\n", (unsigned)strlen(b.str)/8*8, b.len);
359	/* Note that the size of the automatic buffer is arch-dependent. */
360
361	av_bprint_init(&b, 0, 0);
362	bprint_pascal(&b, 25);
363	printf("Long text count only buffer: %u/%u\n", (unsigned)strlen(b.str), b.len);
364
365	av_bprint_init_for_buffer(&b, buf, sizeof(buf));
366	bprint_pascal(&b, 25);
367	printf("Long text count only buffer: %u/%u\n", (unsigned)strlen(buf), b.len);
368
369	av_bprint_init(&b, 0, -1);
370	av_bprint_strftime(&b, "%Y-%m-%d", &testtime);
371	printf("strftime full: %u/%u \"%s\"\n", (unsigned)strlen(buf), b.len, b.str);
372	av_bprint_finalize(&b, NULL);
373
374	av_bprint_init(&b, 0, 8);
375	av_bprint_strftime(&b, "%Y-%m-%d", &testtime);
376	printf("strftime truncated: %u/%u \"%s\"\n", (unsigned)strlen(buf), b.len, b.str);
377
378	return 0;
379	}
380
381	#endif