aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/avstring.c
blob: 4c068f5bc57d30a0e44da0f46ad1e62c052faca9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
/*
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 * Copyright (c) 2007 Mans Rullgard
 *
 * 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 <stdint.h>
#include <stdio.h>
#include <string.h>

#include "config.h"
#include "common.h"
#include "mem.h"
#include "avassert.h"
#include "avstring.h"
#include "bprint.h"

int av_strstart(const char *str, const char *pfx, const char **ptr)
{
    while (*pfx && *pfx == *str) {
        pfx++;
        str++;
    }
    if (!*pfx && ptr)
        *ptr = str;
    return !*pfx;
}

int av_stristart(const char *str, const char *pfx, const char **ptr)
{
    while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {
        pfx++;
        str++;
    }
    if (!*pfx && ptr)
        *ptr = str;
    return !*pfx;
}

char *av_stristr(const char *s1, const char *s2)
{
    if (!*s2)
        return (char*)(intptr_t)s1;

    do
        if (av_stristart(s1, s2, NULL))
            return (char*)(intptr_t)s1;
    while (*s1++);

    return NULL;
}

char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)
{
    size_t needle_len = strlen(needle);
    if (!needle_len)
        return (char*)haystack;
    while (hay_length >= needle_len) {
        hay_length--;
        if (!memcmp(haystack, needle, needle_len))
            return (char*)haystack;
        haystack++;
    }
    return NULL;
}

size_t av_strlcpy(char *dst, const char *src, size_t size)
{
    size_t len = 0;
    while (++len < size && *src)
        *dst++ = *src++;
    if (len <= size)
        *dst = 0;
    return len + strlen(src) - 1;
}

size_t av_strlcat(char *dst, const char *src, size_t size)
{
    size_t len = strlen(dst);
    if (size <= len + 1)
        return len + strlen(src);
    return len + av_strlcpy(dst + len, src, size - len);
}

size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
{
    size_t len = strlen(dst);
    va_list vl;

    va_start(vl, fmt);
    len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
    va_end(vl);

    return len;
}

char *av_asprintf(const char *fmt, ...)
{
    char *p = NULL;
    va_list va;
    int len;

    va_start(va, fmt);
    len = vsnprintf(NULL, 0, fmt, va);
    va_end(va);
    if (len < 0)
        goto end;

    p = av_malloc(len + 1);
    if (!p)
        goto end;

    va_start(va, fmt);
    len = vsnprintf(p, len + 1, fmt, va);
    va_end(va);
    if (len < 0)
        av_freep(&p);

end:
    return p;
}

char *av_d2str(double d)
{
    char *str = av_malloc(16);
    if (str)
        snprintf(str, 16, "%f", d);
    return str;
}

#define WHITESPACES " \n\t\r"

char *av_get_token(const char **buf, const char *term)
{
    char *out     = av_malloc(strlen(*buf) + 1);
    char *ret     = out, *end = out;
    const char *p = *buf;
    if (!out)
        return NULL;
    p += strspn(p, WHITESPACES);

    while (*p && !strspn(p, term)) {
        char c = *p++;
        if (c == '\\' && *p) {
            *out++ = *p++;
            end    = out;
        } else if (c == '\'') {
            while (*p && *p != '\'')
                *out++ = *p++;
            if (*p) {
                p++;
                end = out;
            }
        } else {
            *out++ = c;
        }
    }

    do
        *out-- = 0;
    while (out >= end && strspn(out, WHITESPACES));

    *buf = p;

    return ret;
}

char *av_strtok(char *s, const char *delim, char **saveptr)
{
    char *tok;

    if (!s && !(s = *saveptr))
        return NULL;

    /* skip leading delimiters */
    s += strspn(s, delim);

    /* s now points to the first non delimiter char, or to the end of the string */
    if (!*s) {
        *saveptr = NULL;
        return NULL;
    }
    tok = s++;

    /* skip non delimiters */
    s += strcspn(s, delim);
    if (*s) {
        *s = 0;
        *saveptr = s+1;
    } else {
        *saveptr = NULL;
    }

    return tok;
}

int av_strcasecmp(const char *a, const char *b)
{
    uint8_t c1, c2;
    do {
        c1 = av_tolower(*a++);
        c2 = av_tolower(*b++);
    } while (c1 && c1 == c2);
    return c1 - c2;
}

int av_strncasecmp(const char *a, const char *b, size_t n)
{
    uint8_t c1, c2;
    if (n <= 0)
        return 0;
    do {
        c1 = av_tolower(*a++);
        c2 = av_tolower(*b++);
    } while (--n && c1 && c1 == c2);
    return c1 - c2;
}

char *av_strireplace(const char *str, const char *from, const char *to)
{
    char *ret = NULL;
    const char *pstr2, *pstr = str;
    size_t tolen = strlen(to), fromlen = strlen(from);
    AVBPrint pbuf;

    av_bprint_init(&pbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
    while ((pstr2 = av_stristr(pstr, from))) {
        av_bprint_append_data(&pbuf, pstr, pstr2 - pstr);
        pstr = pstr2 + fromlen;
        av_bprint_append_data(&pbuf, to, tolen);
    }
    av_bprint_append_data(&pbuf, pstr, strlen(pstr));
    if (!av_bprint_is_complete(&pbuf)) {
        av_bprint_finalize(&pbuf, NULL);
    } else {
        av_bprint_finalize(&pbuf, &ret);
    }

    return ret;
}

const char *av_basename(const char *path)
{
    char *p = strrchr(path, '/');

#if HAVE_DOS_PATHS
    char *q = strrchr(path, '\\');
    char *d = strchr(path, ':');

    p = FFMAX3(p, q, d);
#endif

    if (!p)
        return path;

    return p + 1;
}

const char *av_dirname(char *path)
{
    char *p = strrchr(path, '/');

#if HAVE_DOS_PATHS
    char *q = strrchr(path, '\\');
    char *d = strchr(path, ':');

    d = d ? d + 1 : d;

    p = FFMAX3(p, q, d);
#endif

    if (!p)
        return ".";

    *p = '\0';

    return path;
}

char *av_append_path_component(const char *path, const char *component)
{
    size_t p_len, c_len;
    char *fullpath;

    if (!path)
        return av_strdup(component);
    if (!component)
        return av_strdup(path);

    p_len = strlen(path);
    c_len = strlen(component);
    if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)
        return NULL;
    fullpath = av_malloc(p_len + c_len + 2);
    if (fullpath) {
        if (p_len) {
            av_strlcpy(fullpath, path, p_len + 1);
            if (c_len) {
                if (fullpath[p_len - 1] != '/' && component[0] != '/')
                    fullpath[p_len++] = '/';
                else if (fullpath[p_len - 1] == '/' && component[0] == '/')
                    p_len--;
            }
        }
        av_strlcpy(&fullpath[p_len], component, c_len + 1);
        fullpath[p_len + c_len] = 0;
    }
    return fullpath;
}

int av_escape(char **dst, const char *src, const char *special_chars,
              enum AVEscapeMode mode, int flags)
{
    AVBPrint dstbuf;

    av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
    av_bprint_escape(&dstbuf, src, special_chars, mode, flags);

    if (!av_bprint_is_complete(&dstbuf)) {
        av_bprint_finalize(&dstbuf, NULL);
        return AVERROR(ENOMEM);
    } else {
        av_bprint_finalize(&dstbuf, dst);
        return dstbuf.len;
    }
}

int av_match_name(const char *name, const char *names)
{
    const char *p;
    int len, namelen;

    if (!name || !names)
        return 0;

    namelen = strlen(name);
    while (*names) {
        int negate = '-' == *names;
        p = strchr(names, ',');
        if (!p)
            p = names + strlen(names);
        names += negate;
        len = FFMAX(p - names, namelen);
        if (!av_strncasecmp(name, names, len) || !strncmp("ALL", names, FFMAX(3, p - names)))
            return !negate;
        names = p + (*p == ',');
    }
    return 0;
}

int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
                   unsigned int flags)
{
    const uint8_t *p = *bufp;
    uint32_t top;
    uint64_t code;
    int ret = 0, tail_len;
    uint32_t overlong_encoding_mins[6] = {
        0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,
    };

    if (p >= buf_end)
        return 0;

    code = *p++;

    /* first sequence byte starts with 10, or is 1111-1110 or 1111-1111,
       which is not admitted */
    if ((code & 0xc0) == 0x80 || code >= 0xFE) {
        ret = AVERROR(EILSEQ);
        goto end;
    }
    top = (code & 128) >> 1;

    tail_len = 0;
    while (code & top) {
        int tmp;
        tail_len++;
        if (p >= buf_end) {
            (*bufp) ++;
            return AVERROR(EILSEQ); /* incomplete sequence */
        }

        /* we assume the byte to be in the form 10xx-xxxx */
        tmp = *p++ - 128;   /* strip leading 1 */
        if (tmp>>6) {
            (*bufp) ++;
            return AVERROR(EILSEQ);
        }
        code = (code<<6) + tmp;
        top <<= 5;
    }
    code &= (top << 1) - 1;

    /* check for overlong encodings */
    av_assert0(tail_len <= 5);
    if (code < overlong_encoding_mins[tail_len]) {
        ret = AVERROR(EILSEQ);
        goto end;
    }

    if (code >= 1U<<31) {
        ret = AVERROR(EILSEQ);  /* out-of-range value */
        goto end;
    }

    *codep = code;

    if (code > 0x10FFFF &&
        !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES))
        ret = AVERROR(EILSEQ);
    if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD &&
        flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES)
        ret = AVERROR(EILSEQ);
    if (code >= 0xD800 && code <= 0xDFFF &&
        !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES))
        ret = AVERROR(EILSEQ);
    if ((code == 0xFFFE || code == 0xFFFF) &&
        !(flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS))
        ret = AVERROR(EILSEQ);

end:
    *bufp = p;
    return ret;
}

int av_match_list(const char *name, const char *list, char separator)
{
    const char *p, *q;

    for (p = name; p && *p; ) {
        for (q = list; q && *q; ) {
            int k;
            for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)
                if (k && (!p[k] || p[k] == separator))
                    return 1;
            q = strchr(q, separator);
            q += !!q;
        }
        p = strchr(p, separator);
        p += !!p;
    }

    return 0;
}