mirror of
https://github.com/FFmpeg/FFmpeg.git
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lavu: add locale-independent sscanf implementation
Copied and adopted from musl implementation. * converted all 'long double' to 'double' * removed %m support
This commit is contained in:
Paul B Mahol
parent
7a73cca254
commit
4b30726dd3
@ -94,6 +94,7 @@ OBJS = adler32.o \
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aes_ctr.o \
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audio_fifo.o \
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avstring.o \
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avsscanf.o \
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base64.o \
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blowfish.o \
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bprint.o \
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971
libavutil/avsscanf.c
Normal file
971
libavutil/avsscanf.c
Normal file
@ -0,0 +1,971 @@
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/*
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* Copyright (c) 2005-2014 Rich Felker, et al.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <float.h>
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#include "config.h"
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#include "common.h"
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#include "mem.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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typedef struct FFFILE {
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size_t buf_size;
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unsigned char *buf;
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unsigned char *rpos, *rend;
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unsigned char *shend;
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off_t shlim, shcnt;
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void *cookie;
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size_t (*read)(struct FFFILE *, unsigned char *, size_t);
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} FFFILE;
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#define SIZE_hh -2
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#define SIZE_h -1
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#define SIZE_def 0
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#define SIZE_l 1
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#define SIZE_L 2
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#define SIZE_ll 3
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#define shcnt(f) ((f)->shcnt + ((f)->rpos - (f)->buf))
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static int fftoread(FFFILE *f)
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{
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f->rpos = f->rend = f->buf + f->buf_size;
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return 0;
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}
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static size_t ffstring_read(FFFILE *f, unsigned char *buf, size_t len)
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{
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char *src = f->cookie;
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size_t k = len+256;
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char *end = memchr(src, 0, k);
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if (end) k = end-src;
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if (k < len) len = k;
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memcpy(buf, src, len);
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f->rpos = (void *)(src+len);
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f->rend = (void *)(src+k);
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f->cookie = src+k;
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return len;
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}
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static int ffuflow(FFFILE *f)
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{
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unsigned char c;
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if (!fftoread(f) && f->read(f, &c, 1)==1) return c;
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return EOF;
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}
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static void ffshlim(FFFILE *f, off_t lim)
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{
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f->shlim = lim;
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f->shcnt = f->buf - f->rpos;
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/* If lim is nonzero, rend must be a valid pointer. */
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if (lim && f->rend - f->rpos > lim)
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f->shend = f->rpos + lim;
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else
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f->shend = f->rend;
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}
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static int ffshgetc(FFFILE *f)
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{
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int c;
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off_t cnt = shcnt(f);
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if (f->shlim && cnt >= f->shlim || (c=ffuflow(f)) < 0) {
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f->shcnt = f->buf - f->rpos + cnt;
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f->shend = 0;
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return EOF;
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}
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cnt++;
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if (f->shlim && f->rend - f->rpos > f->shlim - cnt)
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f->shend = f->rpos + (f->shlim - cnt);
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else
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f->shend = f->rend;
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f->shcnt = f->buf - f->rpos + cnt;
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if (f->rpos[-1] != c) f->rpos[-1] = c;
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return c;
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}
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#define shlim(f, lim) ffshlim((f), (lim))
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#define shgetc(f) (((f)->rpos != (f)->shend) ? *(f)->rpos++ : ffshgetc(f))
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#define shunget(f) ((f)->shend ? (void)(f)->rpos-- : (void)0)
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static const unsigned char table[] = { -1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
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-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
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25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
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-1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
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25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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};
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static unsigned long long ffintscan(FFFILE *f, unsigned base, int pok, unsigned long long lim)
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{
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const unsigned char *val = table+1;
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int c, neg=0;
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unsigned x;
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unsigned long long y;
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if (base > 36 || base == 1) {
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errno = EINVAL;
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return 0;
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}
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while (av_isspace((c=shgetc(f))));
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if (c=='+' || c=='-') {
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neg = -(c=='-');
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c = shgetc(f);
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}
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if ((base == 0 || base == 16) && c=='0') {
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c = shgetc(f);
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if ((c|32)=='x') {
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c = shgetc(f);
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if (val[c]>=16) {
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shunget(f);
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if (pok) shunget(f);
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else shlim(f, 0);
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return 0;
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}
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base = 16;
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} else if (base == 0) {
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base = 8;
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}
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} else {
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if (base == 0) base = 10;
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if (val[c] >= base) {
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shunget(f);
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shlim(f, 0);
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errno = EINVAL;
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return 0;
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}
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}
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if (base == 10) {
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for (x=0; c-'0'<10U && x<=UINT_MAX/10-1; c=shgetc(f))
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x = x*10 + (c-'0');
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for (y=x; c-'0'<10U && y<=ULLONG_MAX/10 && 10*y<=ULLONG_MAX-(c-'0'); c=shgetc(f))
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y = y*10 + (c-'0');
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if (c-'0'>=10U) goto done;
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} else if (!(base & base-1)) {
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int bs = "\0\1\2\4\7\3\6\5"[(0x17*base)>>5&7];
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for (x=0; val[c]<base && x<=UINT_MAX/32; c=shgetc(f))
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x = x<<bs | val[c];
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for (y=x; val[c]<base && y<=ULLONG_MAX>>bs; c=shgetc(f))
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y = y<<bs | val[c];
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} else {
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for (x=0; val[c]<base && x<=UINT_MAX/36-1; c=shgetc(f))
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x = x*base + val[c];
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for (y=x; val[c]<base && y<=ULLONG_MAX/base && base*y<=ULLONG_MAX-val[c]; c=shgetc(f))
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y = y*base + val[c];
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}
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if (val[c]<base) {
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for (; val[c]<base; c=shgetc(f));
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errno = ERANGE;
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y = lim;
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if (lim&1) neg = 0;
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}
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done:
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shunget(f);
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if (y>=lim) {
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if (!(lim&1) && !neg) {
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errno = ERANGE;
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return lim-1;
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} else if (y>lim) {
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errno = ERANGE;
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return lim;
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}
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}
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return (y^neg)-neg;
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}
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static long long scanexp(FFFILE *f, int pok)
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{
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int c;
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int x;
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long long y;
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int neg = 0;
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c = shgetc(f);
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if (c=='+' || c=='-') {
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neg = (c=='-');
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c = shgetc(f);
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if (c-'0'>=10U && pok) shunget(f);
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}
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if (c-'0'>=10U) {
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shunget(f);
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return LLONG_MIN;
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}
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for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
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x = 10*x + c-'0';
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for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
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y = 10*y + c-'0';
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for (; c-'0'<10U; c = shgetc(f));
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shunget(f);
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return neg ? -y : y;
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}
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#define LD_B1B_DIG 2
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#define LD_B1B_MAX 9007199, 254740991
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#define KMAX 128
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#define MASK (KMAX-1)
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#define CONCAT2(x,y) x ## y
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#define CONCAT(x,y) CONCAT2(x,y)
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static double decfloat(FFFILE *f, int c, int bits, int emin, int sign, int pok)
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{
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uint32_t x[KMAX];
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static const uint32_t th[] = { LD_B1B_MAX };
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int i, j, k, a, z;
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long long lrp=0, dc=0;
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long long e10=0;
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int lnz = 0;
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int gotdig = 0, gotrad = 0;
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int rp;
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int e2;
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int emax = -emin-bits+3;
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int denormal = 0;
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double y;
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double frac=0;
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double bias=0;
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static const int p10s[] = { 10, 100, 1000, 10000,
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100000, 1000000, 10000000, 100000000 };
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j=0;
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k=0;
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/* Don't let leading zeros consume buffer space */
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for (; c=='0'; c = shgetc(f)) gotdig=1;
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if (c=='.') {
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gotrad = 1;
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for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
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}
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x[0] = 0;
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for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
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if (c == '.') {
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if (gotrad) break;
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gotrad = 1;
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lrp = dc;
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} else if (k < KMAX-3) {
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dc++;
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if (c!='0') lnz = dc;
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if (j) x[k] = x[k]*10 + c-'0';
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else x[k] = c-'0';
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if (++j==9) {
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k++;
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j=0;
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}
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gotdig=1;
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} else {
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dc++;
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if (c!='0') {
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lnz = (KMAX-4)*9;
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x[KMAX-4] |= 1;
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}
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}
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}
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if (!gotrad) lrp=dc;
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if (gotdig && (c|32)=='e') {
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e10 = scanexp(f, pok);
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if (e10 == LLONG_MIN) {
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if (pok) {
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shunget(f);
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} else {
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shlim(f, 0);
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return 0;
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}
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e10 = 0;
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}
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lrp += e10;
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} else if (c>=0) {
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shunget(f);
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}
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if (!gotdig) {
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errno = EINVAL;
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shlim(f, 0);
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return 0;
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}
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/* Handle zero specially to avoid nasty special cases later */
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if (!x[0]) return sign * 0.0;
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/* Optimize small integers (w/no exponent) and over/under-flow */
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if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0))
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return sign * (double)x[0];
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if (lrp > -emin/2) {
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errno = ERANGE;
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return sign * DBL_MAX * DBL_MAX;
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}
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if (lrp < emin-2*DBL_MANT_DIG) {
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errno = ERANGE;
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return sign * DBL_MIN * DBL_MIN;
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}
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/* Align incomplete final B1B digit */
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if (j) {
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for (; j<9; j++) x[k]*=10;
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k++;
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j=0;
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}
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a = 0;
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z = k;
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e2 = 0;
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rp = lrp;
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/* Optimize small to mid-size integers (even in exp. notation) */
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if (lnz<9 && lnz<=rp && rp < 18) {
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if (rp == 9) return sign * (double)x[0];
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if (rp < 9) return sign * (double)x[0] / p10s[8-rp];
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int bitlim = bits-3*(int)(rp-9);
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if (bitlim>30 || x[0]>>bitlim==0)
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return sign * (double)x[0] * p10s[rp-10];
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}
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/* Drop trailing zeros */
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for (; !x[z-1]; z--);
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/* Align radix point to B1B digit boundary */
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if (rp % 9) {
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int rpm9 = rp>=0 ? rp%9 : rp%9+9;
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int p10 = p10s[8-rpm9];
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uint32_t carry = 0;
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for (k=a; k!=z; k++) {
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uint32_t tmp = x[k] % p10;
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x[k] = x[k]/p10 + carry;
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carry = 1000000000/p10 * tmp;
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if (k==a && !x[k]) {
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a = (a+1 & MASK);
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rp -= 9;
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}
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}
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if (carry) x[z++] = carry;
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rp += 9-rpm9;
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}
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/* Upscale until desired number of bits are left of radix point */
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while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
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uint32_t carry = 0;
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e2 -= 29;
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for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
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uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
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if (tmp > 1000000000) {
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carry = tmp / 1000000000;
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x[k] = tmp % 1000000000;
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} else {
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carry = 0;
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x[k] = tmp;
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}
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if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
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if (k==a) break;
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}
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if (carry) {
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rp += 9;
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a = (a-1 & MASK);
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if (a == z) {
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z = (z-1 & MASK);
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x[z-1 & MASK] |= x[z];
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}
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x[a] = carry;
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}
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}
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/* Downscale until exactly number of bits are left of radix point */
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for (;;) {
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uint32_t carry = 0;
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int sh = 1;
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for (i=0; i<LD_B1B_DIG; i++) {
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k = (a+i & MASK);
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if (k == z || x[k] < th[i]) {
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i=LD_B1B_DIG;
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break;
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}
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if (x[a+i & MASK] > th[i]) break;
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}
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if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
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/* FIXME: find a way to compute optimal sh */
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if (rp > 9+9*LD_B1B_DIG) sh = 9;
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e2 += sh;
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for (k=a; k!=z; k=(k+1 & MASK)) {
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uint32_t tmp = x[k] & (1<<sh)-1;
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x[k] = (x[k]>>sh) + carry;
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carry = (1000000000>>sh) * tmp;
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if (k==a && !x[k]) {
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a = (a+1 & MASK);
|
||||
i--;
|
||||
rp -= 9;
|
||||
}
|
||||
}
|
||||
if (carry) {
|
||||
if ((z+1 & MASK) != a) {
|
||||
x[z] = carry;
|
||||
z = (z+1 & MASK);
|
||||
} else x[z-1 & MASK] |= 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Assemble desired bits into floating point variable */
|
||||
for (y=i=0; i<LD_B1B_DIG; i++) {
|
||||
if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
|
||||
y = 1000000000.0L * y + x[a+i & MASK];
|
||||
}
|
||||
|
||||
y *= sign;
|
||||
|
||||
/* Limit precision for denormal results */
|
||||
if (bits > DBL_MANT_DIG+e2-emin) {
|
||||
bits = DBL_MANT_DIG+e2-emin;
|
||||
if (bits<0) bits=0;
|
||||
denormal = 1;
|
||||
}
|
||||
|
||||
/* Calculate bias term to force rounding, move out lower bits */
|
||||
if (bits < DBL_MANT_DIG) {
|
||||
bias = copysignl(scalbn(1, 2*DBL_MANT_DIG-bits-1), y);
|
||||
frac = fmodl(y, scalbn(1, DBL_MANT_DIG-bits));
|
||||
y -= frac;
|
||||
y += bias;
|
||||
}
|
||||
|
||||
/* Process tail of decimal input so it can affect rounding */
|
||||
if ((a+i & MASK) != z) {
|
||||
uint32_t t = x[a+i & MASK];
|
||||
if (t < 500000000 && (t || (a+i+1 & MASK) != z))
|
||||
frac += 0.25*sign;
|
||||
else if (t > 500000000)
|
||||
frac += 0.75*sign;
|
||||
else if (t == 500000000) {
|
||||
if ((a+i+1 & MASK) == z)
|
||||
frac += 0.5*sign;
|
||||
else
|
||||
frac += 0.75*sign;
|
||||
}
|
||||
if (DBL_MANT_DIG-bits >= 2 && !fmodl(frac, 1))
|
||||
frac++;
|
||||
}
|
||||
|
||||
y += frac;
|
||||
y -= bias;
|
||||
|
||||
if ((e2+DBL_MANT_DIG & INT_MAX) > emax-5) {
|
||||
if (fabs(y) >= CONCAT(0x1p, DBL_MANT_DIG)) {
|
||||
if (denormal && bits==DBL_MANT_DIG+e2-emin)
|
||||
denormal = 0;
|
||||
y *= 0.5;
|
||||
e2++;
|
||||
}
|
||||
if (e2+DBL_MANT_DIG>emax || (denormal && frac))
|
||||
errno = ERANGE;
|
||||
}
|
||||
|
||||
return scalbnl(y, e2);
|
||||
}
|
||||
|
||||
static double hexfloat(FFFILE *f, int bits, int emin, int sign, int pok)
|
||||
{
|
||||
uint32_t x = 0;
|
||||
double y = 0;
|
||||
double scale = 1;
|
||||
double bias = 0;
|
||||
int gottail = 0, gotrad = 0, gotdig = 0;
|
||||
long long rp = 0;
|
||||
long long dc = 0;
|
||||
long long e2 = 0;
|
||||
int d;
|
||||
int c;
|
||||
|
||||
c = shgetc(f);
|
||||
|
||||
/* Skip leading zeros */
|
||||
for (; c=='0'; c = shgetc(f))
|
||||
gotdig = 1;
|
||||
|
||||
if (c=='.') {
|
||||
gotrad = 1;
|
||||
c = shgetc(f);
|
||||
/* Count zeros after the radix point before significand */
|
||||
for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
|
||||
}
|
||||
|
||||
for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
|
||||
if (c=='.') {
|
||||
if (gotrad) break;
|
||||
rp = dc;
|
||||
gotrad = 1;
|
||||
} else {
|
||||
gotdig = 1;
|
||||
if (c > '9') d = (c|32)+10-'a';
|
||||
else d = c-'0';
|
||||
if (dc<8) {
|
||||
x = x*16 + d;
|
||||
} else if (dc < DBL_MANT_DIG/4+1) {
|
||||
y += d*(scale/=16);
|
||||
} else if (d && !gottail) {
|
||||
y += 0.5*scale;
|
||||
gottail = 1;
|
||||
}
|
||||
dc++;
|
||||
}
|
||||
}
|
||||
if (!gotdig) {
|
||||
shunget(f);
|
||||
if (pok) {
|
||||
shunget(f);
|
||||
if (gotrad) shunget(f);
|
||||
} else {
|
||||
shlim(f, 0);
|
||||
}
|
||||
return sign * 0.0;
|
||||
}
|
||||
if (!gotrad) rp = dc;
|
||||
while (dc<8) x *= 16, dc++;
|
||||
if ((c|32)=='p') {
|
||||
e2 = scanexp(f, pok);
|
||||
if (e2 == LLONG_MIN) {
|
||||
if (pok) {
|
||||
shunget(f);
|
||||
} else {
|
||||
shlim(f, 0);
|
||||
return 0;
|
||||
}
|
||||
e2 = 0;
|
||||
}
|
||||
} else {
|
||||
shunget(f);
|
||||
}
|
||||
e2 += 4*rp - 32;
|
||||
|
||||
if (!x) return sign * 0.0;
|
||||
if (e2 > -emin) {
|
||||
errno = ERANGE;
|
||||
return sign * DBL_MAX * DBL_MAX;
|
||||
}
|
||||
if (e2 < emin-2*DBL_MANT_DIG) {
|
||||
errno = ERANGE;
|
||||
return sign * DBL_MIN * DBL_MIN;
|
||||
}
|
||||
|
||||
while (x < 0x80000000) {
|
||||
if (y>=0.5) {
|
||||
x += x + 1;
|
||||
y += y - 1;
|
||||
} else {
|
||||
x += x;
|
||||
y += y;
|
||||
}
|
||||
e2--;
|
||||
}
|
||||
|
||||
if (bits > 32+e2-emin) {
|
||||
bits = 32+e2-emin;
|
||||
if (bits<0) bits=0;
|
||||
}
|
||||
|
||||
if (bits < DBL_MANT_DIG)
|
||||
bias = copysignl(scalbn(1, 32+DBL_MANT_DIG-bits-1), sign);
|
||||
|
||||
if (bits<32 && y && !(x&1)) x++, y=0;
|
||||
|
||||
y = bias + sign*(double)x + sign*y;
|
||||
y -= bias;
|
||||
|
||||
if (!y) errno = ERANGE;
|
||||
|
||||
return scalbnl(y, e2);
|
||||
}
|
||||
|
||||
static double fffloatscan(FFFILE *f, int prec, int pok)
|
||||
{
|
||||
int sign = 1;
|
||||
size_t i;
|
||||
int bits;
|
||||
int emin;
|
||||
int c;
|
||||
|
||||
switch (prec) {
|
||||
case 0:
|
||||
bits = FLT_MANT_DIG;
|
||||
emin = FLT_MIN_EXP-bits;
|
||||
break;
|
||||
case 1:
|
||||
bits = DBL_MANT_DIG;
|
||||
emin = DBL_MIN_EXP-bits;
|
||||
break;
|
||||
case 2:
|
||||
bits = DBL_MANT_DIG;
|
||||
emin = DBL_MIN_EXP-bits;
|
||||
break;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
|
||||
while (av_isspace((c = shgetc(f))));
|
||||
|
||||
if (c=='+' || c=='-') {
|
||||
sign -= 2*(c=='-');
|
||||
c = shgetc(f);
|
||||
}
|
||||
|
||||
for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
|
||||
if (i<7) c = shgetc(f);
|
||||
if (i==3 || i==8 || (i>3 && pok)) {
|
||||
if (i!=8) {
|
||||
shunget(f);
|
||||
if (pok) for (; i>3; i--) shunget(f);
|
||||
}
|
||||
return sign * INFINITY;
|
||||
}
|
||||
if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
|
||||
if (i<2) c = shgetc(f);
|
||||
if (i==3) {
|
||||
if (shgetc(f) != '(') {
|
||||
shunget(f);
|
||||
return NAN;
|
||||
}
|
||||
for (i=1; ; i++) {
|
||||
c = shgetc(f);
|
||||
if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
|
||||
continue;
|
||||
if (c==')') return NAN;
|
||||
shunget(f);
|
||||
if (!pok) {
|
||||
errno = EINVAL;
|
||||
shlim(f, 0);
|
||||
return 0;
|
||||
}
|
||||
while (i--) shunget(f);
|
||||
return NAN;
|
||||
}
|
||||
return NAN;
|
||||
}
|
||||
|
||||
if (i) {
|
||||
shunget(f);
|
||||
errno = EINVAL;
|
||||
shlim(f, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (c=='0') {
|
||||
c = shgetc(f);
|
||||
if ((c|32) == 'x')
|
||||
return hexfloat(f, bits, emin, sign, pok);
|
||||
shunget(f);
|
||||
c = '0';
|
||||
}
|
||||
|
||||
return decfloat(f, c, bits, emin, sign, pok);
|
||||
}
|
||||
|
||||
static void *arg_n(va_list ap, unsigned int n)
|
||||
{
|
||||
void *p;
|
||||
unsigned int i;
|
||||
va_list ap2;
|
||||
va_copy(ap2, ap);
|
||||
for (i=n; i>1; i--) va_arg(ap2, void *);
|
||||
p = va_arg(ap2, void *);
|
||||
va_end(ap2);
|
||||
return p;
|
||||
}
|
||||
|
||||
static void store_int(void *dest, int size, unsigned long long i)
|
||||
{
|
||||
if (!dest) return;
|
||||
switch (size) {
|
||||
case SIZE_hh:
|
||||
*(char *)dest = i;
|
||||
break;
|
||||
case SIZE_h:
|
||||
*(short *)dest = i;
|
||||
break;
|
||||
case SIZE_def:
|
||||
*(int *)dest = i;
|
||||
break;
|
||||
case SIZE_l:
|
||||
*(long *)dest = i;
|
||||
break;
|
||||
case SIZE_ll:
|
||||
*(long long *)dest = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static int ff_vfscanf(FFFILE *f, const char *fmt, va_list ap)
|
||||
{
|
||||
int width;
|
||||
int size;
|
||||
int base;
|
||||
const unsigned char *p;
|
||||
int c, t;
|
||||
char *s;
|
||||
void *dest=NULL;
|
||||
int invert;
|
||||
int matches=0;
|
||||
unsigned long long x;
|
||||
double y;
|
||||
off_t pos = 0;
|
||||
unsigned char scanset[257];
|
||||
size_t i;
|
||||
|
||||
for (p=(const unsigned char *)fmt; *p; p++) {
|
||||
|
||||
if (av_isspace(*p)) {
|
||||
while (av_isspace(p[1])) p++;
|
||||
shlim(f, 0);
|
||||
while (av_isspace(shgetc(f)));
|
||||
shunget(f);
|
||||
pos += shcnt(f);
|
||||
continue;
|
||||
}
|
||||
if (*p != '%' || p[1] == '%') {
|
||||
shlim(f, 0);
|
||||
if (*p == '%') {
|
||||
p++;
|
||||
while (av_isspace((c=shgetc(f))));
|
||||
} else {
|
||||
c = shgetc(f);
|
||||
}
|
||||
if (c!=*p) {
|
||||
shunget(f);
|
||||
if (c<0) goto input_fail;
|
||||
goto match_fail;
|
||||
}
|
||||
pos += shcnt(f);
|
||||
continue;
|
||||
}
|
||||
|
||||
p++;
|
||||
if (*p=='*') {
|
||||
dest = 0; p++;
|
||||
} else if (av_isdigit(*p) && p[1]=='$') {
|
||||
dest = arg_n(ap, *p-'0'); p+=2;
|
||||
} else {
|
||||
dest = va_arg(ap, void *);
|
||||
}
|
||||
|
||||
for (width=0; av_isdigit(*p); p++) {
|
||||
width = 10*width + *p - '0';
|
||||
}
|
||||
|
||||
if (*p=='m') {
|
||||
s = 0;
|
||||
p++;
|
||||
}
|
||||
|
||||
size = SIZE_def;
|
||||
switch (*p++) {
|
||||
case 'h':
|
||||
if (*p == 'h') p++, size = SIZE_hh;
|
||||
else size = SIZE_h;
|
||||
break;
|
||||
case 'l':
|
||||
if (*p == 'l') p++, size = SIZE_ll;
|
||||
else size = SIZE_l;
|
||||
break;
|
||||
case 'j':
|
||||
size = SIZE_ll;
|
||||
break;
|
||||
case 'z':
|
||||
case 't':
|
||||
size = SIZE_l;
|
||||
break;
|
||||
case 'L':
|
||||
size = SIZE_L;
|
||||
break;
|
||||
case 'd': case 'i': case 'o': case 'u': case 'x':
|
||||
case 'a': case 'e': case 'f': case 'g':
|
||||
case 'A': case 'E': case 'F': case 'G': case 'X':
|
||||
case 's': case 'c': case '[':
|
||||
case 'S': case 'C':
|
||||
case 'p': case 'n':
|
||||
p--;
|
||||
break;
|
||||
default:
|
||||
goto fmt_fail;
|
||||
}
|
||||
|
||||
t = *p;
|
||||
|
||||
/* C or S */
|
||||
if ((t&0x2f) == 3) {
|
||||
t |= 32;
|
||||
size = SIZE_l;
|
||||
}
|
||||
|
||||
switch (t) {
|
||||
case 'c':
|
||||
if (width < 1) width = 1;
|
||||
case '[':
|
||||
break;
|
||||
case 'n':
|
||||
store_int(dest, size, pos);
|
||||
/* do not increment match count, etc! */
|
||||
continue;
|
||||
default:
|
||||
shlim(f, 0);
|
||||
while (av_isspace(shgetc(f)));
|
||||
shunget(f);
|
||||
pos += shcnt(f);
|
||||
}
|
||||
|
||||
shlim(f, width);
|
||||
if (shgetc(f) < 0) goto input_fail;
|
||||
shunget(f);
|
||||
|
||||
switch (t) {
|
||||
case 's':
|
||||
case 'c':
|
||||
case '[':
|
||||
if (t == 'c' || t == 's') {
|
||||
memset(scanset, -1, sizeof scanset);
|
||||
scanset[0] = 0;
|
||||
if (t == 's') {
|
||||
scanset[1 + '\t'] = 0;
|
||||
scanset[1 + '\n'] = 0;
|
||||
scanset[1 + '\v'] = 0;
|
||||
scanset[1 + '\f'] = 0;
|
||||
scanset[1 + '\r'] = 0;
|
||||
scanset[1 + ' ' ] = 0;
|
||||
}
|
||||
} else {
|
||||
if (*++p == '^') p++, invert = 1;
|
||||
else invert = 0;
|
||||
memset(scanset, invert, sizeof scanset);
|
||||
scanset[0] = 0;
|
||||
if (*p == '-') p++, scanset[1+'-'] = 1-invert;
|
||||
else if (*p == ']') p++, scanset[1+']'] = 1-invert;
|
||||
for (; *p != ']'; p++) {
|
||||
if (!*p) goto fmt_fail;
|
||||
if (*p=='-' && p[1] && p[1] != ']')
|
||||
for (c=p++[-1]; c<*p; c++)
|
||||
scanset[1+c] = 1-invert;
|
||||
scanset[1+*p] = 1-invert;
|
||||
}
|
||||
}
|
||||
s = 0;
|
||||
i = 0;
|
||||
if ((s = dest)) {
|
||||
while (scanset[(c=shgetc(f))+1])
|
||||
s[i++] = c;
|
||||
} else {
|
||||
while (scanset[(c=shgetc(f))+1]);
|
||||
}
|
||||
shunget(f);
|
||||
if (!shcnt(f)) goto match_fail;
|
||||
if (t == 'c' && shcnt(f) != width) goto match_fail;
|
||||
if (t != 'c') {
|
||||
if (s) s[i] = 0;
|
||||
}
|
||||
break;
|
||||
case 'p':
|
||||
case 'X':
|
||||
case 'x':
|
||||
base = 16;
|
||||
goto int_common;
|
||||
case 'o':
|
||||
base = 8;
|
||||
goto int_common;
|
||||
case 'd':
|
||||
case 'u':
|
||||
base = 10;
|
||||
goto int_common;
|
||||
case 'i':
|
||||
base = 0;
|
||||
int_common:
|
||||
x = ffintscan(f, base, 0, ULLONG_MAX);
|
||||
if (!shcnt(f))
|
||||
goto match_fail;
|
||||
if (t=='p' && dest)
|
||||
*(void **)dest = (void *)(uintptr_t)x;
|
||||
else
|
||||
store_int(dest, size, x);
|
||||
break;
|
||||
case 'a': case 'A':
|
||||
case 'e': case 'E':
|
||||
case 'f': case 'F':
|
||||
case 'g': case 'G':
|
||||
y = fffloatscan(f, size, 0);
|
||||
if (!shcnt(f))
|
||||
goto match_fail;
|
||||
if (dest) {
|
||||
switch (size) {
|
||||
case SIZE_def:
|
||||
*(float *)dest = y;
|
||||
break;
|
||||
case SIZE_l:
|
||||
*(double *)dest = y;
|
||||
break;
|
||||
case SIZE_L:
|
||||
*(double *)dest = y;
|
||||
break;
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
pos += shcnt(f);
|
||||
if (dest) matches++;
|
||||
}
|
||||
if (0) {
|
||||
fmt_fail:
|
||||
input_fail:
|
||||
if (!matches) matches--;
|
||||
}
|
||||
match_fail:
|
||||
return matches;
|
||||
}
|
||||
|
||||
static int ff_vsscanf(const char *s, const char *fmt, va_list ap)
|
||||
{
|
||||
FFFILE f = {
|
||||
.buf = (void *)s, .cookie = (void *)s,
|
||||
.read = ffstring_read,
|
||||
};
|
||||
|
||||
return ff_vfscanf(&f, fmt, ap);
|
||||
}
|
||||
|
||||
int av_sscanf(const char *string, const char *format, ...)
|
||||
{
|
||||
int ret;
|
||||
va_list ap;
|
||||
va_start(ap, format);
|
||||
ret = ff_vsscanf(string, format, ap);
|
||||
va_end(ap);
|
||||
return ret;
|
||||
}
|
||||
@ -400,6 +400,12 @@ int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
|
||||
*/
|
||||
int av_match_list(const char *name, const char *list, char separator);
|
||||
|
||||
/**
|
||||
* See libc sscanf manual for more information.
|
||||
* Locale-independent sscanf implementation.
|
||||
*/
|
||||
int av_sscanf(const char *string, const char *format, ...);
|
||||
|
||||
/**
|
||||
* @}
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user