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Add backslash '\' support to the parser

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Commited in SoC by Vitor Sessak on 2008-03-29 16:26:47

Originally committed as revision 12744 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-04-04 20:09:20 +00:00
parent 398f12970f
commit 4f409baa06
1 changed files with 29 additions and 16 deletions
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45
libavfilter/avfiltergraph.c
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@ -232,19 +232,25 @@ static char consume_char(const char **buf)
}
/**
* remove the quotation marks from a string. Ex: "aaa'bb'cc" -> "aaabbcc"
* Copy the first size bytes of input string to a null-terminated string,
* removing any control character. Ex: "aaa'bb'c\'c\\" -> "aaabbc'c\"
*/
static void unquote(char *str)
static void copy_unquoted(char *out, const char *in, int size)
{
char *p1, *p2;
p1=p2=str;
while (*p1 != 0) {
if (*p1 != '\'')
*p2++ = *p1;
p1++;
int i;
for (i=0; i < size; i++) {
if (in[i] == '\'')
continue;
else if (in[i] == '\\') {
if (i+1 == size) {
*out = 0;
return;
}
i++;
}
*out++ = in[i];
}
*p2 = 0;
*out=0;
}
/**
@ -264,10 +270,20 @@ static char *consume_string(const char **buf)
start = *buf;
*buf += strcspn(*buf, " ()=,'");
while(1) {
*buf += strcspn(*buf, " ()=,'\\");
if (**buf == '\\')
*buf+=2;
else
break;
}
if (**buf == '\'') {
char *p = strchr(*buf + 1, '\'');
const char *p = *buf;
do {
p++;
p = strchr(p, '\'');
} while (p && p[-1] == '\\');
if (p)
*buf = p + 1;
else
@ -276,10 +292,7 @@ static char *consume_string(const char **buf)
size = *buf - start + 1;
ret = av_malloc(size);
memcpy(ret, start, size - 1);
ret[size-1] = 0;
unquote(ret);
copy_unquoted(ret, start, size-1);
return ret;
}