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MINOR: standard: add function "escape_chunk"

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This function tries to prefix all characters tagged in the <map> with the
<escape> character. The specified <chunk> contains the input to be
escaped.
This commit is contained in:
Dragan Dosen 2016-02-12 13:23:02 +01:00 committed by Willy Tarreau
parent 1de1659923
commit 0edd10925d
2 changed files with 43 additions and 0 deletions
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11
include/common/standard.h
View File

@ -380,6 +380,17 @@ char *encode_chunk(char *start, char *stop,
const char escape, const fd_set *map,
const struct chunk *chunk);
/*
* Tries to prefix characters tagged in the <map> with the <escape>
* character. <chunk> contains the input to be escaped. The result will be
* stored between <start> (included) and <stop> (excluded). The function
* will always try to terminate the resulting string with a '\0' before
* <stop>, and will return its position if the conversion completes.
*/
char *escape_chunk(char *start, char *stop,
const char escape, const fd_set *map,
const struct chunk *chunk);
/* Check a string for using it in a CSV output format. If the string contains
* one of the following four char <">, <,>, CR or LF, the string is

32
src/standard.c
View File

@ -1439,6 +1439,38 @@ char *encode_chunk(char *start, char *stop,
return start;
}
/*
* Tries to prefix characters tagged in the <map> with the <escape>
* character. <chunk> contains the input to be escaped. The result will be
* stored between <start> (included) and <stop> (excluded). The function
* will always try to terminate the resulting string with a '\0' before
* <stop>, and will return its position if the conversion completes.
*/
char *escape_chunk(char *start, char *stop,
const char escape, const fd_set *map,
const struct chunk *chunk)
{
char *str = chunk->str;
char *end = chunk->str + chunk->len;
if (start < stop) {
stop--; /* reserve one byte for the final '\0' */
while (start < stop && str < end) {
if (!FD_ISSET((unsigned char)(*str), map))
*start++ = *str;
else {
if (start + 2 >= stop)
break;
*start++ = escape;
*start++ = *str;
}
str++;
}
*start = '\0';
}
return start;
}
/* Check a string for using it in a CSV output format. If the string contains
* one of the following four char <">, <,>, CR or LF, the string is
* encapsulated between <"> and the <"> are escaped by a <""> sequence.