blob: a4cbb7d2cf17b3cc9a76149abfb5658963b8e9fe [file] [log] [blame]
/*
* Chunk management functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <common/config.h>
#include <common/chunk.h>
/*
* Does an snprintf() at the end of chunk <chk>, respecting the limit of
* at most chk->size chars. If the chk->len is over, nothing is added. Returns
* the new chunk size.
*/
int chunk_printf(struct chunk *chk, const char *fmt, ...)
{
va_list argp;
int ret;
if (!chk->str || !chk->size)
return 0;
va_start(argp, fmt);
ret = vsnprintf(chk->str + chk->len, chk->size - chk->len, fmt, argp);
if (ret >= chk->size - chk->len)
/* do not copy anything in case of truncation */
chk->str[chk->len] = 0;
else
chk->len += ret;
va_end(argp);
return chk->len;
}
/*
* Encode chunk <src> into chunk <dst>, respecting the limit of at most
* chk->size chars. Replace non-printable or special chracters with "&#%d;".
* If the chk->len is over, nothing is added. Returns the new chunk size.
*/
int chunk_htmlencode(struct chunk *dst, struct chunk *src)
{
int i, l;
int olen, free;
char c;
olen = dst->len;
for (i = 0; i < src->len; i++) {
free = dst->size - dst->len;
if (!free) {
dst->len = olen;
return dst->len;
}
c = src->str[i];
if (!isascii(c) || !isprint((unsigned char)c) || c == '&' || c == '"' || c == '\'' || c == '<' || c == '>') {
l = snprintf(dst->str + dst->len, free, "&#%u;", (unsigned char)c);
if (free < l) {
dst->len = olen;
return dst->len;
}
dst->len += l;
} else {
dst->str[dst->len] = c;
dst->len++;
}
}
return dst->len;
}
/*
* Encode chunk <src> into chunk <dst>, respecting the limit of at most
* chk->size chars. Replace non-printable or char passed in qc with "<%02X>".
* If the chk->len is over, nothing is added. Returns the new chunk size.
*/
int chunk_asciiencode(struct chunk *dst, struct chunk *src, char qc)
{
int i, l;
int olen, free;
char c;
olen = dst->len;
for (i = 0; i < src->len; i++) {
free = dst->size - dst->len;
if (!free) {
dst->len = olen;
return dst->len;
}
c = src->str[i];
if (!isascii(c) || !isprint((unsigned char)c) || c == '<' || c == '>' || c == qc) {
l = snprintf(dst->str + dst->len, free, "<%02X>", (unsigned char)c);
if (free < l) {
dst->len = olen;
return dst->len;
}
dst->len += l;
} else {
dst->str[dst->len] = c;
dst->len++;
}
}
return dst->len;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/