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