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/*
* Copyright (c) 2022 Omar Polo <op@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "got_compat.h"
#include "tmpl.h"
int
tp_write(struct template *tp, const char *str, size_t len)
{
size_t avail;
while (len > 0) {
avail = tp->tp_cap - tp->tp_len;
if (avail == 0) {
if (template_flush(tp) == -1)
return (-1);
avail = tp->tp_cap;
}
if (len < avail)
avail = len;
memcpy(tp->tp_buf + tp->tp_len, str, avail);
tp->tp_len += avail;
str += avail;
len -= avail;
}
return (0);
}
int
tp_writes(struct template *tp, const char *str)
{
return (tp_write(tp, str, strlen(str)));
}
int
tp_writef(struct template *tp, const char *fmt, ...)
{
va_list ap;
char *str;
int r;
va_start(ap, fmt);
r = vasprintf(&str, fmt, ap);
va_end(ap);
if (r == -1)
return (-1);
r = tp_write(tp, str, r);
free(str);
return (r);
}
int
tp_urlescape(struct template *tp, const char *str)
{
int r;
char tmp[4];
if (str == NULL)
return (0);
for (; *str; ++str) {
if (iscntrl((unsigned char)*str) ||
isspace((unsigned char)*str) ||
*str == '\'' || *str == '"' || *str == '\\') {
r = snprintf(tmp, sizeof(tmp), "%%%2X", *str);
if (r < 0 || (size_t)r >= sizeof(tmp))
return (0);
if (tp_write(tp, tmp, r) == -1)
return (-1);
} else {
if (tp_write(tp, str, 1) == -1)
return (-1);
}
}
return (0);
}
static inline int
htmlescape(struct template *tp, char c)
{
switch (c) {
case '<':
return tp_write(tp, "<", 4);
case '>':
return tp_write(tp, ">", 4);
case '&':
return tp_write(tp, "&", 5);
case '"':
return tp_write(tp, """, 6);
case '\'':
return tp_write(tp, "'", 6);
default:
return tp_write(tp, &c, 1);
}
}
int
tp_htmlescape(struct template *tp, const char *str)
{
if (str == NULL)
return (0);
for (; *str; ++str) {
if (htmlescape(tp, *str) == -1)
return (-1);
}
return (0);
}
int
tp_write_htmlescape(struct template *tp, const char *str, size_t len)
{
size_t i;
for (i = 0; i < len; ++i) {
if (htmlescape(tp, str[i]) == -1)
return (-1);
}
return (0);
}
struct template *
template(void *arg, tmpl_write writefn, char *buf, size_t siz)
{
struct template *tp;
if ((tp = calloc(1, sizeof(*tp))) == NULL)
return (NULL);
tp->tp_arg = arg;
tp->tp_write = writefn;
tp->tp_buf = buf;
tp->tp_cap = siz;
return (tp);
}
int
template_flush(struct template *tp)
{
if (tp->tp_len == 0)
return (0);
if (tp->tp_write(tp->tp_arg, tp->tp_buf, tp->tp_len) == -1)
return (-1);
tp->tp_len = 0;
return (0);
}
void
template_free(struct template *tp)
{
free(tp->tp_tmp);
free(tp);
}
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