/* Copyright (c) 2003-2010 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "str.h"
#include "strescape.h"

const char *str_escape(const char *str)
{
	const char *p;
	string_t *ret;

	/* see if we need to quote it */
	for (p = str; *p != '\0'; p++) {
		if (IS_ESCAPED_CHAR(*p))
			break;
	}

	if (*p == '\0')
		return str;

	/* quote */
	ret = t_str_new((size_t) (p - str) + 128);
	str_append_n(ret, str, (size_t) (p - str));

	for (; *p != '\0'; p++) {
		if (IS_ESCAPED_CHAR(*p))
			str_append_c(ret, '\\');
		str_append_c(ret, *p);
	}
	return str_c(ret);
}

void str_append_unescaped(string_t *dest, const void *src, size_t src_size)
{
	const unsigned char *src_c = src;
	size_t start = 0, i = 0;

	while (i < src_size) {
		start = i;
		for (; i < src_size; i++) {
			if (src_c[i] == '\\')
				break;
		}

		str_append_n(dest, src_c + start, i-start);

		if (i < src_size) {
			if (++i == src_size)
				break;
			str_append_c(dest, src_c[i++]);
		}
		start = i;
	}
}

char *str_unescape(char *str)
{
	/* @UNSAFE */
	char *dest, *start = str;

	while (*str != '\\') {
		if (*str == '\0')
			return start;
		str++;
	}

	for (dest = str; *str != '\0'; str++) {
		if (*str == '\\' && str[1] != '\0')
			str++;

		*dest++ = *str;
	}

	*dest = '\0';
	return start;
}