shttpd_uri.c

#include "shttpd.h"



static void
remove_double_dots(char *s)
{
	char	*p = s;

	while (*s != '\0') 
	{
		*p++ = *s++;
		if (s[-1] == '/' || s[-1] == '\\')
		{
			while (*s == '.' || *s == '/' || *s == '\\')
			{
				s++;
			}
		}
	}
	*p = '\0';
}


static int uri_decode(char *src, int src_len, char *dst, int dst_len)
{
	int	i, j, a, b;
#define	HEXTOI(x)  (isdigit(x) ? x - '0' : x - 'W')

	for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++)
	{
		switch (src[i]) 
		{
		case '%':
			if (isxdigit(((unsigned char *) src)[i + 1]) &&
			    isxdigit(((unsigned char *) src)[i + 2])) 
			{
				a = tolower(((unsigned char *)src)[i + 1]);
				b = tolower(((unsigned char *)src)[i + 2]);
				dst[j] = (HEXTOI(a) << 4) | HEXTOI(b);
				i += 2;
			} 
			else 
			{
				dst[j] = '%';
			}
			break;
		default:
			dst[j] = src[i];
			break;
		}
	}

	dst[j] = '\0';	/* Null-terminate the destination */

	return (j);
}

void uri_parse(char *src, int len)
{
	uri_decode(src, len -1, src, len);
	remove_double_dots(src);
}