/*
* $LynxId: HTParse.h,v 1.22 2016/11/23 21:06:50 tom Exp $
* HTParse: URL parsing in the WWW Library
* HTPARSE
*
* This module of the WWW library contains code to parse URLs and various
* related things.
* Implemented by HTParse.c .
*/
#ifndef HTPARSE_H
#define HTPARSE_H
#ifndef HTUTILS_H
#include <HTUtils.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define RFC_3986_UNRESERVED(c) (isalnum(UCH(c)) || strchr("-._~", UCH(c)) != 0)
#define RFC_3986_GEN_DELIMS(c) ((c) != 0 && strchr(":/?#[]@", UCH(c)) != 0)
#define RFC_3986_SUB_DELIMS(c) ((c) != 0 && strchr("!$&'()*+,;=", UCH(c)) != 0)
/*
* The following are flag bits which may be ORed together to form
* a number to give the 'wanted' argument to HTParse.
*/
#define PARSE_ACCESS 16
#define PARSE_HOST 8
#define PARSE_PATH 4
#define PARSE_ANCHOR 2
#define PARSE_PUNCTUATION 1
#define PARSE_ALL 31
#define PARSE_ALL_WITHOUT_ANCHOR (PARSE_ALL ^ PARSE_ANCHOR)
/*
* Additional flag bits for more details on components already
* covered by the above. The PARSE_PATH above doesn't really
* strictly refer to the path component in the sense of the URI
* specs only, but rather to that combined with a possible query
* component. - kw
*/
#define PARSE_STRICTPATH 32
#define PARSE_QUERY 64
/*
* The following are valid mask values. The terms are the BNF names
* in the URL document.
*/
#define URL_XALPHAS UCH(1)
#define URL_XPALPHAS UCH(2)
#define URL_PATH UCH(4)
/* Strip white space off a string. HTStrip()
* -------------------------------
*
* On exit,
* Return value points to first non-white character, or to 0 if none.
* All trailing white space is OVERWRITTEN with zero.
*/ extern char *HTStrip(char *s);
/*
* Parse a port number
* -------------------
*
* On entry,
* host A pointer to hostname possibly followed by port
*
* On exit,
* returns A pointer to the ":" before the port
* sets the port number via the pointer portp.
*/
extern char *HTParsePort(char *host, int *portp);
/* Parse a Name relative to another name. HTParse()
* --------------------------------------
*
* This returns those parts of a name which are given (and requested)
* substituting bits from the related name where necessary.
*
* On entry,
* aName A filename given
* relatedName A name relative to which aName is to be parsed
* wanted A mask for the bits which are wanted.
*
* On exit,
* returns A pointer to a malloc'd string which MUST BE FREED
*/
extern char *HTParse(const char *aName,
const char *relatedName,
int wanted);
/* HTParseAnchor(), fast HTParse() specialization
* ----------------------------------------------
*
* On exit,
* returns A pointer within input string (probably to its end '\0')
*/
extern const char *HTParseAnchor(const char *aName);
/* Simplify a filename. HTSimplify()
* --------------------
*
* A unix-style file is allowed to contain the seqeunce xxx/../ which may
* be replaced by "" , and the seqeunce "/./" which may be replaced by "/".
* Simplification helps us recognize duplicate filenames.
*
* Thus, /etc/junk/../fred becomes /etc/fred
* /etc/junk/./fred becomes /etc/junk/fred
*
* but we should NOT change
* http://fred.xxx.edu/../..
*
* or ../../albert.html
*/
extern void HTSimplify(char *filename);
/* Make Relative Name. HTRelative()
* -------------------
*
* This function creates and returns a string which gives an expression of
* one address as related to another. Where there is no relation, an absolute
* address is retured.
*
* On entry,
* Both names must be absolute, fully qualified names of nodes
* (no anchor bits)
*
* On exit,
* The return result points to a newly allocated name which, if
* parsed by HTParse relative to relatedName, will yield aName.
* The caller is responsible for freeing the resulting name later.
*
*/
extern char *HTRelative(const char *aName,
const char *relatedName);
/* Escape undesirable characters using % HTEscape()
* -------------------------------------
*
* This function takes a pointer to a string in which
* some characters may be unacceptable are unescaped.
* It returns a string which has these characters
* represented by a '%' character followed by two hex digits.
*
* Unlike HTUnEscape(), this routine returns a malloc'd string.
*/
extern char *HTEscape(const char *str,
unsigned mask);
/* Escape unsafe characters using % HTEscapeUnsafe()
* --------------------------------
*
* This function takes a pointer to a string in which
* some characters may be that may be unsafe are unescaped.
* It returns a string which has these characters
* represented by a '%' character followed by two hex digits.
*
* Unlike HTUnEscape(), this routine returns a malloc'd string.
*/
extern char *HTEscapeUnsafe(const char *str);
/* Escape undesirable characters using % but space to +. HTEscapeSP()
* -----------------------------------------------------
*
* This function takes a pointer to a string in which
* some characters may be unacceptable are unescaped.
* It returns a string which has these characters
* represented by a '%' character followed by two hex digits,
* except that spaces are converted to '+' instead of %2B.
*
* Unlike HTUnEscape(), this routine returns a malloc'd string.
*/
extern char *HTEscapeSP(const char *str,
unsigned mask);
/* Decode %xx escaped characters. HTUnEscape()
* ------------------------------
*
* This function takes a pointer to a string in which some
* characters may have been encoded in %xy form, where xy is
* the acsii hex code for character 16x+y.
* The string is converted in place, as it will never grow.
*/
extern char *HTUnEscape(char *str);
/* Decode some %xx escaped characters. HTUnEscapeSome()
* ----------------------------------- Klaus Weide
* (kweide@tezcat.com)
* This function takes a pointer to a string in which some
* characters may have been encoded in %xy form, where xy is
* the acsii hex code for character 16x+y, and a pointer to
* a second string containing one or more characters which
* should be unescaped if escaped in the first string.
* The first string is converted in place, as it will never grow.
*/
extern char *HTUnEscapeSome(char *str,
const char *do_trans);
/*
* Turn a string which is not a RFC 822 token into a quoted-string. - KW
*/
extern void HTMake822Word(char **str,
int quoted);
#ifdef __cplusplus
}
#endif
#endif /* HTPARSE_H */