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static char const rcsid[] =
"@(#) $Id: htmlurl.c,v 1.27 2005/03/23 01:36:54 danielk1977 Exp $";
/*
** Routines for processing URLs.
**
** This source code is released into the public domain by the author,
** D. Richard Hipp, on 2002 December 17. Instead of a license, here
** is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
*/
#include <tk.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "html.h"
/*
** A parsed URI is held in an instance of the following structure.
** Each component is recorded in memory obtained from HtmlAlloc().
**
** The examples are from the URI
**
** http://192.168.1.1:8080/cgi-bin/printenv?name=xyzzy&addr=none#frag
*/
struct HtmlUri {
char *zScheme; /* Ex: "http" */
char *zAuthority; /* Ex: "192.168.1.1:8080" */
char *zPath; /* Ex: "cgi-bin/printenv" */
char *zQuery; /* Ex: "name=xyzzy&addr=none" */
char *zFragment; /* Ex: "frag" */
};
typedef struct HtmlUri HtmlUri;
/*
** Return the length of the next component of the URL in z[] given
** that the component starts at z[0]. The initial sequence of the
** component must be zInit[]. The component is terminated by any
** character in zTerm[]. The length returned is 0 if the component
** doesn't exist. The length includes the zInit[] string, but not
** the termination character.
**
** Component zInit zTerm
** ---------- ------- -------
** scheme "" ":/?#"
** authority "//" "/?#"
** path "/" "?#"
** query "?" "#"
** fragment "#" ""
*/
static int
ComponentLength(z, zInit, zTerm)
const char *z;
const char *zInit;
const char *zTerm;
{
int i, n;
for (n = 0; zInit[n]; n++) {
if (zInit[n] != z[n])
return 0;
}
while (z[n]) {
for (i = 0; zTerm[i]; i++) {
if (z[n] == zTerm[i])
return n;
}
n++;
}
return n;
}
/*
** Duplicate a string of length n.
*/
static char *
StrNDup(z, n)
const char *z;
int n;
{
char *zResult;
if (n <= 0) {
n = strlen(z);
}
zResult = HtmlAlloc(n + 1);
if (zResult) {
memcpy(zResult, z, n);
zResult[n] = 0;
}
return zResult;
}
/*
** Parse a text URI into an HtmlUri structure.
*/
static HtmlUri *
ParseUri(zUri)
const char *zUri;
{
HtmlUri *p;
int n;
p = HtmlAlloc(sizeof(*p));
if (p == 0)
return 0;
memset(p, 0, sizeof(*p));
if (zUri == 0 || zUri[0] == 0)
return p;
while (isspace(zUri[0])) {
zUri++;
}
n = ComponentLength(zUri, "", ":/?# ");
if (n > 0 && zUri[n] == ':') {
p->zScheme = StrNDup(zUri, n);
zUri += n + 1;
}
n = ComponentLength(zUri, "//", "/?# ");
if (n > 0) {
p->zAuthority = StrNDup(&zUri[2], n - 2);
zUri += n;
}
n = ComponentLength(zUri, "", "?#");
if (n > 0) {
p->zPath = StrNDup(zUri, n);
zUri += n;
}
n = ComponentLength(zUri, "?", "# ");
if (n > 0) {
p->zQuery = StrNDup(&zUri[1], n - 1);
zUri += n;
}
n = ComponentLength(zUri, "#", " ");
if (n > 0) {
p->zFragment = StrNDup(&zUri[1], n - 1);
}
return p;
}
/*
** Delete an HtmlUri structure.
*/
static void
FreeUri(p)
HtmlUri *p;
{
if (p == 0)
return;
if (p->zScheme)
HtmlFree(p->zScheme);
if (p->zAuthority)
HtmlFree(p->zAuthority);
if (p->zPath)
HtmlFree(p->zPath);
if (p->zQuery)
HtmlFree(p->zQuery);
if (p->zFragment)
HtmlFree(p->zFragment);
HtmlFree(p);
}
/*
** Create a string to hold the given URI. Memory to hold the string
** is obtained from HtmlAlloc() and must be freed by the calling
** function.
*/
static char *
BuildUri(p)
HtmlUri *p;
{
int n = 1;
char *z;
if (p->zScheme)
n += strlen(p->zScheme) + 1;
if (p->zAuthority)
n += strlen(p->zAuthority) + 2;
if (p->zPath)
n += strlen(p->zPath) + 1;
if (p->zQuery)
n += strlen(p->zQuery) + 1;
if (p->zFragment)
n += strlen(p->zFragment) + 1;
z = HtmlAlloc(n);
if (z == 0)
return 0;
n = 0;
if (p->zScheme) {
sprintf(z, "%s:", p->zScheme);
n = strlen(z);
}
if (p->zAuthority) {
sprintf(&z[n], "//%s", p->zAuthority);
n += strlen(&z[n]);
}
if (p->zPath) {
sprintf(&z[n], "%s", p->zPath);
n += strlen(&z[n]);
}
if (p->zQuery) {
sprintf(&z[n], "?%s", p->zQuery);
n += strlen(&z[n]);
}
if (p->zFragment) {
sprintf(&z[n], "#%s", p->zFragment);
}
else {
z[n] = 0;
}
return z;
}
/*
** Replace the string in *pzDest with the string in zSrc
*/
static void
ReplaceStr(pzDest, zSrc)
char **pzDest;
const char *zSrc;
{
if (*pzDest != 0)
HtmlFree(*pzDest);
if (zSrc == 0) {
*pzDest = 0;
}
else {
*pzDest = StrNDup(zSrc, -1);
}
}
/*
** Remove leading and trailing spaces from the given string. Return
** a new string obtained from HtmlAlloc().
*/
static char *
Trim(z)
char *z;
{
int i;
char *zNew;
while (isspace(*z))
z++;
i = strlen(z);
zNew = HtmlAlloc(i + 1);
if (zNew == 0)
return 0;
strcpy(zNew, z);
if (i > 0 && isspace(zNew[i - 1])) {
i--;
zNew[i] = 0;
}
return zNew;
}
/*
** The input azSeries[] is a sequence of URIs. This command must
** resolve them all and put the result in the interp->result field
** of the interpreter associated with the HTML widget. Return
** TCL_OK on success and TCL_ERROR if there is a failure.
**
** This function can cause the HTML widget to be deleted or changed
** arbitrarily.
*/
int
HtmlCallResolver(htmlPtr, azSeries)
HtmlWidget *htmlPtr; /* The widget that is doing the
* resolving. */
char **azSeries; /* A list of URIs. NULL terminated */
{
int rc = TCL_OK; /* Return value of this function. */
char *z = 0;
HtmlVerifyLock(htmlPtr);
if (htmlPtr->zResolverCommand && htmlPtr->zResolverCommand[0]) {
/*
** Append the current base URI then the azSeries arguments to the
** TCL command specified by the -resolvercommand optoin, then execute
** the result.
**
** The -resolvercommand could do nasty things, such as delete
** the HTML widget out from under us. Be prepared for the worst.
*/
Tcl_DString cmd;
Tcl_DStringInit(&cmd);
Tcl_DStringAppend(&cmd, htmlPtr->zResolverCommand, -1);
if (htmlPtr->zBaseHref && htmlPtr->zBaseHref[0]) {
z = Trim(htmlPtr->zBaseHref);
}
else if (htmlPtr->zBase && htmlPtr->zBase[0]) {
z = Trim(htmlPtr->zBase);
}
if (z) {
Tcl_DStringAppendElement(&cmd, z);
HtmlFree(z);
}
while (azSeries[0]) {
z = Trim(azSeries[0]);
if (z) {
Tcl_DStringAppendElement(&cmd, z);
HtmlFree(z);
}
azSeries++;
}
HtmlLock(htmlPtr);
htmlPtr->inParse++;
rc = Tcl_GlobalEval(htmlPtr->interp, Tcl_DStringValue(&cmd));
htmlPtr->inParse--;
Tcl_DStringFree(&cmd);
if (HtmlUnlock(htmlPtr))
return TCL_ERROR;
if (rc != TCL_OK) {
Tcl_AddErrorInfo(htmlPtr->interp,
"\n (-resolvercommand executed by HTML widget)");
Tcl_BackgroundError(htmlPtr->interp);
}
}
else {
/*
** No -resolvercommand has been specified. Do the default
** resolver algorithm specified in section 5.2 of RFC 2396.
*/
HtmlUri *base, *term;
if (htmlPtr->zBaseHref && htmlPtr->zBaseHref[0]) {
base = ParseUri(htmlPtr->zBaseHref);
}
else {
base = ParseUri(htmlPtr->zBase);
}
while (azSeries[0]) {
term = ParseUri(azSeries[0]);
azSeries++;
if (term->zScheme == 0 && term->zAuthority == 0 && term->zPath == 0
&& term->zQuery == 0 && term->zFragment) {
ReplaceStr(&base->zFragment, term->zFragment);
}
else if (term->zScheme) {
HtmlUri temp;
temp = *term;
*term = *base;
*base = temp;
}
else if (term->zAuthority) {
ReplaceStr(&base->zAuthority, term->zAuthority);
ReplaceStr(&base->zPath, term->zPath);
ReplaceStr(&base->zQuery, term->zQuery);
ReplaceStr(&base->zFragment, term->zFragment);
}
else if (term->zPath && (term->zPath[0] == '/' || base->zPath == 0)) {
ReplaceStr(&base->zPath, term->zPath);
ReplaceStr(&base->zQuery, term->zQuery);
ReplaceStr(&base->zFragment, term->zFragment);
}
else if (term->zPath && base->zPath) {
char *zBuf;
int i, j;
zBuf = HtmlAlloc(strlen(base->zPath) + strlen(term->zPath) + 2);
if (zBuf) {
sprintf(zBuf, "%s", base->zPath);
for (i = strlen(zBuf) - 1; i >= 0 && zBuf[i] != '/'; i--) {
zBuf[i] = 0;
}
strcat(zBuf, term->zPath);
for (i = 0; zBuf[i]; i++) {
if (zBuf[i] == '/' && zBuf[i + 1] == '.'
&& zBuf[i + 2] == '/') {
strcpy(&zBuf[i + 1], &zBuf[i + 3]);
i--;
continue;
}
if (zBuf[i] == '/' && zBuf[i + 1] == '.'
&& zBuf[i + 2] == 0) {
zBuf[i + 1] = 0;
continue;
}
if (i > 0 && zBuf[i] == '/' && zBuf[i + 1] == '.'
&& zBuf[i + 2] == '.' && (zBuf[i + 3] == '/'
|| zBuf[i + 3] == 0)) {
for (j = i - 1; j >= 0 && zBuf[j] != '/'; j--) {
}
if (zBuf[i + 3]) {
strcpy(&zBuf[j + 1], &zBuf[i + 4]);
}
else {
zBuf[j + 1] = 0;
}
i = j - 1;
if (i < -1)
i = -1;
continue;
}
}
/* look for /../ at begining */
if (!strncmp(zBuf,"/../",4))
strcpy(zBuf,zBuf+3);
HtmlFree(base->zPath);
base->zPath = zBuf;
}
ReplaceStr(&base->zQuery, term->zQuery);
ReplaceStr(&base->zFragment, term->zFragment);
}
else if (term->zQuery) {
ReplaceStr(&base->zQuery, term->zQuery);
}
FreeUri(term);
}
Tcl_SetResult(htmlPtr->interp, BuildUri(base), TCL_DYNAMIC);
FreeUri(base);
}
return rc;
}
/*
** This is a convenient wrapper routine for HtmlCallResolver.
** It makes a copy of the result into memory obtained from HtmlAlloc()
** and invokes Tcl_ResetResult().
*/
char *
HtmlResolveUri(htmlPtr, zUri)
HtmlWidget *htmlPtr;
char *zUri;
{
char *azSeq[2];
char *zSrc = 0;
int result;
if (zUri == 0 || *zUri == 0)
return 0;
azSeq[0] = zUri;
azSeq[1] = 0;
HtmlLock(htmlPtr);
result = HtmlCallResolver(htmlPtr, azSeq);
if (HtmlUnlock(htmlPtr))
return 0;
if (result == TCL_OK) {
zSrc = HtmlAlloc(strlen(htmlPtr->interp->result) + 1);
if (zSrc)
strcpy(zSrc, htmlPtr->interp->result);
}
Tcl_ResetResult(htmlPtr->interp);
return zSrc;
}
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