gecko-dev/xpcom/glue/nsINIParser.cpp
2005-11-02 20:38:21 +00:00

274 lines
7.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Samir Gehani <sgehani@netscape.com>
* Benjamin Smedberg <bsmedberg@covad.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsINIParser.h"
#include "nsError.h"
#include "nsILocalFile.h"
#include "nsCRTGlue.h"
#include <stdlib.h>
#include <stdio.h>
#if defined(XP_WIN) || defined(XP_OS2)
#define BINARY_MODE "b"
#else
#define BINARY_MODE
#endif
// Stack based FILE wrapper to ensure that fclose is called, copied from
// toolkit/mozapps/update/src/updater/readstrings.cpp
class AutoFILE {
public:
AutoFILE(FILE *fp = nsnull) : fp_(fp) {}
~AutoFILE() { if (fp_) fclose(fp_); }
operator FILE *() { return fp_; }
FILE** operator &() { return &fp_; }
private:
FILE *fp_;
};
nsresult
nsINIParser::Init(nsILocalFile* aFile)
{
nsresult rv;
/* open the file */
AutoFILE fd;
rv = aFile->OpenANSIFileDesc("r" BINARY_MODE, &fd);
if (NS_FAILED(rv))
return rv;
return InitFromFILE(fd);
}
nsresult
nsINIParser::Init(const char *aPath)
{
/* open the file */
AutoFILE fd = fopen(aPath, "r" BINARY_MODE);
if (!fd)
return NS_ERROR_FAILURE;
return InitFromFILE(fd);
}
static const char kNL[] = "\r\n";
static const char kEquals[] = "=";
static const char kWhitespace[] = " \t";
static const char kRBracket[] = "]";
nsresult
nsINIParser::InitFromFILE(FILE *fd)
{
if (!mSections.Init())
return NS_ERROR_OUT_OF_MEMORY;
/* get file size */
if (fseek(fd, 0, SEEK_END) != 0)
return NS_ERROR_FAILURE;
long flen = ftell(fd);
if (flen == 0)
return NS_ERROR_FAILURE;
/* malloc an internal buf the size of the file */
mFileContents = new char[flen + 1];
if (!mFileContents)
return NS_ERROR_OUT_OF_MEMORY;
/* read the file in one swoop */
if (fseek(fd, 0, SEEK_SET) != 0)
return NS_BASE_STREAM_OSERROR;
int rd = fread(mFileContents, sizeof(char), flen, fd);
if (rd != flen)
return NS_BASE_STREAM_OSERROR;
mFileContents[flen] = '\0';
char *buffer = mFileContents;
char *currSection = nsnull;
INIValue *last = nsnull;
// outer loop tokenizes into lines
while (char *token = NS_strtok(kNL, &buffer)) {
if (token[0] == '#' || token[0] == ';') // it's a comment
continue;
token = (char*) NS_strspnp(kWhitespace, token);
if (!*token) // empty line
continue;
if (token[0] == '[') { // section header!
++token;
currSection = token;
last = nsnull;
char *rb = NS_strtok(kRBracket, &token);
if (!rb || NS_strtok(kWhitespace, &token)) {
// there's either an unclosed [Section or a [Section]Moretext!
// we could frankly decide that this INI file is malformed right
// here and stop, but we won't... keep going, looking for
// a well-formed [section] to continue working with
currSection = nsnull;
}
continue;
}
if (!currSection) {
// If we haven't found a section header (or we found a malformed
// section header), don't bother parsing this line.
continue;
}
char *key = token;
char *e = NS_strtok(kEquals, &token);
if (!e)
continue;
INIValue *val = new INIValue(key, token);
if (!val)
return NS_ERROR_OUT_OF_MEMORY;
// If we haven't already added something to this section, "last" will
// be null.
if (!last) {
mSections.Get(currSection, &last);
while (last && last->next)
last = last->next;
}
if (last) {
// Add this element on to the tail of the existing list
last->next = val;
last = val;
continue;
}
// We've never encountered this section before, add it to the head
mSections.Put(currSection, val);
}
return NS_OK;
}
nsresult
nsINIParser::GetString(const char *aSection, const char *aKey,
nsACString &aResult)
{
INIValue *val;
mSections.Get(aSection, &val);
while (val) {
if (strcmp(val->key, aKey) == 0) {
aResult.Assign(val->value);
return NS_OK;
}
val = val->next;
}
return NS_ERROR_FAILURE;
}
nsresult
nsINIParser::GetString(const char *aSection, const char *aKey,
char *aResult, PRUint32 aResultLen)
{
INIValue *val;
mSections.Get(aSection, &val);
while (val) {
if (strcmp(val->key, aKey) == 0) {
strncpy(aResult, val->value, aResultLen);
aResult[aResultLen - 1] = '\0';
if (strlen(val->value) >= aResultLen)
return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
return NS_OK;
}
val = val->next;
}
return NS_ERROR_FAILURE;
}
PLDHashOperator
nsINIParser::GetSectionsCB(const char *aKey, INIValue *aData,
void *aClosure)
{
GSClosureStruct *cs = NS_REINTERPRET_CAST(GSClosureStruct*, aClosure);
return cs->usercb(aKey, cs->userclosure) ? PL_DHASH_NEXT : PL_DHASH_STOP;
}
nsresult
nsINIParser::GetSections(INISectionCallback aCB, void *aClosure)
{
GSClosureStruct gs = {
aCB,
aClosure
};
mSections.EnumerateRead(GetSectionsCB, &gs);
return NS_OK;
}
nsresult
nsINIParser::GetStrings(const char *aSection,
INIStringCallback aCB, void *aClosure)
{
INIValue *val;
for (mSections.Get(aSection, &val);
val;
val = val->next) {
if (!aCB(val->key, val->value, aClosure))
return NS_OK;
}
return NS_OK;
}