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physfs.c
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/**
* PhysicsFS; a portable, flexible file i/o abstraction.
*
* Documentation is in physfs.h. It's verbose, honest. :)
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
#include "physfs.h"
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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typedef struct __PHYSFS_ERRMSGTYPE__
{
int tid;
int errorAvailable;
char errorString[80];
struct __PHYSFS_ERRMSGTYPE__ *next;
} ErrMsg;
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typedef struct __PHYSFS_DIRINFO__
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{
char *dirName;
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DirHandle *dirHandle;
struct __PHYSFS_DIRINFO__ *next;
} DirInfo;
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typedef struct __PHYSFS_FILEHANDLELIST__
{
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PHYSFS_file handle;
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struct __PHYSFS_FILEHANDLELIST__ *next;
} FileHandleList;
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/* The various i/o drivers... */
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#if (defined PHYSFS_SUPPORTS_ZIP)
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extern const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_ZIP;
extern const DirFunctions __PHYSFS_DirFunctions_ZIP;
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#endif
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#if (defined PHYSFS_SUPPORTS_GRP)
extern const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_GRP;
extern const DirFunctions __PHYSFS_DirFunctions_GRP;
#endif
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extern const DirFunctions __PHYSFS_DirFunctions_DIR;
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static const PHYSFS_ArchiveInfo *supported_types[] =
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{
#if (defined PHYSFS_SUPPORTS_ZIP)
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&__PHYSFS_ArchiveInfo_ZIP,
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#endif
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#if (defined PHYSFS_SUPPORTS_GRP)
&__PHYSFS_ArchiveInfo_GRP,
#endif
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NULL
};
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static const DirFunctions *dirFunctions[] =
{
#if (defined PHYSFS_SUPPORTS_ZIP)
&__PHYSFS_DirFunctions_ZIP,
#endif
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#if (defined PHYSFS_SUPPORTS_GRP)
&__PHYSFS_DirFunctions_GRP,
#endif
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&__PHYSFS_DirFunctions_DIR,
NULL
};
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/* General PhysicsFS state ... */
static int initialized = 0;
static ErrMsg *errorMessages = NULL;
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static DirInfo *searchPath = NULL;
static DirInfo *writeDir = NULL;
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static FileHandleList *openWriteList = NULL;
static FileHandleList *openReadList = NULL;
static char *baseDir = NULL;
static char *userDir = NULL;
static int allowSymLinks = 0;
/* functions ... */
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static ErrMsg *findErrorForCurrentThread(void)
{
ErrMsg *i;
int tid;
if (errorMessages != NULL)
{
tid = __PHYSFS_platformGetThreadID();
for (i = errorMessages; i != NULL; i = i->next)
{
if (i->tid == tid)
return(i);
} /* for */
} /* if */
return(NULL); /* no error available. */
} /* findErrorForCurrentThread */
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void __PHYSFS_setError(const char *str)
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{
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ErrMsg *err;
if (str == NULL)
return;
err = findErrorForCurrentThread();
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if (err == NULL)
{
err = (ErrMsg *) malloc(sizeof (ErrMsg));
if (err == NULL)
return; /* uhh...? */
err->tid = __PHYSFS_platformGetThreadID();
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err->next = errorMessages;
errorMessages = err;
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} /* if */
err->errorAvailable = 1;
strncpy(err->errorString, str, sizeof (err->errorString));
err->errorString[sizeof (err->errorString) - 1] = '\0';
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} /* __PHYSFS_setError */
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static void freeErrorMessages(void)
{
ErrMsg *i;
ErrMsg *next;
for (i = errorMessages; i != NULL; i = next)
{
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next = i->next;
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free(i);
} /* for */
} /* freeErrorMessages */
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const char *PHYSFS_getLastError(void)
{
ErrMsg *err = findErrorForCurrentThread();
if ((err == NULL) || (!err->errorAvailable))
return(NULL);
err->errorAvailable = 0;
return(err->errorString);
} /* PHYSFS_getLastError */
void PHYSFS_getLinkedVersion(PHYSFS_Version *ver)
{
if (ver != NULL)
{
ver->major = PHYSFS_VER_MAJOR;
ver->minor = PHYSFS_VER_MINOR;
ver->patch = PHYSFS_VER_PATCH;
} /* if */
} /* PHYSFS_getLinkedVersion */
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static DirHandle *openDirectory(const char *d, int forWriting)
{
const DirFunctions **i;
for (i = dirFunctions; *i != NULL; i++)
{
if ((*i)->isArchive(d, forWriting))
return( (*i)->openArchive(d, forWriting) );
} /* for */
__PHYSFS_setError(ERR_UNSUPPORTED_ARCHIVE);
return(NULL);
} /* openDirectory */
static DirInfo *buildDirInfo(const char *newDir, int forWriting)
{
DirHandle *dirHandle = NULL;
DirInfo *di = NULL;
BAIL_IF_MACRO(newDir == NULL, ERR_INVALID_ARGUMENT, 0);
dirHandle = openDirectory(newDir, forWriting);
BAIL_IF_MACRO(dirHandle == NULL, NULL, 0);
di = (DirInfo *) malloc(sizeof (DirInfo));
if (di == NULL)
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dirHandle->funcs->dirClose(dirHandle);
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BAIL_IF_MACRO(di == NULL, ERR_OUT_OF_MEMORY, 0);
di->dirName = (char *) malloc(strlen(newDir) + 1);
if (di->dirName == NULL)
{
free(di);
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dirHandle->funcs->dirClose(dirHandle);
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__PHYSFS_setError(ERR_OUT_OF_MEMORY);
return(0);
} /* if */
di->next = NULL;
di->dirHandle = dirHandle;
strcpy(di->dirName, newDir);
return(di);
} /* buildDirInfo */
static int freeDirInfo(DirInfo *di, FileHandleList *openList)
{
FileHandleList *i;
if (di == NULL)
return(1);
for (i = openList; i != NULL; i = i->next)
{
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const DirHandle *h = ((FileHandle *) &(i->handle.opaque))->dirHandle;
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BAIL_IF_MACRO(h == di->dirHandle, ERR_FILES_STILL_OPEN, 0);
} /* for */
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di->dirHandle->funcs->dirClose(di->dirHandle);
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free(di->dirName);
free(di);
return(1);
} /* freeDirInfo */
static char *calculateUserDir(void)
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{
char *retval = NULL;
const char *str = NULL;
str = __PHYSFS_platformGetUserDir();
if (str != NULL)
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retval = (char *) str;
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else
{
const char *dirsep = PHYSFS_getDirSeparator();
const char *uname = __PHYSFS_platformGetUserName();
str = (uname != NULL) ? uname : "default";
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retval = (char *) malloc(strlen(baseDir) + strlen(str) +
(strlen(dirsep) * 2) + 6);
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if (retval == NULL)
__PHYSFS_setError(ERR_OUT_OF_MEMORY);
else
sprintf(retval, "%s%susers%s%s", baseDir, dirsep, dirsep, str);
if (uname != NULL)
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free((void *) uname);
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} /* else */
return(retval);
} /* calculateUserDir */
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static int appendDirSep(char **dir)
{
const char *dirsep = PHYSFS_getDirSeparator();
char *ptr;
if (strcmp((*dir + strlen(*dir)) - strlen(dirsep), dirsep) == 0)
return(1);
ptr = realloc(*dir, strlen(*dir) + strlen(dirsep) + 1);
if (!ptr)
{
free(*dir);
return(0);
} /* if */
strcat(ptr, dirsep);
*dir = ptr;
return(1);
} /* appendDirSep */
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static char *calculateBaseDir(const char *argv0)
{
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const char *dirsep = PHYSFS_getDirSeparator();
char *retval;
char *ptr;
/*
* See if the platform driver wants to handle this for us...
*/
retval = __PHYSFS_platformCalcBaseDir(argv0);
if (retval != NULL)
return(retval);
/*
* Determine if there's a path on argv0. If there is, that's the base dir.
*/
ptr = strstr(argv0, dirsep);
if (ptr != NULL)
{
char *p = ptr;
size_t size;
while (p != NULL)
{
ptr = p;
p = strstr(p + 1, dirsep);
} /* while */
size = (size_t) (ptr - argv0); /* !!! is this portable? */
retval = (char *) malloc(size + 1);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
memcpy(retval, argv0, size);
retval[size] = '\0';
return(retval);
} /* if */
/*
* Last ditch effort: it's the current working directory. (*shrug*)
*/
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return(__PHYSFS_platformCurrentDir());
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} /* calculateBaseDir */
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int PHYSFS_init(const char *argv0)
{
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char *ptr;
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BAIL_IF_MACRO(initialized, ERR_IS_INITIALIZED, 0);
BAIL_IF_MACRO(argv0 == NULL, ERR_INVALID_ARGUMENT, 0);
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baseDir = calculateBaseDir(argv0);
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BAIL_IF_MACRO(baseDir == NULL, NULL, 0);
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ptr = __PHYSFS_platformRealPath(baseDir);
free(baseDir);
BAIL_IF_MACRO(ptr == NULL, NULL, 0);
baseDir = ptr;
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BAIL_IF_MACRO(!appendDirSep(&baseDir), NULL, 0);
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userDir = calculateUserDir();
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if (userDir != NULL)
{
ptr = __PHYSFS_platformRealPath(userDir);
free(userDir);
userDir = ptr;
} /* if */
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if ((userDir == NULL) || (!appendDirSep(&userDir)))
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{
free(baseDir);
baseDir = NULL;
return(0);
} /* if */
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initialized = 1;
return(1);
} /* PHYSFS_init */
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static int closeFileHandleList(FileHandleList **list)
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{
FileHandleList *i;
FileHandleList *next = NULL;
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FileHandle *h;
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for (i = *list; i != NULL; i = next)
{
next = i->next;
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h = (FileHandle *) (i->handle.opaque);
if (!h->funcs->fileClose(h))
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{
*list = i;
return(0);
} /* if */
free(i);
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} /* for */
*list = NULL;
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return(1);
} /* closeFileHandleList */
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static void freeSearchPath(void)
{
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DirInfo *i;
DirInfo *next = NULL;
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closeFileHandleList(&openReadList);
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if (searchPath != NULL)
{
for (i = searchPath; i != NULL; i = next)
{
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next = i->next;
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freeDirInfo(i, openReadList);
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} /* for */
searchPath = NULL;
} /* if */
} /* freeSearchPath */
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int PHYSFS_deinit(void)
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{
BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
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closeFileHandleList(&openWriteList);
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BAIL_IF_MACRO(!PHYSFS_setWriteDir(NULL), ERR_FILES_STILL_OPEN, 0);
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freeSearchPath();
freeErrorMessages();
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if (baseDir != NULL)
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{
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free(baseDir);
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baseDir = NULL;
} /* if */
if (userDir != NULL)
{
free(userDir);
userDir = NULL;
} /* if */
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allowSymLinks = 0;
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initialized = 0;
return(1);
} /* PHYSFS_deinit */
const PHYSFS_ArchiveInfo **PHYSFS_supportedArchiveTypes(void)
{
return(supported_types);
} /* PHYSFS_supportedArchiveTypes */
void PHYSFS_freeList(void *list)
{
void **i;
for (i = (void **) list; *i != NULL; i++)
free(*i);
free(list);
} /* PHYSFS_freeList */
const char *PHYSFS_getDirSeparator(void)
{
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return(__PHYSFS_platformDirSeparator);
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} /* PHYSFS_getDirSeparator */
char **PHYSFS_getCdRomDirs(void)
{
return(__PHYSFS_platformDetectAvailableCDs());
} /* PHYSFS_getCdRomDirs */
const char *PHYSFS_getBaseDir(void)
{
return(baseDir); /* this is calculated in PHYSFS_init()... */
} /* PHYSFS_getBaseDir */
const char *PHYSFS_getUserDir(void)
{
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return(userDir); /* this is calculated in PHYSFS_init()... */
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} /* PHYSFS_getUserDir */
const char *PHYSFS_getWriteDir(void)
{
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if (writeDir == NULL)
return(NULL);
return(writeDir->dirName);
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} /* PHYSFS_getWriteDir */
int PHYSFS_setWriteDir(const char *newDir)
{
if (writeDir != NULL)
{
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BAIL_IF_MACRO(!freeDirInfo(writeDir, openWriteList), NULL, 0);
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writeDir = NULL;
} /* if */
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if (newDir != NULL)
{
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writeDir = buildDirInfo(newDir, 1);
return(writeDir != NULL);
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} /* if */
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return(1);
} /* PHYSFS_setWriteDir */
int PHYSFS_addToSearchPath(const char *newDir, int appendToPath)
{
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DirInfo *di = buildDirInfo(newDir, 0);
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BAIL_IF_MACRO(di == NULL, NULL, 0);
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if (appendToPath)
{
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DirInfo *i = searchPath;
DirInfo *prev = NULL;
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di->next = NULL;
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while (i != NULL)
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{
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prev = i;
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i = i->next;
} /* while */
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if (prev == NULL)
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searchPath = di;
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else
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prev->next = di;
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} /* if */
else
{
di->next = searchPath;
searchPath = di;
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} /* else */
return(1);
} /* PHYSFS_addToSearchPath */
int PHYSFS_removeFromSearchPath(const char *oldDir)
{
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DirInfo *i;
DirInfo *prev = NULL;
DirInfo *next = NULL;
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BAIL_IF_MACRO(oldDir == NULL, ERR_INVALID_ARGUMENT, 0);
for (i = searchPath; i != NULL; i = i->next)
{
if (strcmp(i->dirName, oldDir) == 0)
{
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next = i->next;
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BAIL_IF_MACRO(!freeDirInfo(i, openReadList), NULL, 0);
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if (prev == NULL)
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searchPath = next;
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else
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prev->next = next;
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return(1);
} /* if */
prev = i;
} /* for */
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__PHYSFS_setError(ERR_NOT_IN_SEARCH_PATH);
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return(0);
} /* PHYSFS_removeFromSearchPath */
char **PHYSFS_getSearchPath(void)
{
int count = 1;
int x;
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DirInfo *i;
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char **retval;
for (i = searchPath; i != NULL; i = i->next)
count++;
retval = (char **) malloc(sizeof (char *) * count);
BAIL_IF_MACRO(!retval, ERR_OUT_OF_MEMORY, NULL);
count--;
retval[count] = NULL;
for (i = searchPath, x = 0; x < count; i = i->next, x++)
{
retval[x] = (char *) malloc(strlen(i->dirName) + 1);
if (retval[x] == NULL) /* this is friggin' ugly. */
{
while (x > 0)
{
x--;
free(retval[x]);
} /* while */
free(retval);
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__PHYSFS_setError(ERR_OUT_OF_MEMORY);
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return(NULL);
} /* if */
strcpy(retval[x], i->dirName);
} /* for */
return(retval);
} /* PHYSFS_getSearchPath */
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int PHYSFS_setSaneConfig(const char *appName, const char *archiveExt,
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int includeCdRoms, int archivesFirst)
{
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const char *basedir = PHYSFS_getBaseDir();
const char *userdir = PHYSFS_getUserDir();
const char *dirsep = PHYSFS_getDirSeparator();
char *str;
/* set write dir... */
str = malloc(strlen(userdir) + (strlen(appName) * 2) +
(strlen(dirsep) * 2) + 2);
BAIL_IF_MACRO(str == NULL, ERR_OUT_OF_MEMORY, 0);
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sprintf(str, "%s.%s", userdir, appName);
if (!PHYSFS_setWriteDir(str))
{
if ( (!PHYSFS_setWriteDir(userdir)) ||
(!PHYSFS_mkdir(str + strlen(userdir))) )
{
PHYSFS_setWriteDir(NULL);
free(str);
BAIL_IF_MACRO(1, ERR_CANT_SET_WRITE_DIR, 0);
} /* if */
} /* if */
if (!PHYSFS_setWriteDir(str))
{
PHYSFS_setWriteDir(NULL);
free(str);
BAIL_IF_MACRO(1, ERR_CANT_SET_WRITE_DIR, 0);
} /* if */
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/* Put write dir related dirs on search path... */
PHYSFS_addToSearchPath(str, 1);
PHYSFS_mkdir(appName); /* don't care if this fails. */
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strcat(str, dirsep);
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strcat(str, appName);
PHYSFS_addToSearchPath(str, 1);
free(str);
/* Put base path stuff on search path... */
PHYSFS_addToSearchPath(basedir, 1);
str = malloc(strlen(basedir) + (strlen(appName) * 2) +
(strlen(dirsep) * 2) + 2);
if (str != NULL)
{
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sprintf(str, "%s.%s", basedir, appName);
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PHYSFS_addToSearchPath(str, 1);
free(str);
} /* if */
/* handle CD-ROMs... */
if (includeCdRoms)
{
char **cds = PHYSFS_getCdRomDirs();
char **i;
for (i = cds; *i != NULL; i++)
{
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PHYSFS_addToSearchPath(*i, 1);
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str = malloc(strlen(*i) + strlen(appName) + strlen(dirsep) + 1);
if (str != NULL)
{
sprintf(str, "%s%s%s", *i, dirsep, appName);
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PHYSFS_addToSearchPath(str, 1);
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free(str);
} /* if */
} /* for */
PHYSFS_freeList(cds);
} /* if */
/* Root out archives, and add them to search path... */
if (archiveExt != NULL)
{
char **rc = PHYSFS_enumerateFiles("");
char **i;
int extlen = strlen(archiveExt);
char *ext;
for (i = rc; *i != NULL; i++)
{
int l = strlen(*i);
if ((l > extlen) && ((*i)[l - extlen - 1] == '.'));
{
ext = (*i) + (l - extlen);
if (__PHYSFS_platformStricmp(ext, archiveExt) == 0)
{
const char *d = PHYSFS_getRealDir(*i);
str = malloc(strlen(d) + strlen(dirsep) + l + 1);
if (str != NULL)
{
sprintf(str, "%s%s%s", d, dirsep, *i);
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PHYSFS_addToSearchPath(str, archivesFirst == 0);
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free(str);
} /* if */
} /* if */
} /* if */
} /* for */
PHYSFS_freeList(rc);
} /* if */
return(1);
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} /* PHYSFS_setSaneConfig */
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void PHYSFS_permitSymbolicLinks(int allow)
{
allowSymLinks = allow;
} /* PHYSFS_permitSymbolicLinks */
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/* string manipulation in C makes my ass itch. */
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char *__PHYSFS_convertToDependent(const char *prepend,
const char *dirName,
const char *append)
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{
const char *dirsep = PHYSFS_getDirSeparator();
int sepsize = strlen(dirsep);
char *str;
char *i1;
char *i2;
size_t allocSize;
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746
747
while (*dirName == '/')
dirName++;
748
allocSize = strlen(dirName) + 1;
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if (prepend != NULL)
allocSize += strlen(prepend) + sepsize;
if (append != NULL)
allocSize += strlen(append) + sepsize;
/* make sure there's enough space if the dir separator is bigger. */
if (sepsize > 1)
{
757
758
str = (char *) dirName;
do
759
{
760
761
762
str = strchr(str, '/');
if (str != NULL)
{
763
allocSize += (sepsize - 1);
764
765
766
str++;
} /* if */
} while (str != NULL);
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768
769
770
771
} /* if */
str = (char *) malloc(allocSize);
BAIL_IF_MACRO(str == NULL, ERR_OUT_OF_MEMORY, NULL);
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773
774
if (prepend == NULL)
*str = '\0';
else
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776
777
{
strcpy(str, prepend);
strcat(str, dirsep);
778
} /* else */
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780
for (i1 = (char *) dirName, i2 = str + strlen(str); *i1; i1++, i2++)
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800
{
if (*i1 == '/')
{
strcpy(i2, dirsep);
i2 += sepsize;
} /* if */
else
{
*i2 = *i1;
} /* else */
} /* for */
*i2 = '\0';
if (append)
{
strcat(str, dirsep);
strcpy(str, append);
} /* if */
return(str);
801
} /* __PHYSFS_convertToDependentNotation */
802
803
804
int __PHYSFS_verifySecurity(DirHandle *h, const char *fname)
805
{
806
807
808
int retval = 1;
char *start;
char *end;
809
810
char *str;
811
812
813
start = str = malloc(strlen(fname) + 1);
BAIL_IF_MACRO(str == NULL, ERR_OUT_OF_MEMORY, 0);
strcpy(str, fname);
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815
816
817
818
819
820
821
822
while (1)
{
end = strchr(start, '/');
if (end != NULL)
*end = '\0';
if ( (strcmp(start, ".") == 0) ||
(strcmp(start, "..") == 0) ||
823
(strchr(start, '\\') != NULL) ||
824
825
826
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829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
(strchr(start, ':') != NULL) )
{
__PHYSFS_setError(ERR_INSECURE_FNAME);
retval = 0;
break;
} /* if */
if ((!allowSymLinks) && (h->funcs->isSymLink(h, str)))
{
__PHYSFS_setError(ERR_SYMLINK_DISALLOWED);
retval = 0;
break;
} /* if */
if (end == NULL)
break;
*end = '/';
start = end + 1;
} /* while */
844
845
free(str);
846
847
return(retval);
} /* __PHYSFS_verifySecurity */
848
849
850
int PHYSFS_mkdir(const char *dirName)
851
{
852
DirHandle *h;
853
char *str;
854
855
856
char *start;
char *end;
int retval = 0;
857
858
BAIL_IF_MACRO(writeDir == NULL, ERR_NO_WRITE_DIR, 0);
859
860
h = writeDir->dirHandle;
861
862
863
864
while (*dirName == '/')
dirName++;
865
866
BAIL_IF_MACRO(h->funcs->mkdir == NULL, ERR_NOT_SUPPORTED, 0);
BAIL_IF_MACRO(!__PHYSFS_verifySecurity(h, dirName), NULL, 0);
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868
869
870
start = str = malloc(strlen(dirName) + 1);
BAIL_IF_MACRO(str == NULL, ERR_OUT_OF_MEMORY, 0);
strcpy(str, dirName);
871
872
873
874
875
876
while (1)
{
end = strchr(start, '/');
if (end != NULL)
*end = '\0';
877
878
879
880
retval = h->funcs->mkdir(h, str);
if (!retval)
break;
881
882
883
if (end == NULL)
break;
884
885
886
887
*end = '/';
start = end + 1;
} /* while */
888
889
890
891
892
893
894
free(str);
return(retval);
} /* PHYSFS_mkdir */
int PHYSFS_delete(const char *fname)
895
{
896
897
898
899
DirHandle *h;
BAIL_IF_MACRO(writeDir == NULL, ERR_NO_WRITE_DIR, 0);
h = writeDir->dirHandle;
BAIL_IF_MACRO(h->funcs->remove == NULL, ERR_NOT_SUPPORTED, 0);
900
901
902
903
while (*fname == '/')
fname++;
904
905
906
BAIL_IF_MACRO(!__PHYSFS_verifySecurity(h, fname), NULL, 0);
return(h->funcs->remove(h, fname));
} /* PHYSFS_delete */
907
908
909
910
const char *PHYSFS_getRealDir(const char *filename)
{
911
912
DirInfo *i;
913
914
915
while (*filename == '/')
filename++;
916
917
918
919
920
921
922
923
924
925
926
for (i = searchPath; i != NULL; i = i->next)
{
DirHandle *h = i->dirHandle;
if (__PHYSFS_verifySecurity(h, filename))
{
if (h->funcs->exists(h, filename))
return(i->dirName);
} /* if */
} /* for */
return(NULL);
927
928
929
} /* PHYSFS_getRealDir */
930
static int countList(LinkedStringList *list)
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
{
int retval = 0;
LinkedStringList *i;
for (i = list; i != NULL; i = i->next)
retval++;
return(retval);
} /* countList */
static char **convertStringListToPhysFSList(LinkedStringList *finalList)
{
int i;
LinkedStringList *next = NULL;
int len = countList(finalList);
char **retval = (char **) malloc((len + 1) * sizeof (char *));
if (retval == NULL)
__PHYSFS_setError(ERR_OUT_OF_MEMORY);
for (i = 0; i < len; i++)
{
next = finalList->next;
if (retval == NULL)
free(finalList->str);
else
retval[i] = finalList->str;
free(finalList);
finalList = next;
} /* for */
if (retval != NULL);
retval[i] = NULL;
return(retval);
} /* convertStringListToPhysFSList */
static void insertStringListItem(LinkedStringList **final,
LinkedStringList *item)
{
LinkedStringList *i;
LinkedStringList *prev = NULL;
int rc;
for (i = *final; i != NULL; i = i->next)
{
rc = strcmp(i->str, item->str);
980
981
982
if (rc > 0) /* insertion point. */
break;
else if (rc == 0) /* already in list. */
983
984
985
986
987
988
989
{
free(item->str);
free(item);
return;
} /* else if */
prev = i;
} /* for */
990
991
992
993
994
995
996
997
998
999
1000
/*
* If we are here, we are either at the insertion point.
* This may be the end of the list, or the list may be empty, too.
*/
if (prev == NULL)
*final = item;
else
prev->next = item;
item->next = i;