/* Copyright (C) 2000-2004 by George Williams */
/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.

 * The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include "ustring.h"
#include "fileutil.h"
#include "gfile.h"
#include <sys/types.h>
#include <sys/stat.h>		/* for mkdir */
#include <unistd.h>

#ifdef _WIN32
#define MKDIR(A,B) mkdir(A)
#else
#define MKDIR(A,B) mkdir(A,B)
#endif

static char dirname_[1024];

char *GFileGetAbsoluteName(char *name, char *result, int rsiz) {
    /* result may be the same as name */
    char buffer[1000];

    if ( *name!='/' ) {
	char *pt, *spt, *rpt, *bpt;

	if ( dirname_[0]=='\0' ) {
	    getcwd(dirname_,sizeof(dirname_));
	}
	strcpy(buffer,dirname_);
	if ( buffer[strlen(buffer)-1]!='/' )
	    strcat(buffer,"/");
	strcat(buffer,name);

	/* Normalize out any .. */
	spt = rpt = buffer;
	while ( *spt!='\0' ) {
	    if ( *spt=='/' ) ++spt;
	    for ( pt = spt; *pt!='\0' && *pt!='/'; ++pt );
	    if ( pt==spt )	/* Found // in a path spec, reduce to / (we've*/
		strcpy(spt,pt); /*  skipped past the :// of the machine name) */
	    else if ( pt==spt+1 && spt[0]=='.' )	/* Noop */
		strcpy(spt,pt);
	    else if ( pt==spt+2 && spt[0]=='.' && spt[1]=='.' ) {
		for ( bpt=spt-2 ; bpt>rpt && *bpt!='/'; --bpt );
		if ( bpt>=rpt && *bpt=='/' ) {
		    strcpy(bpt,pt);
		    spt = bpt;
		} else {
		    rpt = pt;
		    spt = pt;
		}
	    } else
		spt = pt;
	}
	name = buffer;
	if ( rsiz>sizeof(buffer)) rsiz = sizeof(buffer);	/* Else valgrind gets unhappy */
    }
    if (result!=name) {
	strncpy(result,name,rsiz);
	result[rsiz-1]='\0';
    }
return(result);
}

char *GFileMakeAbsoluteName(char *name) {
    char buffer[1025];

    GFileGetAbsoluteName(name,buffer,sizeof(buffer));
return( copy(buffer));
}

char *GFileBuildName(char *dir,char *fname,char *buffer,int size) {
    int len;

    if ( dir==NULL || *dir=='\0' ) {
	if ( strlen( fname )<size-1 )		/* valgrind didn't like my strncpies but this complication makes it happy */
	    strcpy(buffer,fname);
	else {
	    strncpy(buffer,fname,size-1);
	    buffer[size-1]='\0';
	}
    } else {
	if ( buffer!=dir ) {
	    if ( strlen( dir )<size-3 )
		strcpy(buffer,dir);
	    else {
		strncpy(buffer,dir,size-3);
		buffer[size-3]='\0';
	    }
	}
	len = strlen(buffer);
	if ( buffer[len-1]!='/' )
	    buffer[len++] = '/';
	if ( strlen( fname )<size-1 )
	    strcpy(buffer+len,fname);
	else {
	    strncpy(buffer+len,fname,size-len-1);
	    buffer[size-1]='\0';
	}
    }
return( buffer );
}

/* Given a filename in a directory, pick the directory out of it, and */
/*  create a new filename using that directory and the given nametail */
char *GFileReplaceName(char *oldname,char *fname,char *buffer,int size) {
    int len;
    char *dirend;

    dirend = strrchr(oldname,'/');
    if ( dirend == NULL ) {
	strncpy(buffer,fname,size-1);
	buffer[size-1]='\0';
    } else {
	*dirend = '\0';
	if ( buffer!=oldname ) {
	    strncpy(buffer,oldname,size-3);
	    buffer[size-3]='\0';
	}
	len = strlen(buffer);
	*dirend = '/';
	buffer[len++] = '/';
	strncpy(buffer+len,fname,size-len-1);
	buffer[size-1]='\0';
    }
return( buffer );
}

char *GFileNameTail(const char *oldname) {
    char *pt;

    pt = strrchr(oldname,'/');
    if ( pt !=NULL )
return( pt+1);
    else
return( (char *)oldname );
}

char *GFileAppendFile(char *dir,char *name,int isdir) {
    char *ret, *pt;

    ret = galloc((strlen(dir)+strlen(name)+3));
    strcpy(ret,dir);
    pt = ret+strlen(ret);
    if ( pt>ret && pt[-1]!='/' )
	*pt++ = '/';
    strcpy(pt,name);
    if ( isdir ) {
	pt += strlen(pt);
	if ( pt>ret && pt[-1]!='/' ) {
	    *pt++ = '/';
	    *pt = '\0';
	}
    }
return(ret);
}

int GFileIsAbsolute(const char *file) {
    if ( *file=='/' )
return( true );
    if ( strstr(file,"://")!=NULL )
return( true );

return( false );
}

int GFileIsDir(const char *file) {
#ifdef _WIN32
  struct stat info;
  if (stat(file, &info))
return 0;     
  else
return ((info.st_mode&_S_IFDIR));
#else
    char buffer[1000];
    sprintf(buffer,"%s/.",file);
return( access(buffer,0)==0 );
#endif
}

int GFileExists(const char *file) {
return( access(file,0)==0 );
}

int GFileModifyable(const char *file) {
return( access(file,02)==0 );
}

int GFileModifyableDir(const char *file) {
    char buffer[1024], *pt;

    strcpy(buffer,file);
    pt = strrchr(buffer,'/');
    if ( pt==NULL )
	strcpy(buffer,".");
    else
	*pt='\0';
return( GFileModifyable(buffer));
}

int GFileReadable(char *file) {
return( access(file,04)==0 );
}

int GFileMkDir(char *name) {
return( MKDIR(name,0755));
}

int GFileRmDir(char *name) {
return(rmdir(name));
}

int GFileUnlink(char *name) {
return(unlink(name));
}

char *_GFile_find_program_dir(char *prog) {
    char *pt, *path, *program_dir=NULL;
    char filename[2000];

    if ( (pt = strrchr(prog,'/'))!=NULL )
	program_dir = copyn(prog,pt-prog);
    else if ( (path = getenv("PATH"))!=NULL ) {
	while ((pt = strchr(path,':'))!=NULL ) {
	  sprintf(filename,"%.*s/%s", (int)(pt-path), path, prog);
	    /* Under cygwin, applying access to "potrace" will find "potrace.exe" */
	    /*  no need for special check to add ".exe" */
	    if ( access(filename,1)!= -1 ) {
		program_dir = copyn(path,pt-path);
	break;
	    }
	    path = pt+1;
	}
	if ( program_dir==NULL ) {
	    sprintf(filename,"%s/%s", path, prog);
	    if ( access(filename,1)!= -1 )
		program_dir = copy(path);
	}
    }
    if ( program_dir==NULL )
return( NULL );
    GFileGetAbsoluteName(program_dir,filename,sizeof(filename));
    gfree(program_dir);
    program_dir = copy(filename);
return( program_dir );
}

unichar_t *u_GFileGetAbsoluteName(unichar_t *name, unichar_t *result, int rsiz) {
    /* result may be the same as name */
    unichar_t buffer[1000];

    if ( *name!='/' ) {
	unichar_t *pt, *spt, *rpt, *bpt;

	if ( dirname_[0]=='\0' ) {
	    getcwd(dirname_,sizeof(dirname_));
	}
	uc_strcpy(buffer,dirname_);
	if ( buffer[u_strlen(buffer)-1]!='/' )
	    uc_strcat(buffer,"/");
	u_strcat(buffer,name);

	/* Normalize out any .. */
	spt = rpt = buffer;
	while ( *spt!='\0' ) {
	    if ( *spt=='/' ) ++spt;
	    for ( pt = spt; *pt!='\0' && *pt!='/'; ++pt );
	    if ( pt==spt )	/* Found // in a path spec, reduce to / (we've*/
		u_strcpy(spt,pt); /*  skipped past the :// of the machine name) */
	    else if ( pt==spt+1 && spt[0]=='.' )	/* Noop */
		u_strcpy(spt,pt);
	    else if ( pt==spt+2 && spt[0]=='.' && spt[1]=='.' ) {
		for ( bpt=spt-2 ; bpt>rpt && *bpt!='/'; --bpt );
		if ( bpt>=rpt && *bpt=='/' ) {
		    u_strcpy(bpt,pt);
		    spt = bpt;
		} else {
		    rpt = pt;
		    spt = pt;
		}
	    } else
		spt = pt;
	}
	name = buffer;
    }
    if (result!=name) {
	u_strncpy(result,name,rsiz);
	result[rsiz-1]='\0';
    }
return(result);
}

unichar_t *u_GFileBuildName(unichar_t *dir,unichar_t *fname,unichar_t *buffer,int size) {
    int len;

    if ( dir==NULL || *dir=='\0' ) {
	u_strncpy(buffer,fname,size-1);
	buffer[size-1]='\0';
    } else {
	if ( buffer!=dir ) {
	    u_strncpy(buffer,dir,size-3);
	    buffer[size-3]='\0';
	}
	len = u_strlen(buffer);
	if ( buffer[len-1]!='/' )
	    buffer[len++] = '/';
	u_strncpy(buffer+len,fname,size-len-1);
	buffer[size-1]='\0';
    }
return( buffer );
}

/* Given a filename in a directory, pick the directory out of it, and */
/*  create a new filename using that directory and the given nametail */
unichar_t *u_GFileReplaceName(unichar_t *oldname,unichar_t *fname,unichar_t *buffer,int size) {
    int len;
    unichar_t *dirend;

    dirend = u_strrchr(oldname,'/');
    if ( dirend == NULL ) {
	u_strncpy(buffer,fname,size-1);
	buffer[size-1]='\0';
    } else {
	*dirend = '\0';
	if ( buffer!=oldname ) {
	    u_strncpy(buffer,oldname,size-3);
	    buffer[size-3]='\0';
	}
	len = u_strlen(buffer);
	*dirend = '/';
	buffer[len++] = '/';
	u_strncpy(buffer+len,fname,size-len-1);
	buffer[size-1]='\0';
    }
return( buffer );
}

unichar_t *u_GFileNameTail(const unichar_t *oldname) {
    unichar_t *pt;

    pt = u_strrchr(oldname,'/');
    if ( pt !=NULL )
return( pt+1);
    else
return( (unichar_t *)oldname );
}

unichar_t *u_GFileNormalize(unichar_t *name) {
    unichar_t *pt, *base, *ppt;

    if ( (pt = uc_strstr(name,"://"))!=NULL ) {
	base = u_strchr(pt+3,'/');
	if ( base==NULL )
return( name );
	++base;
    } else if ( *name=='/' )
	base = name+1;
    else
	base = name;
    for ( pt=base; *pt!='\0'; ) {
	if ( *pt=='/' )
	    u_strcpy(pt,pt+1);
	else if ( uc_strncmp(pt,"./",2)==0 )
	    u_strcpy(pt,pt+2);
	else if ( uc_strncmp(pt,"../",2)==0 ) {
	    for ( ppt=pt-2; ppt>=base && *ppt!='/'; --ppt );
	    ++ppt;
	    if ( ppt>=base ) {
		u_strcpy(ppt,pt+3);
		pt = ppt;
	    } else
		pt += 3;
	} else {
	    while ( *pt!='/' && *pt!='\0' ) ++pt;
	    if ( *pt == '/' ) ++pt;
	}
    }
return( name );
}

unichar_t *u_GFileAppendFile(unichar_t *dir,unichar_t *name,int isdir) {
    unichar_t *ret, *pt;

    ret = galloc((u_strlen(dir)+u_strlen(name)+3)*sizeof(unichar_t));
    u_strcpy(ret,dir);
    pt = ret+u_strlen(ret);
    if ( pt>ret && pt[-1]!='/' )
	*pt++ = '/';
    u_strcpy(pt,name);
    if ( isdir ) {
	pt += u_strlen(pt);
	if ( pt>ret && pt[-1]!='/' ) {
	    *pt++ = '/';
	    *pt = '\0';
	}
    }
return(ret);
}

int u_GFileIsAbsolute(const unichar_t *file) {
    if ( *file=='/' )
return( true );
    if ( uc_strstr(file,"://")!=NULL )
return( true );

return( false );
}

int u_GFileIsDir(const unichar_t *file) {
    char buffer[1024];
    cu_strcpy(buffer,file);
    strcat(buffer,"/.");
return( access(buffer,0)==0 );
}

int u_GFileExists(const unichar_t *file) {
    char buffer[1024];
    cu_strcpy(buffer,file);
return( access(buffer,0)==0 );
}

int u_GFileModifyable(const unichar_t *file) {
    char buffer[1024];
    cu_strcpy(buffer,file);
return( access(buffer,02)==0 );
}

int u_GFileModifyableDir(const unichar_t *file) {
    char buffer[1024], *pt;

    cu_strcpy(buffer,file);
    pt = strrchr(buffer,'/');
    if ( pt==NULL )
	strcpy(buffer,".");
    else
	*pt='\0';
return( GFileModifyable(buffer));
}

int u_GFileReadable(unichar_t *file) {
    char buffer[1024];
    cu_strcpy(buffer,file);
return( access(buffer,04)==0 );
}

int u_GFileMkDir(unichar_t *name) {
    char buffer[1024];
    cu_strcpy(buffer,name);
return( MKDIR(buffer,0755));
}

int u_GFileRmDir(unichar_t *name) {
    char buffer[1024];
    cu_strcpy(buffer,name);
return(rmdir(buffer));
}

int u_GFileUnlink(unichar_t *name) {
    char buffer[1024];
    cu_strcpy(buffer,name);
return(unlink(buffer));
}