Subversion Repositories Kolibri OS

/* open.c -- open a file.

 *

 * Copyright (c) 1995 Cygnus Support

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include 

#include 

#include 

#include 

#include "glue.h"

#include "io.h"

#undef erro

extern int errno;

static inline int is_slash(char c)

{

    return c=='/' || c=='\\';

}

void fix_slashes(char * in,char * out)

{

    int slash_count;

    for(slash_count=1;in && out && *in;in++)

    {

        if(is_slash(*in))

        {

            slash_count++;

            continue;

        }

        else

        {

            if(slash_count)

            {

                slash_count=0;

                *out++='/';

            }

            *out++=*in;

        }

    }

    *out='\0';

};

void buildpath(char *buf, const char* file)

{

    char *ptr;

    ptr = buf + strlen(buf);

    while (*file)

    {

        if (file[0] == '.' && file[1] == 0)

            break;

        if (file[0] == '.' && file[1] == '/')

        {

            file+=2;

            continue;

        };

        if (file[0] == '.' && file[1] == '.' &&

            (file[2] == 0 || file[2] == '/'))

        {

            while (ptr > buf && ptr[-1] != '/')

                --ptr;

            file+=2;

            if (*file == 0)

                break;

            ++file;

            continue;

        }

        *ptr++ = '/';

        if (*file == '/')

            ++file;

        while (*file && *file!='/')

            *ptr++ = *file++;

    }

    *ptr = 0;

};

static char *getccwd(char *buf, size_t size)

{

    int bsize;

    __asm__ __volatile__(

    "int $0x40"

    :"=a"(bsize)

    :"a"(30),"b"(2),"c"(buf), "d"(size)

    :"memory");

    return buf;

};

int open (const char * filename, int flags, ...)

{

    char buf[1024];

    __io_handle *ioh;

    fileinfo_t   info;

    int iomode, rwmode, offset;

    int hid;

    int err;

    hid = __io_alloc();

    if(hid < 0)

    {

        errno = EMFILE;

        __io_free(hid);

        return (-1);

    };

    if (filename[0]=='/')

    {

        strcpy(buf,filename);

    }

    else

    {

        getccwd(buf, 1024);

        buildpath(buf, filename);

    }

    err = get_fileinfo(buf, &info);

    if( flags & O_EXCL &&

        flags & O_CREAT )

    {

        if( !err )

        {

            errno = EEXIST;

            __io_free(hid);

            return (-1);

        };

    }

    if( err )

    {

        if(flags & O_CREAT)

            err=create_file(buf);

        if( err )

        {

            errno = EACCES;

            __io_free(hid);

            return -1;

        };

    };

    if( flags & O_TRUNC )

        set_file_size(buf, 0);

    ioh = &__io_tab[hid];

    rwmode = flags & ( O_RDONLY | O_WRONLY | O_RDWR );

    iomode = 0;

    offset = 0;

    if( rwmode == O_RDWR )

        iomode |= _READ | _WRITE;

    else if( rwmode == O_RDONLY)

        iomode |= _READ;

    else if( rwmode == O_WRONLY)

        iomode |= _WRITE;

    if( flags & O_APPEND )

    {

        iomode |= _APPEND;

        offset = info.size;

    };

    if( flags & (O_BINARY|O_TEXT) )

    {

        if( flags & O_BINARY )

            iomode |= _BINARY;

    } else

        iomode |= _BINARY;

    ioh->name   = strdup(buf);

    ioh->offset = offset;

    ioh->mode   = iomode;

    ioh->read   = read_file;

    ioh->write  = write_file;

    return hid;

};