kolibrios/contrib/sdk/sources/newlib/libc/sys/open.c
Sergey Semyonov (Serge) 35d9f2ccf2 newlib: update
git-svn-id: svn://kolibrios.org@5215 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-12-05 18:17:47 +00:00

194 lines
3.7 KiB
C

/* 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 <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/kos_io.h>
#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;
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;
return (-1);
};
}
if( err )
{
if(flags & O_CREAT)
err=create_file(buf);
if( err )
{
errno = EACCES;
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;
};