forked from KolibriOS/kolibrios
197 lines
3.8 KiB
C
197 lines
3.8 KiB
C
/* open.c -- open a file.
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*
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* Copyright (c) 1995 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/kos_io.h>
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#include "glue.h"
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#include "io.h"
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#undef erro
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extern int errno;
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static inline int is_slash(char c)
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{
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return c=='/' || c=='\\';
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}
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void fix_slashes(char * in,char * out)
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{
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int slash_count;
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for(slash_count=1;in && out && *in;in++)
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{
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if(is_slash(*in))
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{
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slash_count++;
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continue;
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}
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else
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{
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if(slash_count)
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{
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slash_count=0;
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*out++='/';
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}
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*out++=*in;
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}
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}
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*out='\0';
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};
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void buildpath(char *buf, const char* file)
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{
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char *ptr;
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ptr = buf + strlen(buf);
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while (*file)
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{
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if (file[0] == '.' && file[1] == 0)
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break;
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if (file[0] == '.' && file[1] == '/')
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{
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file+=2;
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continue;
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};
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if (file[0] == '.' && file[1] == '.' &&
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(file[2] == 0 || file[2] == '/'))
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{
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while (ptr > buf && ptr[-1] != '/')
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--ptr;
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file+=2;
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if (*file == 0)
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break;
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++file;
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continue;
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}
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*ptr++ = '/';
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if (*file == '/')
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++file;
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while (*file && *file!='/')
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*ptr++ = *file++;
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}
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*ptr = 0;
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};
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static char *getccwd(char *buf, size_t size)
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{
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int bsize;
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__asm__ __volatile__(
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"int $0x40"
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:"=a"(bsize)
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:"a"(30),"b"(2),"c"(buf), "d"(size)
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:"memory");
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return buf;
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};
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int open (const char * filename, int flags, ...)
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{
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char buf[1024];
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__io_handle *ioh;
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fileinfo_t info;
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int iomode, rwmode, offset;
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int hid;
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int err;
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hid = __io_alloc();
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if(hid < 0)
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{
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errno = EMFILE;
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__io_free(hid);
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return (-1);
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};
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if (filename[0]=='/')
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{
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strcpy(buf,filename);
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}
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else
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{
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getccwd(buf, 1024);
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buildpath(buf, filename);
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}
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err = get_fileinfo(buf, &info);
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if( flags & O_EXCL &&
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flags & O_CREAT )
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{
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if( !err )
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{
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errno = EEXIST;
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__io_free(hid);
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return (-1);
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};
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}
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if( err )
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{
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if(flags & O_CREAT)
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err=create_file(buf);
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if( err )
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{
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errno = EACCES;
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__io_free(hid);
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return -1;
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};
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};
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if( flags & O_TRUNC )
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set_file_size(buf, 0);
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ioh = &__io_tab[hid];
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rwmode = flags & ( O_RDONLY | O_WRONLY | O_RDWR );
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iomode = 0;
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offset = 0;
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if( rwmode == O_RDWR )
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iomode |= _READ | _WRITE;
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else if( rwmode == O_RDONLY)
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iomode |= _READ;
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else if( rwmode == O_WRONLY)
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iomode |= _WRITE;
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if( flags & O_APPEND )
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{
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iomode |= _APPEND;
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offset = info.size;
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};
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if( flags & (O_BINARY|O_TEXT) )
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{
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if( flags & O_BINARY )
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iomode |= _BINARY;
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} else
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iomode |= _BINARY;
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ioh->name = strdup(buf);
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ioh->offset = offset;
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ioh->mode = iomode;
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ioh->read = read_file;
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ioh->write = write_file;
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return hid;
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};
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