programs/libc/files.c

   1 /*
   2 Copyright (C) 2008  Mathias Gottschlag
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy of
   5 this software and associated documentation files (the "Software"), to deal in the
   6 Software without restriction, including without limitation the rights to use,
   7 copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
   8 Software, and to permit persons to whom the Software is furnished to do so,
   9 subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in all
  12 copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  15 INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  17 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  18 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  19 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 */
  21
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include <dirent.h>
  27 #include <sys/stat.h>
  28 #include <sys/select.h>
  29 #include <planlos/syscalls.h>
  30
  31 int open(const char *path, int oflag, ...)
  32 {
  33         int status = -1;
  34         asm volatile("int $0x80" : "=b"(status): "a"(SYS_OPEN), "b"(path), "c"(oflag));
  35         return status;
  36 }
  37
  38 int creat(const char *path, mode_t mode)
  39 {
  40         return open(path, O_CREAT | O_TRUNC | O_WRONLY, mode);
  41 }
  42
  43 ssize_t write(int fildes, const void *buf, size_t nbyte)
  44 {
  45         int status = -1;
  46         asm volatile("int $0x80" : "=b"(status): "a"(SYS_WRITE), "b"(fildes), "c"(buf), "d"(nbyte));
  47         return status;
  48 }
  49
  50 ssize_t read(int fildes, void *buf, size_t nbyte)
  51 {
  52         int status = -1;
  53         asm volatile("int $0x80" : "=b"(status): "a"(SYS_READ), "b"(fildes), "c"(buf), "d"(nbyte));
  54         return status;
  55 }
  56
  57 int close(int fildes)
  58 {
  59         int status = -1;
  60         asm volatile("int $0x80" : "=b"(status): "a"(SYS_CLOSE), "b"(fildes));
  61         return status;
  62 }
  63
  64 off_t lseek(int fildes, off_t offset, int whence)
  65 {
  66         int position = -1;
  67         asm volatile("int $0x80" : "=b"(position): "a"(SYS_SEEK), "b"(fildes), "c"(offset), "d"(whence));
  68         return position;
  69 }
  70
  71 int mknod(const char *path, mode_t mode, dev_t dev)
  72 {
  73         int status = -1;
  74         asm volatile("int $0x80" : "=b"(status): "a"(SYS_MKNOD), "b"(path), "c"(mode));
  75         return status;
  76 }
  77 int mkdir(const char *path, mode_t mode)
  78 {
  79         return mknod(path, mode | S_IFDIR, 0);
  80 }
  81
  82 struct DIR
  83 {
  84         int fd;
  85         struct dirent dirent;
  86 };
  87
  88 #define O_DIR 0x1000
  89
  90 DIR *opendir(const char *path)
  91 {
  92         int fd = open(path, O_RDONLY | O_DIR);
  93         if (fd == -1) return 0;
  94         DIR *dir = malloc(sizeof(DIR));
  95         dir->fd = fd;
  96         return dir;
  97 }
  98 int closedir(DIR *dir)
  99 {
 100         close(dir->fd);
 101         free(dir);
 102         return 0;
 103 }
 104 struct dirent *readdir(DIR *dir)
 105 {
 106         if (!dir) return 0;
 107         if (read(dir->fd, dir->dirent.d_name, NAME_MAX + 1) <= 0) return 0;
 108         return &dir->dirent;
 109 }
 110 void rewinddir(DIR *dir)
 111 {
 112         seekdir(dir, 0);
 113 }
 114 void seekdir(DIR *dir, long index)
 115 {
 116         if (dir)
 117         {
 118                 lseek(dir->fd, index, SEEK_SET);
 119         }
 120 }
 121 long telldir(DIR *dir)
 122 {
 123         if (!dir) return -1;
 124         return lseek(dir->fd, 0, SEEK_CUR);
 125 }
 126
 127 int ioctl(int fd, int request, ...)
 128 {
 129         int param = *(&request + 1);
 130         int status;
 131         asm volatile("int $0x80" : "=b"(status): "a"(SYS_IOCTL), "b"(fd), "c"(request), "d"(param));
 132         return status;
 133 }
 134
 135 int unlink(const char *filename)
 136 {
 137         return -1;
 138 }
 139
 140 int pipe(int fd[2])
 141 {
 142         int in;
 143         int out;
 144         asm volatile("int $0x80" : "=b"(in), "=c"(out): "a"(SYS_PIPE));
 145         if (in == -1)
 146                 return -1;
 147         fd[1] = in;
 148         fd[0] = out;
 149         return 0;
 150 }
 151
 152 int fcntl(int fd, int cmd, ...)
 153 {
 154         uintptr_t param = *(uintptr_t*)(&cmd + 1);
 155         int status;
 156         asm volatile("int $0x80" : "=b"(status): "a"(SYS_FCNTL), "b"(fd), "c"(cmd), "d"(param));
 157         return status;
 158 }
 159
 160 int stat(const char *path, struct stat *buf)
 161 {
 162         return -1;
 163 }
 164
 165 void FD_CLR(int fd, fd_set *fdset)
 166 {
 167 }
 168 int FD_ISSET(int fd, fd_set *fdset)
 169 {
 170         return 0;
 171 }
 172 void FD_SET(int fd, fd_set *fdset)
 173 {
 174 }
 175 void FD_ZERO(fd_set *fdset)
 176 {
 177 }
 178
 179 /*int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds,
 180         const struct timespec *timeout, const sigset_t *sigmask)
 181 {
 182 }*/
 183 int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds,
 184         struct timeval *timeout)
 185 {
 186         return -1;
 187 }
 188
 189