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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [mmixware/] [read.c] - Rev 859
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/* read for MMIXware. Copyright (C) 2001 Hans-Peter Nilsson Permission to use, copy, modify, and distribute this software is freely granted, provided that the above copyright notice, this notice and the following disclaimer are preserved with no changes. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include <_ansi.h> #include <sys/types.h> #include <sys/stat.h> #include "sys/syscall.h" #include <errno.h> int _read (int file, char *ptr, size_t len) { long ret; if ((unsigned int) file >= 32 || _MMIX_allocated_filehandle[file] == 0) { errno = EBADF; return -1; } if (isatty(file)) { ret = TRAP3f (SYS_Fgets, file, ptr, len); if (ret == -1) return 0; return ret; } ret = TRAP3f (SYS_Fread, file, ptr, len); /* Map the return codes: -1-len: an error. We return -1. 0: success. We return len. n-len: end-of-file after n chars read. We return n. */ if (ret == 0) return len; if (ret == -1 - (long) len) { /* We don't know the nature of the failure, so this is an approximation. */ errno = EIO; return -1; } return ret + len; }
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