Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.3 KB
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Rev | Line | |
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[444] | 1 | /* read for MMIXware. |
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| 2 | |
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| 3 | Copyright (C) 2001 Hans-Peter Nilsson |
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| 4 | |
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| 5 | Permission to use, copy, modify, and distribute this software is |
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| 6 | freely granted, provided that the above copyright notice, this notice |
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| 7 | and the following disclaimer are preserved with no changes. |
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| 8 | |
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| 9 | THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 10 | IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 11 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 12 | PURPOSE. */ |
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| 13 | |
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| 14 | #include <_ansi.h> |
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| 15 | #include <sys/types.h> |
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| 16 | #include <sys/stat.h> |
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| 17 | #include "sys/syscall.h" |
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| 18 | #include <errno.h> |
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| 19 | |
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| 20 | int |
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| 21 | _read (int file, |
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| 22 | char *ptr, |
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| 23 | size_t len) |
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| 24 | { |
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| 25 | long ret; |
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| 26 | |
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| 27 | if ((unsigned int) file >= 32 || _MMIX_allocated_filehandle[file] == 0) |
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| 28 | { |
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| 29 | errno = EBADF; |
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| 30 | return -1; |
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| 31 | } |
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| 32 | |
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| 33 | if (isatty(file)) |
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| 34 | { |
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| 35 | ret = TRAP3f (SYS_Fgets, file, ptr, len); |
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| 36 | |
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| 37 | if (ret == -1) |
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| 38 | return 0; |
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| 39 | |
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| 40 | return ret; |
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| 41 | } |
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| 42 | |
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| 43 | ret = TRAP3f (SYS_Fread, file, ptr, len); |
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| 44 | |
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| 45 | /* Map the return codes: |
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| 46 | -1-len: an error. We return -1. |
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| 47 | 0: success. We return len. |
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| 48 | n-len: end-of-file after n chars read. We return n. */ |
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| 49 | if (ret == 0) |
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| 50 | return len; |
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| 51 | |
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| 52 | if (ret == -1 - (long) len) |
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| 53 | { |
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| 54 | /* We don't know the nature of the failure, so this is an |
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| 55 | approximation. */ |
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| 56 | errno = EIO; |
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| 57 | return -1; |
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| 58 | } |
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| 59 | |
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| 60 | return ret + len; |
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| 61 | } |
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