| 1 | /* Buffer primitives for comparison operations.
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| 2 |
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| 3 | Copyright (C) 1993, 1995, 1998, 2001, 2002 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program; see the file COPYING.
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| 17 | If not, write to the Free Software Foundation,
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| 18 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 19 |
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| 20 | #if HAVE_CONFIG_H
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| 21 | # include <config.h>
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| 22 | #endif
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| 23 |
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| 24 | #include <errno.h>
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| 25 | #include <limits.h>
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| 26 |
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| 27 | #include <signal.h>
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| 28 | #ifndef SA_RESTART
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| 29 | # ifdef SA_INTERRUPT /* e.g. SunOS 4.1.x */
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| 30 | # define SA_RESTART SA_INTERRUPT
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| 31 | # else
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| 32 | # define SA_RESTART 0
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| 33 | # endif
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| 34 | #endif
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| 35 |
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| 36 | #if HAVE_UNISTD_H
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| 37 | # include <unistd.h>
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| 38 | #endif
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| 39 |
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| 40 | #if HAVE_INTTYPES_H
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| 41 | # include <inttypes.h>
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| 42 | #endif
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| 43 |
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| 44 | #include <sys/types.h>
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| 45 | #include "cmpbuf.h"
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| 46 |
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| 47 | /* Determine whether an integer type is signed, and its bounds.
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| 48 | This code assumes two's (or one's!) complement with no holes. */
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| 49 |
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| 50 | /* The extra casts work around common compiler bugs,
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| 51 | e.g. Cray C 5.0.3.0 when t == time_t. */
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| 52 | #ifndef TYPE_SIGNED
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| 53 | # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
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| 54 | #endif
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| 55 | #ifndef TYPE_MINIMUM
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| 56 | # define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
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| 57 | ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \
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| 58 | : (t) 0))
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| 59 | #endif
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| 60 | #ifndef TYPE_MAXIMUM
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| 61 | # define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
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| 62 | #endif
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| 63 |
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| 64 | #ifndef PTRDIFF_MAX
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| 65 | # define PTRDIFF_MAX TYPE_MAXIMUM (ptrdiff_t)
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| 66 | #endif
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| 67 | #ifndef SIZE_MAX
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| 68 | # define SIZE_MAX TYPE_MAXIMUM (size_t)
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| 69 | #endif
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| 70 | #ifndef SSIZE_MAX
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| 71 | # define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
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| 72 | #endif
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| 73 |
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| 74 | #undef MIN
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| 75 | #define MIN(a, b) ((a) <= (b) ? (a) : (b))
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| 76 |
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| 77 | /* Read NBYTES bytes from descriptor FD into BUF.
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| 78 | NBYTES must not be SIZE_MAX.
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| 79 | Return the number of characters successfully read.
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| 80 | On error, return SIZE_MAX, setting errno.
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| 81 | The number returned is always NBYTES unless end-of-file or error. */
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| 82 |
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| 83 | size_t
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