| /* Machine-independent I/O routines for gcov. |
| |
| Copyright (c) 2000 Red Hat, Inc. All rights reserved. |
| |
| This copyrighted material is made available to anyone wishing to use, modify, |
| copy, or redistribute it subject to the terms and conditions of the BSD |
| License. This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY expressed or implied, including the implied |
| warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of |
| this license is available at http://www.opensource.org/licenses. Any Red Hat |
| trademarks that are incorporated in the source code or documentation are not |
| subject to the BSD License and may only be used or replicated with the |
| express permission of Red Hat, Inc. |
| */ |
| |
| |
| #ifndef GCC_GCOV_IO_H |
| #define GCC_GCOV_IO_H |
| #include <stdio.h> |
| #include <sys/types.h> |
| |
| static int __fetch_long (long *, char *, size_t); |
| static int __store_long (long, char *, size_t); |
| static int __read_long (long *, FILE *, size_t); |
| static int __write_long (long, FILE *, size_t); |
| |
| /* These routines only work for signed values. */ |
| |
| /* Store a portable representation of VALUE in DEST using BYTES*8-1 bits. |
| Return a non-zero value if VALUE requires more than BYTES*8-1 bits |
| to store. */ |
| |
| static int |
| __store_long (value, dest, bytes) |
| long value; |
| char *dest; |
| size_t bytes; |
| { |
| int upper_bit = (value < 0 ? 128 : 0); |
| size_t i; |
| |
| if (value < 0) |
| { |
| long oldvalue = value; |
| value = -value; |
| if (oldvalue != -value) |
| return 1; |
| } |
| |
| for(i = 0 ; i < (sizeof (value) < bytes ? sizeof (value) : bytes) ; i++) { |
| dest[i] = value & (i == (bytes - 1) ? 127 : 255); |
| value = value / 256; |
| } |
| |
| if (value && value != -1) |
| return 1; |
| |
| for(; i < bytes ; i++) |
| dest[i] = 0; |
| dest[bytes - 1] |= upper_bit; |
| return 0; |
| } |
| |
| /* Retrieve a quantity containing BYTES*8-1 bits from SOURCE and store |
| the result in DEST. Returns a non-zero value if the value in SOURCE |
| will not fit in DEST. */ |
| |
| static int |
| __fetch_long (dest, source, bytes) |
| long *dest; |
| char *source; |
| size_t bytes; |
| { |
| long value = 0; |
| int i; |
| |
| for (i = bytes - 1; (size_t) i > (sizeof (*dest) - 1); i--) |
| if (source[i] & ((size_t) i == (bytes - 1) ? 127 : 255 )) |
| return 1; |
| |
| for (; i >= 0; i--) |
| value = value * 256 + (source[i] & ((size_t)i == (bytes - 1) ? 127 : 255)); |
| |
| if ((source[bytes - 1] & 128) && (value > 0)) |
| value = - value; |
| |
| *dest = value; |
| return 0; |
| } |
| |
| /* Write a BYTES*8-bit quantity to FILE, portably. Returns a non-zero |
| value if the write fails, or if VALUE can't be stored in BYTES*8 |
| bits. |
| |
| Note that VALUE may not actually be large enough to hold BYTES*8 |
| bits, but BYTES characters will be written anyway. |
| |
| BYTES may be a maximum of 10. */ |
| |
| static int |
| __write_long (value, file, bytes) |
| long value; |
| FILE *file; |
| size_t bytes; |
| { |
| char c[10]; |
| |
| if (bytes > 10 || __store_long (value, c, bytes)) |
| return 1; |
| else |
| return fwrite(c, 1, bytes, file) != bytes; |
| } |
| |
| /* Read a quantity containing BYTES bytes from FILE, portably. Return |
| a non-zero value if the read fails or if the value will not fit |
| in DEST. |
| |
| Note that DEST may not be large enough to hold all of the requested |
| data, but the function will read BYTES characters anyway. |
| |
| BYTES may be a maximum of 10. */ |
| |
| static int |
| __read_long (dest, file, bytes) |
| long *dest; |
| FILE *file; |
| size_t bytes; |
| { |
| char c[10]; |
| |
| if (bytes > 10 || fread(c, 1, bytes, file) != bytes) |
| return 1; |
| else |
| return __fetch_long (dest, c, bytes); |
| } |
| |
| #endif /* ! GCC_GCOV_IO_H */ |