151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
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* Copyright (c) 2012, 2013, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ioleast.h
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* Versions of {,p}{read,write} that don't return until it has returned as much
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* data as requested, end of file, or an error occurs. This is sometimes needed
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* as read(2) and write(2) is not always guaranteed to fill up the entire
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* buffer or write it all.
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*/
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#ifndef SORTIX_COMPATIBILITY_INCLUDE_IOLEAST_H
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#define SORTIX_COMPATIBILITY_INCLUDE_IOLEAST_H
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#if defined(__sortix__) || defined(__sortix_libc__)
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#include_next <ioleast.h>
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#else
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <unistd.h>
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#if !defined(EEOF) && defined(EIO)
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#define EEOF EIO
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#endif
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__attribute__((unused)) static inline
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size_t readleast(int fd, void* buf_ptr, size_t least, size_t max)
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{
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assert(least <= max);
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unsigned char* buf = (unsigned char*) buf_ptr;
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size_t done = 0;
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do
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{
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ssize_t amount = read(fd, buf + done, max - done);
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if ( amount < 0 )
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return done;
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if ( !amount && done < least )
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return errno = EEOF, done;
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if ( !amount )
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break;
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done += amount;
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} while ( done < least );
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return done;
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}
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__attribute__((unused)) static inline
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size_t writeleast(int fd, const void* buf_ptr, size_t least, size_t max)
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{
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assert(least <= max);
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const unsigned char* buf = (const unsigned char*) buf_ptr;
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size_t done = 0;
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do
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{
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ssize_t amount = write(fd, buf + done, max - done);
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if ( amount < 0 )
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return done;
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if ( !amount && done < least )
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return errno = EEOF, done;
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if ( !amount )
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break;
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done += amount;
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} while ( done < least );
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return done;
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}
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__attribute__((unused)) static inline
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size_t preadleast(int fd, void* buf_ptr, size_t least, size_t max, off_t off)
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{
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assert(least <= max);
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unsigned char* buf = (unsigned char*) buf_ptr;
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size_t done = 0;
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do
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{
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ssize_t amount = pread(fd, buf + done, max - done, off + done);
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if ( amount < 0 )
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return done;
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if ( !amount && done < least )
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return errno = EEOF, done;
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if ( !amount )
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break;
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done += amount;
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} while ( done < least );
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return done;
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}
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__attribute__((unused)) static inline
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size_t pwriteleast(int fd, const void* buf_ptr, size_t least, size_t max, off_t off)
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{
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assert(least <= max);
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const unsigned char* buf = (const unsigned char*) buf_ptr;
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size_t done = 0;
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do
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{
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ssize_t amount = pwrite(fd, buf + done, max - done, off + done);
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if ( amount < 0 )
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return done;
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if ( !amount && done < least )
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return errno = EEOF, done;
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if ( !amount )
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break;
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done += amount;
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} while ( done < least );
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return done;
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}
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__attribute__((unused)) static inline
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size_t readall(int fd, void* buf, size_t count)
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{
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return readleast(fd, buf, count, count);
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}
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__attribute__((unused)) static inline
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size_t writeall(int fd, const void* buf, size_t count)
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{
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return writeleast(fd, buf, count, count);
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}
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__attribute__((unused)) static inline
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size_t preadall(int fd, void* buf, size_t count, off_t off)
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{
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return preadleast(fd, buf, count, count, off);
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}
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__attribute__((unused)) static inline
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size_t pwriteall(int fd, const void* buf, size_t count, off_t off)
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{
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return pwriteleast(fd, buf, count, count, off);
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}
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#endif
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#endif
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