50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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* Copyright (c) 2014 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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* stdio/fparsemode.c
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* Parses the mode argument of functions like fopen().
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*/
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#include <errno.h>
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#include <stdio.h>
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int fparsemode(const char* mode)
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{
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int result;
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switch ( *mode++ )
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{
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case 'r': result = FILE_MODE_READ; break;
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case 'w': result = FILE_MODE_WRITE | FILE_MODE_CREATE | FILE_MODE_TRUNCATE; break;
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case 'a': result = FILE_MODE_WRITE | FILE_MODE_CREATE | FILE_MODE_APPEND; break;
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default: return errno = EINVAL, -1;
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};
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while ( *mode )
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{
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switch ( *mode++ )
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{
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case 'b': result |= FILE_MODE_BINARY; break;
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case 'e': result |= FILE_MODE_CLOEXEC; break;
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case 't': result &= ~FILE_MODE_BINARY; break;
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case 'x': result |= FILE_MODE_EXCL; break;
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case '+': result |= FILE_MODE_READ | FILE_MODE_WRITE; break;
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default: return errno = EINVAL, -1;
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};
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}
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return result;
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}
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