77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014, 2015.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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stdio/getdelim.cpp
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Delimited string input.
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*******************************************************************************/
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#include <sys/types.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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static const size_t DEFAULT_BUFSIZE = 32UL;
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extern "C" ssize_t getdelim(char** lineptr, size_t* n, int delim, FILE* fp)
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{
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int err = EINVAL;
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flockfile(fp);
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if ( !lineptr || !n )
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{
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failure:
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fp->flags |= _FILE_STATUS_ERROR;
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funlockfile(fp);
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return errno = err, -1;
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}
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err = ENOMEM;
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if ( !*lineptr )
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*n = 0;
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size_t written = 0;
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int c;
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do
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{
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if ( written == (size_t) SSIZE_MAX )
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goto failure;
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if ( *n <= (size_t) written + 1UL )
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{
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size_t newbufsize = *n ? 2UL * *n : DEFAULT_BUFSIZE;
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char* newbuf = (char*) realloc(*lineptr, newbufsize);
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if ( !newbuf )
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goto failure;
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*lineptr = newbuf;
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*n = newbufsize;
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}
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if ( (c = getc_unlocked(fp)) == EOF )
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{
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if ( !written || feof_unlocked(fp) )
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{
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funlockfile(fp);
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return -1;
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}
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}
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(*lineptr)[written++] = c;
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} while ( c != delim );
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funlockfile(fp);
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(*lineptr)[written] = 0;
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return (ssize_t) written;
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}
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