73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* Copyright (c) 2011, 2012, 2014, 2015, 2018 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/getdelim.c
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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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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 || ferror_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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break;
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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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