mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
63 lines
2 KiB
C++
63 lines
2 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
stdio/getdelim.cpp
|
|
Delimited string input.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
extern "C" ssize_t getdelim(char** lineptr, size_t* n, int delim, FILE* fp)
|
|
{
|
|
if ( !lineptr || (*lineptr && !n) || !fp ) { errno = EINVAL; return -1; }
|
|
const size_t DEFAULT_BUFSIZE = 32UL;
|
|
int malloced = !*lineptr;
|
|
if ( malloced ) { *lineptr = (char*) malloc(DEFAULT_BUFSIZE); }
|
|
if ( !*lineptr ) { return -1; }
|
|
size_t bufsize = malloced ? DEFAULT_BUFSIZE : *n;
|
|
if ( n ) { *n = bufsize; }
|
|
ssize_t written = 0;
|
|
int c;
|
|
do
|
|
{
|
|
if ( (c = getc(fp)) == EOF )
|
|
{
|
|
if ( written ) { break; } else { goto cleanup; }
|
|
}
|
|
if ( bufsize <= (size_t) written + 1UL )
|
|
{
|
|
size_t newbufsize = 2UL * bufsize;
|
|
char* newbuf = (char*) realloc(*lineptr, newbufsize);
|
|
if ( !newbuf ) { goto cleanup; }
|
|
bufsize = newbufsize;
|
|
if ( n ) { *n = bufsize; }
|
|
*lineptr = newbuf;
|
|
}
|
|
(*lineptr)[written++] = c;
|
|
} while ( c != delim );
|
|
(*lineptr)[written] = 0;
|
|
return written;
|
|
|
|
cleanup:
|
|
free(malloced ? *lineptr : NULL);
|
|
return -1;
|
|
}
|