64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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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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getdelim.cpp
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Delimited string input.
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*******************************************************************************/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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ssize_t getdelim(char** lineptr, size_t* n, int delim, FILE* fp)
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{
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if ( !lineptr || (*lineptr && !n) || !fp ) { errno = EINVAL; return -1; }
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const size_t DEFAULT_BUFSIZE = 32UL;
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int malloced = !*lineptr;
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if ( malloced ) { *lineptr = (char*) malloc(DEFAULT_BUFSIZE); }
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if ( !*lineptr ) { return -1; }
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size_t bufsize = malloced ? DEFAULT_BUFSIZE : *n;
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if ( n ) { *n = bufsize; }
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ssize_t written = 0;
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int c;
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do
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{
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if ( (c = getc(fp)) == EOF )
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{
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if ( written ) { break; } else { goto cleanup; }
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}
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if ( bufsize <= (size_t) written + 1UL )
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{
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size_t newbufsize = 2UL * bufsize;
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char* newbuf = (char*) realloc(*lineptr, newbufsize);
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if ( !newbuf ) { goto cleanup; }
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bufsize = newbufsize;
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if ( n ) { *n = bufsize; }
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*lineptr = newbuf;
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}
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(*lineptr)[written++] = c;
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} while ( c != delim );
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(*lineptr)[written] = 0;
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return written;
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cleanup:
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free(malloced ? *lineptr : NULL);
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return -1;
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}
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