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Diffstat (limited to 'lib/getndelim2.c')
| -rw-r--r-- | lib/getndelim2.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/lib/getndelim2.c b/lib/getndelim2.c deleted file mode 100644 index 3c0fa3f05..000000000 --- a/lib/getndelim2.c +++ /dev/null @@ -1,155 +0,0 @@ -/* getndelim2 - Read a line from a stream, stopping at one of 2 delimiters, - with bounded memory allocation. - - Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003, 2004 Free Software - Foundation, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -/* Originally written by Jan Brittenson, bson@gnu.ai.mit.edu. */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#include "getndelim2.h" - -#include <stdlib.h> -#include <stddef.h> - -#if USE_UNLOCKED_IO -# include "unlocked-io.h" -#endif - -#include <limits.h> -#if HAVE_INTTYPES_H -# include <inttypes.h> -#endif -#if HAVE_STDINT_H -# include <stdint.h> -#endif -#ifndef PTRDIFF_MAX -# define PTRDIFF_MAX ((ptrdiff_t) (SIZE_MAX / 2)) -#endif -#ifndef SIZE_MAX -# define SIZE_MAX ((size_t) -1) -#endif -#ifndef SSIZE_MAX -# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2)) -#endif - -/* The maximum value that getndelim2 can return without suffering from - overflow problems, either internally (because of pointer - subtraction overflow) or due to the API (because of ssize_t). */ -#define GETNDELIM2_MAXIMUM (PTRDIFF_MAX < SSIZE_MAX ? PTRDIFF_MAX : SSIZE_MAX) - -/* Try to add at least this many bytes when extending the buffer. - MIN_CHUNK must be no greater than GETNDELIM2_MAXIMUM. */ -#define MIN_CHUNK 64 - -ssize_t -getndelim2 (char **lineptr, size_t *linesize, size_t offset, size_t nmax, - int delim1, int delim2, FILE *stream) -{ - size_t nbytes_avail; /* Allocated but unused bytes in *LINEPTR. */ - char *read_pos; /* Where we're reading into *LINEPTR. */ - ssize_t bytes_stored = -1; - char *ptr = *lineptr; - size_t size = *linesize; - - if (!ptr) - { - size = nmax < MIN_CHUNK ? nmax : MIN_CHUNK; - ptr = malloc (size); - if (!ptr) - return -1; - } - - if (size < offset) - goto done; - - nbytes_avail = size - offset; - read_pos = ptr + offset; - - if (nbytes_avail == 0 && nmax <= size) - goto done; - - for (;;) - { - /* Here always ptr + size == read_pos + nbytes_avail. */ - - int c; - - /* We always want at least one byte left in the buffer, since we - always (unless we get an error while reading the first byte) - NUL-terminate the line buffer. */ - - if (nbytes_avail < 2 && size < nmax) - { - size_t newsize = size < MIN_CHUNK ? size + MIN_CHUNK : 2 * size; - char *newptr; - - if (! (size < newsize && newsize <= nmax)) - newsize = nmax; - - if (GETNDELIM2_MAXIMUM < newsize - offset) - { - size_t newsizemax = offset + GETNDELIM2_MAXIMUM + 1; - if (size == newsizemax) - goto done; - newsize = newsizemax; - } - - nbytes_avail = newsize - (read_pos - ptr); - newptr = realloc (ptr, newsize); - if (!newptr) - goto done; - ptr = newptr; - size = newsize; - read_pos = size - nbytes_avail + ptr; - } - - c = getc (stream); - if (c == EOF) - { - /* Return partial line, if any. */ - if (read_pos == ptr) - goto done; - else - break; - } - - if (nbytes_avail >= 2) - { - *read_pos++ = c; - nbytes_avail--; - } - - if (c == delim1 || c == delim2) - /* Return the line. */ - break; - } - - /* Done - NUL terminate and return the number of bytes read. - At this point we know that nbytes_avail >= 1. */ - *read_pos = '\0'; - - bytes_stored = read_pos - (ptr + offset); - - done: - *lineptr = ptr; - *linesize = size; - return bytes_stored; -} |