mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-09-06 21:51:40 +00:00
Paul Eggert
0632e11574
longer worry about uses that don't define HAVE_CONFIG_H. * acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c: * basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c: * canonicalize.c, chdir-long.c, chdir-safer.c, chown.c: * cloexec.c, close-stream.c, closeout.c, creat-safer.c: * cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c: * dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c: * exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c: * file-type.c, fileblocks.c, filemode.c, filenamecat.c: * fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c: * ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c: * getcwd.c, getdate.y, getdomainname.c, getgroups.c: * gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c: * getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c: * gettime.c, gettimeofday.c, getugroups.c, getusershell.c: * glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c: * human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c: * isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c: * malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c: * memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c: * mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c: * mountlist.c, nanosleep.c, obstack.c, open-safer.c: * openat-die.c, openat.c, pagealign_alloc.c, physmem.c: * pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c: * quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c: * realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c: * same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c: * sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c: * stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c: * strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c: * timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c: * utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c: * xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c: * xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c: * xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c: Likewise.
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* linebuffer.c -- read arbitrarily long lines
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Copyright (C) 1986, 1991, 1998, 1999, 2001, 2003, 2004, 2006 Free
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Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Richard Stallman. */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "linebuffer.h"
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#include "xalloc.h"
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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#endif
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/* Initialize linebuffer LINEBUFFER for use. */
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void
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initbuffer (struct linebuffer *linebuffer)
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{
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memset (linebuffer, 0, sizeof *linebuffer);
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}
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/* Read an arbitrarily long line of text from STREAM into LINEBUFFER.
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Keep the newline; append a newline if it's the last line of a file
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that ends in a non-newline character. Do not null terminate.
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Therefore the stream can contain NUL bytes, and the length
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(including the newline) is returned in linebuffer->length.
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Return NULL when stream is empty. Return NULL and set errno upon
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error; callers can distinguish this case from the empty case by
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invoking ferror (stream).
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Otherwise, return LINEBUFFER. */
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struct linebuffer *
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readlinebuffer (struct linebuffer *linebuffer, FILE *stream)
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{
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int c;
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char *buffer = linebuffer->buffer;
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char *p = linebuffer->buffer;
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char *end = buffer + linebuffer->size; /* Sentinel. */
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if (feof (stream))
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return NULL;
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do
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{
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c = getc (stream);
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if (c == EOF)
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{
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if (p == buffer || ferror (stream))
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return NULL;
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if (p[-1] == '\n')
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break;
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c = '\n';
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}
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if (p == end)
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{
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size_t oldsize = linebuffer->size;
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buffer = x2realloc (buffer, &linebuffer->size);
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p = buffer + oldsize;
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linebuffer->buffer = buffer;
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end = buffer + linebuffer->size;
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}
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*p++ = c;
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}
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while (c != '\n');
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linebuffer->length = p - buffer;
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return linebuffer;
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}
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/* Free the buffer that was allocated for linebuffer LINEBUFFER. */
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void
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freebuffer (struct linebuffer *linebuffer)
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{
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free (linebuffer->buffer);
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}
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