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# line.c: return the next line from a file, or NULL.
#
# Copyright (C) 1992, 2011 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
#
#include "config.h"
#define BLOCK_SIZE 40
char *
read_line (f)
FILE *f;
{
int c;
unsigned limit = BLOCK_SIZE;
unsigned loc = 0;
char *line = (char *) xmalloc (limit);
while ((c = getc (f)) != EOF && c != '\n')
{
line[loc] = c;
loc++;
/* By testing after the assignment, we guarantee that we'll always
have space for the null we append below. We know we always
have room for the first char, since we start with BLOCK_SIZE. */
if (loc == limit)
{
limit += BLOCK_SIZE;
line = (char *) xrealloc (line, limit);
}
}
/* If we read anything, return it. This can't represent a last
``line'' which doesn't end in a newline, but so what. */
if (c != EOF)
{
/* Terminate the string. We can't represent nulls in the file,
either. Again, it doesn't matter. */
line[loc] = 0;
}
else /* At end of file. */
{
free (line);
line = NULL;
}
return line;
}
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