source: MondoRescue/branches/stable/mindi-busybox/libbb/get_line_from_file.c@ 821

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
 * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
 * Copyright (C) 2001 Matt Krai
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <stdio.h>
#include <stdlib.h>
#include "libbb.h"

/* get_line_from_file() - This function reads an entire line from a text file,
 * up to a newline or NUL byte.  It returns a malloc'ed char * which must be
 * stored and free'ed  by the caller.  If end is null '\n' isn't considered
 * and of line.  If end isn't null, length of the chunk read is stored in it. */

char *bb_get_chunk_from_file(FILE * file, int *end)
{
    int ch;
    int idx = 0;
    char *linebuf = NULL;
    int linebufsz = 0;

    while ((ch = getc(file)) != EOF) {
        /* grow the line buffer as necessary */
        if (idx > linebufsz - 2) {
            linebuf = xrealloc(linebuf, linebufsz += 80);
        }
        linebuf[idx++] = (char) ch;
        if (!ch || (end && ch == '\n'))
            break;
    }
    if (end)
        *end = idx;
    if (linebuf) {
        if (ferror(file)) {
            free(linebuf);
            return NULL;
        }
        linebuf[idx] = 0;
    }
    return linebuf;
}

/* Get line, including trailing /n if any */
char *bb_get_line_from_file(FILE * file)
{
    int i;

    return bb_get_chunk_from_file(file, &i);
}

/* Get line.  Remove trailing /n */
char *bb_get_chomped_line_from_file(FILE * file)
{
    int i;
    char *c = bb_get_chunk_from_file(file, &i);

    if (i && c[--i] == '\n')
        c[i] = 0;

    return c;
}