diff options
Diffstat (limited to 'cmd-line-utils/libedit/fgetln.c')
| -rw-r--r-- | cmd-line-utils/libedit/fgetln.c | 185 |
1 files changed, 82 insertions, 103 deletions
diff --git a/cmd-line-utils/libedit/fgetln.c b/cmd-line-utils/libedit/fgetln.c index 4f7416a4c8d..5b95b2f6584 100644 --- a/cmd-line-utils/libedit/fgetln.c +++ b/cmd-line-utils/libedit/fgetln.c @@ -1,109 +1,88 @@ +/* $NetBSD: fgetln.c,v 1.2 2003/12/10 01:30:27 lukem Exp $ */ + +/*- + * Copyright (c) 1998 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Christos Zoulas. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <config.h> #include <stdio.h> -#include "compat.h" +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> -#ifndef HAVE_FGETLN -#ifdef HAVE_GETLINE - -extern int getline (char **lineptr, size_t *n, FILE *stream); - -#else - -/* The interface here is that of GNU libc's getline */ -static int -getline (char **lineptr, size_t *n, FILE *stream) +char * +fgetln(FILE *fp, size_t *len) { -#define EXPAND_CHUNK 16 - - int n_read = 0; - char *line = *lineptr; - - if (lineptr == NULL) return -1; - if (n == NULL) return -1; - if (stream == NULL) return -1; - if (*lineptr == NULL || *n == 0) return -1; - -#ifdef HAVE_FLOCKFILE - flockfile (stream); -#endif - - while (1) - { - int c; - -#ifdef HAVE_FLOCKFILE - c = getc_unlocked (stream); -#else - c = getc (stream); -#endif - - if (c == EOF) - { - if (n_read > 0) - line[n_read] = '\0'; - break; - } - - if (n_read + 2 >= *n) - { - size_t new_size; - - if (*n == 0) - new_size = 16; - else - new_size = *n * 2; - - if (*n >= new_size) /* Overflowed size_t */ - line = NULL; - else - line = (char *) (*lineptr ? (char*) realloc(*lineptr, new_size) : - (char*) malloc(new_size)); - - if (line) - { - *lineptr = line; - *n = new_size; - } - else - { - if (*n > 0) - { - (*lineptr)[*n - 1] = '\0'; - n_read = *n - 2; - } - break; - } - } - - line[n_read] = c; - n_read++; - - if (c == '\n') - { - line[n_read] = '\0'; - break; - } - } - -#ifdef HAVE_FLOCKFILE - funlockfile (stream); -#endif - - return n_read - 1; + static char *buf = NULL; + static size_t bufsiz = 0; + char *ptr; + + + if (buf == NULL) { + bufsiz = BUFSIZ; + if ((buf = malloc(bufsiz)) == NULL) + return NULL; + } + + if (fgets(buf, bufsiz, fp) == NULL) + return NULL; + *len = 0; + + while ((ptr = strchr(&buf[*len], '\n')) == NULL) { + size_t nbufsiz = bufsiz + BUFSIZ; + char *nbuf = realloc(buf, nbufsiz); + + if (nbuf == NULL) { + int oerrno = errno; + free(buf); + errno = oerrno; + buf = NULL; + return NULL; + } else + buf = nbuf; + + *len = bufsiz; + if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) + return buf; + + bufsiz = nbufsiz; + } + + *len = (ptr - buf) + 1; + return buf; } -#endif /* ! HAVE_GETLINE */ -char *fgetln(FILE *stream, size_t *len) -{ - char *ptr = NULL; - int sz; - size_t length= 0; - - sz = getline(&ptr, &length, stream); - if(len) { - *len = sz; - } - - return sz >= 0 ? ptr : NULL; -} -#endif |