169 lines
5 KiB
C
169 lines
5 KiB
C
/*-
|
|
* Copyright (c) 2008 Tim Kientzle
|
|
* Copyright (c) 2010 Joerg Sonnenberger
|
|
* All rights reserved.
|
|
*
|
|
* 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
|
|
* in this position and unchanged.
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "lafe_platform.h"
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "err.h"
|
|
#include "line_reader.h"
|
|
|
|
#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__BORLANDC__)
|
|
#define strdup _strdup
|
|
#endif
|
|
|
|
/*
|
|
* Read lines from file and do something with each one. If option_null
|
|
* is set, lines are terminated with zero bytes; otherwise, they're
|
|
* terminated with newlines.
|
|
*
|
|
* This uses a self-sizing buffer to handle arbitrarily-long lines.
|
|
*/
|
|
struct lafe_line_reader {
|
|
FILE *f;
|
|
char *buff, *buff_end, *line_start, *line_end, *p;
|
|
char *pathname;
|
|
size_t buff_length;
|
|
int nullSeparator; /* Lines separated by null, not CR/CRLF/etc. */
|
|
int ret;
|
|
};
|
|
|
|
struct lafe_line_reader *
|
|
lafe_line_reader(const char *pathname, int nullSeparator)
|
|
{
|
|
struct lafe_line_reader *lr;
|
|
|
|
lr = calloc(1, sizeof(*lr));
|
|
if (lr == NULL)
|
|
lafe_errc(1, ENOMEM, "Can't open %s", pathname);
|
|
|
|
lr->nullSeparator = nullSeparator;
|
|
lr->pathname = strdup(pathname);
|
|
|
|
if (strcmp(pathname, "-") == 0)
|
|
lr->f = stdin;
|
|
else
|
|
lr->f = fopen(pathname, "r");
|
|
if (lr->f == NULL)
|
|
lafe_errc(1, errno, "Couldn't open %s", pathname);
|
|
lr->buff_length = 8192;
|
|
lr->line_start = lr->line_end = lr->buff_end = lr->buff = NULL;
|
|
|
|
return (lr);
|
|
}
|
|
|
|
static void
|
|
lafe_line_reader_find_eol(struct lafe_line_reader *lr)
|
|
{
|
|
|
|
lr->line_end += strcspn(lr->line_end,
|
|
lr->nullSeparator ? "" : "\x0d\x0a");
|
|
*lr->line_end = '\0'; /* Noop if line_end == buff_end */
|
|
}
|
|
|
|
const char *
|
|
lafe_line_reader_next(struct lafe_line_reader *lr)
|
|
{
|
|
size_t bytes_wanted, bytes_read, new_buff_size;
|
|
char *line_start, *p;
|
|
|
|
for (;;) {
|
|
/* If there's a line in the buffer, return it immediately. */
|
|
while (lr->line_end < lr->buff_end) {
|
|
line_start = lr->line_start;
|
|
lr->line_start = ++lr->line_end;
|
|
lafe_line_reader_find_eol(lr);
|
|
|
|
if (lr->nullSeparator || line_start[0] != '\0')
|
|
return (line_start);
|
|
}
|
|
|
|
/* If we're at end-of-file, process the final data. */
|
|
if (lr->f == NULL) {
|
|
if (lr->line_start == lr->buff_end)
|
|
return (NULL); /* No more text */
|
|
line_start = lr->line_start;
|
|
lr->line_start = lr->buff_end;
|
|
return (line_start);
|
|
}
|
|
|
|
/* Buffer only has part of a line. */
|
|
if (lr->line_start > lr->buff) {
|
|
/* Move a leftover fractional line to the beginning. */
|
|
memmove(lr->buff, lr->line_start,
|
|
lr->buff_end - lr->line_start);
|
|
lr->buff_end -= lr->line_start - lr->buff;
|
|
lr->line_end -= lr->line_start - lr->buff;
|
|
lr->line_start = lr->buff;
|
|
} else {
|
|
/* Line is too big; enlarge the buffer. */
|
|
new_buff_size = lr->buff_length * 2;
|
|
if (new_buff_size <= lr->buff_length)
|
|
lafe_errc(1, ENOMEM,
|
|
"Line too long in %s", lr->pathname);
|
|
lr->buff_length = new_buff_size;
|
|
/*
|
|
* Allocate one extra byte to allow terminating
|
|
* the buffer.
|
|
*/
|
|
p = realloc(lr->buff, new_buff_size + 1);
|
|
if (p == NULL)
|
|
lafe_errc(1, ENOMEM,
|
|
"Line too long in %s", lr->pathname);
|
|
lr->buff_end = p + (lr->buff_end - lr->buff);
|
|
lr->line_end = p + (lr->line_end - lr->buff);
|
|
lr->line_start = lr->buff = p;
|
|
}
|
|
|
|
/* Get some more data into the buffer. */
|
|
bytes_wanted = lr->buff + lr->buff_length - lr->buff_end;
|
|
bytes_read = fread(lr->buff_end, 1, bytes_wanted, lr->f);
|
|
lr->buff_end += bytes_read;
|
|
*lr->buff_end = '\0'; /* Always terminate buffer */
|
|
lafe_line_reader_find_eol(lr);
|
|
|
|
if (ferror(lr->f))
|
|
lafe_errc(1, errno, "Can't read %s", lr->pathname);
|
|
if (feof(lr->f)) {
|
|
if (lr->f != stdin)
|
|
fclose(lr->f);
|
|
lr->f = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
lafe_line_reader_free(struct lafe_line_reader *lr)
|
|
{
|
|
free(lr->buff);
|
|
free(lr->pathname);
|
|
free(lr);
|
|
}
|