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* Copyright (c) 2008 Tim Kientzle
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "lafe_platform.h"
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__FBSDID("$FreeBSD$");
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#include "line_reader.h"
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#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__BORLANDC__)
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#define strdup _strdup
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* Read lines from file and do something with each one. If option_null
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* is set, lines are terminated with zero bytes; otherwise, they're
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* terminated with newlines.
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* This uses a self-sizing buffer to handle arbitrarily-long lines.
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struct lafe_line_reader {
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char *buff, *buff_end, *line_start, *line_end, *p;
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int nullSeparator; /* Lines separated by null, not CR/CRLF/etc. */
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struct lafe_line_reader *
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lafe_line_reader(const char *pathname, int nullSeparator)
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struct lafe_line_reader *lr;
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lr = calloc(1, sizeof(*lr));
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lafe_errc(1, ENOMEM, "Can't open %s", pathname);
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lr->nullSeparator = nullSeparator;
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lr->pathname = strdup(pathname);
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if (strcmp(pathname, "-") == 0)
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lr->f = fopen(pathname, "r");
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lafe_errc(1, errno, "Couldn't open %s", pathname);
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lr->buff_length = 8192;
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lr->buff = malloc(lr->buff_length);
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lafe_errc(1, ENOMEM, "Can't read %s", pathname);
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lr->line_start = lr->line_end = lr->buff_end = lr->buff;
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lafe_line_reader_next(struct lafe_line_reader *lr)
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size_t bytes_wanted, bytes_read, new_buff_size;
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/* If there's a line in the buffer, return it immediately. */
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while (lr->line_end < lr->buff_end) {
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if (lr->nullSeparator) {
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if (*lr->line_end == '\0') {
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line_start = lr->line_start;
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lr->line_start = lr->line_end + 1;
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lr->line_end = lr->line_start;
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} else if (*lr->line_end == '\x0a' || *lr->line_end == '\x0d') {
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*lr->line_end = '\0';
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line_start = lr->line_start;
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lr->line_start = lr->line_end + 1;
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lr->line_end = lr->line_start;
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if (line_start[0] != '\0')
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/* If we're at end-of-file, process the final data. */
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/* If there's more text, return one last line. */
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if (lr->line_end > lr->line_start) {
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*lr->line_end = '\0';
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line_start = lr->line_start;
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lr->line_start = lr->line_end + 1;
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lr->line_end = lr->line_start;
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/* Otherwise, we're done. */
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/* Buffer only has part of a line. */
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if (lr->line_start > lr->buff) {
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/* Move a leftover fractional line to the beginning. */
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memmove(lr->buff, lr->line_start,
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lr->buff_end - lr->line_start);
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lr->buff_end -= lr->line_start - lr->buff;
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lr->line_end -= lr->line_start - lr->buff;
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lr->line_start = lr->buff;
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/* Line is too big; enlarge the buffer. */
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new_buff_size = lr->buff_length * 2;
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if (new_buff_size <= lr->buff_length)
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"Line too long in %s", lr->pathname);
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lr->buff_length = new_buff_size;
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p = realloc(lr->buff, new_buff_size);
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"Line too long in %s", lr->pathname);
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lr->buff_end = p + (lr->buff_end - lr->buff);
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lr->line_end = p + (lr->line_end - lr->buff);
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lr->line_start = lr->buff = p;
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/* Get some more data into the buffer. */
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bytes_wanted = lr->buff + lr->buff_length - lr->buff_end;
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bytes_read = fread(lr->buff_end, 1, bytes_wanted, lr->f);
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lr->buff_end += bytes_read;
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lafe_errc(1, errno, "Can't read %s", lr->pathname);
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lafe_line_reader_free(struct lafe_line_reader *lr)