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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* get_line.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "internal.h"
static void ltrim(char *buffer)
{
size_t i = 0;
while (isspace(buffer[i]))
++i;
if (i > 0)
memmove(buffer, buffer + i, strlen(buffer + i) + 1);
}
static void rtrim(char *buffer)
{
size_t i = strlen(buffer);
while (i > 0 && isspace(buffer[i - 1]))
--i;
buffer[i] = '\0';
}
static size_t trim(char *buffer, int flags)
{
if (flags & ISTREAM_LINE_LTRIM)
ltrim(buffer);
if (flags & ISTREAM_LINE_RTRIM)
rtrim(buffer);
return strlen(buffer);
}
int istream_get_line(istream_t *strm, char **out,
size_t *line_num, int flags)
{
char *line = NULL, *new;
size_t i, line_len = 0;
bool have_line = false;
*out = NULL;
for (;;) {
if (istream_precache(strm))
return -1;
if (strm->buffer_used == 0) {
if (line_len == 0)
goto out_eof;
line_len = trim(line, flags);
if (line_len == 0 &&
(flags & ISTREAM_LINE_SKIP_EMPTY)) {
goto out_eof;
}
break;
}
for (i = 0; i < strm->buffer_used; ++i) {
if (strm->buffer[i] == '\n')
break;
}
if (i < strm->buffer_used) {
have_line = true;
strm->buffer_offset = i + 1;
if (i > 0 && strm->buffer[i - 1] == '\r')
--i;
} else {
strm->buffer_offset = i;
}
new = realloc(line, line_len + i + 1);
if (new == NULL)
goto fail_errno;
line = new;
memcpy(line + line_len, strm->buffer, i);
line_len += i;
line[line_len] = '\0';
if (have_line) {
line_len = trim(line, flags);
if (line_len == 0 &&
(flags & ISTREAM_LINE_SKIP_EMPTY)) {
free(line);
line = NULL;
have_line = false;
*line_num += 1;
continue;
}
break;
}
}
*out = line;
return 0;
fail_errno:
fprintf(stderr, "%s: " PRI_SZ ": %s.\n", strm->get_filename(strm),
*line_num, strerror(errno));
free(line);
*out = NULL;
return -1;
out_eof:
free(line);
*out = NULL;
return 1;
}
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