mirror of
https://github.com/pygos/init.git
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117 lines
2.2 KiB
C
117 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include "util.h"
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enum {
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STATE_INITIAL = 0,
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STATE_STRING = 1,
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STATE_STRING_ESC = 2,
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STATE_COMMENT = 3,
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};
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char *rdline(int fd)
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{
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size_t i = 0, bufsiz = 0, newsz;
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int ret, state = STATE_INITIAL;
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char c, *new, *buffer = NULL;
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for (;;) {
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switch (read(fd, &c, 1)) {
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case 0:
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if (i == 0) {
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errno = 0;
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return NULL;
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}
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c = '\0';
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break;
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case 1:
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if (c == '\n')
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c = '\0';
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break;
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default:
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if (errno == EINTR)
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continue;
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goto fail;
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}
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switch (state) {
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case STATE_STRING:
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if (c == '\\')
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state = STATE_STRING_ESC;
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if (c == '"')
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state = STATE_INITIAL;
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break;
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case STATE_STRING_ESC:
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state = STATE_STRING;
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break;
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case STATE_COMMENT:
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if (c != '\0')
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continue;
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break;
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default:
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if (isspace(c))
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c = ' ';
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if (c == ' ' && (i == 0 || buffer[i - 1] == ' '))
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continue;
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if (c == '#') {
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state = STATE_COMMENT;
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continue;
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}
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if (c == '"')
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state = STATE_STRING;
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break;
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}
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if (c == '\0') {
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while (i > 0 && buffer[i - 1] == ' ')
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--i;
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}
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if (i == bufsiz) {
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newsz = bufsiz ? bufsiz * 2 : 16;
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new = realloc(buffer, newsz);
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if (new == NULL)
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goto fail;
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buffer = new;
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bufsiz = newsz;
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}
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buffer[i++] = c;
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if (c == '\0')
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break;
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}
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if (state == STATE_STRING || state == STATE_STRING_ESC) {
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errno = EILSEQ;
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goto fail;
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}
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return buffer;
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fail:
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ret = errno;
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free(buffer);
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errno = ret;
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return NULL;
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}
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