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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include "util.h"
enum {
STATE_INITIAL = 0,
STATE_STRING = 1,
STATE_STRING_ESC = 2,
STATE_COMMENT = 3,
STATE_ARG = 4,
};
char *rdline(int fd, int argc, const char *const *argv)
{
size_t i = 0, bufsiz = 0, newsz;
int ret, state = STATE_INITIAL;
char c, *new, *buffer = NULL;
const char *argstr = NULL;
for (;;) {
if (argstr == NULL) {
switch (read(fd, &c, 1)) {
case 0:
if (i == 0) {
errno = 0;
return NULL;
}
c = '\0';
break;
case 1:
break;
default:
if (errno == EINTR)
continue;
goto fail;
}
} else {
c = *(argstr++);
if (c == '\0') {
argstr = NULL;
continue;
}
}
if (c == '\n')
c = '\0';
switch (state) {
case STATE_STRING:
if (c == '\\')
state = STATE_STRING_ESC;
if (c == '"')
state = STATE_INITIAL;
break;
case STATE_STRING_ESC:
state = STATE_STRING;
break;
case STATE_COMMENT:
if (c != '\0')
continue;
break;
case STATE_ARG:
state = STATE_INITIAL;
if (c == '%')
break;
if (!isdigit(c) || (c - '0') >= argc) {
errno = EINVAL;
goto fail;
}
if (argstr != NULL) {
errno = ELOOP;
goto fail;
}
argstr = argv[c - '0'];
continue;
default:
if (isspace(c))
c = ' ';
if (c == ' ' && (i == 0 || buffer[i - 1] == ' '))
continue;
if (c == '#') {
state = STATE_COMMENT;
continue;
}
if (c == '%') {
state = STATE_ARG;
continue;
}
if (c == '"')
state = STATE_STRING;
break;
}
if (c == '\0') {
while (i > 0 && buffer[i - 1] == ' ')
--i;
}
if (i == bufsiz) {
newsz = bufsiz ? bufsiz * 2 : 16;
new = realloc(buffer, newsz);
if (new == NULL)
goto fail;
buffer = new;
bufsiz = newsz;
}
buffer[i++] = c;
if (c == '\0')
break;
}
if (state == STATE_STRING || state == STATE_STRING_ESC) {
errno = EILSEQ;
goto fail;
}
return buffer;
fail:
ret = errno;
free(buffer);
errno = ret;
return NULL;
}
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