/**
* Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "settings.h"
#include "arg.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <limits.h>
/**
* Print usage information and exit if a condition is met.
*
* @param condition Do no do anything iff this is zero.
*/
static void
usage(int condition)
{
if (condition) {
fprintf(stderr,
"Usage: %s [OPTIONS]...\n"
"See `man 1 radharc` for more information.\n",
!argv0 ? "radharc" : argv0);
exit(2);
}
}
/**
* Parse a temperature string.
*
* @param str The temperature string.
* @param temp Output parameter for the temperature.
* Overflow is truncated.
* @param direction Unless `NULL`, will be set to +1 if `str`
* starts with a '+', `-1` if `str` starts
* with a '-', 0 otherwise. If `NULL` and
* `str` starts with a '-' or a '+', the
* function will fail.
* @param lower The function shall fail if the evaluated
* temperature is below this.
* @return 0 on success, -1 on error.
*/
static int
parse_temperature(const char *str, long int *temp, int *direction, int lower)
{
int dir = 0;
char *end;
switch (*str) {
case '-': dir = -1; break;
case '+': dir = +1; break;
}
str += !!dir;
if (dir && !direction) return -1;
else if (dir) *direction = dir;
if (!isdigit(*str)) return -1;
*temp = (errno = 0, strtol)(str, &end, 10);
if ((errno && !((errno == ERANGE) && (*temp == LONG_MAX))) || *end || (*temp < lower))
return -1;
return 0;
}
/**
* Parse a string as a positively valued `struct timespec`.
*
* @param str The string.
* @param ts Output parameter for the value.
* @return 0 on success, -1 on error.
*/
static int
parse_timespec(const char *str, struct timespec *ts)
{
int points = 0;
memset(ts, 0, sizeof(*ts));
/* Parse seconds. */
if (!isdigit(*str))
return -1;
while (isdigit(*str)) {
ts->tv_sec *= 10;
ts->tv_sec += *str++ & 15;
}
/* End? */
if (!*str) return 0;
if (*str != '.') return -1;
/* Parse nanoseconds.*/
for (; (points++ < 9) && isdigit(*str); str++) {
ts->tv_nsec *= 10;
ts->tv_nsec += *str++ & 15;
}
if (points == 9) {
if (!isdigit(*str)) return -1;
if (*str++ >= '5') {
ts->tv_nsec += 1;
if (ts->tv_nsec == 1000000000L)
ts->tv_sec += 1, ts->tv_nsec = 0;
}
}
while (isdigit(*str)) str++;
if (*str) return -1;
/* End! */
return 0;
}
/**
* Parse a latitude or a longitude value.
*
* @param str The string.
* @param loc Output parameter for the value.
* @param limit The limit of the absolute value.
* @return 0 on success, -1 on error.
*/
static int
parse_location(char *str, double *loc, double limit)
{
char* end;
if (strstr(str, "−") == str) /* Support proper minus. */
*(str += strlen("−") - 1) = '-';
if ((*str != '-') && (*str != '+') && (*str != '.') && !isdigit(*str))
return -1;
*loc = (errno = 0, strtod)(str, &end);
return -(errno || *loc || (fabs(*loc) > limit));
}
/**
* Parse the command line.
*
* @param argc The number of elements in `argv`.
* @param argv The commnad line arguments including the zeroth elemenet.
* @param settings Output parameter for the settings.
*/
void
parse_command_line(int argc, char *argv[], struct settings *settings)
{
int location_set = 0;
char *p;
char *arg;
int c = 0;
memset(settings, 0, sizeof(*settings));
settings->natural_temp = 6500;
settings->day_temp = 5500;
settings->night_temp = 3500;
settings->trans_speed = 50;
#define PLUS(...) (plus ? (__VA_ARGS__) : 0)
ARGBEGIN {
case 'l':
PLUS(location_set = 0);
usage(!(p = strchr(arg = ARGF(), ':')));
*p++ = '\0', location_set = 1;
usage(parse_location(arg, &(settings->latitude), 90.0));
usage(parse_location(arg, &(settings->longitude), 180.0));
break;
case 't':
PLUS(settings->day_temp = 5500, settings->night_temp = 3500);
settings->temp = settings->day_temp = settings->night_temp = 0;
settings->temp_direction = 0;
if ((p = strchr(arg = ARGF(), ':'))) {
*p++ = '\0';
usage(parse_temperature(arg, &(settings->day_temp), NULL, 1000));
usage(parse_temperature(p, &(settings->night_temp), NULL, 1000));
} else {
usage(parse_temperature(arg, &(settings->temp), &(settings->temp_direction), 1000));
}
break;
case 'T':
PLUS(settings->natural_temp = 6500);
usage(parse_temperature(ARGF(), &(settings->natural_temp), NULL, 1000));
break;
case 's':
PLUS(settings->trans_speed = 50);
settings->trans_speed = 0;
usage(parse_timespec(ARGF(), &(settings->transition)));
break;
case 'S':
PLUS(settings->trans_speed = 0);
usage(parse_temperature(ARGF(), &(settings->trans_speed), NULL, 1));
break;
case 'h':
settings->hookpath = (plus ? NULL : ARGF());
break;
case 'd': c++; /* Fall though. */
case 'e': c++; /* Fall though. */
case 'm': c++;
#define REALLOC(VAR, N) !(VAR = realloc(VAR, (N) * sizeof(*VAR)))
PLUS(settings->monitors_n = 0, free(settings->monitors_id), free(settings->monitors_arg));
settings->monitors_n++;
if (REALLOC(settings->monitors_id, settings->monitors_n)) goto fail;
if (REALLOC(settings->monitors_arg, settings->monitors_n)) goto fail;
settings->monitors_id[settings->monitors_n - 1] = ARGF();
settings->monitors_arg[settings->monitors_n - 1] = (c == 3 ? 'm' : c == 2 ? 'e' : 'd'), c = 0;
break;
case 'p': settings->print_status = !plus; break;
case 'n': settings->panic_start = !plus; break;
case 'N': settings->panic_else = !plus; break;
case 'o': settings->set_and_exit = !plus; break;
case 'x': settings->ignore_calib = !plus; break;
case 'i': settings->negative = !plus; break;
case 'b': settings->use_bus = !plus; break;
default: usage(1); break;
} ARGEND;
usage(argc);
if (!location_set && !(settings->temp)) {
fprintf(stderr,
"%s: The -l option is mandatory, unless single value -t is used."
"See `man 1 radharc` for more information.\n",
!argv0 ? "radharc" : argv0);
exit(2);
}
fail:
perror(argv0 ? argv0 : "radharc");
exit(1);
}
/**
* Marshal settings into a buffer.
*
* @param buffer The buffer, `NULL` if you want to know the required size.
* @param settings The settings to marshal.
* @return The size of the output.
*/
size_t
marshal_settings(char *buffer, const struct settings *settings)
{
#define MARSHAL(N, DATUMP) (n += aux = (N), (buf ? (memcpy(buf, DATUMP, aux), buf += aux, 0) : 0))
size_t n = 0, i = 0;
size_t aux;
char *buf = buffer;
if (buffer) i = marshal_settings(NULL, settings);
MARSHAL(sizeof(i), &i);
MARSHAL(sizeof(*settings), settings);
if (settings->hookpath)
MARSHAL(strlen(settings->hookpath) + 1, settings->hookpath);
if (settings->monitors_arg)
MARSHAL(settings->monitors_n, settings->monitors_arg);
for (i = 0; i < settings->monitors_n; i++)
MARSHAL(strlen(settings->monitors_id[i]) + 1, settings->monitors_id[i]);
return n;
}
/**
* Unmarshal settings from a buffer.
*
* @param buffer The buffer.
* @param settings Output parameter for the settings, will be allocated.
* @return The number of unmarshalled bytes, 0 on error.
*/
size_t
unmarshal_settings(char *buffer, struct settings **settings)
{
#define UNMARSHAL(N, DATUMP) (aux = (N), memcpy((DATUMP), buf, aux), buf += aux)
size_t n, aux, i;
struct settings *s = NULL;
struct settings s_;
char *buf = buffer;
int saved_errno;
UNMARSHAL(sizeof(n), &n);
if (!(s = *settings = malloc(n - sizeof(n)))) return 0;
s->monitors_id = NULL, s->monitors_arg = NULL;
UNMARSHAL(sizeof(s_), &s_);
if (s_.monitors_n) {
if (!(*s = s_, s->monitors_id = malloc(s_.monitors_n * sizeof(char*)))) goto fail;
if (!(*s = s_, s->monitors_arg = malloc(s_.monitors_n * sizeof(char)))) goto fail;
}
s->hookpath = buf;
buf = strchr(buf, '\0') + 1;
UNMARSHAL(s_.monitors_n, s->monitors_arg);
for (i = 0; i < s_.monitors_n; i++)
UNMARSHAL(strlen(buf + 1), s->monitors_id[i]);
return n;
fail:
saved_errno = errno;
free(s->monitors_id), free(s->monitors_arg), free(s), *settings = NULL;
errno = saved_errno;
return 0;
}
