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-rw-r--r--src/settings.c246
1 files changed, 246 insertions, 0 deletions
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+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#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>
+
+
+
+/**
+ * The name of the process.
+ */
+char *argv0 = NULL;
+
+
+
+/**
+ * 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;
+
+ ARGBEGIN {
+ case 'l':
+ 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':
+ 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':
+ usage(parse_temperature(ARGF(), &(settings->natural_temp), NULL, 1000));
+ break;
+ case 's':
+ settings->trans_speed = 0;
+ usage(parse_timespec(ARGF(), &(settings->transition)));
+ break;
+ case 'S':
+ usage(parse_temperature(ARGF(), &(settings->trans_speed), NULL, 1));
+ break;
+ case 'h':
+ usage(!(settings->hookpath = 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)))
+ 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 = 1; break;
+ case 'n': settings->panic_start = 1; break;
+ case 'N': settings->panic_else = 1; break;
+ case 'o': settings->set_and_exit = 1; break;
+ case 'x': settings->ignore_calib = 1; break;
+ case 'i': settings->negative = 1; break;
+ case 'b': settings->use_bus = 1; 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);
+}
+
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