parse command line

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

6 files changed, 441 insertions, 2 deletions

diff --git a/src/arg.h b/src/arg.h
new file mode 100644
index 0000000..8d235ba
--- /dev/null
+++ b/src/arg.h
@@ -0,0 +1,41 @@
+/*
+ * Copy me if you can.
+ * by 20h
+ */
+
+#ifndef ARG_H__
+#define ARG_H__
+
+extern char *argv0;
+
+/* use main(int argc, char *argv[]) */
+#define ARGBEGIN	for (argv0 = *argv, argv++, argc--;\
+					argv[0] && argv[0][1]\
+					&& argv[0][0] == '-';\
+					argc--, argv++) {\
+				char argc_;\
+				char **argv_;\
+				int brk_;\
+				if (argv[0][1] == '-' && argv[0][2] == '\0') {\
+					argv++;\
+					argc--;\
+					break;\
+				}\
+				for (brk_ = 0, argv[0]++, argv_ = argv;\
+						argv[0][0] && !brk_;\
+						argv[0]++) {\
+					if (argv_ != argv)\
+						break;\
+					argc_ = argv[0][0];\
+					switch (argc_)
+
+#define ARGEND			}\
+			}
+
+#define ARGF()		((argv[0][1] == '\0' && argv[1] == NULL)?\
+				(char *)0 :\
+				(brk_ = 1, (argv[0][1] != '\0')?\
+					(&argv[0][1]) :\
+					(argc--, argv++, argv[0])))
+
+#endif
diff --git a/src/blackbody.c b/src/blackbody.c
index 1e06fb9..2fb5df4 100644
--- a/src/blackbody.c
+++ b/src/blackbody.c
@@ -114,7 +114,7 @@ interpolate(double x1, double y1, double x2, double y2, double temp, double *r,
  * @throws  EDOM  The selected temperature is below 1000 K.
  */
 int
-get_colour(int fd, int temp, double *r, double *g, double *b)
+get_colour(int fd, long int temp, double *r, double *g, double *b)
 {
 	double values[10]; /* low:x,y,r,g,b + high:x,y,r,g,b */
 	off_t offset;
diff --git a/src/blackbody.h b/src/blackbody.h
index b83f641..4351505 100644
--- a/src/blackbody.h
+++ b/src/blackbody.h
@@ -35,5 +35,5 @@
  * @throws  0     The file did not have the expected size.
  * @throws  EDOM  The selected temperature is below 1000 K.
  */
-int get_colour(int fd, int temp, double *r, double *g, double *b);
+int get_colour(int fd, long int temp, double *r, double *g, double *b);
 
diff --git a/src/radharc.c b/src/radharc.c
index 5d83e1e..7b5f1e5 100644
--- a/src/radharc.c
+++ b/src/radharc.c
@@ -19,11 +19,17 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
+#include "settings.h"
+
 
 
 int
 main(int argc, char *argv[])
 {
+	struct settings settings;
+
+	parse_command_line(argc, argv, &settings);
+
 	return 0;
 }
 
diff --git a/src/settings.c b/src/settings.c
new file mode 100644
index 0000000..1eba1cc
--- /dev/null
+++ b/src/settings.c
@@ -0,0 +1,246 @@
+/**
+ * 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);
+}
+
diff --git a/src/settings.h b/src/settings.h
new file mode 100644
index 0000000..b1909bb
--- /dev/null
+++ b/src/settings.h
@@ -0,0 +1,146 @@
+/**
+ * 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 <time.h>
+
+
+
+/**
+ * Settings from the command line.
+ */
+struct settings {
+	/**
+	 * Print current status and exit?
+	 */
+	int print_status : 1;
+
+	/**
+	 * Start without transition?
+	 */
+	int panic_start : 1;
+
+	/**
+	 * Never transition, apart from at start?
+	 */
+	int panic_else : 1;
+
+	/**
+	 * Set temperature, possibly with transition, and exit?
+	 */
+	int set_and_exit : 1;
+
+	/**
+	 * Ignore calibrations?
+	 */
+	int ignore_calib : 1;
+
+	/**
+	 * Apply negative image filter?
+	 */
+	int negative : 1;
+
+	/**
+	 * Broadcast event with bus?
+	 */
+	int use_bus : 1;
+
+	/**
+	 * -1 to decrease temperature,
+	 * +1 to increase temperature,
+	 *  0 to set temperature.
+	 */
+	int temp_direction;
+
+	/**
+	 * The temperature, if use, the program will exit when it is done.
+	 */
+	long int temp;
+
+	/**
+	 * The temperature at full daytime.
+	 */
+	long int day_temp;
+
+	/**
+	 * The temperature at full night.
+	 */
+	long int night_temp;
+
+	/**
+	 * The temperature when disabled.
+	 */
+	long int natural_temp;
+
+	/**
+	 * Pathname to the hook script.
+	 */
+	char *hookpath;
+
+	/**
+	 * The number of seconds the transition takes.
+	 */
+	struct timespec transition;
+
+	/**
+	 * The number of kelvins per seconds the
+	 * temperature is adjusted during transition.
+	 */
+	long int trans_speed;
+
+	/**
+	 * The user's latitudinal position.
+	 */
+	double latitude;
+
+	/**
+	 * The user's longitudinal position.
+	 */
+	double longitude;
+
+	/**
+	 * The number of elements in `monitors_id` and in `monitors_arg`.
+	 */
+	size_t monitors_n;
+
+	/**
+	 * Values for -d, -e, and -m, in order.
+	 */
+	char **monitors_id;
+
+	/**
+	 * The option (the character after the dash)
+	 * the option used in correspnding element
+	 * in `monitors_id`.
+	 */
+	char *monitors_arg;
+};
+
+
+
+/**
+ * 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);
+