From 9713aad879931bade1a3158b8414777450674e08 Mon Sep 17 00:00:00 2001
From: "Eric S. Raymond" <esr@thyrsus.com>
Date: Mon, 2 Mar 2009 23:05:21 +0000
Subject: Split up libps.c so the code overhead for users' clients will be
 lower.

---
 gpsdclient.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 gpsdclient.c

(limited to 'gpsdclient.c')

diff --git a/gpsdclient.c b/gpsdclient.c
new file mode 100644
index 00000000..5180d94c
--- /dev/null
+++ b/gpsdclient.c
@@ -0,0 +1,163 @@
+/* $Id$ */
+/* gpsclient.c -- support functions for GPSD clients */
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <math.h>
+
+#include "gpsd_config.h"
+#include "gpsd.h"
+
+#ifdef HAVE_SETLOCALE
+#include <locale.h>
+#endif
+
+/* convert double degrees to a static string and return a pointer to it
+ *
+ * deg_str_type:
+ *   	deg_dd     : return DD.dddddd
+ *      deg_ddmm   : return DD MM.mmmm'
+ *      deg_ddmmss : return DD MM' SS.sss"
+ *
+ */
+/*@observer@*/char *deg_to_str( enum deg_str_type type,  double f) 
+{
+    static char str[40];
+    int dsec, sec, deg, min;
+    long frac_deg;
+    double fdsec, fsec, fdeg, fmin;
+
+    if ( f < 0 || f > 360 ) {
+	(void)strlcpy( str, "nan", 40);
+	return str;
+    }
+
+    fmin = modf( f, &fdeg);
+    deg = (int)fdeg;
+    frac_deg = (long)(fmin * 1000000);
+
+    if ( deg_dd == type ) {
+	/* DD.dddddd */
+	(void)snprintf(str, sizeof(str), "%3d.%06ld", deg,frac_deg);
+	return str;
+    }
+    fsec = modf( fmin * 60, &fmin);
+    min = (int)fmin;
+    sec = (int)(fsec * 10000.0);
+
+    if ( deg_ddmm == type ) {
+	/* DD MM.mmmm */
+	(void)snprintf(str,sizeof(str), "%3d %02d.%04d'", deg,min,sec);
+	return str;
+    }
+    /* else DD MM SS.sss */
+    fdsec = modf( fsec * 60, &fsec);
+    sec = (int)fsec;
+    dsec = (int)(fdsec * 1000.0);
+    (void)snprintf(str,sizeof(str), "%3d %02d' %02d.%03d\"", deg,min,sec,dsec);
+
+    return str;
+}
+
+/* 
+ * check the environment to determine proper GPS units
+ *
+ * clients should only call this if no user preference is specified on 
+ * the command line or via X resources.
+ *
+ * return imperial    - Use miles/feet
+ *        nautical    - Use knots/feet
+ *        metric      - Use km/meters
+ *        unspecified - use compiled default
+ * 
+ * In order check these environment vars:
+ *    GPSD_UNITS one of: 
+ *            	imperial   = miles/feet
+ *              nautical   = knots/feet
+ *              metric     = km/meters
+ *    LC_MEASUREMENT
+ *		en_US      = miles/feet
+ *              C          = miles/feet
+ *              POSIX      = miles/feet
+ *              [other]    = km/meters
+ *    LANG
+ *		en_US      = miles/feet
+ *              C          = miles/feet
+ *              POSIX      = miles/feet
+ *              [other]    = km/meters
+ *
+ * if none found then return compiled in default
+ */
+enum unit gpsd_units(void)
+{
+	char *envu = NULL;
+
+#ifdef HAVE_SETLOCALE
+	(void)setlocale(LC_NUMERIC, "C");
+#endif
+  	if ((envu = getenv("GPSD_UNITS")) != NULL && *envu != '\0') {
+		if (0 == strcasecmp(envu, "imperial")) {
+			return imperial;
+		}
+		if (0 == strcasecmp(envu, "nautical")) {
+			return nautical;
+		}
+		if (0 == strcasecmp(envu, "metric")) {
+			return metric;
+		}
+		/* unrecognized, ignore it */
+	}
+ 	if (((envu = getenv("LC_MEASUREMENT")) != NULL && *envu != '\0') 
+ 	    || ((envu = getenv("LANG")) != NULL && *envu != '\0')) {
+		if (strcasecmp(envu, "en_US")==0 
+		    || strcasecmp(envu, "C")==0
+		    || strcasecmp(envu, "POSIX")==0) {
+			return imperial;
+		}
+		/* Other, must be metric */
+		return metric;
+	}
+	/* TODO: allow a compile time default here */
+	return unspecified;
+}
+
+/*@ -observertrans -nullpass -statictrans -mustfreeonly -kepttrans @*/
+void gpsd_source_spec(const char *arg, struct fixsource_t *source)
+/* standard parsing of a GPS data source spec */
+{
+    source->server = "127.0.0.1";
+    source->port = DEFAULT_GPSD_PORT;
+    source->device = NULL;
+
+    if (arg != NULL) {
+	char *colon1;
+	source->spec = strdup(arg);
+	colon1 = strchr(source->spec, ':');
+
+	if (colon1 != NULL) {
+	    char *colon2;
+	    *colon1 = '\0';
+	    if (colon1 != source->spec)
+		source->server = source->spec;
+	    source->port = colon1 + 1;
+	    colon2 = strchr(source->port, ':');
+	    if (colon2 != NULL) {
+		*colon2 = '\0';
+		source->device = colon2 + 1;
+	    }
+	} else if (strchr(source->spec, '/') != NULL) {
+	    source->device = source->spec;
+	} else {
+	    source->server = source->spec;
+	}
+    }
+}
+/*@ +observertrans +nullpass +statictrans +mustfreeonly +kepttrans @*/
+
+/* gpsclient.c ends here */
+
+
-- 
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