Provide compat getprogname() implementations on other OS's

 * And use them in our replacement err() and p11_kit_set_progname()

2 files changed, 71 insertions, 26 deletions

diff --git a/common/compat.c b/common/compat.c
index 93ba77c..4c8016b 100644
--- a/common/compat.c
+++ b/common/compat.c
@@ -36,40 +36,81 @@
 
 #include "compat.h"
 
-#ifndef HAVE_ERR_H
+#ifndef HAVE_GETPROGNAME
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdarg.h>
+#ifdef OS_UNIX
+
+#if defined (HAVE_PROGRAM_INVOCATION_SHORT_NAME) && !HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
+extern char *program_invocation_short_name;
+#endif
 
-static const char *
-calc_prog_name (void)
+#if defined (HAVE___PROGNAME) && !HAVE_DECL___PROGNAME
+extern char *__progname;
+#endif
+
+const char *
+getprogname (void)
 {
-	static char prognamebuf[256];
-	static int prepared = 0;
+	const char *name;
 
-	if(!prepared)
-	{
-		const char* beg = strrchr(__argv[0], '\\');
-		const char* temp = strrchr(__argv[0], '/');
-		beg = (beg > temp) ? beg : temp;
-		beg = (beg) ? beg + 1 : __argv[0];
+#if defined (HAVE_GETEXECNAME)
+	const char *p;
+	name = getexecname();
+	p = strrchr (name ? name : "", '/');
+	if (p != NULL)
+		name = p + 1;
+#elif defined (HAVE_PROGRAM_INVOCATION_SHORT_NAME)
+	name = program_invocation_short_name;
+#elif defined (HAVE___PROGNAME)
+	name = __progname;
+#else
+	#error No way to retrieve short program name
+#endif
+
+	return name;
+}
 
-		temp = strrchr(__argv[0], '.');
-		temp = (temp > beg) ? temp : __argv[0] + strlen(__argv[0]);
+#else /* OS_WIN32 */
 
-		if((temp - beg) > 255)
-			temp = beg + 255;
+extern char **__argv;
+static char prognamebuf[256];
 
-		strncpy(prognamebuf, beg, temp - beg);
-		prognamebuf[temp - beg] = 0;
-		prepared = 1;
-	}
+const char *
+getprogname (void)
+{
+	const char *name;
+	const char *p;
+	size_t length;
+
+	name = __argv[0];
+	if (name == NULL)
+		return NULL;
+
+	p = strrchr (name, '\\');
+	if (p != NULL)
+		name = p + 1;
+
+	length = sizeof (prognamebuf) - 1;
+	strncpy (prognamebuf, name, length);
+	prognamebuf[length] = 0;
+	length = strlen (prognamebuf);
+	if (length > 4 && _stricmp (prognamebuf + (length - 4), ".exe"))
+		prognamebuf[length - 4] = '\0';
 
 	return prognamebuf;
 }
 
+#endif /* OS_WIN32 */
+
+#endif /* HAVE_GETPROGNAME */
+
+#ifndef HAVE_ERR_H
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
 static FILE *err_file; /* file to use for error output */
 
 /*
diff --git a/common/compat.h b/common/compat.h
index 1562964..b2774f1 100644
--- a/common/compat.h
+++ b/common/compat.h
@@ -32,11 +32,15 @@
  * Author: Stef Walter <stefw@collabora.co.uk>
  */
 
-#ifndef __ERR_H__
-#define __ERR_H__
+#ifndef __COMPAT_H__
+#define __COMPAT_H__
 
 #include "config.h"
 
+#ifndef HAVE_GETPROGNAME
+const char * getprogname (void);
+#endif
+
 #ifdef HAVE_ERR_H
 #include <err.h>
 
@@ -60,4 +64,4 @@ void vwarnx (const char *fmt, va_list ap);
 
 #endif /* !HAVE_ERR_H */
 
-#endif /* __ERR_H__ */
+#endif /* __COMPAT_H__ */