1 files changed, 111 insertions, 0 deletions
diff --git a/src/util/fullname.c b/src/util/fullname.c
new file mode 100644
index 0000000..a9d4b32
--- /dev/null
+++ b/src/util/fullname.c
@@ -0,0 +1,111 @@
+/*++
+/* NAME
+/*	fullname 3
+/* SUMMARY
+/*	lookup personal name of invoking user
+/* SYNOPSIS
+/*	#include <fullname.h>
+/*
+/*	const char *fullname()
+/* DESCRIPTION
+/*	fullname() looks up the personal name of the invoking user.
+/*	The result is volatile. Make a copy if it is to be used for
+/*	an appreciable amount of time.
+/*
+/*	On UNIX systems, fullname() first tries to use the NAME environment
+/*	variable, provided that the environment can be trusted.
+/*	If that fails, fullname() extracts the username from the GECOS
+/*	field of the user's password-file entry, replacing any occurrence
+/*	of "&" by the login name, first letter capitalized.
+/*
+/*	A null result means that no full name information was found.
+/* SEE ALSO
+/*	safe_getenv(3) safe getenv() interface
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include "vstring.h"
+#include "safe.h"
+#include "fullname.h"
+
+/* fullname - get name of user */
+
+const char *fullname(void)
+{
+    static VSTRING *result;
+    char   *cp;
+    int     ch;
+    uid_t   uid;
+    struct passwd *pwd;
+
+    if (result == 0)
+	result = vstring_alloc(10);
+
+    /*
+     * Try the environment.
+     */
+    if ((cp = safe_getenv("NAME")) != 0)
+	return (vstring_str(vstring_strcpy(result, cp)));
+
+    /*
+     * Try the password file database.
+     */
+    uid = getuid();
+    if ((pwd = getpwuid(uid)) == 0)
+	return (0);
+
+    /*
+     * Replace all `&' characters by the login name of this user, first
+     * letter capitalized. Although the full name comes from the protected
+     * password file, the actual data is specified by the user so we should
+     * not trust its sanity.
+     */
+    VSTRING_RESET(result);
+    for (cp = pwd->pw_gecos; (ch = *(unsigned char *) cp) != 0; cp++) {
+	if (ch == ',' || ch == ';' || ch == '%')
+	    break;
+	if (ch == '&') {
+	    if (pwd->pw_name[0]) {
+		VSTRING_ADDCH(result, TOUPPER(pwd->pw_name[0]));
+		vstring_strcat(result, pwd->pw_name + 1);
+	    }
+	} else {
+	    VSTRING_ADDCH(result, ch);
+	}
+    }
+    VSTRING_TERMINATE(result);
+    return (vstring_str(result));
+}
+
+#ifdef TEST
+
+#include <stdio.h>
+
+int     main(int unused_argc, char **unused_argv)
+{
+    const char *cp = fullname();
+
+    printf("%s\n", cp ? cp : "null!");
+    return (0);
+}
+
+#endif