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-rw-r--r--src/util/fullname.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/src/util/fullname.c b/src/util/fullname.c
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+++ b/src/util/fullname.c
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+/*++
+/* 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