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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
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