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/* getfullname.c - Extract a user's name out of the GECOS field in
* the password file.
*
* This code is Copyright (c) 2012, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
extern void escape_display_name (char *, size_t);
int
main(int argc, char *argv[])
{
struct passwd *pwd;
char buf[BUFSIZ], *p;
if (argc > 2) {
fprintf (stderr, "usage: %s [name]\n", argv[0]);
return 1;
}
if (argc < 2) {
pwd = getpwuid(getuid());
if (! pwd) {
fprintf(stderr, "Unable to retrieve user info for "
"userid %ld\n", (long) getuid());
exit(1);
}
strncpy(buf, pwd->pw_gecos, sizeof(buf));
buf[sizeof(buf) - 1] = '\0';
} else
strncpy(buf, argv[1], sizeof(buf) - 1);
/*
* Perform the same processing that getuserinfo() does.
*/
/*
* Stop at the first comma.
*/
if ((p = strchr(buf, ',')))
*p = '\0';
/*
* Quote the entire string if it has a special character in it.
*/
escape_display_name (buf, sizeof(buf));
puts(buf);
exit(0);
}
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