write: get rid of function prototypes
Marking functions static and writing them in order where functions are introduced before use is enough. Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola
parent
1baec22b08
commit
b985f37240
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@ -65,14 +65,6 @@
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#include "nls.h"
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#include "xalloc.h"
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static void __attribute__ ((__noreturn__)) usage(FILE * out);
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void search_utmp(char *, char *, char *, uid_t);
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void do_write(char *, char *, uid_t);
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void wr_fputs(char *);
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static void __attribute__ ((__noreturn__)) done(int);
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int term_chk(char *, int *, time_t *, int);
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int utmp_chk(char *, char *);
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static void __attribute__ ((__noreturn__)) usage(FILE * out)
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{
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fputs(USAGE_HEADER, out);
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@ -91,6 +83,205 @@ static void __attribute__ ((__noreturn__)) usage(FILE * out)
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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/*
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* term_chk - check that a terminal exists, and get the message bit
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* and the access time
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*/
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static int term_chk(char *tty, int *msgsokP, time_t * atimeP, int showerror)
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{
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struct stat s;
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char path[PATH_MAX];
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if (strlen(tty) + 6 > sizeof(path))
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return 1;
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sprintf(path, "/dev/%s", tty);
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if (stat(path, &s) < 0) {
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if (showerror)
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warn("%s", path);
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return 1;
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}
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if (getuid() == 0) /* root can always write */
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*msgsokP = 1;
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else
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*msgsokP = (s.st_mode & S_IWGRP) && (getegid() == s.st_gid);
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*atimeP = s.st_atime;
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return 0;
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}
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/*
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* utmp_chk - checks that the given user is actually logged in on
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* the given tty
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*/
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static int utmp_chk(char *user, char *tty)
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{
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struct utmp u;
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struct utmp *uptr;
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int res = 1;
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utmpname(_PATH_UTMP);
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setutent();
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while ((uptr = getutent())) {
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memcpy(&u, uptr, sizeof(u));
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if (strncmp(user, u.ut_user, sizeof(u.ut_user)) == 0 &&
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strncmp(tty, u.ut_line, sizeof(u.ut_line)) == 0) {
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res = 0;
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break;
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}
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}
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endutent();
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return res;
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}
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/*
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* search_utmp - search utmp for the "best" terminal to write to
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*
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* Ignores terminals with messages disabled, and of the rest, returns
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* the one with the most recent access time. Returns as value the number
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* of the user's terminals with messages enabled, or -1 if the user is
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* not logged in at all.
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*
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* Special case for writing to yourself - ignore the terminal you're
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* writing from, unless that's the only terminal with messages enabled.
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*/
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static void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
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{
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struct utmp u;
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struct utmp *uptr;
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time_t bestatime, atime;
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int nloggedttys, nttys, msgsok = 0, user_is_me;
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char atty[sizeof(u.ut_line) + 1];
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utmpname(_PATH_UTMP);
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setutent();
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nloggedttys = nttys = 0;
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bestatime = 0;
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user_is_me = 0;
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while ((uptr = getutent())) {
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memcpy(&u, uptr, sizeof(u));
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if (strncmp(user, u.ut_user, sizeof(u.ut_user)) == 0) {
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++nloggedttys;
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strncpy(atty, u.ut_line, sizeof(u.ut_line));
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atty[sizeof(u.ut_line)] = '\0';
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if (term_chk(atty, &msgsok, &atime, 0))
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/* bad term? skip */
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continue;
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if (myuid && !msgsok)
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/* skip ttys with msgs off */
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continue;
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if (strcmp(atty, mytty) == 0) {
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user_is_me = 1;
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/* don't write to yourself */
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continue;
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}
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if (u.ut_type != USER_PROCESS)
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/* it's not a valid entry */
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continue;
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++nttys;
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if (atime > bestatime) {
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bestatime = atime;
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strcpy(tty, atty);
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}
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}
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}
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endutent();
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if (nloggedttys == 0)
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errx(EXIT_FAILURE, _("%s is not logged in"), user);
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if (nttys == 0) {
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if (user_is_me) {
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/* ok, so write to yourself! */
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strcpy(tty, mytty);
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return;
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}
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errx(EXIT_FAILURE, _("%s has messages disabled"), user);
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} else if (nttys > 1) {
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warnx(_("%s is logged in more than once; writing to %s"),
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user, tty);
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}
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}
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/*
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* done - cleanup and exit
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*/
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static void __attribute__ ((__noreturn__))
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done(int dummy __attribute__ ((__unused__)))
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{
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printf("EOF\r\n");
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_exit(EXIT_SUCCESS);
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}
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/*
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* wr_fputs - like fputs(), but makes control characters visible and
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* turns \n into \r\n.
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*/
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static void wr_fputs(char *s)
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{
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char c;
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#define PUTC(c) if (fputc_careful(c, stdout, '^') == EOF) \
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err(EXIT_FAILURE, _("carefulputc failed"));
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while (*s) {
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c = *s++;
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if (c == '\n')
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PUTC('\r');
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PUTC(c);
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}
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return;
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#undef PUTC
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}
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/*
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* do_write - actually make the connection
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*/
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static void do_write(char *tty, char *mytty, uid_t myuid)
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{
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char *login, *pwuid, *nows;
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struct passwd *pwd;
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time_t now;
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char path[PATH_MAX], *host, line[512];
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/* Determine our login name(s) before the we reopen() stdout */
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if ((pwd = getpwuid(myuid)) != NULL)
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pwuid = pwd->pw_name;
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else
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pwuid = "???";
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if ((login = getlogin()) == NULL)
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login = pwuid;
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if (strlen(tty) + 6 > sizeof(path))
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errx(EXIT_FAILURE, _("tty path %s too long"), tty);
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snprintf(path, sizeof(path), "/dev/%s", tty);
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if ((freopen(path, "w", stdout)) == NULL)
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err(EXIT_FAILURE, "%s", path);
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signal(SIGINT, done);
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signal(SIGHUP, done);
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/* print greeting */
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host = xgethostname();
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if (!host)
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host = xstrdup("???");
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now = time((time_t *) NULL);
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nows = ctime(&now);
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nows[16] = '\0';
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printf("\r\n\007\007\007");
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if (strcmp(login, pwuid))
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printf(_("Message from %s@%s (as %s) on %s at %s ..."),
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login, host, pwuid, mytty, nows + 11);
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else
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printf(_("Message from %s@%s on %s at %s ..."),
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login, host, mytty, nows + 11);
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free(host);
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printf("\r\n");
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while (fgets(line, sizeof(line), stdin) != NULL)
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wr_fputs(line);
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}
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int main(int argc, char **argv)
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{
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time_t atime;
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@ -182,203 +373,3 @@ int main(int argc, char **argv)
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/* NOTREACHED */
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return EXIT_FAILURE;
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}
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/*
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* utmp_chk - checks that the given user is actually logged in on
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* the given tty
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*/
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int utmp_chk(char *user, char *tty)
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{
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struct utmp u;
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struct utmp *uptr;
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int res = 1;
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utmpname(_PATH_UTMP);
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setutent();
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while ((uptr = getutent())) {
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memcpy(&u, uptr, sizeof(u));
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if (strncmp(user, u.ut_user, sizeof(u.ut_user)) == 0 &&
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strncmp(tty, u.ut_line, sizeof(u.ut_line)) == 0) {
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res = 0;
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break;
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}
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}
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endutent();
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return res;
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}
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/*
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* search_utmp - search utmp for the "best" terminal to write to
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*
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* Ignores terminals with messages disabled, and of the rest, returns
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* the one with the most recent access time. Returns as value the number
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* of the user's terminals with messages enabled, or -1 if the user is
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* not logged in at all.
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*
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* Special case for writing to yourself - ignore the terminal you're
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* writing from, unless that's the only terminal with messages enabled.
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*/
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void search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
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{
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struct utmp u;
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struct utmp *uptr;
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time_t bestatime, atime;
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int nloggedttys, nttys, msgsok = 0, user_is_me;
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char atty[sizeof(u.ut_line) + 1];
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utmpname(_PATH_UTMP);
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setutent();
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nloggedttys = nttys = 0;
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bestatime = 0;
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user_is_me = 0;
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while ((uptr = getutent())) {
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memcpy(&u, uptr, sizeof(u));
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if (strncmp(user, u.ut_user, sizeof(u.ut_user)) == 0) {
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++nloggedttys;
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strncpy(atty, u.ut_line, sizeof(u.ut_line));
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atty[sizeof(u.ut_line)] = '\0';
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if (term_chk(atty, &msgsok, &atime, 0))
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/* bad term? skip */
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continue;
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if (myuid && !msgsok)
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/* skip ttys with msgs off */
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continue;
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if (strcmp(atty, mytty) == 0) {
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user_is_me = 1;
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/* don't write to yourself */
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continue;
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}
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if (u.ut_type != USER_PROCESS)
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/* it's not a valid entry */
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continue;
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++nttys;
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if (atime > bestatime) {
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bestatime = atime;
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strcpy(tty, atty);
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}
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}
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}
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endutent();
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if (nloggedttys == 0)
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errx(EXIT_FAILURE, _("%s is not logged in"), user);
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if (nttys == 0) {
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if (user_is_me) {
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/* ok, so write to yourself! */
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strcpy(tty, mytty);
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return;
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}
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errx(EXIT_FAILURE, _("%s has messages disabled"), user);
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} else if (nttys > 1) {
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warnx(_("%s is logged in more than once; writing to %s"),
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user, tty);
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}
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}
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/*
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* term_chk - check that a terminal exists, and get the message bit
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* and the access time
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*/
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int term_chk(char *tty, int *msgsokP, time_t * atimeP, int showerror)
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{
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struct stat s;
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char path[PATH_MAX];
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if (strlen(tty) + 6 > sizeof(path))
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return 1;
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sprintf(path, "/dev/%s", tty);
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if (stat(path, &s) < 0) {
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if (showerror)
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warn("%s", path);
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return 1;
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}
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if (getuid() == 0) /* root can always write */
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*msgsokP = 1;
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else
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*msgsokP = (s.st_mode & S_IWGRP) && (getegid() == s.st_gid);
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*atimeP = s.st_atime;
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return 0;
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}
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/*
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* do_write - actually make the connection
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*/
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void do_write(char *tty, char *mytty, uid_t myuid)
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{
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char *login, *pwuid, *nows;
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struct passwd *pwd;
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time_t now;
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char path[PATH_MAX], *host, line[512];
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/* Determine our login name(s) before the we reopen() stdout */
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if ((pwd = getpwuid(myuid)) != NULL)
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pwuid = pwd->pw_name;
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else
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pwuid = "???";
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if ((login = getlogin()) == NULL)
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login = pwuid;
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if (strlen(tty) + 6 > sizeof(path))
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errx(EXIT_FAILURE, _("tty path %s too long"), tty);
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snprintf(path, sizeof(path), "/dev/%s", tty);
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if ((freopen(path, "w", stdout)) == NULL)
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err(EXIT_FAILURE, "%s", path);
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signal(SIGINT, done);
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signal(SIGHUP, done);
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/* print greeting */
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host = xgethostname();
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if (!host)
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host = xstrdup("???");
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now = time((time_t *) NULL);
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nows = ctime(&now);
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nows[16] = '\0';
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printf("\r\n\007\007\007");
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if (strcmp(login, pwuid))
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printf(_("Message from %s@%s (as %s) on %s at %s ..."),
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login, host, pwuid, mytty, nows + 11);
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else
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printf(_("Message from %s@%s on %s at %s ..."),
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login, host, mytty, nows + 11);
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free(host);
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printf("\r\n");
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while (fgets(line, sizeof(line), stdin) != NULL)
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wr_fputs(line);
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}
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/*
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* done - cleanup and exit
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*/
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static void __attribute__ ((__noreturn__))
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done(int dummy __attribute__ ((__unused__)))
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{
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printf("EOF\r\n");
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_exit(EXIT_SUCCESS);
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}
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/*
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* wr_fputs - like fputs(), but makes control characters visible and
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* turns \n into \r\n.
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*/
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void wr_fputs(char *s)
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{
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char c;
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#define PUTC(c) if (fputc_careful(c, stdout, '^') == EOF) \
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err(EXIT_FAILURE, _("carefulputc failed"));
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while (*s) {
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c = *s++;
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if (c == '\n')
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PUTC('\r');
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PUTC(c);
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}
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return;
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#undef PUTC
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}
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