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Annotation of coherent/b/lib/libc/XSTDIO/other/getpass.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Coherent I/O Library.
        !             3:  * getpass -- get a password from the controlling
        !             4:  * terminal with echo suppressed.
        !             5:  */
        !             6: 
        !             7: #include <stdio.h>
        !             8: #include <sgtty.h>
        !             9: #include <signal.h>
        !            10: 
        !            11: #define        NPASS   50              /* Characters in a password */
        !            12: 
        !            13: static char    tty[] = "/dev/tty";
        !            14: static struct  sgttyb sg;
        !            15: static int     omode;
        !            16: static FILE    *ifp;
        !            17: static FILE    *ofp;
        !            18: static int     (*ofunc)();
        !            19: 
        !            20: char *
        !            21: getpass(pp)
        !            22: char *pp;
        !            23: {
        !            24:        static char passwd[NPASS+1];
        !            25:        char *p;
        !            26:        int   c;
        !            27:        int reset();
        !            28: 
        !            29:        if ((ofp = fopen(tty, "r+w")) != NULL)
        !            30:                ifp = ofp;
        !            31:        else {
        !            32:                ifp = stdin;
        !            33:                ofp = stderr;
        !            34:        }
        !            35:        if ((ofunc = signal(SIGINT, reset)) != SIG_IGN)
        !            36:                signal(SIGINT, reset);
        !            37:        ioctl(fileno(ofp), TIOCGETP, &sg);
        !            38:        omode = sg.sg_flags;
        !            39:        sg.sg_flags &= ~ECHO;
        !            40:        ioctl(fileno(ofp), TIOCSETP, &sg);
        !            41:        while (*pp)
        !            42:                putc(*pp++, ofp);
        !            43:        p = passwd;
        !            44:        while ((c=getc(ifp))!=EOF && c!='\n') {
        !            45:                if (p < &passwd[NPASS])
        !            46:                        *p++ = c;
        !            47:        }
        !            48:        while (p < &passwd[NPASS])
        !            49:                *p++ = '\0';
        !            50:        reset();
        !            51:        if (ifp != stdin)
        !            52:                fclose(ifp);
        !            53:        signal(SIGINT, ofunc);
        !            54:        return (c==EOF ? NULL : passwd);
        !            55: }
        !            56: 
        !            57: /*
        !            58:  * Reset echo on and signal catching.
        !            59:  */
        !            60: static
        !            61: reset()
        !            62: {
        !            63:        signal(SIGINT, ofunc);
        !            64:        sg.sg_flags = omode;
        !            65:        ioctl(fileno(ofp), TIOCSETP, &sg);
        !            66:        if (omode & ECHO)
        !            67:                putc('\n', ofp);
        !            68: }

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