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Annotation of 43BSDReno/lib/libc/gen/getpass.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)getpass.c  5.7 (Berkeley) 6/17/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/termios.h>
        !            25: #include <sys/signal.h>
        !            26: #include <stdio.h>
        !            27: #include <pwd.h>
        !            28: 
        !            29: char *
        !            30: getpass(prompt)
        !            31:        char *prompt;
        !            32: {
        !            33:        struct termios term;
        !            34:        register int ch;
        !            35:        register char *p;
        !            36:        FILE *fp, *outfp;
        !            37:        long omask;
        !            38:        int echo;
        !            39:        static char buf[_PASSWORD_LEN + 1];
        !            40: 
        !            41:        /*
        !            42:         * read and write to /dev/tty if possible; else read from
        !            43:         * stdin and write to stderr.
        !            44:         */
        !            45:        if ((outfp = fp = fopen("/dev/tty", "w+")) == NULL) {
        !            46:                outfp = stderr;
        !            47:                fp = stdin;
        !            48:        }
        !            49:        /*
        !            50:         * note - blocking signals isn't necessarily the
        !            51:         * right thing, but we leave it for now.
        !            52:         */
        !            53:        omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP));
        !            54:        (void)tcgetattr(fileno(fp), &term);
        !            55:        if (echo = (term.c_lflag & ECHO)) {
        !            56:                term.c_lflag &= ~ECHO;
        !            57:                term.c_cflag |= CIGNORE;
        !            58:                (void)tcsetattr(fileno(fp), TCSAFLUSH, &term);
        !            59:        }
        !            60:        (void)fputs(prompt, outfp);
        !            61:        rewind(outfp);                  /* implied flush */
        !            62:        for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
        !            63:                if (p < buf + _PASSWORD_LEN)
        !            64:                        *p++ = ch;
        !            65:        *p = '\0';
        !            66:        (void)write(fileno(outfp), "\n", 1);
        !            67:        if (echo) {
        !            68:                term.c_lflag |= ECHO;
        !            69:                term.c_cflag |= CIGNORE;
        !            70:                tcsetattr(fileno(fp), TCSAFLUSH, &term);
        !            71:        }
        !            72:        (void)sigsetmask(omask);
        !            73:        if (fp != stdin)
        !            74:                (void)fclose(fp);
        !            75:        return(buf);
        !            76: }

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