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Annotation of 43BSDReno/lib/libc/gen/getpass.c, revision 1.1.1.1

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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