enterstr.c

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/** @file enterstr.c
    @brief Enter a string from keyboard
    @author Bill Waller
    Copyright (c) 2025
    MIT License
    billxwaller@gmail.com
    @date 2026-02-09
 */
 
#include <cm.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
 
/** @example
    @code
    USERNAME=$(enterstr "Enter your username: ")
    PASSWORD=$(enterstr "Enter your password: ")
    echo "Username: $USERNAME"
    echo "Password: $PASSWORD"
    @endcode
 */
 
/** @brief allows the user to enter a string in cooked mode
    @details allows line editing and other features
    writes the prompt to stderr and the user's input to stdout
    handles signals to ensure that the terminal settings are restored if
   the program is interrupted. */
int main(int argc, char **argv) {
    struct termios new_tioctl;
    char in_str[BUFSIZ];
    char *in_ptr = in_str;
    char *msg;
    char errmsg[128];
 
    if (argc < 2)
        strcpy(errmsg, "input:");
    else
        strcpy(errmsg, argv[1]);
    capture_shell_tioctl();
    sig_prog_mode();
    new_tioctl = shell_tioctl;
    new_tioctl.c_lflag |= ICANON;
    tcsetattr(2, TCSAFLUSH, &new_tioctl);
    while (1) {
        msg = errmsg;
        while (*msg)
            write(2, msg++, 1);
        if (read(2, in_str, BUFSIZ) > -1)
            break;
    }
    while (*in_ptr)
        write(1, in_ptr++, 1);
    sig_dfl_mode();
    restore_shell_tioctl();
    exit(0);
}