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	readcons.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	readcons.c (1653B)
	---
	1 #include <u.h>
	2 #define NOPLAN9DEFINES
	3 #include <libc.h>
	4 #include <termios.h>
	5
	6 static int
	7 rawx(int fd, int echoing)
	8 {
	9 int was;
	10 static struct termios ttmode;
	11
	12 if(echoing == -1)
	13 return -1;
	14
	15 if(tcgetattr(fd, &ttmode) < 0)
	16 return -1;
	17 was = (ttmode.c_lflag&(ECHO\|ICANON));
	18 ttmode.c_lflag &= ~(ECHO\|ICANON);
	19 ttmode.c_lflag \|= echoing;
	20 if(tcsetattr(fd, TCSANOW, &ttmode) < 0)
	21 return -1;
	22 return was;
	23 }
	24
	25 char*
	26 readcons(char prompt, char def, int secret)
	27 {
	28 int fd, n, raw;
	29 char line[10];
	30 char s, t;
	31 int l;
	32
	33 if((fd = open("/dev/tty", ORDWR)) < 0)
	34 return nil;
	35
	36 raw = -1;
	37 if(secret){
	38 raw = rawx(fd, 0);
	39 if(raw == -1)
	40 return nil;
	41 }
	42
	43 if(def)
	44 fprint(fd, "%s[%s]: ", prompt, def);
	45 else
	46 fprint(fd, "%s: ", prompt);
	47
	48 s = strdup("");
	49 if(s == nil)
	50 return nil;
	51
	52 for(;;){
	53 n = read(fd, line, 1);
	54 if(n < 0){
	55 Error:
	56 if(secret){
	57 rawx(fd, raw);
	58 write(fd, "\n", 1);
	59 }
	60 close(fd);
	61 free(s);
	62 return nil;
	63 }
	64 if(n > 0 && line[0] == 0x7F)
	65 goto Error;
	66 if(n == 0 \|\| line[0] == 0x04 \|\| line[0] == '\n' \|\| line[…
	67 if(secret){
	68 rawx(fd, raw);
	69 write(fd, "\n", 1);
	70 }
	71 close(fd);
	72 if(*s == 0 && def){
	73 free(s);
	74 s = strdup(def);
	75 }
	76 return s;
	77 }
	78 if(line[0] == '\b'){
	79 if(strlen(s) > 0)
	80 s[strlen(s)-1] = 0;
	81 }else if(line[0] == 0x15){ /* ^U: line kill */
	82 if(def != nil)
	83 fprint(fd, "\n%s[%s]: ", prompt, def);
	84 else
	85 fprint(fd, "\n%s: ", prompt);
	86 s[0] = 0;
	87 }else{
	88 l = strlen(s);
	89 t = malloc(l+2);
	90 if(t)
	91 memmove(t, s, l);
	92 memset(s, 'X', l);
	93 free(s);
	94 if(t == nil)
	95 return nil;
	96 t[l] = line[0];
	97 t[l+1] = 0;
	98 s = t;
	99 }
	100 }
	101 }