123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110 |
- #include <u.h>
- #include <libc.h>
- #include "drawterm.h"
- void*
- erealloc(void *v, ulong n)
- {
- v = realloc(v, n);
- if(v == nil)
- sysfatal("out of memory");
- return v;
- }
- char*
- estrdup(char *s)
- {
- s = strdup(s);
- if(s == nil)
- sysfatal("out of memory");
- return s;
- }
- char*
- estrappend(char *s, char *fmt, ...)
- {
- char *t;
- va_list arg;
- va_start(arg, fmt);
- t = vsmprint(fmt, arg);
- if(t == nil)
- sysfatal("out of memory");
- va_end(arg);
- s = erealloc(s, strlen(s)+strlen(t)+1);
- strcat(s, t);
- free(t);
- return s;
- }
- /*
- * prompt for a string with a possible default response
- */
- char*
- readcons(char *prompt, char *def, int raw)
- {
- int fdin, fdout, ctl, n;
- char line[10];
- char *s;
- fdin = open("/dev/cons", OREAD);
- if(fdin < 0)
- fdin = 0;
- fdout = open("/dev/cons", OWRITE);
- if(fdout < 0)
- fdout = 1;
- if(def != nil)
- fprint(fdout, "%s[%s]: ", prompt, def);
- else
- fprint(fdout, "%s: ", prompt);
- if(raw){
- ctl = open("/dev/consctl", OWRITE);
- if(ctl >= 0)
- write(ctl, "rawon", 5);
- } else
- ctl = -1;
- s = estrdup("");
- for(;;){
- n = read(fdin, line, 1);
- if(n == 0){
- Error:
- close(fdin);
- close(fdout);
- if(ctl >= 0)
- close(ctl);
- free(s);
- return nil;
- }
- if(n < 0)
- goto Error;
- if(line[0] == 0x7f)
- goto Error;
- if(n == 0 || line[0] == '\n' || line[0] == '\r'){
- if(raw){
- write(ctl, "rawoff", 6);
- write(fdout, "\n", 1);
- }
- close(ctl);
- close(fdin);
- close(fdout);
- if(*s == 0 && def != nil)
- s = estrappend(s, "%s", def);
- return s;
- }
- if(line[0] == '\b'){
- if(strlen(s) > 0)
- s[strlen(s)-1] = 0;
- } else if(line[0] == 0x15) { /* ^U: line kill */
- if(def != nil)
- fprint(fdout, "\n%s[%s]: ", prompt, def);
- else
- fprint(fdout, "\n%s: ", prompt);
-
- s[0] = 0;
- } else {
- s = estrappend(s, "%c", line[0]);
- }
- }
- return nil; /* not reached */
- }
|