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