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NAME
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readcons – prompt console for input
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SYNOPSIS
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#include <u.h>
#include <libc.h>
char *readcons(char *prompt, char *def, int secret)
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DESCRIPTION
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Readcons prompts at the console for input. It returns a NUL-terminated
buffer containing the input without a final newline. The buffer
should be freed (and perhaps cleared first) when no longer needed.
If the user types an empty string (just a newline) and def is
non-zero, then a copy of def is returned instead of the empty
string.
If secret is non-zero, the input is not echoed to the screen.
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EXAMPLE
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A stripped-down version of netkey (see passwd(1)):
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pass = readcons("password", nil, 1);
passtokey(key, pass);
memset(pass, 0, strlen(pass));
free(pass);
for(;;){
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chal = readcons("challenge", nil, 0);
sprint(buf, "%d", strtol(chal, 0, 10));
free(chal);
netcrypt(key, buf);
print("response: %s0, buf);
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}
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SOURCE
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