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49 lines
973 B
Groff
49 lines
973 B
Groff
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.TH READCONS 3
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.SH NAME
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readcons \- prompt console for input
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.SH SYNOPSIS
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.B
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#include <u.h>
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.PP
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.B
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#include <libc.h>
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.PP
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.B
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char *readcons(char *prompt, char *def, int secret)
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.SH DESCRIPTION
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.I Readcons
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prompts at the console for input.
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It returns a NUL-terminated buffer containing the input
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without a final newline.
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The buffer should be freed (and perhaps cleared first)
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when no longer needed.
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.PP
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If the user types an empty string (just a newline) and
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.I def
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is non-zero, then a copy of
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.I def
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is returned instead of the empty string.
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.PP
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If
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.I secret
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is non-zero, the input is not echoed to the screen.
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.SH EXAMPLE
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A stripped-down version of
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.IR netkey (1):
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.IP
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.EX
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pass = readcons("password", nil, 1);
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passtokey(key, pass);
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memset(pass, 0, strlen(pass));
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free(pass);
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for(;;){
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chal = readcons("challenge", nil, 0);
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sprint(buf, "%d", strtol(chal, 0, 10));
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free(chal);
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netcrypt(key, buf);
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print("response: %s\n", buf);
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}
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.EE
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.SH SOURCE
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.B \*9/src/lib9/readcons.c
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