busybox/miscutils/ttysize.c

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/* vi: set sw=4 ts=4: */
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/*
* Replacement for "stty size", which is awkward for shell script use.
* - Allows to request width, height, or both, in any order.
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* - Does not complain on error, but returns width 80, height 24.
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* - Size: less than 200 bytes
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*
* Copyright (C) 2007 by Denys Vlasenko <vda.linux@googlemail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
//usage:#define ttysize_trivial_usage
//usage: "[w] [h]"
//usage:#define ttysize_full_usage "\n\n"
//usage: "Print dimension(s) of stdin's terminal, on error return 80x25"
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#include "libbb.h"
int ttysize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ttysize_main(int argc UNUSED_PARAM, char **argv)
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{
unsigned w, h;
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struct winsize wsz;
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w = 80;
h = 24;
if (!ioctl(0, TIOCGWINSZ, &wsz)) {
w = wsz.ws_col;
h = wsz.ws_row;
}
if (!argv[1]) {
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printf("%u %u", w, h);
} else {
const char *fmt, *arg;
fmt = "%u %u" + 3; /* "%u" */
while ((arg = *++argv) != NULL) {
char c = arg[0];
if (c == 'w')
printf(fmt, w);
if (c == 'h')
printf(fmt, h);
fmt = "%u %u" + 2; /* " %u" */
}
}
bb_putchar('\n');
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return 0;
}