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/*
* shellex - shell based launcher
* This is a small LD_PRELOAD library to work around some issues
* © 2013 Axel Wagner and contributors (see also: LICENSE)
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* We can not take this from <sys/ioctl.h>, because it would define the
* ioctl-function itself
*/
struct winsize {
unsigned short ws_row;
unsigned short ws_col;
unsigned short ws_xpixel;
unsigned short ws_ypixel;
};
int ioctl(int d, int request, char *argp) {
static int (*orig_ioctl)(int, int, char *);
if (orig_ioctl == NULL) {
orig_ioctl = dlsym(RTLD_NEXT, "ioctl");
}
/* We only care for TIOCGWINSZ ioctls */
if (request != 0x5413) {
return orig_ioctl(d, request, argp);
}
static int max_rows = -1;
/* ioctl gets called once before the perl module had the time to determine
* the right size! Leave max_rows negative to indicat that it still needs to
* be read from the SHELLEX_SIZE_FILE */
if (max_rows < 0) {
char *fname = getenv("SHELLEX_SIZE_FILE");
if (fname != NULL && fname[0] != '\0') {
FILE *stream = fopen(fname, "r");
char str[5] = "-500";
if (stream != NULL) {
char *ret = fgets(str, 5, stream);
fclose(stream);
if (ret != NULL) {
/* this may be -500 */
max_rows = atoi(str);
if (max_rows > 0) {
unlink(fname);
}
}
}
}
}
int retval = orig_ioctl(d, request, (char *)argp);
struct winsize *ws = (struct winsize *)argp;
/* max_rows is still negative at first invocation */
int fheight = ws->ws_ypixel / ws->ws_row;
ws->ws_row = (max_rows > 0) ? max_rows : 25;
ws->ws_ypixel = ws->ws_row * fheight;
return retval;
}
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