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/**
* @file crt0.c
* Userland executable startup code
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
extern int main(int, char **);
static void stdio_init(void);
/**
* Entry point for userland programs.
* Sets up stdio, then enters the program's main() before exiting with main()'s
* return code.
*/
void _start(void)
{
stdio_init();
exit(main(0, 0));
}
/**
* Initializes file handles for stdout, stdin, and stderr.
*/
void stdio_init(void)
{
stderr = calloc(1, sizeof(FILE));
stderr->handle = 2;
stderr->buffer = malloc(BUFSIZ);
stderr->bufsize = BUFSIZ;
stderr->ungetbuf = malloc(_PDCLIB_UNGETCBUFSIZE);
stderr->status = _IOLBF | _PDCLIB_FWRITE | _PDCLIB_STATIC;
stderr->next = NULL;
stdout = calloc(1, sizeof(FILE));
stdout->handle = 1;
stdout->buffer = malloc(BUFSIZ);
stdout->bufsize = BUFSIZ;
stdout->ungetbuf = malloc(_PDCLIB_UNGETCBUFSIZE);
stdout->status = _IOLBF | _PDCLIB_FWRITE | _PDCLIB_STATIC;
stdout->next = stderr;
stdin = calloc(1, sizeof(FILE));
stdin->handle = 0;
stdin->buffer = malloc(BUFSIZ);
stdin->bufsize = BUFSIZ;
stdin->ungetbuf = malloc(_PDCLIB_UNGETCBUFSIZE);
stdin->status = _IOLBF | _PDCLIB_FREAD | _PDCLIB_STATIC;
stdin->next = stdout;
}
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