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wernermisc/fakefile/demo.c
2012-03-29 18:42:01 -03:00

95 lines
1.7 KiB
C

/*
* demo.c - Fakefile demo
*
* Copyright 2012 by Werner Almesberger
*
* 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 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fakefile.h"
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s command [arg ...]\n"
" %s -e path errno command\n"
" %s -f path content command\n",
name, name, name);
exit(1);
}
int main(int argc, char **argv)
{
struct fakefile *ff;
struct fakefile_event *ev;
int error = 0;
const char *path = NULL, *fake = NULL;
char *end;
if (argc == 1)
usage(*argv);
if (*argv[1] == '-') {
if (argc < 5)
usage(*argv);
path = argv[2];
switch (argv[1][1]) {
case 'e':
error = strtoul(argv[3], &end, 0);
if (*end)
usage(*argv);
break;
case 'f':
fake = argv[3];
break;
default:
usage(*argv);
}
argv += 3;
}
ff = fakefile_execv(argv[1], argv+1);
while (1) {
ev = fakefile_poll();
switch (ev->type) {
case ff_et_open:
fprintf(stderr, "\"%s\"\n", ev->u.open.name);
if (path && !strcmp(ev->u.open.name, path)) {
if (!fake)
ev->u.open.res = -error;
} else {
ev->u.open.res = 0;
}
break;
case ff_et_read: {
size_t len, left;
len = ev->u.read.len;
left = strlen(fake);
if (len > left)
len = left;
ev->u.read.buf = (void *) fake;
ev->u.read.len = len;
fake += len;
break;
}
case ff_et_exit:
goto out;
default:
break;
}
fakefile_respond(ev);
}
out:
fakefile_end(ff);
return 0;
}