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#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <errno.h>
#include <assert.h>
#include "cgen.h"
#include "buf.h"
#include "config/debug.h"
int main() {
char init[] = "aaaa";
char buf[] = "aaaa";
char good5[] = "b\0aa";
char good2[] = "b\0aa";
char good1[] = "\0aaa";
char good0[] = "aaaa";
char* ptr;
size_t len, old_len, i;
int ret;
ptr = buf;
old_len = len = sizeof(buf);
ret = format_buf(&ptr, &len, "b");
assert(ret == 0 && errno == 0);
assert(len == old_len - 2);
assert(ptr == buf+2);
for(i = 0; i < sizeof(buf); i++)
assert(buf[i] == good5[i]);
for(i = 0; i < sizeof(buf); i++)
buf[i] = init[i];
ptr = buf;
old_len = len = 2;
ret = format_buf(&ptr, &len, "b");
assert(ret == 0 && errno == 0);
assert(len == old_len - 2);
assert(ptr == buf+2);
for(i = 0; i < sizeof(buf); i++)
assert(buf[i] == good2[i]);
for(i = 0; i < sizeof(buf); i++)
buf[i] = init[i];
ptr = buf;
old_len = len = 1;
ret = format_buf(&ptr, &len, "b");
assert(ret == 1 && errno == ERANGE);
assert(len == old_len);
assert(ptr == buf);
for(i = 0; i < sizeof(buf); i++)
assert(buf[i] == good1[i]);
for(i = 0; i < sizeof(buf); i++)
buf[i] = init[i];
ptr = buf;
old_len = len = 0;
ret = format_buf(&ptr, &len, "b");
assert(ret == 1 && errno == ERANGE);
assert(len == old_len);
assert(ptr == buf);
for(i = 0; i < sizeof(buf); i++)
assert(buf[i] == good0[i]);
for(i = 0; i < sizeof(buf); i++)
buf[i] = init[i];
return 0;
}
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