libkernaux/examples/printf_file.c

40 lines
813 B
C

#define KERNAUX_ACCESS_PROTECTED
#include <kernaux/generic/file.h>
#include <kernaux/printf.h>
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#define BUFFER_SIZE 1024
static char buffer[BUFFER_SIZE];
static size_t buffer_index = 0;
static int my_putc(__attribute__((unused)) void *const file, unsigned char c)
{
if (buffer_index >= BUFFER_SIZE) abort();
buffer[buffer_index++] = c;
return 1;
}
static const struct KernAux_File file = {
.putc = my_putc,
.puts = NULL,
.write = NULL,
};
void example_main()
{
const int result = kernaux_fprintf(
&file,
"Hello, %s! Session ID: %u.",
"Alex",
123
);
assert((size_t)result == strlen(buffer));
assert(strcmp(buffer, "Hello, Alex! Session ID: 123.") == 0);
}