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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <err.h>
int
main(int argc, char *argv[])
{
if (argc < 3)
errx(EXIT_FAILURE, "usage: %s <u8|u16|u32|u64> number\n", argv[0]);
const struct {
const char *t;
size_t sz;
} map[] = {
{ .t = "u8", .sz = sizeof(uint8_t) },
{ .t = "u16", .sz = sizeof(uint16_t) },
{ .t = "u32", .sz = sizeof(uint32_t) },
{ .t = "u64", .sz = sizeof(uint64_t) },
};
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
size_t sz = 0;
for (size_t i = 0; i < ARRAY_SIZE(map); ++i) {
if (strcmp(argv[1], map[i].t))
continue;
sz = map[i].sz;
break;
}
if (!sz)
errx(EXIT_FAILURE, "unknown type: %s", argv[1]);
const uint64_t v = strtoll(argv[2], NULL, 10);
fwrite(&v, sz, 1, stdout);
return EXIT_SUCCESS;
}
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