diff options
Diffstat (limited to 'src/bin/misc/dec2bin.c')
-rw-r--r-- | src/bin/misc/dec2bin.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/bin/misc/dec2bin.c b/src/bin/misc/dec2bin.c new file mode 100644 index 0000000..be1dd5e --- /dev/null +++ b/src/bin/misc/dec2bin.c @@ -0,0 +1,40 @@ +#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", 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; +} |