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#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <tb/sha1.h>
#include <unistd.h>
static int sha1_hash_file(const char *name, int fd) {
SHA1_CTX ctx;
SHA1_Init(&ctx);
for (;;) {
char buffer[4096];
int rc = read(fd, buffer, 4096);
if (-1 == rc) {
perror("read");
return 0;
}
if (0 == rc) {
break;
}
SHA1_Update(&ctx, buffer, rc);
}
unsigned char digest[SHA1_LEN];
SHA1_Final(&ctx, digest);
printf("%s: ", name);
for (int i = 0; i < SHA1_LEN; i++) {
printf("%02x", digest[i]);
}
printf("\n");
return 1;
}
int sha1sum_main(int argc, char **argv) {
int fd = STDIN_FILENO;
// If no file operands are specified, the standard input shall be
// used.
if (argc < 2) {
return (sha1_hash_file("-", 0)) ? 0 : 1;
}
argv++;
for (; *argv; argv++) {
if (0 == strcmp(*argv, "-")) {
if (!sha1_hash_file("-", 0)) {
return 1;
}
continue;
}
if (-1 == (fd = open(*argv, O_RDONLY, 0))) {
perror(*argv);
return 1;
}
if (!sha1_hash_file(*argv, fd)) {
return 1;
}
close(fd);
}
return 0;
}
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