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// SPDX-FileCopyrightText: 2025 Markus Uhlin <maxxe@rpblc.net>
// SPDX-License-Identifier: ISC
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <sha1.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "copyfile.h"
#define PRINT_CHECKSUMS 0
#define SELF_TEST 0
static int
do_post_checks(const char *p1, const char *p2)
{
char buf[2][41];
char *str[2];
str[0] = &buf[0][0];
str[1] = &buf[1][0];
memset(str[0], 0, sizeof(buf[0]));
memset(str[1], 0, sizeof(buf[1]));
if (SHA1File(p1, str[0]) != NULL &&
SHA1File(p2, str[1]) != NULL) {
#if PRINT_CHECKSUMS
puts(str[0]);
puts(str[1]);
#endif
if (strcmp(str[0], str[1]) != 0) {
warnx("%s: digest mismatch", __func__);
return -1;
}
} else
warnx("%s: failed to calculate file digest", __func__);
return 0;
}
bool
fics_copyfile(const char *p1, const char *p2, const bool post_checks)
{
char tmp[2048] = { '\0' };
int fd[2];
ssize_t ret[2];
ssize_t total_read = 0;
ssize_t total_written = 0;
if (p1 == NULL || p2 == NULL ||
strcmp(p1, "") == 0 ||
strcmp(p2, "") == 0)
return false;
if (!is_regular_file(p1)) {
warnx("%s: not a regular file", __func__);
return false;
}
if ((fd[0] = open(p1, O_RDONLY)) < 0) {
warn("%s: open(%s, ...)", __func__, p1);
return false;
}
fd[1] = open(p2, (O_RDWR|O_APPEND|O_CREAT|O_TRUNC),
(S_IRUSR|S_IWUSR|S_IRGRP));
if (fd[1] < 0) {
warn("%s: open(%s, ...)", __func__, p2);
close(fd[0]);
return false;
}
while ((ret[0] = read(fd[0], tmp, sizeof tmp)) > 0) {
total_read += ret[0];
if ((ret[1] = write(fd[1], tmp, ret[0])) != ret[0]) {
warnx("%s: written mismatch read", __func__);
break;
}
total_written += ret[1];
}
if (close(fd[0]) != 0)
perror("close");
if (close(fd[1]) != 0)
perror("close");
if (total_read != total_written) {
warnx("%s: total written mismatch total read", __func__);
return false;
} else if (post_checks) {
if (do_post_checks(p1, p2) == -1)
return false;
}
return true;
}
bool
is_regular_file(const char *path)
{
struct stat sb = { 0 };
if (path == NULL || strcmp(path, "") == 0)
return false;
return (stat(path, &sb) == 0 && S_ISREG(sb.st_mode));
}
#if SELF_TEST
int
main(int argc, char *argv[])
{
if (argc != 3)
errx(1, "bogus number of args");
return (fics_copyfile(argv[1], argv[2], true) ? 0 : 1);
}
#endif
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