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#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#define REPO ".cvn"
#define INDEX "index"
static inline void init(int argc, char *argv[]);
static inline void status(int argc, char *argv[]);
static inline void traverse(void);
static inline uint8_t ignore(const char *path);
struct command {
char *name;
void (*func)(int argc, char *argv[]);
};
struct command cmd[] = {
{"init", init},
{"status", status},
{NULL, NULL}
};
int main(int argc, char *argv[])
{
uint8_t i;
if (argc < 2) {
fprintf(stderr, "Usage: %s <command> [<args>]\n", argv[0]);
return 1;
}
for (i = 0; cmd[i].name != NULL; i++) {
if (strcmp(argv[1], cmd[i].name) == 0) {
cmd[i].func(argc - 1, argv + 1);
return 0;
}
}
return 0;
}
static inline void init(int argc, char *argv[])
{
char *branch;
int opt, repo_fd, idx_fd;
optind = 1;
branch = "master";
while ((opt = getopt(argc, argv, "b:")) != -1) {
switch (opt) {
case 'b':
branch = optarg;
break;
default:
break;
}
}
if (mkdir(REPO, 0755) == -1) {
if (errno != EEXIST) {
perror("Failed to create repository");
return;
}
}
if ((repo_fd = open(REPO, O_RDONLY | O_DIRECTORY)) == -1) {
perror("Failed to open repository");
return;
}
if ((idx_fd = openat(repo_fd, INDEX, O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1) {
if (errno != EEXIST) {
close(repo_fd);
perror("Failed to create index");
return;
}
} else
close(idx_fd);
close(repo_fd);
printf("Initialized repository in %s\n", REPO);
}
static inline void status(int argc, char *argv[])
{
traverse();
}
static inline uint8_t ignore(const char *path)
{
return strcmp(path, ".") == 0 ||
strcmp(path, "..") == 0 ||
strcmp(path, REPO) == 0;
}
static inline void traverse(void)
{
DIR *dir;
char *path, *rel_path;
struct stat st;
struct dirent *entry;
int i, subdirs_len;
char **subdirs;
i = 0;
// On 64-bit systems: 512 * 8 (ptr size) = 4096 - typical page size / 64 cache lines
// Page-aligned buffers that fit in CPU cache lines reduce mmu overhead (play well
// with the CPU's TLB (Tranlation Lookaside Buffer).
subdirs_len = 512;
subdirs = malloc(sizeof(subdirs[0]) * subdirs_len);
if (!subdirs)
err(1, "malloc() failed");
subdirs[i++] = strdup(".");
while (i > 0) {
path = subdirs[--i];
if (!(dir = opendir(path))) {
warn("Failed to open directory %s", path);
free(path);
continue;
}
while ((entry = readdir(dir)) != NULL) {
if (ignore(entry->d_name))
continue;
if (asprintf(&rel_path, "%s/%s", path, entry->d_name) == -1)
err(1, "asprintf() failed");
if (lstat(rel_path, &st) == -1) {
warn("lstat() failed: %s", rel_path);
free(rel_path);
continue;
}
if (S_ISDIR(st.st_mode)) {
if (i >= subdirs_len) {
subdirs_len <<= 1;
subdirs = realloc(subdirs, sizeof(subdirs[0]) * subdirs_len);
if (!subdirs)
err(1, "realloc() failed");
}
subdirs[i++] = rel_path;
} else {
printf("File: %s\n", rel_path);
free(rel_path);
}
}
free(path);
closedir(dir);
}
free(subdirs);
}
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