c-mini-vcs/refs.c at main · BaseMax/c-mini-vcs · GitHub

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#include "mvcs.h"

/* Update a reference */
int update_ref(const char *ref, const unsigned char *hash) {
    char path[MAX_PATH_LEN];
    char hash_hex[HASH_HEX_SIZE];

    hash_to_hex(hash, hash_hex);

    if (strncmp(ref, "refs/", 5) == 0) {
        sprintf(path, ".mvcs/%s", ref);
    } else {
        sprintf(path, "%s", ref);
    }

    /* Create parent directory if needed */
    char dir[MAX_PATH_LEN];
    strcpy(dir, path);
    char *last_slash = strrchr(dir, '/');
    if (last_slash) {
        *last_slash = '\0';
        create_directory(dir);
    }

    FILE *f = fopen(path, "w");
    if (!f) return -1;

    fprintf(f, "%s\n", hash_hex);
    fclose(f);

    return 0;
}

/* Read a reference */
int read_ref(const char *ref, unsigned char *hash) {
    char path[MAX_PATH_LEN];

    if (strncmp(ref, "refs/", 5) == 0) {
        sprintf(path, ".mvcs/%s", ref);
    } else {
        sprintf(path, "%s", ref);
    }

    FILE *f = fopen(path, "r");
    if (!f) return -1;

    char hash_hex[HASH_HEX_SIZE];
    if (fgets(hash_hex, sizeof(hash_hex), f) == NULL) {
        fclose(f);
        return -1;
    }

    fclose(f);
    return hex_to_hash(hash_hex, hash);
}

/* Get current HEAD commit */
int get_head(unsigned char *hash) {
    FILE *f = fopen(HEAD_FILE, "r");
    if (!f) return -1;

    char line[256];
    if (fgets(line, sizeof(line), f) == NULL) {
        fclose(f);
        return -1;
    }
    fclose(f);

    /* Check if HEAD is symbolic ref */
    if (strncmp(line, "ref: ", 5) == 0) {
        char ref[256];
        sscanf(line + 5, "%s", ref);
        return read_ref(ref, hash);
    } else {
        /* Direct hash */
        return hex_to_hash(line, hash);
    }
}