Merge "Lose chmod to toybox."

OUR_TOOLS := \

    chcon \

    chmod \

    cmp \

    date \

    df \

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <dirent.h>

#include <errno.h>

#include <sys/limits.h>

#include <sys/stat.h>

#include <unistd.h>

#include <time.h>

void recurse_chmod(char* path, int mode)

{

    struct dirent *dp;

    DIR *dir = opendir(path);

    if (dir == NULL) {

        // not a directory, carry on

        return;

    }

    char *subpath = malloc(sizeof(char)*PATH_MAX);

    int pathlen = strlen(path);

    while ((dp = readdir(dir)) != NULL) {

        if (strcmp(dp->d_name, ".") == 0 ||

            strcmp(dp->d_name, "..") == 0) continue;

        if (strlen(dp->d_name) + pathlen + 2/*NUL and slash*/ > PATH_MAX) {

            fprintf(stderr, "Invalid path specified: too long\n");

            exit(1);

        }

        strcpy(subpath, path);

        strcat(subpath, "/");

        strcat(subpath, dp->d_name);

        if (chmod(subpath, mode) < 0) {

            fprintf(stderr, "Unable to chmod %s: %s\n", subpath, strerror(errno));

            exit(1);

        }

        recurse_chmod(subpath, mode);

    }

    free(subpath);

    closedir(dir);

}

static int usage()

{

    fprintf(stderr, "Usage: chmod [OPTION] <MODE> <FILE>\n");

    fprintf(stderr, "  -R, --recursive         change files and directories recursively\n");

    fprintf(stderr, "  --help                  display this help and exit\n");

    return 10;

}

int chmod_main(int argc, char **argv)

{

    int i;

    if (argc < 3 || strcmp(argv[1], "--help") == 0) {

        return usage();

    }

    int recursive = (strcmp(argv[1], "-R") == 0 ||

                     strcmp(argv[1], "--recursive") == 0) ? 1 : 0;

    if (recursive && argc < 4) {

        return usage();

    }

    if (recursive) {

        argc--;

        argv++;

    }

    int mode = 0;

    const char* s = argv[1];

    while (*s) {

        if (*s >= '0' && *s <= '7') {

            mode = (mode<<3) | (*s-'0');

        }

        else {

            fprintf(stderr, "Bad mode\n");

            return 10;

        }

        s++;

    }

    for (i = 2; i < argc; i++) {

        if (chmod(argv[i], mode) < 0) {

            fprintf(stderr, "Unable to chmod %s: %s\n", argv[i], strerror(errno));

            return 10;

        }

        if (recursive) {

            recurse_chmod(argv[i], mode);

        }

    }

    return 0;

}