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cp.c
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cp.c
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/* Copyright (C) 2020 fosslinux
* This file is part of mescc-tools
*
* mescc-tools is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* mescc-tools is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with mescc-tools. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "M2libc/bootstrappable.h"
#define MAX_STRING 4096
#define MAX_ARRAY 256
/* Globals */
int verbose;
/* UTILITY FUNCTIONS */
/* Function to find a character's position in a string (last match) */
int find_last_char_pos(char* string, char a)
{
int i = strlen(string) - 1;
if(i < 0) return i;
while(i >= 0)
{
/*
* This conditional should be in the while conditional but we are
* running into the M2-Planet short-circuit bug.
*/
if(a == string[i]) break;
i = i - 1;
}
return i;
}
/* Function to find the length of a char**; an array of strings */
int array_length(char** array)
{
int length = 0;
while(array[length] != NULL)
{
length = length + 1;
}
return length;
}
/* PROCESSING FUNCTIONS */
char* directory_dest(char* dest, char* source, int require_directory)
{
/*
* First, check if it is a directory to copy to.
* We have two ways of knowing this:
* - If the destination ends in a slash, the user has explicitly said
* it is a directory.
* - Normally we would use stat() but we don't want to force support for
* that syscall onto the kernel, so we just attempt to chdir() into it
* and if it works then it must be a directory. A bit hacky, bit it
* works.
*/
int isdirectory = FALSE;
if(dest[strlen(dest) - 1] == '/')
{
isdirectory = TRUE;
}
if(!isdirectory)
{ /* Use the other testing method */
/*
* Get the current path so that we can chdir back to it if it does
* chdir successfully.
*/
char* current_path = calloc(MAX_STRING, sizeof(char));
require(current_path != NULL, "Memory initialization of current_path in directory_dest failed\n");
getcwd(current_path, MAX_STRING);
require(!match("", current_path), "getcwd() failed\n");
/*
* chdir expects an absolute path.
* If the first character is / then it is already absolute, otherwise
* it is relative and needs to be changed (by appending current_path
* to the dest path).
*/
char* chdir_dest = calloc(MAX_STRING, sizeof(char));
require(chdir_dest != NULL, "Memory initialization of chdir_dest in directory_dest failed\n");
if(dest[0] != '/')
{ /* The path is relative, append current_path */
strcat(chdir_dest, current_path);
strcat(chdir_dest, "/");
strcat(chdir_dest, dest);
}
else
{ /* The path is absolute */
strcpy(chdir_dest, dest);
}
if(0 <= chdir(chdir_dest))
{ /* chdir returned successfully */
/*
* But because of M2-Planet, that doesn't mean anything actually
* happened, check that before we go any further.
*/
char* new_path = calloc(MAX_STRING, sizeof(char));
require(new_path != NULL, "Memory initialization of new_path in directory_dest failed\n");
getcwd(new_path, MAX_STRING);
if(!match(current_path, new_path))
{
isdirectory = TRUE;
chdir(current_path);
}
}
free(chdir_dest);
free(current_path);
}
/*
* If it isn't a directory, and we require one, error out.
* Otherwise, just return what we were given, we're done here.
*/
if(require_directory) require(isdirectory, "Provide a directory destination for multiple source files\n");
if(!isdirectory) return dest;
/* If it is, we need to make dest a full path */
/* 1. Get the basename of source */
char* basename = calloc(MAX_STRING, sizeof(char));
require(basename != NULL, "Memory initialization of basename in directory_dest failed\n");
int last_slash_pos = find_last_char_pos(source, '/');
if(last_slash_pos >= 0)
{ /* Yes, there is a slash in it, copy over everything after that pos */
unsigned spos; /* source pos */
unsigned bpos = 0; /* basename pos */
/* Do the actual copy */
for(spos = last_slash_pos + 1; spos < strlen(source); spos = spos + 1)
{
basename[bpos] = source[spos];
bpos = bpos + 1;
}
}
else
{ /* No, there is no slash in it, hence the basename is just the source */
strcpy(basename, source);
}
/* 2. Ensure our dest (which is a directory) has a trailing slash */
if(dest[strlen(dest) - 1] != '/')
{
strcat(dest, "/");
}
/* 3. Add the basename to the end of the directory */
strcat(dest, basename);
free(basename);
/* Now we have a returnable path! */
return dest;
}
void copy_file(char* source, char* dest)
{
if(verbose)
{ /* Output message */
/* Of the form 'source' -> 'dest' */
fputs("'", stdout);
fputs(source, stdout);
fputs("' -> '", stdout);
fputs(dest, stdout);
fputs("'\n", stdout);
}
/* Open source and dest as FILE*s */
FILE* fsource = fopen(source, "r");
if(fsource == NULL)
{
fputs("Error opening source file ", stderr);
fputs(source, stderr);
fputc('\n', stderr);
exit(EXIT_FAILURE);
}
FILE* fdest = fopen(dest, "w");
if(fdest < 0)
{
fputs("Error opening destination file", stderr);
fputs(dest, stderr);
fputc('\n', stderr);
exit(EXIT_FAILURE);
}
/*
* The following loop reads a character from the source and writes it to the
* dest file. This is all M2-Planet supports.
*/
int c = fgetc(fsource);
while(c != EOF)
{
fputc(c, fdest);
c = fgetc(fsource);
}
/* Cleanup */
fclose(fsource);
fclose(fdest);
}
int main(int argc, char** argv)
{
/* Initialize variables */
char** sources = calloc(MAX_ARRAY, sizeof(char*));
require(sources != NULL, "Memory initialization of sources failed\n");
int sources_index = 0;
char* dest = NULL;
/* Set defaults */
verbose = FALSE;
int i = 1;
int j;
int args_found;
/* Loop arguments */
while(i <= argc)
{
if(NULL == argv[i])
{ /* Ignore and continue */
i = i + 1;
}
else if(match(argv[i], "-h") || match(argv[i], "--help"))
{
fputs("Usage: ", stdout);
fputs(argv[0], stdout);
fputs(" [-h | --help] [-V | --version] [-v | --verbose] source1 source2 sourcen destination\n", stdout);
exit(EXIT_SUCCESS);
}
else if(match(argv[i], "-V") || match(argv[i], "--version"))
{ /* Output version */
fputs("cp version 1.3.0\n", stdout);
exit(EXIT_SUCCESS);
}
else if(match(argv[i], "-v") || match(argv[i], "--verbose"))
{
verbose = TRUE;
i = i + 1;
}
else if(argv[i][0] != '-')
{ /* It is not an option */
/*
* We can tell if this is the source file or the destination file
* through looking *ahead*. If it is the last of this type of argument then
* it must be the destination. (1 destination, many sources).
*/
j = i + 1;
args_found = 0;
while(j < array_length(argv))
{
if(argv[j][0] != '-')
{ /* It's one of these type of arguments */
args_found = args_found + 1;
}
j = j + 1;
}
if(args_found == 0)
{ /* We are setting the destination (there are no more left after this) */
dest = calloc(MAX_STRING, sizeof(char));
require(dest != NULL, "Memory initialization of dest failed\n");
strcpy(dest, argv[i]);
}
else
{ /* We are setting a source */
require(sources_index < MAX_ARRAY, "Too many files\n");
sources[sources_index] = calloc(MAX_STRING, sizeof(char));
require(sources[sources_index] != NULL, "Memory initialization of sources[source_index] failed\n");
strcpy(sources[sources_index], argv[i]);
sources_index = sources_index + 1;
}
i = i + 1;
}
else
{ /* Unknown argument */
fputs("UNKNOWN_ARGUMENT\n", stderr);
exit(EXIT_FAILURE);
}
}
/* Sanitize values */
/* Ensure the two values have values */
/* Another workaround for short-circuit bug */
int error = FALSE;
if(sources[0] == NULL) error = TRUE;
if(error == FALSE) if(match(sources[0], "")) error = TRUE;
require(!error, "Provide a source file\n");
error = FALSE;
if(dest == NULL) error = TRUE;
if(error == FALSE) if(match(dest, "")) error = TRUE;
require(!error, "Provide a destination file\n");
/* Loop through all of the sources, copying each one */
char* this_dest;
for(i = 0; i < array_length(sources); i = i + 1)
{
/* Convert the dest variable to a full path if it's a directory copying to */
/*
* Also, if there is more than one source, we have to be copying to
* a directory destination...
*/
if(array_length(sources) == 1)
{
dest = directory_dest(dest, sources[i], FALSE);
copy_file(sources[i], dest);
}
else
{
this_dest = calloc(MAX_STRING, sizeof(char));
require(this_dest != NULL, "Memory initalization of this_dest failed\n");
this_dest = directory_dest(dest, sources[i], TRUE);
copy_file(sources[i], this_dest);
}
/* Perform the actual copy */
free(sources[i]);
}
free(sources);
free(dest);
return EXIT_SUCCESS;
}